Mettler Toledo GA42 Operating instructions

Operating Instructions
METTLER TOLEDO
DE40, DE50 and DE51 Density Meters
V2.00
Contents
Page
1.
Introduction ................................................................................................... 6
2.
Safety measures ............................................................................................ 7
3.
3.1
3.2
3.3
The density .................................................................................................... 8
Definition .......................................................................................................... 8
Measurement principle ..................................................................................... 8
Construction of the measuring cell and temperature control.......................... 11
4.
4.2.
4.3
The instrument ............................................................................................ 12
Keyboard ........................................................................................................ 14
Display ........................................................................................................... 17
5.
5.1
5.2
5.3
Getting started ............................................................................................. 18
Setting up the instrument ............................................................................... 18
Performing the first adjustment (calibration) .................................................. 19
Perform a measurement ................................................................................ 23
6.
6.1
Sample (Number and ID) and Sample File ................................................ 26
Sample File (sample changer) ....................................................................... 26
7.
Report (password protected) ..................................................................... 29
8.
8.1
8.2
8.3
8.4
8.5
8.6
8.7
Measuring parameter (password protected) ............................................ 30
Method name ................................................................................................. 30
Measuring temperature .................................................................................. 31
Measurement stability .................................................................................... 31
Limit time ........................................................................................................ 32
Sequence (sampling, drain, rinse, purge) ...................................................... 32
Adjustment mode (Calibration selection) ....................................................... 34
Explanation of auto-sampling and auto-draining ............................................ 35
9.
9.1
9.2
9.3
9.4
Calculation parameters (password protected) ......................................... 36
Density: d, d(t/4), d(t/t) ................................................................................... 36
Result (Density, Concentration, BRIX, ALCOHOL, USER TABLE) ................ 36
Temperature compensation ............................................................................ 41
Decimals ........................................................................................................ 42
METTLER TOLEDO DE40/50/51 Density Meter
3
Contents
Page
10.
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.10
Functions (password protected) ............................................................... 43
Data File (Function 0) ..................................................................................... 43
Sample File (Function 1) ................................................................................ 46
Method File (Function 2) ................................................................................ 46
Changer (Function 3) ..................................................................................... 46
Factor (Function 4) ......................................................................................... 47
Set check (Function 5) ................................................................................... 47
Periodic (Function 6) ...................................................................................... 51
Auto Start (Function 7) ................................................................................... 51
CARD Utility (Function 8) ............................................................................... 52
Memory Clear (Function 9) ............................................................................ 53
11.
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
Setup (password protected) ....................................................................... 54
Interface (Setup 0) ......................................................................................... 54
Date and Time (Setup 1) ................................................................................ 55
Name (Setup 2) .............................................................................................. 56
Serial/Version number (Setup 3) .................................................................... 56
LCD Contrast (Setup 4) .................................................................................. 57
International (Setup 5) .................................................................................... 57
Lock with password (Setup 6) ........................................................................ 58
Beep (Setup 7) ............................................................................................... 58
Temperature calibration (Setup 8) .................................................................. 59
12.
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
12.10
Memory Cards (DE40, DE50 and DE51) .................................................... 60
Data Memory Cards: data, methods, sample files ......................................... 60
Save measured data ...................................................................................... 61
Clear measured data ...................................................................................... 62
Load measured data ...................................................................................... 63
Save method .................................................................................................. 64
Clear internal method ..................................................................................... 65
Load method .................................................................................................. 66
Save sample file ............................................................................................. 68
Clear internal sample file ................................................................................ 68
Load sample file ............................................................................................. 69
4
METTLER TOLEDO DE40/50/51 Density Meter
Contents
13.
13.1
13.2
13.3
14.
Application Memory Cards: BRIX, ALCOHOL, API, VISCOSITY CORRECTION, USER TABLES .................................................................................. 70
How to download an application (Install table) ............................................... 70
How to select the application ......................................................................... 71
How to retrieve an application (Uninstall table) .............................................. 73
14.1
14.2
14.3
14.4
14.5
14.6
Description of the special applications:
BRIX, ALCOHOL, API, VISCOSITY CORRECTION, COKE, USER TABLES 75
API software ................................................................................................... 75
Alcohol software ............................................................................................. 75
BRIX software ................................................................................................ 76
Viscosity correction ........................................................................................ 76
Coke (Cola drinks) ......................................................................................... 77
Coefficients for conversion to various concentration data .............................. 77
15.
15.1
15.2
Automatic sampling pump ASU-DE (optional) ........................................ 78
Safety measures ........................................................................................... 78
Installation ..................................................................................................... 79
16.
16.1
16.2
Error Messages and Malfunctions ............................................................. 82
Error Messages .............................................................................................. 82
Malfunction ..................................................................................................... 83
17.
17.1
17.2
17.3
17.4
Maintenance ................................................................................................ 84
Changing internal battery ............................................................................... 84
Power line voltage, power line, fuse ............................................................... 84
Replacing the silicagel ................................................................................... 84
Replacing the tube nozzles ............................................................................ 84
18.
18.1
18.2
Standard and optional equipment ............................................................. 85
Standard equipment ....................................................................................... 85
Optional equipment ........................................................................................ 86
MemoCard DE40/50/51 (Short Instructions) .............................................................. 88
Annex 1: Density table of dried air ............................................................................ 89
Annex 2: Density table of pure water ........................................................................ 90
Specifications ............................................................................................................... 91
METTLER TOLEDO DE40/50/51 Density Meter
5
Introduction
1.
Introduction
The DE40 and DE50/DE51 Density Meters measure the density d of gases, liquids and
solutions using the oscillating body method. They are distinguished by their temperature
range and their measurement accuracy. All three instruments:
• come with five certified water standards.
• measure gases, liquids and solutions with densities (d) in the range 0 to 3 g/cm3.
(DE40: with 0.0001 g/cm3; DE50/DE51: with 0.00001 g/cm3).
• need a minimum amount of substance (1.2 millilitres) for measurement.
• keep the temperature of the sample being measured constant thanks to a built-in thermostat
control (DE40: between 4 and 90 °C, DE50/DE51: between 4 and 70 °C).
• have 10 methods stored in their memory, which you can change to suit your measurements.
t
• show the density relative to water (specific gravity) at 4 °C (d 4 ) or at the measurement
t
temperature (d t ).
• calculate the concentration of a solution using tables or entered data of measured standard
solutions.
• calculate the density of a solution for a desired temperature using an entered temperature
function.
• have a built-in check function that allows to periodically check the accuracy of the instrument
without changing the instrument settings.
• store a maximum of 100 measured values.
• perform statistical evaluations (mean value, standard deviation, relative standard deviation)
and allow the recalculation of results.
• use Memory Cards for data storage, sample files and method transfer.
Special Application Memory Cards are available for all three instruments which allow the
automatic conversion of the experimental data into BRIX degrees, or alcohol concentration.
A special API software converts the density of oil products measured at elevated
temperatures automatically into the density at 15 °C (or 60 °F).
You can use an automatic sampling unit to perform continuous measurements; the built-in
RS-232C interface allows attachment of a computer to transfer experimental data. Print out
the entered parameters and data as well as results on a printer (option).
You can connect your instrument to a RE40 or RE50 refractometer to perform simultaneous
measurements of density and refractive index with one sample.
Connection of a SC24 sample changer allows fully automated measurements, even in
combination with a refractometer (RE40 or RE50).
Note:
6
Examples of the density given in these Operating Instructions are for the DE50/DE51.
METTLER TOLEDO DE40/50/51 Density Meter
Safety measures
2.
Safety measures
Measures for your safety
– Ensure that you plug the power cable supplied into a socket which is
grounded! In the absence of grounding, a technical fault could be lethal.
– Switch the instrument off and disconnect the power cable if you change
blown fuses! An electric shock could be lethal.
– Never work in a hazardous area! The housing of the instruments is not gas
tight (explosion hazard through spark formation, corrosion by gas diffusion
into the instruments).
– Measure readily inflammable, toxic and corrosive substances in a fume
hood and comply with the usual lab regulations!
Measures for operational safety
– Check the set operating voltage before you switch on the instrument! The
instrument will be damaged if the operating voltage does not match the line
voltage.
– Do not clean the measurement tube with concentrated sodium hydroxide
(caustic soda, NaOH) or hydrofluoric acid (HF)! Both substances chemically attack the measurement tube.
– Use only fuses of the specified type if you need to change them!
– Exclude the following environmental influences:
• powerful vibrations.
• direct sunlight.
• high atmospheric humidity.
• temperatures below 5 °C and above 35 °C.
• powerful electric or magnetic fields which influence the power supply
through large load fluctuations!
METTLER TOLEDO DE40/50/51 Density Meter
7
Density
3.
The density
3.1
Definition
The density ρ is the quotient of the mass m and the
volume V of a substance (mass density). As the
density depends primarily on the temperature, the
latter must always be specified.
ρ=
The relative density is the ratio of the density ρ of a
substance to the reference density ρο of a reference
substance under conditions which must be
specified separately for both substances.
ρ
d= ρ
0
m
V
[kg/m3] or [g/cm3]
[1]
Note: The DE40/DE50/DE51 calculate the relative density: the density of water at 4 °C
(dtt ) or at the measurement temperature (dtt ) is available as a reference. For this
purpose, the density of pure water as a function of temperature is stored in the
instruments.
3.2
Measurement principle
The density measurement of the DE40 and the
DE50/DE51 is based on the electromagnetically
induced oscillation of a glass U-tube.
One complete back and forth movement of a vibration
is a period, its duration is the period of oscillation T.
The number of periods per second is the frequency f.
Each glass tube vibrates at a so-called characteristic
or natural frequency. This changes when the tube is
filled with substance. The frequency is a function of
the mass. When the mass increases, the frequency
decreases, in other words period of oscillation T
incrases.
A magnet is fixed to the measurement tube in the
DE40/DE50/DE51 which is made to oscillate by a
transmitter. A sensor measures the period of
oscillation T.
Amplitude
Time
Oscillation
period T
f= 1
T
[s-1]
Magnet
Oscillator/
Vibration meter
8
Measurement tube of defined
volumetric capacity
METTLER TOLEDO DE40/50/51 Density Meter
Density
The period of oscillation T is obtained from the equation:
T = 2π
ρ
Vc
mc
K
ρVc + mc
K
=
=
=
=
Density of sample in measurement tube [g/cm3]
Volume of sample (capacity of tube) [cm3]
Mass of measurement tube [g]
Measurement tube constant [g/s2]
It follows that
K
2 m
T – c
2
Vc
4π Vc
ρ=
The density and the period of oscillation T are related as follows:
ρ = A T2 + B (see illustration)
A and B are constants which are determined by the elasticity, structure and mass of the
measurement tube. As the mass varies from tube to tube, it must be determined by
measurement. We refer to this as a factor determination or adjustment of the instrument. The
factor of the measurement tube is calculated by measuring the period of oscillation T of two
standard substances of known density, e.g. air and water:
F=
ρA
ρW
TA
TW
ρA – ρW
K
=
2
2
TA – TW
4π2 Vc
=
=
=
=
Density of air [g/cm3]
Density of water [g/cm3]
Period of oscillation of the air measurement [s]
Period of oscillation of the water measurement [s]
T2
The unknown density of a substance ρS
is calculated after the factor
determination by measurement of its
period of oscillation using the following
formula:
2
W
T
2
T
S
F (TA2 – TS2) = ( ρA – ρS)
T
Solving for ρS gives:
2
ρ
A
ρ = 0.00120
A
Note:
ρ
S
ρ
W
= 0.99821
ρS = ρA – F (TA2 – TS2)
The factor is temperature dependent. The volume of the measurement tube and its
period of oscillation change with temperature. It is thus necessary to determine the
factor of the cell for the temperature at which you measure your samples!
METTLER TOLEDO DE40/50/51 Density Meter
9
Density
The here described period of oscillation T is used to calculate the tube factor and from that
the density of the unknown sample. But this period of oscillation is not displayed on the
instrument. The DE40/DE50/DE51 display only the so-called T-value which is directly
related to the period of oscillation T:
Period of oscillation T =
T-value • Z • 0.2 µsec • (1/600)
with: Z = 10 for DE50/DE51
Z = 100 for DE40
T-value shown as T on the display of the instrument
So the T-value is an auxiliary value that makes use of the maximum display possibilities of
the instrument, using only digits and no decimals. This gives the maximum resolution
especially for the determination of the stability.
The stability for accepting the measured T-value can be set at three different levels (see
Section 8.3) to reduce measurement time, according to the need of the customer:
Stability 0: The stability of the measured signal (T-value) is waited for: ∆Tval ≤ 4 within 77 s
for the DE50/DE51, and ∆Tval ≤ 1 within 49 s for the DE40. The density is
measured with an accuracy of ±1*10-5 (DE40: ±1*10-4).
Stability 1: The final T-value is extrapolated with a patented algorithm from the course of the
slope (∆Tval/∆temp.), and the density is calculated. This cuts the measurement
time about by half while the result (i.e. density) in most cases is identical to that of
stability 0.
Stability 2: The final T-value is extrapolated at an earlier point with a patented algorithm
from the course of the slope (∆Tval/∆temp.), allowing a slightly higher
uncertainty, and the density is calculated. Thus the measurement time is cut
about by half again, while the density for most of the samples lies within ± 1 or 2
digits of that of stability 0.
End value
Time
End of measurement
with:
stability 2
10
stability 1
stability 0
METTLER TOLEDO DE40/50/51 Density Meter
Density
3.3
Construction of the measuring cell and temperature control
For correct density measurements a very accurate temperature control and measurement
must be guaranteed.
As the temperature in the sample can not be measured directly without disturbing the
measurement of the oscillation, a different approach is used. The temperature is measured
in three different spots:
- temperature 1: sensor placed in the measuring cell, directly over the surface of the
measurement tube. This temperature is shown on the status display (cell
temperature).
- temperature 2: temperature of the thermoblock, not displayed (block temperature).
- temperature 3: reference temperature inside the instrument, not displayed (ambient
temperature).
From these three temperatures the actual temperature in the sample is calculated with a
patented algorithm.
Temperature sensor 3 (ambient temperature)
Temperature controller
Thermoblock
Peltier element
Oscillator /
Vibration meter
Sample outlet
Sample inlet
Thermal insulation
Magnet
Temperature sensor 1
(cell temperature)
Measurement tube
Temperature sensor 2
(block temperature)
The cell temperature is compared with the inputted set temperature. The temperature
controller uses this cellblock/set difference to control the thermoelectric module (Peltier
element) which heats or cools the thermostatic block accordingly.
METTLER TOLEDO DE40/50/51 Density Meter
11
The instrument
4.
The instrument
Front view
1.
Desiccator
16. Connector to dry air
17. Pump in connector
(only withASU-DE)
7. Sampling speed
control (only with
ASU-DE)
8. Sampling/Drain switch
(only with ASU-DE)
2. Measuring cell
3. Cell window
9. Drain tube
4. LCD display
10. Waste bottle
(only with ASU-DE)
11. Sampling tube
5. Keypad
6. Memory card slot
12. GA42 printer (optional)
1.
Desiccator
For drying the measuring cell. Filled with silica gel.
2.
Measuring cell
Thermostated measuring cell (Oscillating glas U-tube).
3.
Cell window
To have a view into the measuring cell (check for air bubbles).
4.
LC display
The DE40, DE50 and DE51 have a seven-line liquid crystal display that shows measurement results,
conditions or parameters.
5.
Keypad (alphanumeric)
Start measurement, input of measurement conditions or calculation parameters are operated on keys.
6.
Memory card slot
To load and download data method and sample files and to load applications.
7.
Sampling speed control (ASU-DE)
To set the sampling speed (high for high viscous samples, low for low viscous samples).
8.
Sampling/Drain switch
When Sampling position is selected, the speed is controlled by the Sampling speed control. When Drain
position is selected, the speed is set to maximum (not controlled).
9.
Drain tube
Connects the measuring cell out to the pump in (ASU-DE) or to a waste ( without ASU-DE).
10. Waste bottle (ASU-DE)
Collects waste liquid (sample and rinsing solutions).
11. Sampling tube (ASU-DE)
Connect to the measuring cell in.
12. GA42 Printer (optional)
METTLER TOLEDO matrix printer.
12
METTLER TOLEDO DE40/50/51 Density Meter
The instrument
Rear view
19. Waste bottle tube
connection (only with
ASU-DE)
13. Measuring cell out
20. Pump exhaust (only
with ASU-DE)
14. Measuring cell in
15. Drain hole
21. Printer
connector
16. Dry air out
22. RS-232C
connector
17. Pump in connector
(only with ASU-DE)
23. Power switch
18. Sample
changer connector
24. AC power connector
25. I/O connector
26. Ext. cell or AD-510
13. Measuring cell out
Measuring cell ouput connector. Connect the drain tube here (9).
14. Measuring cell in
Measuring cell input connector. Connect the sampling tube here (ASU-DE) or a syringe (no ASU-DE).
15. Drain hole
To drain sample or rinsing solutions in case of leakage.
16. Dry air out
To dry the measuring cell connect the sampling tube (11) to this connector which is attached the desiccator (1).
17. Pump in connector (ASU-DE)
Connect the drain tube here (ASU-DE).
18. Connector for sample changer
connection of the SC24, SC24H, SC24L, CHG-260B sample changer, or the DCU-300B auto rinsing unit.
19. Waste bottle tube connection (ASU-DE)
Connect these tubes to the waste bottle lid (black tube to the higher connector: air suction; white tube to the
main lid: sample in).
20. Pump Exhaust
The exhaust air from the waste bottle goes out here.
21. Printer connector
This is for connection to an external printer(GA42 printer).
22. RS-232C connector
This is for connection to a personal computer or to our RE40 and RE50 refractometers.
23. Power switch
The power of DE40/50/51 is turned on or off by this switch.
24. AC power connector
Connect the power cable to the power supply. The instrument will automatically adjust its power supply unit
to the specific line voltage of your country as long as this is in the range between 100 and 240 V AC.
25. I/O connector
For connection of the SOP40 or SOP50.
26. Ext. cell
Connector for an external cell (option) or for the automatic drain unit AD-510 (option).
METTLER TOLEDO DE40/50/51 Density Meter
13
The instrument
4.2.
Keyboard
Display
Sample
Print
Report
Func.
Meas.
Para
Setup
Calc.
Para
7
8
9
ABC
DEF
GHI
4
5
6
JKL
MNO
PQR
1
2
3
STU
VWX
YZ
0
-
.
Check Calib.
BS
Rinse/
Purge Pump
Method
Enter
Clear
Esc.
Reset
Measure
BLK
Description of each key and its function:
Sample:
Key to set up sample parameters, like sample number and ID/No.
Report:
Key to change print format.
There are three kinds of format for printing.
(1) Short: Short form for printing minimum necessity of result data.
(2) GLP: GLP form, which complies with GLP requirements.
(3) Variable: User defined printing format.
Meas.
Para
Measuring
parameter
Key to change measuring parameter:
- Method name (8 characters, alphanumerical),
- Measuring temperature (from 15 to 70 °C),
- Stability (0, 1 or 2),
- Limit Time,
- Sample sequence (sampling, drain, rinse, purge and cell test),
- Calibration mode (air & water, other standards)
Calc.
Para
Calculation
parameter
Key to change calculation parameter:
- Result (d, d(t/t), d(t/4), application software). Setup concentration
function.
Sample
Report
14
METTLER TOLEDO DE40/50/51 Density Meter
The instrument
Method:
Key to select the method (0 to 9). The selection is done either by
pressing the "Up" and "Down" key or by pressing the corresponding
number key.
Display:
Key to change display or select numerics, capital or smallleters.
Print:
Key to print the displayed message or parameters.
Function:
Key to select following functions:
(0) Data File (statistics, delete data, re-calculate),
(1) Sample File,
(2) Method File,
(3) Changer (DCU-300, SC24, CHG-241),
(4) Factor (adjustment factor),
(5) Set Check (name, ref.value, tolerance),
(6) Periodic Check, Periodic Calibration (interval, show list),
(7) Auto Start (multiple measurement),
(8) CARD utility (install applications),
(9) Memory Clear (meas.data, meas.para, check list, calib. list, etc...).
Setup
Setup:
Key to select the setup parameters as follows:
(0) Interface:
Set up the RS-232C and the printer
(1) Date & Time: Set up date and time
(2) Name:
Register name (laboratory or operator)
(3) Serial/Ver. No.: Display serial and version No. of the unit
(4) LCD Contrast: Adjust brightness of LC display
(5) International: Select format for date and select unit (°C/°F) for
temperature
(6) Lock:
Set up a password for protection
(7) Beep:
Select beep (on / off, duration)
(8) Temp.Calib:
Run temperature calibration
Check
Check:
Key to start the instrument check: daily (always active) or precision
(only when due).
Calib.
Calibration: Key to start a calibration.
Method
Display
Print
Function
BS
Rinse/
Purge
Backspace: Key to erase one preceding letter or numeral.
Rinse/Purge With SC24 sample changers only. Runs an automatic rinse and purge
cycle, according to the selected sample sequence (see Meas.Para).
METTLER TOLEDO DE40/50/51 Density Meter
15
The instrument
Pump
Pump
For ASU-DE sampling pump. Starts and stops the pump.
Clear
Clear:
Key to erase the whole entry (2 x to clear names)
Esc.
Escape:
Key to return to the main display
Reset:
Key to abort a measurement or a calibration and to return
to main display.
Key to start a measurement
Reset
Measure:
Measure
7
0 – 9 key
ABC
.
Enter
–
Dot and hyphen key
Enter
Up
Left, Right
Down
16
Key to enter alphanumeric characters (the selection capi
tal/small letter or number is done with the <Display> key).
To select B, press twice, for C press three times.
On the key with the number 0 there is BLK (BLK = blank)
to insert blank spaces..
Key to confirm key entry. This key is also called [Enter]
key in this manual.

to move the cursor. The Left and Right keys are also
 Keys
used for selection within the menus.

METTLER TOLEDO DE40/50/51 Density Meter
The instrument
4.3
Display
The DE40, DE50 and DE51 density meters have a seven line LCD display with 40 characters
per line. When the power is turned on (power switch on the rear of the instrument), the
following message will appear on the display.
5 place Density Meter
DE50
Version X.XX
The software version appears for a
short time. This software version can
also be displayed under Setup 3
"Serial/Version".
After a few seconds the main display will appear:
0.Method-0
Temp.(°C)
01-01
Oscillation
845393
Set 20.00
Cell 21.42
The message "Wait for Reay" will
blink until the cell temperature
reaches the set temperature.
Wait for Ready
Once the cell temperature has reached the set temperature:
0.Method-0
Temp.(°C)
01-01
Oscillation
845393
Set 20.00
Cell 20.00
No Calibration
The "No calibration" message
appears if the instrument has not
been calibrated before or if a
Memory Clear has been performed
(see section 10.10 "Memory Clear").
Note: The Oscillation value is the T-value described in section 3.2 "Measurement principle".
0.Method-0
Temp.(°C)
01-01
Density(g/cm3)
Set 20.00
Cell 20.00
No Calibration
0.00120
You can toggle between all available
units by pressing the <DISPLAY>
key:
- Oscillation (T-value)
- Density [d(t/4, d(t/t)] (1)
- Concentration (2)
- ALCOHOL (3)
- BRIX (3)
(1) Selection of d, d(t/t: Specific Gravity), d(t/4) is done under Calc.Para – Density.
(2) Selection of Concentration is done under Calc.Para – Result.
(3) Selection of ALCOHOL, BRIX is done under Calc.Para – Result, but requires to install the
application from a special Application Memory Card (see section 13).
METTLER TOLEDO DE40/50/51 Density Meter
17
Getting started
5.
Getting started
Before connecting the power cord after unpacking the instrument loosen or remove the three
security screws: remove the backplane in the upper part of the instrument and loosen the
three large screws (marked with red) just right of the pump box (refer to section 15.2 for more
help).
These screws are used as a transportation security only to hold in place the measuring cell
during shipment. For correct operation they must be loosened or removed.
When the instrument is switched on the first time, it is recommended to reset it electronically
to its default values as described in section 10.10 (function 9, memory clear: all parameter).
5.1
Setting up the instrument
5.1.1
Printer (Setup 0)
If you work without printer you can skip this section and go directly to section 5.1.2.
Perform the following steps if you have a GA42 printer to connect:
- Make sure that the DIP switch 2 is ON on the GA42 printer.
- Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
Select "0.Interface". Confirm with
<ENTER>.
< Interface >
Select "1.Printer". Confirm with
<ENTER>.
0.RS-232C
1.Printer
< Printer >
Printer
Exit
: IDP- DP:[Execute]
GA-
Other
Select "GA-" with the → key.
Confirm with <ENTER>.
- To choose the format of the printed results press the <REPORT> key and choose between
"None", "Short", "GLP" and "Variable" (see section 7 "Report").
- Then press the <RESET> key.
18
METTLER TOLEDO DE40/50/51 Density Meter
Getting started
5.1.2
Date and time (Setup 1)
- Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
Select "1.Date&Time". Confirm with
<ENTER>.
5.International
6.Lock
7.Beep
8.Temperature
Actual date and time are displayed.
Press <ENTER> key.
Enter date and time (the date format
is selected in the menu Setup „5.
International”) and confirm with
<ENTER>.
< Date & Time >
16/07/1998
Day
:[16]
Month :[ 7]
Year :[1998]
5.1.3
17:24
Hour
:[17]
Minutes:[22]
Exit
:[Execute]
Enter the lab name (Setup 2)
- Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Name >
Name
: [Quality Lab 1
Exit
: [Execute]
A
]
Select „2. Name”. Confirm with
<ENTER>.
The capital A means that the
alphanumerical keyboard is in entry
mode for capital letters. Press the
<DISPLAY> key to change the entry
mode:
A: capital letters (A, B, C, D, ..)
a: small letters (a, b, c, d, ...)
1: numbers (0, 1, 2, 3, 4, ...)
Enter the lab name or the instrument name using the alphanumeric keys, e.g. „Quality
Lab 1”, and confirm with <ENTER>. The instrument is now ready for calibration and the first
measurements.
5.2
Performing the first adjustment (calibration)
For correct measurements the instrument should always be adjusted at the measuring
temperature.
After turning on the instrument allow at least 20 minutes for the instrument to warm up
before performing the first adjustment.
Note:
According to the International Vocabulary of Basic and General Terms in Metrology from DIN
the operation of bringing a measuring instrument into a state of performance suitable for its
use is called adjustment.
METTLER TOLEDO DE40/50/51 Density Meter
19
Getting started
The earlier used term calibration should not be used anymore for this purpose as soon as
instrument settings are changed or adapted in order to ensure correct measurement values.
We recommend to select one method which you will dedicate to the adjustment:
Method 9
< Meas.Parameter >
VA
Select
Stability 0
and Limit Time 0 s.
Method Name
:[ADJUST ]
Measurement Temp.:[ 20.00]°C
Stability
:[0]
Limit Time
:[
0]s
Sequence
: Off On
5.2.1
Clean the measuring cell
a) If you have a sampling pump ASU-DE:
- Insert the sampling tube into a beaker containing a high volatile solvent (e.g. acetone or
ethanol).
- Press the <PUMP> key . Flush the measuring cell during approximately 10 s. Adjust the
sampling speed with the Sampling Adj. control at the rear right side of the instrument so that
it takes approximately 5 s from starting the pump to fill the measuring cell (the solvent
appears in the drain tube at the top of the cell). During the pumping it is recommended to
remove the sampling tube from the beaker and insert it again to create some air bubbles.
This will result in a much more efficient cleaning.
- Remove the sampling tube from the beaker.
- Press the <PUMP> key again to stop the pump.
b) If you don't have a sampling pump ASU-DE (only a built-in air pump):
- Flush the measuring cell using a syringe filled with approx. 10 mL of high volatile solvent
(e.g. acetone or ethanol). Suck back the remaining solvant with the syringe.
5.2.2
Dry (purge) the measuring cell
If you have a sampling pump ASU-DE or not, the following steps will be the same:
- Insert the sampling tube into the dry air outlet (white connector without black ring).
- Keep the <PUMP> key pressed for approx. 2 s (until the message "Purge Checking"
appears on the display.
9.ADJUST
01-01 This Purge Checking will autoTemp.(°C)
Oscillation
matically turn off the pump when the
cell will be dry, i.e. when the
Set 20.00
oscillation value doesn't change
Cell 20.00
anymore.
Note: you can also stop the pump
yourself by pressing the
<PUMP> key .
845393
Purge Checking
20
METTLER TOLEDO DE40/50/51 Density Meter
Getting started
5.2.3
Performing the air adjustment
Whether you have a sampling pump ASU-DE or not, the following steps will be the same:
- Press the <CALIB.> and follow the directions on the display:
9.ADJUST
01-01
Temp.(°C)
Oscillation
If the cell is really clean and dry,
press <ENTER>.
Set 20.00
Cell 20.00
845393
Purge OK?
9.ADJUST
Temp.(°C)
01-01
Oscillation
While adjusting to the air value the
display shows:
845393
Set 20.00
Cell 20.00
Calibrating
9.ADJUST
Temp.(°C)
01-01
Oscillation
845393
Set 20.00
Cell 20.00
Wait until the next message is
displayed.
Set Water
5.2.4
Performing the water adjustment
- Open a vial of certified water (one of the five delivered water standards). This water will be
used for the adjustment.
Note: you can also use bi-distilled water, but we recommend to use our certified water for
traceability.
a) If you have a sampling pump ASU-DE:
- Remove the sampling tube from the measuring cell.
- Remove the drain tube connection from the ASU-DE pump (white connector with black ring).
b) The next steps will be the same wether you have a sampling pump ASU-DE or not:
- Pierce the septum of the certified water standard with the tip of the syringe.
- Fill the syringe with approx. 8 mL of certified water.
- Remove the tip of the syringe and insert the syringe in the sample inlet (lower measuring tube
connection).
- Perform an analytical rinse, i.e. fill approx. 2 mL carefully, wait for 10 s without removing the
syringe, then fill in again 2 mL very carefully. During the filling watch carefully that no air
bubbles enter the measuring cell.
METTLER TOLEDO DE40/50/51 Density Meter
21
Getting started
- Leave the syringe in the sample inlet .
- Press <ENTER>.
9.ADJUST
01-01
Temp.(°C)
Oscillation
While adjusting to the water value
the display shows:
1086415
Set 20.00
Cell 20.00
Calibrating
9.ADJUST
Temp.(°C)
Set 20.00
Cell 20.00
OK
Calibration
2.141349
At the end the calibration result is
displayed. The number on the right
side is the calibration factor (see
section 3.2 "Measuring principle")
and can be considered as a cell
constant.
[Calibration]
Date : 29/06/1998 11:15
Result
: OK
Temperature : 20.0 °C
The results of the adjustment are
printed on the attached printer:
OLD –––> NEW
Air
T
d
845392
0.00120
845393
0.00120
Water
T
d
1086413
0.99820
1086415
0.99821
Factor
2.141345
2.141349
Name : Quality Lab 1
----------------
9.ADUST
Temp.(°C)
Set 20.00
Cell 20.00
FAILED
Calibration
When the instrument fails to do the
adjustment it will show the error
message:
In such a case clean the measuring cell well, dry it, and repeat the adjustment. If it fails again,
then exchange the pure water (make sure it really is of the appropriate quality. i.e. our
certified water standard, doubly distilled or correctly deionized). If the adjustment still does
not succeed, contact your dealer for technical assistance.
22
METTLER TOLEDO DE40/50/51 Density Meter
Getting started
5.3
Perform a measurement
Perform for example two measurements with your standard sample.
5.3.1
Set the parameter of the method
- Press the <MEAS.PARA> key.
Method 0
< Meas.Parameter >
VA
Method Name
:[TestMeth]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[ 600]s
Sequence
: Off On
Method 0
< Meas.Parameter >
Sampling
Sampling Time
Drain
Drain Time
Rinse-1
Method 0
:[
5]s
: Off Set
: Off Set
:[ 60]s
: Off On
Setting of the sequence with
ASU-DE: Set the parameters according to the following displays.
Auto
VA
Auto
Auto
< Meas.Parameter >
Calib.
Exit
5.3.2
VA
Auto
< Meas.Parameter >
Rinse-1 Time
Rinse-2
Purge
Purge Time
Cell Test
Method 0
: Off Set
:[
5]s
: Off Set
:[ 10]s
: Off Set
Enter your method name and
measuring temperature. Leave
stability and limit time as given.
Select "Sequence On" with the →
key (with ASU-DE). The sequence
has to be "Off" without ASU-DE.
:<Air&Water>
: [Execute]
Define the sample file (with or without ASU-DE)
- Press <SAMPLE> to enter the sample data: sample number and sample ID.
Enter sample no, for example 02-01:
press 2 <ENTER> 1 <ENTER>.
< Sample >
Sample No.
Sample ID
Exit
: [02]-[01]
: [ORANGE
: [Execute]
]
METTLER TOLEDO DE40/50/51 Density Meter
Enter your sample ID using the
alphanumeric keys (max. 10
characters) and confirm with
<ENTER>.
23
Getting started
5.3.3
Sampling with ASU-DE
- Dip the sampling tube into the beaker containing your sample.
- Press the <MEASURE> key.
11.TestMeth
ORANGE
02-01 The sampling will be done autoTemp.(°C)
Oscillation
matically, according to the
predefined time.
Set 20.00
Cell 20.86
Once the sampling is done, remove
the sampling tube from the beaker.
1086414
Sampling
5.3.4
Sampling without ASU-DE
- Fill the syringe with approx. 3 mL of your sample.
- Insert the syringe in the sample inlet (lower measuring tube connection).
- Fill the measuring cell with the syringe (approx. 2 mL). During the filling watch carefully that
no air bubbles enter the measuring cell.
- Leave the syringe in the sample inlet.
5.3.5
Measurement
0.TestMeth
Temp.(°C)
Set 20.00
Cell 20.86
ORANGE
2-01
Oscillation
1086414
Measuring
0.TestMeth
Temp.(°C)
ORANGE
02-01
Density(g/cm3)
0.99820
Set 20.00
Cell 20.00
Result
Press the <MEASURE> key.
Press the <DISPLAY> key to switch
from Oscillation to Density.
When the measurement is finished,
the result is displayed and printed.
*** Result ***
Sample No.
Note:
This printout corresponds to the selection
GLP for the report. See section 7 "Report"
for more information.
02-01
Date : 29/06/1998 11:15
Sample ID
: ORANGE
Method No. : 0
Method Name : TestMeth
Meas.Temp. : 20.00 °C
Period T
: 1086422
d[g/cm3]
: 0.99821
Meas.Time
: 00:00:36
Name : Quality Lab 1
--------------
24
METTLER TOLEDO DE40/50/51 Density Meter
Getting started
5.3.6
Cleaning and rinsing of the cell with ASU-DE
0.TestMeth
Temp.(°C)
ORANGE
02-01
Density(g/cm3)
0.99820
Set 20.00
Cell 20.00
Follow the instructions on the
display for the rinsing and purging.
Use a highly volatile solvent (e.g.
acetone or ethanol) for the rinsing.
Set Rinse-1
5.3.7
Cleaning the cell without ASU-DE
- suck back the sample into the syringe.
- flush the measuring cell with appropriate solvent.
- if necessary flush again with a highly volatile solvent (for example acetone or ethanol) to
facilitate the drying of the cell.
- dry the measuring cell according to section 5.2.2.
METTLER TOLEDO DE40/50/51 Density Meter
25
Sample and sample file
6.
Sample (Number and ID) and Sample File
Here you can define your sample identifications like sample number and sample ID.
The sample number is composed of two parts: for example [03]–[01].
[03]: The first two-digit number – ranging from 00 to 98 – represents the series number of
your measurement series. In the instrument it is called "High Sample No.". If you group your
measurements of different sample types by this series number, you can conveniently
process your data statistically later on.
[01]: The second two-digit number – ranging from 00 to 99 – is automatically increased by
one per measurement.
Additionally you can define a sample ID, for example a sample name or the Lot number.
Press the <SAMPLE> key.
< Sample >
Sample No.
Sample ID
Viscosity
Exit
6.1
: [03]-[01]
: [ORANGE
: off on
: [Execute]
]
(*)
Enter the sample ID using the alphanumeric keys (max. 10 characters
including "space", "period" and
"hyphen").
(*) Appears with DE51, or with DE40
with viscosity correction (memory
card).
Sample File (sample changer)
If you have connected a sample changer (see Function 3 "Changer") or set a sample file (see
Function 1 "Sample File") another display will appear when pressing the <SAMPLE> key:
Sample File
Max.Meas.No.
Next.Meas.No
Method
Set Parameter
Exit
< Sample >
:Skip
Load
Save
:[ 24]
:[
1]
:Current Variable
:[Execute]
:[Execute]
The first line is usually skipped,
except when you want to SAVE OR
load a sample file with a Memory
Card (see section 12.8 to 12.10).
Max.Meas.No:
This is the total number of samples to be measured. This number can be higher than 24
(when used with the SC24). This number can be changed during the measurement. For
example set this number to 12 if you have only 12 samples to measure when you start and
change it later to 25 if you get 13 more samples to measure.
Next.Meas.No:
This is the next measurement number (according to the sample file). It is increased
automatically after each measurement.
26
METTLER TOLEDO DE40/50/51 Density Meter
Sample and sample file
Method:
Here you can select if you want to perform all measurements with one method only (current
method) or with different methods (variable).
Example:
You always get a series of 12 samples of grape juice and 7 samples of orange juice to
measure. You want to check for each series your instrument with a check standard.
You will have to set up 3 different methods as follows:
Method-0
Grape.J
20.00°C
2
Method Name
Meas.Temp.
Stability
Method-1
CheckStd
20.00°C
0
Method-2
Orange.J
20.00°C
2
You will the define a sample file as follows:
Sample File
Max.Meas.No.
Next.Meas.No
Method
Set Parameter
Exit
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
M
0
0
0
0
0
0
0
0
0
0
0
0
1
2
2
2
2
2
2
2
< Sample >
:Skip
Load
Save
:[ 20]
:[
1]
:Current Variable
:[Execute]
:[Execute]
< Sample List>
S.No.
Sample ID
01-01
GRAPE
01-02
GRAPE
01-03
GRAPE
01-04
GRAPE
01-05
GRAPE
01-06
GRAPE
01-07
GRAPE
01-08
GRAPE
01-09
GRAPE
01-10
GRAPE
01-11
GRAPE
01-12
GRAPE
50-01
STANDARD
02-01
ORANGE
02-02
ORANGE
02-03
ORANGE
02-04
ORANGE
02-05
ORANGE
02-06
ORANGE
02-07
ORANGE
METTLER TOLEDO DE40/50/51 Density Meter
This sample file will run all 12 Grape
juices with method 0 "Grape.J",
then the check standard with
method 1 "CheckStd" (this method
has a higher stability as it is required
to check the instrument),
then run all 7 orange juices.
It will allow to run the statistics on
each sample separately.
If the next series would be without
the first 12 grape juices, you would
have to select:
Max.Meas.No: 20
Next.Meas.No: 13
27
Sample and sample file
6.2
Viscosity correction
For viscosity corrected measurements the instrument has to be adjusted with the viscosity
correction set to "On". Viscosity correction is available for the DE51 (standard) or for the
DE40 (optional Memory Card).
Select "Viscosity" to be on in the Sample display as below.
< Sample >
Sample No.
Sample ID
Viscosity
Exit
: [03]-[01]
: [ORANGE
: off on
: [Execute]
(*) This line appears only with the
DE51, or the DE40 with viscosity
correction (Memory Card.)
]
(*)
When working with a Sample File the viscosity correction can be chosen for each sample
individually.
No.
1
2
3
4
5
M
1
1
1
2
2
< Sample List >
S.No.Sample ID
01-01
ABC
01-02
DEF
01-03
GHI
01-04
JKL
01-05
MNO
Vis.
On
On
On
Off
Off
The measurement display shows "Visc.", if the sample is measured with viscosity correction.
0.Method-0
Temp.(°C)
Set 20.00
Cell 20.00
01-01
Density (g/cm3)
Visc.
1.23456
Note: When Viscosity correction
is chosen "On", the Stability
of the measurement will be
fixed to "O".
Measuring
In viscosity correction mode the instrument first waits for stability, which will be signalized
with a beep, and then starts the viscosity correction measurement.
In GLP mode the T-values without and with viscosity correction as well as the corrected
density will be printed.
28
METTLER TOLEDO DE40/50/51 Density Meter
Report
7.
Report (password protected)
In the <REPORT> menu you can choose the format of your printout according to the
following table.
Name
Model, Serial, Version
Sample No.
Date & Time
Sample ID
Method No., Method name
Meas.Temp.
Period T
Meas. Data
Temp. Comp.
Result
Meas. Time
Short
GLP
Variable
X
X
X
X
X
X
X
X
X
X
X
X
X
X
choice
choice
choice
choice
choice
choice
choice
choice
choice
choice
choice
X
X
X
X
These report parameters can be set individually for each of the 10 methods.
METTLER TOLEDO DE40/50/51 Density Meter
29
Measuring parameters
8.
Measuring parameter (password protected)
This section describes how to set the measuring parameters for the methods. These
measuring parameters can be set for each of the 10 methods:
Parameter
Method name
Measuring temperature
Stability (0-2)
Limit Time
Sequence
No. Name
0.Method-0
1.Method-1
2.Method-2
3.Method-3
4.Method-4
8.1
< Method List >
Temp.(°C)
Result
20.00
d
20.00
d
20.00
d
20.00
d
20.00
d
Default value
Method-x
20.0 °C
1
0s
Off
.
Press the <METHOD> key.
First select the method for which you
want to set the measuring
parameters.
Press <ENTER> to confirm.
Method name
This option is used to define method names for each method. You can enter names according to products or according to operators, depending on your needs.
- Press the <Meas.Para> key.
Method 0
< Meas.Parameter >
Method Name
:[Method-0]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[ 600]s
Sequence
: Off On
VA
The default name is displayed.
Press the <CLEAR> key twice to
clear the name.
Press the <DISPLAY> key to select
the input mode of the keyboard:
A: CAPITAL LETTERS (A, B, C,...)
a: small letters (a, b, c, d, ...)
1: numbers (0, 1, 2, 3, ...)
Examples of method names (either by product or by operator):
Product names
Operator names
Orange
Smith
Grape
Nelson
Lemon
McNeil
Apple
Gordon
.
.
Enter your method name using the alphanumeric keys (max. 8 characters) and confirm with
<ENTER>.
30
METTLER TOLEDO DE40/50/51 Density Meter
Measuring parameters
8.2
Measuring temperature
This option is used to set the measuring temperature.
Method 0
< Meas.Parameter >
Enter your measuring temperature
(from 4 °C to 70 °C, 4 °C to 90 °C
for DE40) and confirm with
<ENTER>.
VA
Method Name
:[Method-0]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[
600]s
Sequence
: Off On
Note: After changing the set temperature make sure to allow enough time for the instrument to warm up.
To increase the temperature:
from
to
change time
To decrease the temperature:
from
to
change time
10 °C ⇒ 20°C
+10 °C
30 min
20 °C ⇒ 10°C
-10°C
1 hour
20 °C ⇒ 30°C
+10 °C
30 min
30 °C ⇒ 20°C
-10°C
1 hour
20 °C ⇒ 70°C
+50 °C
1 hour
70 °C ⇒ 20°C
-50°C
2 hours
8.3
Measurement stability
This option is used to set the measurement stability, which allows to shorten the measuring
time. See section 3.2 "Measurement principle" for more details.
Method 0
< Meas.Parameter >
VA
Method Name
:[Method-0]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[
600]s
Sequence
: Off On
Enter your stability (0, 1 or 2) and confirm with <ENTER>.
0: Maximum stability. The measured signal (T-value) has to be stable before the density is
accepted. Longest measuring time (Time-0).
1: High stability. The final T-value is extrapolated, and the density is calculated. Medium
measuring time. ( Time-1 is approximately 1/2 of Time-0) .
2: Low stability. The final T-value is extrapolated from less values, and the density is
calculated. Lowest measuring time. ( Time-2 is approximately 1/4 of Time-0).
Note: Stability is fixed to zero when viscosity correction is active (section 6.2).
METTLER TOLEDO DE40/50/51 Density Meter
31
Measuring parameters
8.4
Limit time
This option is used to set the limit time. When this time limit is reached, the measurement is
stopped and the measured value taken, even if it is not stable.
Method 0
< Meas.Parameter >
VA
Method Name
:[Method-0]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[
600]s
Sequence
: Off On
8.5
Enter the limit time (enter 0 s for no
limit time).
Sequence (sampling, drain, rinse, purge)
This option is used to set a sample sequence. This sample sequence is mainly used together
with the sampling pump ASU-DE or with the sample changer SC24. It can be used as a SOP
(Standard Operating Procedure) with the ASU-DE. This sample sequence allows you to
define sampling time, drain time, rinsing times (for two different solutions) and purge time.
Method 0
< Meas.Parameter >
VA
Method Name
:[Method-0]
Measurement Temp.:[ 20.00]°C
Stability
:[1]
Limit Time
:[
600]s
Sequence
: Off On
Method 0
< Meas.Parameter >
Sampling
Sampling Time
Drain
Drain Time
Rinse-1
: Off Set
:[
5]s
: Off Set
:[ 10]s
: Off Set
VA
Auto
Auto
Select sequence "On" with the →
key to set a sample sequence.
Confirm with <ENTER>.
Select the input mode of the
sampling time:
Set : Manual input, time is set by
operator.
Auto: Automatic setting of sampling
time. (see section 8.7)
Off : No sampling.
If you have selected "Set" you have to enter the sampling time (0 to 9999 s). For most of the
non viscous samples we recommend a sampling time of 5 s. Once you have set the sampling
time, adjust the sampling speed (Sampling Adj. control on the ASU-DE or on SC24) in order
to get the sample in with this sample time.
Method 0
< Meas.Parameter >
Sampling
O.S.Rate
Sampling Limit
Drain Time
Drain Time
32
: Off Set
:[ 70]%
:[ 0]s
: Off Set
: [ 10]s
Auto
VA
If you have selected "Auto" you have
to enter the "Over Sampling Rate"
and the "Sampling Limit".
Auto
METTLER TOLEDO DE40/50/51 Density Meter
Measuring parameters
O.S.Rate:
The instrument will detect how much time it needs from starting the pump
until the sample reaches the measuring cell and will add the O.S.Rate to
this time.
Sampling Limit:This is the sampling time which should not be exceeded. After this time the
pump automatically stops.
Method 0
< Meas.Parameter >
Sampling
O.S.Rate
Sampling Limit
Drain
Drain Time
: Off Set
:[ 70]%
:[ 0]s
: Off Set
: [ 10]s
VA
Auto
Auto
Select the input mode of the drain
time:
Set : Manual input, time is set by
the operator.
Auto: Automatic setting of drain
time. (see section 8.7).
Off : No draining.
If you have selected "Set" you have to enter the drain time (0 to 9999 s). A typical drain time
for non-viscous samples is about 10 s to 20 s.
Method 0
< Meas.Parameter >
Sampling
O.S.Rate
Sampling Limit
Drain
Drain Rate
Method 0
: Off Set
:[ 70]%
:[ 0]s
: Off Set
: [ 100]%
: Off Set
:[ 10]s
: Off Set
:[ 10]s
: Off Set
If you have selected "Auto" you have
to enter the Drain Rate. The
instrument will use this percentage
of the sampling time as drain time.
VA
Select the input mode of the Rinse-1
time:
Set : Manual input, time is set by
operator.
Off : No Rinse-1.
Auto
Auto
< Meas.Parameter >
Rinse-1
Rinse-1 Time
Rinse-2
Rinse-2 Time
Purge
VA
Auto
If you have selected "Set" you have to enter the Rinse-1 time (0 to 9999 s). We recommend
to use a dedicated solvent for your sample as Rinse-1 solution.
Method 0
< Meas.Parameter >
Rinse-1
Rinse-1 Time
Rinse-2
Rinse-2 Time
Purge
: Off Set
:[ 10]s
: Off Set
:[ 10]s
: Off Set
Auto
METTLER TOLEDO DE40/50/51 Density Meter
VA
Select the input mode of the Rinse-2
time:
Set : Manual input, time is set by
operator.
Off : No Rinse-2.
33
Measuring parameters
If you have selected "Set" you have to enter the Rinse-2 time (0 to 9999 s). We recommend
to use a volatile solvent as Rinse-2 solution (e.g. acetone). This will allow to speed up the
purging of the measuring cell.
Select the input mode of the Purge time:
Method 0
< Meas.Parameter >
Rinse-1
:Off
Set
Rinse-1 Time :[ 10]s
Rinse 2
:Off
Set
Rinse-2 Time :[ 10]s
Purge:
:Off Set
VA
Auto
Set:
Manual input, time is set by
the operator.
Off: No Purging.
Auto: Purge will stop automatically
when the cell is dry, i.e. when
the oscillation value doesn't
change anymore.
If you have selected "Set" you have to enter the Purge time (0 to 9999 s).
If "Set" or "Auto" has been selected for the purge action you can set a "Cell Test" to be
performed after the end of the drying action (purge).
Method 0
< Meas.Parameter >
Cell Test
Reliability
Calib.
Exit
VA
:Off On
:[10]
:<Air & Water>
:[Execute]
Select Cell Test: "On" to perform an
automatic cell test at the end of the
purge sequence.
Enter the reliability value.
The "Cell Test" measures the density of the empty cell (air) and compares it to the theoretical
density of air at this temperature (value is stored in the instrument). A reliability value can be
entered, which stands for the maximum tolerated difference between the measured and
theoretical density of air. Its default value is 10.
A reliability of 10 means: - DE40:
- DE50 and DE51:
8.6
±10 * 10-4 g/cm3
±10 * 10-5 g/cm3
Adjustment mode (Calibration selection)
This option is used whenever you want to select special standards for adjustment. The
standard adjustment mode is with air & water.
Method 0
< Meas.Parameter >
Cell Test
Calib.
STD-1 Density
STD-2 Density
Exit
34
:Off On
:<Other STD>
:[ 0.99821]
:[ 1.49320]
:[Execute]
VA
Select Calib.:<Other STD> to
perform the adjustment with your
own density standards.
Enter the values of these two
density standards.
METTLER TOLEDO DE40/50/51 Density Meter
Measuring parameters
Note:
8.7
The Cell Test is not available if you select "Other STD". Only very accurate density
standards should be used for adjustment with other standards, otherwise your
density meter could give wrong results.
Explanation of auto-sampling and auto-draining
You have selected "Auto" for the sampling and for the draining, for example with:
Over Sampling rate = 30%
Drain rate = 70%
If the time measured from starting the pump until the sample reaches the measuring cell
(with ASU-DE or SC24) is 10 s, then the sampling and the drain time will be:
Sampling time = 10 + (10 x 0.30) = 13 s
Drain time = 13 x 0.70 = 0.91 s
When using this oversampling rate (O.S.Rate) make sure that the measurement cell as well
as the ingoing tubings are empty and dry when you press the <MEASURE> key. The
instrument detects the sharp change of the measurement signal caused by the sample
entering the cell.
METTLER TOLEDO DE40/50/51 Density Meter
35
Calculation parameters
9.
Calculation parameters (password protected)
This section describes how to select the type of results (density, specific gravity,
concentration), the number of decimals for these results and how to set the parameters for
the concentration calculation. These calculation parameters can be set for each of the 10
methods.
Press the <CALC.PARA> key.
Method 0
< Calc.Parameter >
0.Density
1.Result
2.Temperature Compensation
3.Decimals
9.1
Density: d, d(t/4), d(t/t)
Select CALC.PARA - Density
Method 0
< Density >
Density
Exit
At 20 °C:
9.2
:d
d(t/4)
d(t/t)
:[Execute]
20
d(t/t) = d20
Select what density should be
displayed and printed:
d:
mass density (real density).
d(t/4): relative density referred to
water at 4 °C.
d(t/t): relative density referred to
water at the measurement
temperature.
and d(t/4) = d420
Result (Density, Concentration, BRIX, ALCOHOL, USER TABLE)
Select CALC.PARA - Result.
Method 0
Result
Exit
Note:
36
< Result >
:<d
>
:[Execute]
Select which result should be
displayed and printed:
d:
density, resp. d/t/t) or d(t/4),
depending on the selected
density (previous step).
Conc.: concentration.
here you can also select concentration applications, if they have been previously
loaded with a Memory Card (See also section 13 "Application Memory Cards):
BRIX, ALCOHOL, USER TABLE.
METTLER TOLEDO DE40/50/51 Density Meter
Calculation parameters
Concentration
Method 0
Result
Exit
< Result >
:<Conc.
:[Execute]
>
Select "Conc." with the → key.
Confirm with <ENTER>.
You will select this option if you want to determine the concentration of two-component
solutions, e.g. aqueous solutions of glycerol or acetone. Ask your local representative for
available concentration tables or download them from our Internet Homepage:
www.density.com.
There are two ways to program a concentration function, either by entering this function
directly (provided that this function is already known) or by entering a concentration table
(data pairs of density and corresponding concentration).
First you have to select the unit for your concentration. This unit should be the same as that
of the solution used: the instrument does not convert units.
Method 0
< Result >
Result
Conc.Unit
Conc.Formula
Parameter Set
Data Replace
:
:
:
:
:
<Conc.
>
<None
>
<A+Bx
>
Table Coefficient
<x<-d-R >
Select your "Conc.Unit" with the →
key. Confirm with <ENTER>.
Following units are available: No
unit, %, ppm, mg/g, mg/mL, mg/L,
g/L, Eq/L, mol/L, g/cm3.
Then you have to select the concentration formula. If your concentration function is known
already, select the same function. If your concentration function is not known (input of
concentration table) select the formula which best fits your concentration. As a rule of thumb
we recommend to select A+Bx+Cx2 if you don't know which formula to select.
Case 1: Direct input of concentration function (known concentration function)
We will describe this function using an example: measurement of Apparent Extract in beer.
The function to convert density into Apparent Extract is:
20
20 2
Apparent Extract = -460.234 + 662.649 x d20
- 202.414 x [d20
]
The following steps have to be performed:
Method 0
< Result >
Result
Conc.Unit
Conc.Formula
Parameter Set
Data Replace
:
:
:
:
:
<Conc.
>
<%
>
<A+Bx+Cxx
>
Table Coefficient
<x<-d-R >
METTLER TOLEDO DE40/50/51 Density Meter
Select "%" as Conc.Unit with the →
key. Confirm with <ENTER>.
Select "A+Bx+Cxx" with the → key.
Confirm with <ENTER>.
37
Calculation parameters
Method 0
< Result >
Result
Conc.Unit
Conc.Formula
Parameter Set
Data Replace
Method 0
:
:
:
:
:
<Conc.
>
<%
>
<A+Bx+Cx2
>
Table Coefficient
<x<-d
>
Select "Coefficient" with the → key.
Confirm with <ENTER>.
Select "x <- d" with the → key.
Confirm with <ENTER>. See also
paragraph "Constants used" on
page 41.
< Result >
A
B
C
Exit
:[ -460.234]x10[ 0]
:[ 662.649]x10[ 0]
:[ -202.414]x10[ 0]
:[Execute]
Enter the A, B and C values
Confirm with <ENTER>.
Now the DE40 (DE50 or DE51) has been programmed to measure APPARENT EXTRACT
in beer. Load the measuring cell with degased beer (any air bubbles would lead to wrong
results). After pressing <MEASURE>, the following values will be displayed:
0.Method-0
Temp.(°C)
01-01
Conc.(%)
Set 20.00
Cell 20.00
1.8804
Measuring
0.Method-0
Temp.(°C)
01-01
Conc.(%)
Set 20.00
Cell 20.00
1.88
Result
During the measurement the
temperature and the concentration
are displayed.
At the end of the measurement the
final result will be displayed
(APPARENT EXTRACT
concentration).
Note: you can select the number of
decimal places under "Calc.
Para.-Decimals".
Note: This concentration function can also be used to convert the density into other units,
e.g. into API degree. The function used to convert density into API degree is:
20
API degree = [(1/d20
) - 1] x 141.5 + 10
Case 2: Input of concentration table (concentration function unknown)
We will describe this function using an example: measurement of sulfuric acid concentration
(aqueous solution). You will have to enter a concentration table (data pairs of density and
corresponding concentration), the DE40 (DE50, DE51) will determine automatically the
correct coefficients for the concentration function.
38
METTLER TOLEDO DE40/50/51 Density Meter
Calculation parameters
Concentration table for sulfuric acid (from "Handbook of Chemistry and Physics").
1
2
3
4
5
6
7
8
9
Concentration
(in %)
10
20
30
40
50
60
70
80
90
Method 0
Select "%" with the → key. Confirm
with <ENTER>.
:
:
:
:
:
<Conc.
>
<%
>
<A+Bx+Cx2
>
Table Coefficient
<x<-d-R >
Select "A+Bx+Cx2" with the → key.
Confirm with <ENTER>.
Select "Table" with the → key.
Confirm with <ENTER>. The best
results are obtained if <x← d-R> is
selected for data replace (see note
on next page).
< Result >
Result
Conc.Unit
Conc.Formula
Parameter Set
Data Replace
Method 0
Note: see our Internet Homepage
www.density.com for other concentration tables.
< Result >
Result
Conc.Unit
Conc.Formula
Parameter Set
Data Replace
Method 0
d
(at 20 °C)
1.0661
1.1398
1.2191
1.3028
1.3952
1.4987
1.6105
1.7272
1.8144
:
:
:
:
:
<Conc.
>
<%
>
<A+Bx+Cx2
>
Table Coefficient
<x<-d-R >
Enter the number corresponding to
the number of data pairs to be
entered (e.g. 9 in this example). Up
to 30 data pairs can be entered.
< Result >
Data No. (3-30) : [ 9]
Enter Conc.Table: [Execute]
Exit
: [Execute]
Method 0 < Conc.Table >
No.
Conc.
Density
1
[10.0000]
[ 1.06610]
2
[20.0000]
[ 1.13980]
3
[30.0000]
[ 1.21910]
4
[40.0000]
[ 1.30280]
Edit
Clear
Get Para.
Exit
Method 0 < Conc.Table >
No.
Conc.
Density
6
[60.0000]
[ 1.49870]
7
[70.0000]
[ 1.61050]
8
[80.0000]
[ 1.72720]
9
[90.0000]
[ 1.81440]
Edit
Clear
Get Para.
Exit
METTLER TOLEDO DE40/50/51 Density Meter
.
Select "Edit" with the → key.
Confirm with <ENTER>.
Enter the data pairs according to the
table.
.
Enter all other data pairs according
to the table.
Select "Get Parameter" with the →
key. Confirm with <ENTER>.
39
Calculation parameters
< Get Parameter >
[A+Bx+Cx2
]Conc
A: 5.199161x101
B: 1.054394x102
C:-3.253848x101
The results of the calculation are
shown and can be printed.
R: 1.419311
x
Constants used
The A, B and C values are the coefficients of the selected function. The R value is the mean
value of all the entered density values. The instrument replaces the density values with the
density minus mean value (x←d-R) to optimize the algorithm used (compute lower values).
Note: these A, B, C and R values can be used to input the concentration function directly
without having to enter the table again.
In this case R is the mean value of all density values and (x←d-R) should be
selected as "Data Replace" for the function.
Now your density meter has been programmed to measure the concentration of sulfuric acid.
Insert an aqueous solution of sulfuric acid into the measuring cell. After pressing
<MEASURE>, the following values will be displayed:
0.Method-0
Temp.(°C)
01-01
Conc.(%)
Set 20.00
Cell 20.00
23.5176
Measuring
0.Method-0
Temp.(°C)
01-01
Conc.(%)
Set 20.00
Cell 20.00
23.5
Result
40
During the measurement the
temperature and the concentration
are displayed.
At the end of the measurement the
final result (sulfuric acid
concentration) will be displayed.
Note: you can select the number of
decimal places under "Calc.
Para.-Decimals".
METTLER TOLEDO DE40/50/51 Density Meter
Calculation parameters
9.3
Temperature compensation
This section describes how to set the temperature compensation. It allows to measure the
sample at one temperature and compensate the result to another temperature. There are
three main applications which use this temperature compensation:
- The sample is to viscous to be introduced into the measuring cell or even solid (e.g. paraffin).
Therefore you need to heat the sample up to get it liquid enough to introduce it into the
measuring cell (e.g. 60 °C) but you want to get the density at 15 °C.
Note: for one special application there is already an Application Memory Card available
which allows to measure OIL products at any temperature and get the density at
15 °C or 60 °F. See section 14.1 "API software" for more information.
- Speed up the measurement. For example, if your sample comes at 40 °C and you have to
get the density at 20 °C you can set the measuring temperature to 40 °C and compensate
the result to 20 °C (provided you know the slope of the density against temperature of your
specific sample).
- The reference temperature is out of the instrument range. For example if you have to get the
density at 100° C (maximum measuring temperature of the DE50 is 70 °C). You can set the
measuring temperature to 70 °C and compensate the result to 100 °C (provided you know
the slope of the density against temperature of your specific sample).
Press the <Calc.Para> key.
Method 0
< Calc.Parameter >
Select "3.Temperature Compensation". Confirm with <ENTER>.
0.Density
1.Result
2.Temperature Compensation
3.Decimals
Method 0
< Temp.Comp>
Temp.Comp.
Exit
Method 0
Select "On" with the → key. Confirm
with <ENTER>.
: Off
On
:[Execute]
< Temp.Comp>
Temp.Comp.
Comp.Temp.
Temp.Formula
Parameter Set
Data No.(2-30)
: Off
On
:[ 20.00]°C
:<A+Bx
>
:Table
Coefficient
: 20]
METTLER TOLEDO DE40/50/51 Density Meter
Enter the temperature at which you
want to have the result.
41
Calculation parameters
There are two ways to program a temperature compensation function, either by entering this
function directly (provided that this function is already known) or by entering a temperature
compensation table (data pairs of temperature and corresponding density). See previous
section 9.2 Result:
Case 1: Direct input of concentration function
For input of temp.comp. function
Case 2: Input of concentration table
For input of temp.comp. table
9.4
Decimals
This section describes how to set the decimals for your results (d, concentration).
Press the <Calc.Para> key.
Method 0
< Calc.Parameter >
Select "3.Decimals". Confirm with
<ENTER>.
0.Density
1.Result
2.Temperature Compensation
3.Decimals
Method 0
Density
Conc.
Brix
Alcohol
Exit
< Decimals >
(0-5):[5]
(0-5):[5]
(0-3):[3]
(0-3):[3]
:[Execute]
Enter the number of decimals for the
density (d) respectively specific
gravity: d(t/t), d(t/4).
Enter the number of decimals for the different other options:
Conc:
Concentration (must have been previously selected under Calc.Para-Result)
BRIX:
Sugar concentration (must have been previously loaded with the Application
Memory Card and selected under Calc.Para-Result)
Alcohol:
Ethanol concentration (must have been previously loaded with the Application
Memory Card and selected under Calc.Para-Result)
Note: The measured values will be displayed and printed out according to the selected
settings.
42
METTLER TOLEDO DE40/50/51 Density Meter
Functions
10.
Functions (password protected)
10.1
Data File (Function 0)
This function allows to view and process the measured data. You can either do a
recalculation of measured results, statistics on the results or delete single data i.e. mark
them so that they are not considered in the statistics calculations. You can also save these
measured data on a Data Memory Card or load them from such a card for recalculation.
Select Function "0.Data File" and
< Function >
confirm with <ENTER>.
0.Data File
5.Set Check
1.Sample File
6.Periodic
The measured data are displayed,
2.Method File
7.Auto Start
together with the method and result
3.Changer
8.CARD utility
4.Factor
9.Memory Clear
type:
- d : density
< Data File >
- dt : specific gravity (d(t/t)
No. M.Name
Sample
Result
.
- d4 : specific gravity (d(t/4)
0 Method-0
01-01 d
0.99820
1 Method-0
01-02 d
0.99819
- C : concentration
2 Method-1
02-01 Br 10.81
- Br : BRIX
3 Method-1
02-02 Br 10.82
- Al : ALCOHOL
Statis. Recalc.
Load Save Exit
Now select with the ← and → keys between <Statistics>, <Recalc.>, <Load> and <Save>
and confirm with <ENTER>.
Note 1: If you have many data stored, press 0 to display the first 4 data (0 to 3), and 1 to 9
to display the next blocks of data (10 to 13, 20 to 23, ... 90 to 93).
Note 2: The <Load> and <Save> options require a Data Memory Card. These options are
described separately in section 12."Data Memory Cards".
10.1.1 Statistics
The function allows to process and view the measured data statistically. You can calculate
the mean value (Mean), the standard deviation (SD) and the relative standard deviation
(RSD). The relative standard deviation is the same as the coefficient of variation (CV).
The measured data can be filtered so that useful statistical results can be obtained after a
days work. On the first level the method will give access to the respective data only. On the
second level the series number (first two-digit number of the sample number) can be chosen
for which the statistics is to be done.
Note:
If too many filters are activated it is possible that all results are excluded.
METTLER TOLEDO DE40/50/51 Density Meter
43
Functions
< Data File >
No. M.Name
Sample
0 Method-0
01-01 d
1 Method-0
01-02 d
2 Method-1
02-01 Br
3 Method-1
02-02 Br
Statis. Recalc.
Load
Result
.
0.99820
0.99819
10.81
10.82
Save Exit
< Statistics >
Result
:<Brix
Method No.
:<Off>
Method Name
:<Off>
High Sample No. :<Off>
Data Print
:<Off >
Statistics
:[Execute]
>
< Statistics Result >
Results
Mean
SD
RSD
Exit
After selecting <Statis.> and confirmation with <ENTER>, you can
select the filter to process only the
desired results: result, method no,
method name, high sample no.
Select the desired filter to be "On"
using the → key.
Now you select whether the
statistics results are to be printed
alone (Data Print "Off") or together
with a list of all the measured values
(Data Print "On").
:
4
:
10.82 %
:
0.06 %
:
0.54 %
:[Execute]
The statistics is now shown on the
display.
<Statistics>
Date : 29/06/1998 17:29
Sample No.(High) : 01
Method No. : 2
To print the results of the statistics
calculation press the <PRINT> key.
Results:
Mean
:
SD
:
RSD
:
4
10.82 %
0.06 %
0.54 %
Select Exit : [Execute] and confirm
with <ENTER> to exit.
Name : Quality Lab 1
----------------
10.1.2
Recalculation
This function allows to recalculate single measured values. Before you do this you have to
change the calculation formula (or calculation table) in the respective method to the desired
one (like density to BRIX, shown in this example). When you now enter the recalculation
menu the result will be shown directly according to the new calculation setting.
< Data File >
No. M.Name
Sample
11 Method-5
01-01 d
12 Method-5
01-02 d
13 Method-6
02-01 Br
14 Method-6
02-02 Br
Statis. Recalc.
Load
44
Result
.
1.03981
1.03980
10.81
10.82
Save Exit
Select the data to be recalculated
with the <UP> and <DOWN> keys.
Select Recalc. with the ← and →
keys and confirm with <ENTER>.
METTLER TOLEDO DE40/50/51 Density Meter
Functions
0.Method-5
Temp.(°C)
01-02
Density(g/cm3)
Press the <CALC.PARA> key.
1.03980
Set 20.00
Cell 20.00
Recalculation
Recalc.
< Calc.Parameter >
0.Density
1.Result
2.Temperature Compensation
3.Decimals
Recalc.
Result
Exit
< Result >
:<Brix
:[Execute]
>
Select "1.Result" and confirm with
<ENTER>
Select Brix with the → key and
confirm with <ENTER>
Select Function 0.Data File again
< Data File >
No. M.Name
Sample
11 Method-5
01-01 d
12 Method-5
01-02 Br
13 Method-6
02-01 Br
14 Method-6
02-02 Br
Statis. Recalc.
Load
10.1.3
Result
.
1.03981
10.40
10.81
10.82
Save Exit
The recalculated result is shown
(from density to BRIX)
Data Deletion
This function allows to exclude single measured values from the statistics calculation by
marking them with an asterisk (they are not deleted from the list).
< Data File >
No. M.Name
Sample
1 Method-0
01-01 d
2 Method-0
01-02 Br
3 Method-0
01-03 Br
4 Method-0
01-04 Br
Statis. Recalc.
Load
< Data File >
No. M.Name
Sample
1 Method-0
01-01 d
* 2 Method-0
01-02 Br
3 Method-0
01-03 Br
4 Method-0
01-04 Br
Statis. Recalc.
Load
Result
.
10.81
8.40
10.81
10.82
Save Exit
Result
.
10.81
8.40
10.81
10.82
Save Exit
METTLER TOLEDO DE40/50/51 Density Meter
Select the data to be excluded with
the <UP> and <DOWN> keys.
Exclude this data by pressing the
<DISPLAY> key.
The excluded data is marked with an
asterisk.
45
Functions
Now you can resume the statistics calculation again and then print the results without the
marked measurements. If you selected the data print "On" the excluded measurements will
be printed with an asterisk before the sample number.
10.2
Sample File (Function 1)
This function is used normally when the instrument is operated in connection with a sample
changer.
It is automatically set to ON when a
< Sample File >
Sample Changer has been selected
Sample File : Off On
(see Function 3).
Exit
: [Execute]
It can also be used without Sample Changer to run standard measurements always in the
same sequence. See also section 6.1 "Sample File" for more information.
10.3
Method File (Function 2)
This function is used together with a Data Memory Card to save and load a method file.
< Method File >
No.
Name Temp.(°C)
Result
0. ORANGE
20.0
d
1. GRAPE
20.0
d
2. LEMON
20.0
d
3. APPLE
20.0
d
Load
Save
Exit
10.4
.
See section 12. "Data Memory
Cards" for more information.
Changer (Function 3)
Here you can define the connected sample changer (SC24 or CHG-241) or auto sampling
unit DCU-300.
Press function 3 (Changer) and confirm with <ENTER>.
< Changer >
Changer
Exit
: <SC24
>
: [Execute]
Choose the desired equipment using
the → key:
None, DCU-300, SC24, SOP40,
SOP50 or CHG-241. Confirm with
<ENTER>.
When choosing the SC24 you can define whether the measuring series is started with a
calibration (On) or not (Off).
Note: Select CHG-241 if you connect a CHG-260.
46
METTLER TOLEDO DE40/50/51 Density Meter
Functions
< Changer >
Changer
Calib.
Start Position
Exit
:
:
:
:
<SC24
>
Off On
Home Current
[Execute]
< Changer >
Changer
Calib.
Start Position
Exit
10.5
:
:
:
:
<SC24
>
Off On
Home Current
[Execute]
Selecting Calib. "On" means that in
the starting position there has to be
a vial with deionized water, and that
sample vials are placed after
this position. When pressing
<MEASURE> the instrument will
first perform a calibration with air
and water. Only after this will the
sample measurement be done.
Here you can define the starting
position on the turntable. You can
select that measurements are
started at "Home" (number 1 on the
turntable) or "Current" (the actual
position on the turntable). Confirm
with <ENTER>.
Factor (Function 4)
If you know the period of oscillation T and the density of air and water for a particular
temperature, you can enter these values here manually for the calculation of the factor.
Temp.
Air T/d
Water T/d
Correct
Factor
Exit
10.6
< Factor >
:[ 20.00]°C
:[ 845401]/[ 0.00120]
:[ 1086417]/[ 0.99821]
:[Execute]
:[ 2.141349]
:[Execute]
Set check (Function 5)
In this function you can set up define the substances - name, rated value and allowed
tolerances - you want to use as standard check samples either for the daily or the periodic
check.
Select function 5 - Set Check - and confirm with <ENTER>.
< Set Check >
Check
Standard
Ref.Value
Tolerance
Exit
:Daily
Periodic
:[Fl. Carbon ]
:[
1.94796]g/cm3
:[
0.00004]g/cm3
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
With the ← and → keys select either
"Daily" or "Periodic" and confirm with
<ENTER>.
47
Functions
10.6.1
Daily Check
This check is used mainly to control the working condition of the instrument. Is the instrument
really clean and dry? Did the previous operator really clean the cell after measuring his sample?
Pressing the Check key will always activate a daily check, unless a periodic check is due (see
also section 10.7).
Normally deionized or bi-distilled water is used for this purpose. Of course any other solution
can be used that suites the purpose i.e. is readily and in abundance available as well as has
a stable and well known composition.
This example uses water as daily
< Set Check >
check solution.
Check
:Daily
Periodic
The results of this daily check are
Standard
:[Water
]
not stored in the instrument. They
Ref.Value
:[
0.99821]g/cm3
Tolerance
:[
0.00008]g/cm3
are just meant to check whether the
Exit
:[Execute]
instrument is really ready for the
next measurement.
10.6.2
Periodic Check
This check is used mainly to verify whether a new adjustment of the instrument is necessary
or not. Every adjustment of the instrument means that the instrument settings are changed.
This can be dangerous if it is not done correctly because all the measurements afterwards
will be wrong.
Pressing the check key will start a periodic check only when such a test is due according to
the settings in section 10.7.1. When no periodic check is due it will start a daily check.
So instead of actually performing frequent adjustments we suggest to perform frequent
checks with an exactly known standard solution. As long as this periodic check is done
successfully, there is no need to adjust the instrument. The results of periodic check are read
automatically in the instrument. Should the periodic check fail, the operator should carefully
clean and dry the measuring cell and then repeat the periodic check. If it still fails, then the
instrument should be adjusted again: press the <Calib.> key and follow the instructions of the
instrument.
If the periodic check fails too often even after re-adjusting the instrument - like every second
or third time - then you should contact your local supplier for servicing and closer support.
< Set Check >
Check
Standard
Ref.Value
Tolerance
Exit
48
:Daily
Periodic
:[Toluene
]
:[
0.86683]g/cm3
:[
0.00002]g/cm3
:[Execute]
This example uses toluene as
periodic check solution.
The results of this periodic check are
stored in the instrument. They can be
retrieved under Function "6. Periodic"
and "Show Check List".
METTLER TOLEDO DE40/50/51 Density Meter
Functions
We recommend to use our certified density standards for a periodic instrument check:
ME-51338002 Water
0.99... g/cm3 +/- 0.00001
ME-51338003 Beverage syrup
1.04... g/cm3 +/- 0.00010
ME-51338004 Dichlorotoluene
1.26... g/cm3 +/- 0.00002
ME-51338005 Fluorocarbon
1.95... g/cm3 +/- 0.00002
10.7
Periodic (Function 6)
This function is used to set the intervals of the periodic adjustment (calibration) as well as the
periodic check. This function is also used to display and print the last adjustment data and
check data stored in the instrument.
10.7.1
Periodic Check
Select function 6 "Periodic" and confirm with <ENTER>.
< Periodic>
Periodic
:Check Calib.
Next Check Date :19/07)1998
Check Alarm
:Off On
Check Interval
:[ 7]day
Show Check List :[Execute]
Exit
:[Execute]
The display will show the due date
for the next periodic check. This due
date is calculated automatically by
the instrument according to following
settings. Confirm with <ENTER>.
< Periodic>
Periodic
:Check Calib.
Next Check Date :19/07)1998
Check Alarm
:Off On
Check Interval
:[ 7]day
Show Check List :[Execute]
Exit
:[Execute]
Select the periodic check (Check
Alarm) to be "On" or "Off", and
confirm with <ENTER>.
If "On" is selected, the instrument will give one of the following messages when it is turned
on: "X Days To Check" as a remainder, "Check Day" on the due date, and "Check Day Over!"
on the following days. Each of these displays will return to the "Ready" display after a while.
If "Off" is selected, the periodic check is not active i.e. whenever you press check, a daily
check is performed.
While running the instrument will not display a message, but pressing the Check key will start
a periodic check.
< Periodic>
Periodic
:Check Calib.
Next Check Date :19/07)1998
Check Alarm
:Off On
Check Interval
:[ 7]day
Show Check List :[Execute]
Exit
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
Enter the check interval (in days)
and confirm with <ENTER>
Note: Enter 0 Day to force a periodic
check on today's date. This will
especially be required if the periodic
check has failed, in order to perform
it again.
49
Functions
Select Show Check List Execute to
display the list of the last 10 checks
performed
The whole list can be printed
pressing the <PRINT> key.
< Periodic>
Periodic
:Check Calib.
Next Calib.Date :19/07)1998
Check Alarm
:Off On
Check Interval
:[ 7]day
Show Check List :[Execute]
Exit
:[Execute]
No.
10
9
8
7
6
Date
13/07
6/07
29/06
22/06
15/06
Date
Standard
Temp.
Ref.Value
Meas.Data
Exit
< Show Check List >
Ref.Value
Meas.
0.86683
0.86686
0.86683
0.86685
0.86683
0.86684
0.86683
0.86684
0.86683
0.86682
< Show Check List >
:13/07/1998
:TOLUENE
: 20.00 °C
: 0.86683 (+- 0.00002)
: 0.88686 (NG)
:[Execute]
.
NG
OK
OK
OK
OK
The results of such a periodic check
are automatically stored in the
instrument. You can view the last 10
checks performed.
Select the data you are interested in
and press <ENTER> to get the full
data dispayed.
10.7.2 Periodic Adjustment (Calibration)
The instrument has to be adjusted from time to time. You can either choose the time
according to your special needs i.e. perform it when the periodic check fails for example two
times successively, or you can define a certain time period after which the instrument will
remind you to repeat the adjustment.
The results of these adjustments will automatically be stored by the instrument. You can view
at any time the last 10 adjustments performed and also print out the list for documentation
purposes as described below.
Select function 6 "Periodic Calib." and confirm with <ENTER>.
50
< Periodic>
Periodic
:Check Calib.
Next Calib.Date :19/07)1998
Calib.Alarm
:Off On
Calib.Interval
:[ 7]day
Show Calib.List :[Execute]
Exit
:[Execute]
The display will show the due date
for the next periodic adjustment.
This due date is calculated
automatically by the instrument
according to following settings.
Confirm with <ENTER>.
< Periodic>
Periodic
:Check Calib.
Next Calib.Date :19/07)1998
Calib.Alarm
:Off On
Calib.Interval
:[ 7]day
Show Calib.List :[Execute]
Exit
:[Execute]
Select the periodic adjustment
(Calib. Alarm) to be "On" or "Off",
and confirm with <ENTER>.
METTLER TOLEDO DE40/50/51 Density Meter
Functions
If "On" is selected, the instrument will give one of the following messages when it is turned on:
"X Days to Calib" as a remainder, "Calib. Day" on the due date, and "Calib. Day Over!" on the
following days. Each of these displays will return to the "Ready" display after a while.
If "Off" is selected, the instrument will not remaind you to readjust.
< Periodic>
Periodic
:Check Calib.
Next Check Date :19/07)1998
Calib. Alarm
:Off On
Calib.Interval
:[ 7]day
Show Calib.List :[Execute]
Exit
:[Execute]
Enter the adjustment interval (in
days) and confirm with <ENTER>.
< Periodic>
Periodic
:Check Calib.
Next Calib.Date :19/07)1998
Calib.Alarm
:Off On
Calib.Interval
:[ 7]day
Show Calib.List :[Execute]
Exit
:[Execute]
Select Show Calib.List Execute to
display the list of the last 10
adjustments performed.
No.
10
9
8
7
6
Date
13/07
6/07
29/06
22/06
15/06
Date
Temp.
Air
Water
Factor
Exit
10.8
< Show Calib.List >
Temp.(°C)
Factor
20.00
2.142349
20.00
2.142342
20.00
2.142337
20.00
2.142338
20.00
2.142335
< Show Calib.List >
:13/07/1998
: 20.00 °C
:T=
845401 d= 0.00120
:T= 1086417 d= 0.99821
: 2.142349 (OK)
:[Execute]
Note: Enter 0 Day to force a periodic
adjustment on today's date.
.
OK
OK
OK
OK
OK
The results of such a periodic
adjustment are automatically stored
in the instrument. You can view the
last 10 adjustments performed.
Select the data you are interested in
and press <ENTER>.
By pressing the print key the whole
list is printed.
Auto Start (Function 7)
This function is used mainly for repetitive measurements in one sample. It can not be turned
on when there is a connection to a sample changer or to a DCU.
< Auto Start >
Auto Start
Exit
:Off On
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
Press <Function> 7 and confirm with
<ENTER>.
Select "On" or "Off" and confirm with
<ENTER>.
51
Functions
< Auto Start >
Auto Start
Interval Time
Meas.Times
Exit
:Off On
:[
10]min
:[ 0]
:[Execute]
When you have chosen "On", you
can define the time interval between
two measurements. Confirm with
<ENTER>. Enter 0 to start the next
measurement imme-diately after the
end of the actual measurement (no
time interval).
In "Meas. Times" you define the number of repetitive measurements to be performed with
this sample. Enter 0 for continuous measurement. In this case press Reset to stop the
measurements.
10.9
CARD Utility (Function 8)
This function is used together with the Memory Cards.
< CARD Utility >
0.Data Delete
5.Table Capacity
1.Sample Delete
6.Install Table
2.Method Delete
7.Uninstall Table
3.Format
4.CARD Information
See section 12 "Data Memory Cards" and section 13 "Application Memory Cards" for more
information.
52
METTLER TOLEDO DE40/50/51 Density Meter
Functions
10.10
Memory Clear (Function 9)
This function is used to reset all parameters to default (factory setting), for instance to
initialize the memory after a serious malfunction of the instrument.
You can also selectively reset single records like the adjustment data (Calib. data), the check
records, the sample files or the method parameters.
< Memory Clear >
0.Measured Data
1.Sample File
2.Periodic Check
3.Periodic Calib.
4.Method Parameter
5.All Parameter
< Measured Data Clear >
Clear Execute ?
No
Yes
Press <Function> 9 and confirm with
<ENTER>.
Select the desired option:
"Measured Data", "Sample File",
"Periodic Check", "Periodic Calib.",
"Method Para.", "All Parameter", and
confirm your choice with <ENTER>.
Select "Yes" to confirm your choice
again and press <ENTER>.
The chosen data or parameters are now deleted and the respective factory settings are
active again.
Note:
The function "5. All Parameter" doesn't delete any downloaded special application
tables (from flash memory cards).
METTLER TOLEDO DE40/50/51 Density Meter
53
Setup
11.
Setup (password protected)
11.1
Interface (Setup 0)
This option is used to define the RS-232C serial interface and the serial printer.
Press the <SETUP> key.
Select "0.Interface". Confirm with
<ENTER>.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
Select "Printer" with the → key in
order to setup the printer or
"RS-232C" to define the serial
interface.
< Interface >
0.RS-232C
1.Printer
11.1.1 RS-232C Interface setup
This option is used to setup the RS-232C interface either for connecting a computer or for
connecting a RE40 or RE50 refractometer for simultaneous measurement of refractive index
and density (or specific gravity). In both cases you have to make sure that the other
equipment (computer or RExx) is setup with the same values.
< RS-232C >
Baud Rate
Parity
Stop Bits
Data Bits
Exit
:<4800>
:Even Odd
:1 2
:7 8
:[Execute]
None
Select the following values according to your computer setup or to your RE40 resp. RE50
setup. In case you connect a RExx refractometer, use "Setup 0: Interface" at the
refractometer to make sure that both setups are identical.
54
METTLER TOLEDO DE40/50/51 Density Meter
Setup
11.1.2 Printer setup
We recommend to select the GA42 printer from METTLER TOLEDO. Make sure that the DIP
switch 2 is ON on the GA42 printer.
< Printer >
Printer
Exit
:IDP- DP:[Execute]
GA-
Other
The following printers are predefined:
GA-: for GA42 and SPRINTER printer from METTLER TOLEDO.
Other: for all serial printers. Selection of:
- Baud rate (300, 600, 1200, 2400,....)
- Parity (none, even, odd)
- Stop bits (1, 2)
- Data bits (7, 8)
These parameters have to be set according to the specifications of
your printer.
The bold settings are active for the GA42 printer.
IDP-: not used
DP-:
not used
11.2
Date and Time (Setup 1)
This option is used to enter the actual date and time.
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Date & Time >
12/07/1998
Day
:[12]
Month :[ 7]
Year :[1998]
17:12
Hour
:[17]
Minutes :[12]
Exit
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
Select "1.Date&Time". Confirm with
<ENTER>.
Actual date and time are displayed.
Press <ENTER> key.
Enter date and time (the date format
is selected in the menu Setup
„5.International”) and confirm with
<ENTER>.
55
Setup
11.3
Name (Setup 2)
This option is used to enter the laboratory name (or company or operator).
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Name >
Name
:[Quality Lab 1
Exit
:[Execute]
11.4
Select "2.Name". Confirm with
<ENTER>.
A
]
The capital A means that the
alphanumerical keyboard is in entry
mode for capital letters. Press the
<DISPLAY> key to change the entry
mode:
A: capital letters (A, B, C, D, ..)
a: small letters (a, b, c, d, ...)
1: numbers (0, 1, 2, 3, 4, ...)
Serial/Version number (Setup 3)
This option is used to identify the software version and the serial number of your instrument
without having to switch off the instrument.
- Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Serial No./Version No.>
Serial No.
Version No.
:
:
Select "3.Serial/Version".
xxxxxxxx
x.xx
Press the <ENTER> key. The serial
number of your instrument as well
as the software version are
displayed.
[Exit]
56
METTLER TOLEDO DE40/50/51 Density Meter
Setup
11.5
LCD Contrast (Setup 4)
This option is used to adjust the contrast of the LCD display in your instrument.
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< LCD Contrast >
Light
<| |
11.6
|
|
|
Center
| |
|
|
|
Dark
|>
Select "4.LCD Contrast".
Confirm with <ENTER>.
Select the LCD contrast with the ←
and → keys. Confirm with
<ENTER>.
International (Setup 5)
This option is used to select the date format and the unit for the temperature.
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< International >
Date
Temp.Unit
Exit
:<DD/MM/YYYY>
:°C °F
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
Select "5.International".
Confirm with <ENTER>.
Select your date format with the →
key:
YYYY: Year
MM : Month
DD : Day
Select your temperature unit with the
→ key: °C : degree Celsius
°F : degree Fahrenheit
57
Setup
11.7
Lock with password (Setup 6)
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Password Lock >
Password Lock
Password
Confirm Password
Lock Execute
:Off
On
:[********]
:[********]
:[Execute]
Select "6.Lock".
Confirm with <ENTER>.
Select "On" with the → key.
Confirm with <ENTER>.
Enter your password. Make sure to
keep it in a safe place in case you
would forget it.
Enter your password a second time
to confirm the correct spelling.
In case you would have forgotten your password you will need to call the METTLER
TOLEDO service.
11.8
Beep (Setup 7)
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Beep >
Beep
Beep Type
Exit
58
:Off
On
:<Type1>
:[Execute]
Select "7.Beep".
Confirm with <ENTER>.
Select "On" with the → key.
Confirm with <ENTER>.
Enter your beep selection:
Type1: long and fast
Type2: long and slow
Type3: short and fast
Type4: short and slow
METTLER TOLEDO DE40/50/51 Density Meter
Setup
11.9
Temperature calibration (Setup 8)
Press the <SETUP> key.
< Setup >
0.Interface
1.Date & Time
2.Name
3.Serial/Version
4.LCD Contrast
5.International
6.Lock
7.Beep
8.Temperature
< Temperature >
0.Calibration
1.Adjust
Select "8.Temperature".
Confirm with <ENTER>.
Select either "1.Adjust" (single point)
or "0.Calibration" (multiple point over
the hole temperature range).
Confirm with <ENTER>.
Adjust:
Performs a one-point adjustment at the measuring temperature (correcting the offset).
Select this option when the difference between Set Temperature and Cell Temperature is
less than 0.5 °C (in equilibrium).
Calibration:
Performs a multiple point adjustment, in steps of 5 °C, over the entire temperature range.
Select this option when the difference between Set Temperature and Cell Temperature is
0.5 °C or higher (in equilibrium). This temperature calibration takes approximately two hours!
This temperature calibration will adjust the internal thermistors to the certified thermistor in
the measuring cell over the whole temperature range.
METTLER TOLEDO DE40/50/51 Density Meter
59
Data Memory Card
12.
Memory Cards (DE40, DE50 and DE51)
The following two sections describe the use of the memory cards. There are two types of
memory cards to be used with the DE40, DE50 and DE51 density meters:
Data Memory Card:
SRAM cards.
For measurement data, methods and sample files (ME-51324004).
Application Memory Card: FLASH cards.
For the following applications:
• ALCOHOL
• BRIX
• API
• VISCOSITY CORRECTION
• CONCENTRATION TABLES
12.1
(ME-51324000)
(ME-51324001)
(ME-51324002)
(ME-51324003)
(ask your local representative)
Data Memory Cards: data, methods, sample files
These Data Memory Cards are SRAM cards, have a capacity of 1 MB and use a lithium
battery. The cards are used to store measurement data, methods or/and sample files. You
can store up to:
982 Methods (if only methods are stored),
498 Sample files (if only sample files are stored),
10 Data files, each file containing up to 100 data (if only data files are stored).
If you store a combination of methods, sample files and data files the number of available
free space will decrease. In order to see how much free space is available, perform following
steps:
Press the <FUNCTION> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
< CARD utility >
0.Data delete
5.Table Capacity
1.Sample delete
6.Install Table
2.Method delete
7.Uninstall Table
3.Format
4.CARD Information
60
Select “8.CARD utility”. Confirm with
<ENTER>
Insert a Data Memory Card into the
slot on the front left part of the
instrument.
Select “4.CARD Information”.
Confirm with <ENTER>.
METTLER TOLEDO DE40/50/51 Density Meter
Data Memory Card
< Card Information >
Type
Used
Unused.
Method File
:
[
0] [ 982]
Sample File
:
[
0] [ 498]
Meas.Data File :
[
0] [ 10]
[Exit]
12.2
Save measured data
With the Data Memory Card you can save data on the card or load data from the card. The
DE40, DE50 and DE51 store up to 100 measurement data in the internal memory. These
data can be saved on a memory card as one single data file. Let’s assume that you have
already performed 35 measurements.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
Select “0.Data File”. Confirm with
<ENTER>.
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
< Data File >
No.
M.Name
Sample
Result .
32 ORANGE
01-10 d
1.0326
33 GRAPE
02-01 d
1.0024
34 GRAPE
02-02 d
1.0025
35 GRAPE
02-03 d
1.0024
Statis. Recalc. Load Save Exit
Note:
If you have many data stored, press 0 to display the first 4 data (0 to 3), and 1 to 9 to
display the next blocks of data (10 to 13, 20 to 23, ... 90 to 93).
Insert a Data Memory Card into the slot on the front left part of the instrument.
Select “Save” with the → key. Confirm with <ENTER>.
< Save Data File >
File Name
: [WEEK24 ]
Save Execute : [Execute]
Exit
: [Execute]
Enter the name under which you
want to store the measurement data
(max. 8 characters).
Note: Blank spaces are not allowed.
Press <ENTER> twice (confirm
Save Execute and Exit).
METTLER TOLEDO DE40/50/51 Density Meter
61
Data Memory Card
< Save Data File >
Wait until all data have been saved.
Now Saving ...
File save is complete
Press <ENTER>.
[ OK ]
Your data are now saved on the memory card, you can clear the internal memory of the
instrument (see next section).
12.3
Clear measured data
Let’s assume that you have saved the previously performed 35 measurements (previous
section). Once your data are saved on the memory card you can clear the internal memory of
the instrument.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “9.Memory Clear”. Confirm
with <ENTER>.
Select “0.Measured Data”. Confirm
with <ENTER>.
< Memory Clear >
0.Measured Data 4.Method Parameter
1.Sample File
5.All Parameter
2.Periodic Check
3.Periodic Calib.
< Memory Data Clear >
Clear Execute ?
62
No
Yes
Select “Yes” with the → key. Confirm
with <ENTER>.
A beep sound will indicate that the
memory has been cleared.
METTLER TOLEDO DE40/50/51 Density Meter
Data Memory Card
12.4
Load measured data
This may be used for example to recalculate some results you have already stored on a
Memory Card. Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
No.
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
< Data File >
M.Name
Sample
Result
Data not exist.
Exit
Load
< Load Data File
File Name
Date
WEEK24
06/12/1998
WEEK23
06/05/1998
WEEK22
05/29/1998
WEEK21
05/22/1998
WEEK20
05/15/1998
>
Time
18:02
18:14
17:25
17:45
18:25
< Load Data File >
File will be loaded.
Select “0.Data File”. Confirm with
<ENTER>.
Insert the Data Memory Card with
the previously stored data into the
slot on the front left part of the
instrument.
Select “Load”. Confirm with
<ENTER>.
Select the Data File you want to load
with the <UP> and <DOWN> keys.
Confirm with <ENTER>.
Select “Yes” with the → key.
Confirm with <ENTER>.
OK ?
No
Yes
< Load Data File >
Wait until the data file has been
loaded.
Now Loading ...
File load is complete
Press <ENTER>.
[ OK ]
METTLER TOLEDO DE40/50/51 Density Meter
63
Data Memory Card
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
You can now display the loaded
data. Press the <FUNC> key.
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
< Data File >
No.
M.Name
Sample
32 ORANGE
01-10 d
33 GRAPE
02-01 d
34 GRAPE
02-02 d
35 GRAPE
02-03 d
Statis. Recalc. Load
Result .
1.0326
1.0024
1.0025
1.0024
Save Exit
Select “0.Data File”. Confirm with
<ENTER>.
Note:
if you have many data stored, press 0 to display the first 4 data (0 to 3), and 1 to 9 to
display the next blocks of data (10 to 13, 20 to 23, ... 90 to 93).
12.5
Save method
With the Data Memory Card you can save methods on the card or load methods from the
card. The DE40, DE50 and DE51 store up to 10 methods in the internal memory. These
methods can be saved on a memory card and transferred to another instrument. This is
especially useful to develop a method in a central laboratory and once this method has been
validated to distribute it to all other laboratories.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
< Method File >
No.
Name Temp.(°C)
Result
0. ORANGE
20.0
d
1. GRAPE
20.0
d
2. LEMON
20.0
d
3. APPLE
20.0
d
Load
Save
Exit
< Save Method File >
File Name
: [GRAPE
]
Save Execute : [Execute]
Exit
: [Execute]
Select “2.Method File”. Confirm with
<ENTER>.
.
Select the method you want to save
with the <UP> and <DOWN> keys.
Select “Save” with the → key.
Confirm with <ENTER>.
Enter the name under which you
want to store the method (max. 8
characters).
Press <ENTER> twice (confirm
Save Execute and Exit).
64
METTLER TOLEDO DE40/50/51 Density Meter
Data Memory Card
< Save Method File >
Wait until method has been saved.
Now Saving ...
Press <ENTER>.
File save is complete
[ OK ]
12.6
Clear internal method
Let’s assume that you have saved the previously defined methods (previous section). Once
your methods are saved on the memory card you can clear the internal memory of the
instrument.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
Press the <FUNC> key.
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “9.Memory Clear”. Confirm
with <ENTER>.
< Memory Clear >
0.Measured Data 4.Method Parameter
1.Sample File
5.All Parameter
2.Periodic Check
3.Periodic Calib.
< Method Parameter Clear >
Clear Execute ?
No
Yes
METTLER TOLEDO DE40/50/51 Density Meter
Select “4.Method Parameter”.
Confirm with <ENTER>.
Select “Yes” with the → key.
Confirm with <ENTER>.
A beep sound will indicate that the
memory has been cleared.
65
Data Memory Card
12.7
Load method
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “2.Method File”. Confirm with
<ENTER>.
< Method File >
No.
Name Temp.(°C)
Result
0. Method-0
20.0
d
1. Method-1
20.0
d
2. Method-2
20.0
d
3. Method-3
20.0
d
Load
Save
Exit
First you have to select where you
want to load the method. Select the
method you want to overwrite with
the one to be loaded with the <UP>
and <DOWN> keys.
Select “Load” with the → key.
Confirm with <ENTER>.
< Load Method File >
File Name
Date
Time
GRAPE
06/12/1998
18:02
LEMON
06/05/1998
18:14
APPLE
05/29/1998
17:25
ORANGE
05/22/1998
17:45
SPRITE
05/15/1998
18:25
< Load Method File >
File will be loaded.
.
.
Select the method you want to load
with the <UP> and <DOWN> keys.
Confirm with <ENTER>.
Select “Yes” with the → key and
confirm with <ENTER>.
OK ?
No Yes
< Load Method File >
Wait until the method has been
loaded.
Now Loading ...
File load is complete
Press <ENTER>.
[ OK ]
66
METTLER TOLEDO DE40/50/51 Density Meter
Data Memory Card
< Method File >
No.
Name Temp.(°C)
Result
0. Method-0
20.0
d
1. ORANGE
20.0
d
2. Method-2
20.0
d
3. Method-3
20.0
d
Load
Save
Exit
< Method File >
No.
Name Temp.(°C)
Result
0. Method-0
20.0
d
1. ORANGE
20.0
d
2. Method-2
20.0
d
3. Method-3
20.0
d
Load
Save
Exit
12.8
.
.
Repeat the previous steps if you
want to load more methods, being
careful not to overwrite an already
defined method: select a free
method “Method-x” to be
overwritten.
Select “Exit” with the → key. Confirm
with <ENTER>.
Save sample file
With the Data Memory Card you can save sample files to the card or load sample files from
the card. The DE40, DE50 and DE51 store up to 498 sample files in the internal memory.
These sample files are usually used together with the sample changer, in order to run
samples according to a predefined sequence (sample names, method to be used, etc...).
They can also be used as a SOP (Standard Operating Procedure) if no sample changer is
connected. See section 6.1 for the description of sample files. Let’s assume that you have
already defined such a sample file.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “1.Sample File”. Confirm with
<ENTER>.
Select “On” with the → key. Confirm
with <ENTER>.
< Sample File >
Sample File
: Off
On
Exit
: [Execute]
< Sample >
Sample File
:Skip Load Save
Max.Meas.No.
:[ 24]
Next Meas.No.
:[ 1]
Method
:Current Variable
Set Parameter
:[Execute]
Exit
:[Execute]
METTLER TOLEDO DE40/50/51 Density Meter
Press the <SAMPLE> key.
Select “Save” with the → key.
Confirm with <ENTER>.
67
Data Memory Card
< Save Sample File >
File Name
: [COKE24 ]
Save Execute : [Execute]
Exit
: [Execute]
< Save Sample File >
Now Saving ...
Enter the name under which you
want to store the sample file (max. 8
characters).
Press <ENTER> twice (confirm
Save Execute and Exit).
Wait until:
Press <ENTER>.
File save is complete
[ OK ]
12.9
Clear internal sample file
Let’s assume that you have saved the previously defined sample file (previous section).
Once your sample file is saved on the memory card you can clear the internal memory of the
instrument.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “9.Memory Clear”. Confirm
with <ENTER>.
< Memory Clear >
0.Measured Data 4.Method Parameter
1.Sample File
5.All Parameter
2.Periodic Check
3.Periodic Calib.
< Sample File Clear >
Clear Execute ?
68
No
Yes
Select “1.Sample File”. Confirm with
<ENTER>.
Select “Yes” with the −> key.
Confirm with <ENTER>.
A beep sound will indicate that the
memory has been cleared.
METTLER TOLEDO DE40/50/51 Density Meter
Data Memory Card
12.10
Load sample file
< Sample >
Sample File
:Skip Load Save
Max.Meas.No.
:[ 24]
Next Meas.No. :[ 1]
Method
:Current Variable
Set Parameter :[Execute]
Exit
:[Execute]
Press the <SAMPLE> key.
< Load Sample File >
File Name
Date
Time
COKE24
06/12/1998
18:02
COKE10
06/05/1998
18:14
SPRITE24
05/29/1998
17:25
SPRITE10
05/22/1998
17:45
LIGHT24
05/15/1998
18:25
Select the sample file you want to
load with the <UP> and <DOWN>
keys. Confirm with <ENTER>.
< Load Sample File >
File will be loaded.
Select “Load” with the → key.
Confirm with <ENTER>.
.
Select “Yes” with the → key.
Confirm with <ENTER>.
OK ?
No Yes
< Load Sample File >
Now Loading ...
Wait until the sample file has been
loaded.
Press <ENTER>.
File load is complete
[ OK ]
METTLER TOLEDO DE40/50/51 Density Meter
69
Application Memory Card
13.
Application Memory Cards: BRIX, ALCOHOL, API, VISCOSITY
CORRECTION, USER TABLES
These Application Memory Cards are FLASH cards with a capacity of 2 MB. The cards are
used to download special applications to your instrument. Once the application has been
downloaded to the instrument it is removed from the Application Memory Card. In other
words the Memory Card is empty, but can still be used to retrieve the application from the
instrument, for example to transfer it to another instrument. Therefore make sure to keep the
empty Application Memory Card in a safe place.
Note:
The function "Memory Clear" "All Parameter" (in Function 9.5) doesn’t clear the
downloaded application.
13.1
How to download an application (Install table)
This section will show you how to download an application. Following Application Memory
Cards are available:
• ALCOHOL Alcohol concentration (Ethanol)
(ME-51324000)
• BRIX
Sugar concentration (Sucrose)
(ME-51324001)
• API
Petroleum products
(ME-51324002)
• VISCOSITY Viscosity correction
(ME-51324003)
• CONCENTRATION TABLES (ask your local representative)
Insert the Application Memory Card into the slot on the front left part of the instrument.
Press the <FUNC> key.
Select “8.CARD utility”. Confirm with
< CARD utility >
<ENTER>.
0.Data delete
5.Table Capacity
1.Sample delete
6.Install Table
2.Method delete
7.Uninstall Table
3.Format
4.CARD Information
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
Note:
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
The following shows the BRIX application. For other applications just replace BRIX
with your application (Alcohol, API, Viscosity correction, Concentration).
< Install Table >
Table Name Type
Brix
Conc.
Exit
70
Select “6.Install Table”. Confirm with
<ENTER>.
Temp.
20.00°C
Data.
85
Select the application to load with
the <UP> and <DOWN> keys.
Select “Install” with the −> key.
Confirm with <ENTER>.
Install
METTLER TOLEDO DE40/50/51 Density Meter
Application Memory Card
Wait until the installation has been
done.
< Install Table >
Now Install ...
Press <ENTER>.
Table install is complete
[ OK ]
< Install Table >
Table Name Type
Temp.
*Brix
Conc. 20.00°C
Exit
13.2
Data.
85
Install
The asterisk (*) on the left of the
application (BRIX) shows that this
application has been downloaded
and removed from the Memory
Card. This means that the Memory
Card is empty, but can still be used
to retrieve the application from the
instrument (uninstall table).
How to select the application
The application has been downloaded to the instrument. You need now to define which
method should be dedicated to this application.
Press <METHOD>.
< Method List >
No.
Name Temp.(°C)
Result
0. Method-0
20.0
d
1. Method-1
20.0
d
2. Method-2
20.0
d
3. Method-3
20.0
d
4. Method-4
20.0
d
Method 1 <Meas.Parameter>
Method Name
:[ORANGE]
Measurement Temp.:[ 20.00]°C
Stability (0-2) :[1]
Limit Time
:[ 600]s
Sequence
:Off On
.
Select the method you want to
dedicate to this application with the
<UP> and <DOWN> keys. Confirm
with <ENTER>.
Press the <MEAS.PARA> key.
Set the measurement parameters
according to your application (see
section 8).
There are now three different selections, depending on the application:
1. Select concentration table: ALCOHOL, BRIX, CONCENTRATIONS.
2. Select temperature table: API.
3. Select viscosity correction: see section 6.2.
METTLER TOLEDO DE40/50/51 Density Meter
71
Application Memory Card
13.2.1 Select a concentration table: ALCOHOL, BRIX, CONCENTRATIONS
Method 1 <Calc.Parameter>
Press the <CALC.PARA> key.
0.Density
1.Result
2.Temperature Compensation
3.Decimals
Select “1.Result”. Confirm with
<ENTER>.
Method 1 <Result>
Result
Exit
:<Brix
:[Execute]
Select “Brix” (Alcohol,
Concentration, according to your
application). Confirm with
<ENTER>.
>
Press <ENTER> (confirm Execute).
Press <METHOD>.
< Method List >
No.
Name Temp.(°C)
Result
0. Method-0
20.0
d
1. ORANGE
20.0
Brix
2. Method-2
20.0
d
3. Method-3
20.0
d
4. Method-4
20.0
d
.
The method list now should show
you the selected method with the
corresponding application.
13.2.2 Select a temperature table: API
Method 1 <Calc.Parameter>
0.Density
1.Result
2.Temperature Compensation
3.Decimals
Method 1 <Temp.Comp.>
Temp.Comp
Comp.Temp.
Temp.Formula
: Off
On
:[20.00]°C
:<Oil Table-1>
Press the <CALC.PARA> key.
Select “2.Temperature
Compensation”. Confirm with
<ENTER>.
Select “Oil Table-1” (Oil Table-2 or
Oil Table-3, according to your
application) with the → key. See
also section 14.1. Confirm with
<ENTER>.
Press <RESET>.
72
METTLER TOLEDO DE40/50/51 Density Meter
Application Memory Card
13.3
How to retrieve an application (Uninstall table)
This section will show you how to retrieve an application from the instrument, for example to
transfer it to another instrument.
Insert the empty Application Memory Card into the slot on the front left part of the instrument.
Press the <FUNC> key.
< Function >
0.Data File
1.Sample File
2.Method File
3.Changer
4.Factor
5.Set Check
6.Periodic
7.Auto Start
8.CARD utility
9.Memory Clear
Select “8.CARD utility”. Confirm with
<ENTER>.
Select “7.Uninstall Table”. Confirm
with <ENTER>.
< CARD utility >
0.Data delete
5.Table Capacity
1.Sample delete
6.Install Table
2.Method delete
7.Uninstall Table
3.Format
4.CARD Information
Select “0.Conc.Table” if your application is a concentration table:
BRIX, ALCOHOL, CONCENTRATION,
or select “1.Temp.Table” if your
application is a temperature table:
API.
Confirm with <ENTER>.
< Uninstall Table >
0.Conc.Table
1.Temp.Table
2.Exit
The asterisk (*) on the left of the application (BRIX) shows that this application has been
downloaded and removed from the Memory Card. This means that the Memory Card is
empty, but can still be used to retrieve the application from the instrument.
< Uninstall Table >
Table Name Type
Temp.
*Brix
Conc. 20.00°C
Exit
Data.
85
Select the application to uninstall
with the <UP> and <DOWN> keys.
Select “Uninstall” with the -> key.
Confirm with <ENTER>.
Uninstall
< Uninstall Table >
Now Uninstall ...
METTLER TOLEDO DE40/50/51 Density Meter
Wait until the application has been
uninstalled.
73
Application Memory Card
Press <ENTER>.
Table uninstall is complete
[ OK ]
< Uninstall Table >
0.Conc.Table
1.Temp.Table
2.Exit
74
Select “2.Exit” and confirm with
<ENTER>.
The table on the Memory Card is no
longer marked by an asterisk (*).
METTLER TOLEDO DE40/50/51 Density Meter
Special application cards
14.
Description of the special applications:
BRIX, ALCOHOL, API, VISCOSITY CORRECTION, COKE, USER
TABLES
The standard software of the DE40/50/51 can be expanded by various software options
(METTLER TOLEDO Service) that are available on Memory Card. This allows you to match
the selection of the method parameters to your requirements.
14.1
API software
The density of crude oils, oil products or lubricants must in some cases be measured at
elevated temperatures owing to their viscosity. With this software, stored tabulated values
are used for the automatic conversion of this density to that at 15 °C or 60 °F, depending on
the temperature unit you measure with. The tabulated values are based on API standard
2540 (API: American Petroleum Institute).
Under the parameters of the temperature compensation, select the required oil table (see
Section 9.2 and 14.4).
Oil table 1:
Oil table 2:
Oil table 3:
the density of crude oils is converted to the reference temperature of 15° C
(or 60° F) according to table 53A of the API standard.
the density of oil products is converted to the reference temperature of
15° C (or 60° F) according to table 53B of the API standard.
the density of lubricants is converted to the reference temperature of
15° C (or 60° F) according to table 53D of the API standard.
To calculate the "API degrees", enter "((1/d) – 1) * 141.5 + 10" as concentration function (see
Section 9.2 and 14.6).
14.2
Alcohol software
With this software the measured density of an alcoholic solution can be converted to the
corresponding volume concentration of Ethanol in water i.e. % v/v. Two different conversion
tables exist for this conversion, depending on the physical unit the temperature is measured
(and the reference temperature):
14.2.1 Temperature measured in °F, with a reference temperature at 60 °F:
This option is activated by selecting the temperature unit °F (see Section 11.6). The stored
values are based on table 3 of NBS Circular 19 (NBS: National Bureau of Standards, since
1988: National Institute of Standards and Technology). You must perform your
measurements at 60 °F to obtain the correct ethanol content.
METTLER TOLEDO DE40/50/51 Density Meter
75
Special application cards
14.2.2 Temperature measured in °C, with a reference temperature at 20 °C:
This option is activated by selecting the temperature unit °C (see Section 11.6). The stored
values are based on table IVa of OIML Guideline No. 22 (OIML: Organisation Internationale
de Métrologie Légale). You must perform your measurements at 20 °C to obtain the correct
ethanol content.
Under the parameters of the concentration calculation, select "Alcohol [%]" instead of a
calculation function (see also Section 9.2). The density and the alcohol concentration are
printed out as the result, e.g.:
Accuracy
Reproducibility
DE40:
Alcoh 42.1 %
± 0.1 %
± 0.1 %
DE50/51:
Alcoh 42.09 %
± 0.01 %
± 0.01 %
Note:
The alcohol values of measurements with, e.g. whisky, are relative values: They do
not specify the actual concentration as the density also depends on all other
dissolved substances of this beverage.
14.3
BRIX software
With the BRIX software the measured density of a sucrose/water solution can be converted
to the weight percent sucrose content (°BRIX). The stored tabulated values are based on
table 109 of NBS Circular 440 (NBS: National Bureau of Standards, since 1988: National
Institute of Standards and Technology). The measurement temperature for the automatic
conversion is 20 °C.
Under the parameters of the concentration calculation, select "BRIX [%]" instead of a
calculation function (see also Section 9.2). The density and the BRIX degrees are printed out
as the result, e.g.:
Accuracy
Reproducibility (within 0 - 40 %)
DE40:
BRIX 10.23 %
± 0.03 %
± 0.03 %
DE50/51:
BRIX 10.234 %
± 0.003 %
± 0.003 %
Note:
The BRIX values with, e.g. milk are relative values: They do not specify the actual
sucrose concentration as the density also depends on all other dissolved
substances of this beverage.
14.4
Viscosity correction
When measuring samples with higher viscosities (over 10 mPs), the oscillation tube
technique shows a slightly higher value than the real density of the samples. This application
corrects the systematic viscosity error when measuring samples with higher viscosities. See
section 6.2. for more information.
76
METTLER TOLEDO DE40/50/51 Density Meter
Special application cards
14.5
Coke (Cola drinks)
This Memory Card allows to measure BRIX and HFCS42 (also called SOLIDS) of all Cola
products, from beverages to the highly viscous syrup (concentrate). This card includes
viscosity correction, required for syrup measurement and specially tuned up for Cola
products. This viscosity correction is especially required for products over 40°BRIX (resp.
50°SOLIDS).
14.6
Coefficients for conversion to various concentration data
With all software you can convert the measured density directly to Baumé, Twadell, API or
milk degrees:
In the Calc.Para menu select <Result>, <Conc.>, <Parameter Set>, <Coefficient>. Then:
t
–
–
–
–
t
select the relative density d 4 or d t
select the term for the x-axis under Data Replace,
select A + Bx as calculation function,
enter the coefficients A and B under Manu Set.
The “Conc” value is printed out as the result in each case.
Parameter Entry
Concentration
Conversion
function
Meas.
temperature
[°C]
Relative
density
t
Heavy Baumé deg.1) ((1/d) – 1) * -144.3
15.0
d4
Light Baumé deg.1)
((1/d) – 1) * 144.3 + 10
15.0
d4
Jap. Sake degrees
((1/d) – 1) * 1443
15.0
d4
API degrees
((1/d) – 1) * 141.5 + 10
15.56 2)
dt
Twadell degrees
(d – 1) * 200
--
d4
Milk degrees
(d – 1) * 1000
--
d4
1)
2)
t
t
t
t
t
Term of the
x-axis
Coefficients of the
function A + Bx
A
B
(1/d) – 1
0
-144.3
(1/d) – 1
10
144.3
(1/d) – 1
0
(1/d) – 1
10
1443
141.5
d–1
0
200
d–1
0
1000
Note: replace 144.3 by 145 for USA.
15.56 °C corresponds to 60 °F.
METTLER TOLEDO DE40/50/51 Density Meter
77
Automatic sampling pump
15.
Automatic sampling pump ASU-DE (optional)
This optional automatic sampling unit replaces the air pump that comes with the basic
installation. With its membrane pump it allows to aspire samples of low to medium viscosity
(at the max. ca. 1000 mPa·s) directly into the measurement tube, to empty, rinse and dry it
after the measurement.
The sequence described in section 8.5, used to control this routine, allows to eliminate
operator specific influences on the measurement which usually occur when using a syringe.
This option allows you to get reproducible results, regardless of the operator using the
instrument.
This pump is also required together with the DCU-300B auto rinsing unit, the SOP40 and
SOP50 and the CHG-260B sample changer.
Instead of using the standard waste bottle of the ASU-DE you can also use the automatic
draining unit AD-510.
15.1
Safety measures
Measures for your safety
- Make sure to switch off the DE40, DE50 or DE51 and disconnect the power cable before
installing the automatic sampling pump ASU-DE!
- Make sure that the solvents used to rinse the measurement tube do not form dangerous
mixtures or reactions when combined with the sample solutions or other solvents, since all
solutions are dejected into the same waste bottle!
- Connect the exhaust tube to a system capable of disposing of poisonous or corrosive gases!
Measures for operational safety
- Empty the waste bottle (drain pot) before it is filled to the rim! Otherwise the waste solution
is sucked into the pump and ejected through the exhaust. This could even damage the pump.
- The material in contact with the liquid for sampling is made of glass, Teflon or carbon. Do
not use any sample that may corrode the material.
Samples of high viscosity cannot be aspirated. Maximum viscosity that can be pumped is
approximately 1000 mPa-s.
78
METTLER TOLEDO DE40/50/51 Density Meter
Automatic sampling pump
15.2
Installation
- Switch off the DE40/DE50/DE51 and
disconnect the power cable.
- Place the unit backside down as shown to
attach two rails for the holder of the waste
bottle.
Fasten Rail 1 by two screws. Slide in the
board into rail 1 and 2, and then fasten
rail 2 by two screws.
- The board can be slid under the instrument if
it is not in use.
rail 1
rail 2
- Detach rear panel and plate. Undo the four
screws fastened to the rear panel and pull
the small plate out of the panel as shown
(sits very tight).
- Remove the three large screws (marked with
red) just right of the air pump unit. These
screws are used as transportation security to
hold the measuring cell, which is mounted on
shock absorbers, firmly against the chassis
during transportation. Make sure to keep
these screws for future need of re-shipping.
- Remove the air pump.
a) Undo three screws fastened to the
pump unit.
b) Disconnect the pump connector (1) and
dry air tube (2).
c) Move the pump unit first to the right (ca.
3 cm), then up and remove it.
2
1
Note: Disconnect the dry air tube carefully in
order to avoid damage.
METTLER TOLEDO DE40/50/51 Density Meter
79
Automatic sampling pump
- Install the ASU-DE in the place of the air
pump.
5
a) Slide in the ASU-DE down and to the left,
adjusting its bottom fitting to the angle
hole of the main unit.
b) Fasten the ASU-DE by the three screws
which were used to hold the air pump.
c) Connect the pump connector (3 black,
2-poles) and solenoid connector (4 white,
3 poles) to the main unit.
3
d) Connect the dry tube (5) to the joint for
the desicator tower.
- Install rear panel (Follow reverse steps from above).
- Attach the supplied seal (Align to line ”A”).
4
- Connect the air tube (tygon, with Teflon
connector at one and PP connector at the
other) to the dry air out (without black
tightening clamp).
- Insert the sampling tube (one connector only)
into the measuring cell inlet (lower port),
connect the drain tube (two connectors) to
the measuring cell out (upper port) to the
pump-in connector (black clamp).
Note:
80
Make sure the white Teflon tube
nozzles are firmly tightened clockwise.
METTLER TOLEDO DE40/50/51 Density Meter
Automatic sampling pump
Warning:
If using samples and rinsing solutions which
could create poisonous or corrosive gases,
connect the exhaust tube to the exhaust
connector and lead the other end to a system
capable of disposing of these gases.
- Connecting the waste bottle:
Connect the black tube from the pump unit to
the higher connector of the bottle cap and
tighten the screw firmly. Push the transparent
tube from the pump unit into the ohter
connector of the bottle cap, so that it
protrudes ca. 30 mm below. Then tighten the
screw firmly.
Note: If the connectors are not screwed in tightly, the pump will not (or hardly) be able to
move the sample.
- Pull out the plate for the waste bottle on the left side of the instrument, place the white plastic
mug on it, and put the waste bottle in the mug.
METTLER TOLEDO DE40/50/51 Density Meter
81
Error messages and malfunctions
16.
Error Messages and Malfunctions
16.1
Error Messages
Error message
Cause
Measure
Nozzle error
The sampling nozzle did not
move normaly (SC24, DCU-300 or
SOP50.
Remove the obstacle.
Replace the nozzle if it is bent or
borken.
Press [Stop] key to reset the
error.
Table error
The rotation of the turnable was
not normal (SC24).
Remove the obstacle.
Press [Stop] key to reset the
error.
Temperature
control error
The set temperature can not be
reached within 2 hours after start.
Switch off the instrument and call
METTLER TOLEDO service.
Communication
error
Cable not connected correctly.
Check connection of the
communication cable.
Check that the correct instrument
is selected in "Function 3": SC24,
CHG, DCU.
Wrong instrument selected in
Function 3.
Viscosity Correction
Error
Air bubbles or smudge in the cell.
Perform adjustment with viscosity correction on.
Check measuring cell.
Malfunction
Cause
Measure
Instrument can
not be switched
Cable not plugged in properly,
fuse blown.
Check power cable and mains.
Replace fuse if blown (T3.15A/250V).
No "Ready"
message is
reached.
Air inlet at rear of the instrument
blocked.
Cooling fan not operating.
Remove obstacles that block the
air inlet.
Call METTLER TOLEDO service
for help.
Stored data are
lost (e.g. time)
The internal battery is discharged.
Swich off the instrument and call
METTLER TOLEDO service.
Printer not
printing.
DIP switch of printer not set
correctly.
Wrong communication setting for
printer.
Check DIP switch setting of the
printer.
Check setings in "Setup 0".
16.2
82
No adjustment with viscosity correction.
Malfunction
METTLER TOLEDO DE40/50/51 Density Meter
Error messages and malfunctions
Malfunction
Cause
Measure
Nothing displayed
Contrast has been changed.
Call METTLER TOLEDO service
for help.
No key entry
possible
Measurement
not reproducible
Call METTLER TOLEDO service
for help.
Sample not homogeneous, air bubbles
in the measuring tube, measurement
temperature unstable.
Is the bench vibrating?
Cell contaminated with old sample.
Check factors mentioned.
Check if temperature is stabilized.
Measurement cell filled completely?
Place instrument on a non-vibrating bench.
Clean measuring cell thoroughly.
Air bubbles in the
sample i.e. measurement never
ends or measuring
times vary greatly.
Leaking connections?
Sample likely to produce bubbles
or mixture containing components
with low coiling point?
High sample viscosity?
Check connections.
Degass sample (ultrasonic bath or
heating) or measure at reduced
temperature.
Use a syringe or warm up the sample.
Long sampling
time.
Wrong setting of the flow control
valve.
Sample viscosity too high.
Adjust the sampling speed to your
sample with the valve.
Use a syringe to inject the sample.
Measurement of
distilled water free
of air bubbles
takes too long.
Adjustment of the
instrument with air
and water at higher
temperatures takes
too long.
Switch off the instrument and call the
METTLER TOLEDO service.
Air or gas bubbles are generated by
the heating-up of the water in the
measuring cell.
METTLER TOLEDO DE40/50/51 Density Meter
Boil the distilled water, or degass it in
an ultrasonic bath (at least at the
measuring temperature), and inject it
at this higher temperature to avoid
formation of air or gas bubbles.
83
Maintenance
17.
Maintenance
17.1
Changing internal battery
The battery is used for data storage and has a service life of around 5 years when it is kept
charged. We thus recommend switching the instrument on now and then to ensure the
battery remains operational during this time.
17.2
Power line voltage, power line, fuse
The DE40/50/51 will adapt automatically to the power line voltage in the range of 100 to
240V and 50/60 Hz.
Changing blown fuses:
- Switch off the instrument and disconnect all cables on the rear of the instrument.
- Put the instrument on the rear side.
- Remove the small plate at the instrument’s bottom plate by unscrewing the 2 screws.
- Change the blown fuse(s) and put the small plate in place again. Make sure to use the correct
fuse type for replacement: T3.15A / 250V.
17.3
Replacing the silicagel
- Replace the silicagel of the drying tube when it becomes pink. If this is not done the drying
of the measurement tube (and thus the adjustment with dry air) is no longer assured.
17.4
Replacing the tube nozzles
If you find air bubbles in the measurement tube on every sample injection which do not
originate from the sample itself, the tube nozzle may be leaking or damaged. To change the
tube nozzles, proceed as follows:
- Carefully remove the protective silicone cap that holds the nozzles correctly in place. Make
sure not to tear at the rim, but hold its strong middle part with your fingers.
- Unscrew the tube nozzle anticlockwise and then screw in the new one tightly by hand. Do
not apply pressure as this would damage the measurement tube.
- Then put the protective silicone cap in place again with the squared hole at the bottom so
that leaking liquid from the cell unit can flow out.
84
METTLER TOLEDO DE40/50/51 Density Meter
Standard and optional equipment
18.
Standard and optional equipment
18.1
Standard equipment
Order No.
Operating instructions Englisch
51709838
Sampling/Drain tubes, 2 pcs (without joint)
51328032
Joint for Sampling/Drain tube (PTFE/PP)
51328035
Teflon tube nozzle (for connection to measuring cell)
51328027
Tube nozzle special (to use with joint with thread)
51322238
Joint with thread for Sampling/Drain tube (to be used
with tube nozzle special)
51322239
Exhaust tube (1m)
51328133
Desiccator
51322012
Silica gel 1kg
Protective rubber for sample inlet
METTLER TOLEDO DE40/50/51 Density Meter
105080
51322045
85
Standard and optional equipment
18.2
Optional equipment
In use cover
51107119
Fuse T3.15A
51522100
Plastic syringe 10mL (set of 100)
86
71482
Certified density standards:
8 mL vials, with certificate
- Water (0.99… g/cm3 +/- 0.00001)
- Beverage sirup (1.04… g/cm3 +/- 0.00010)
- Dichlorotoluene(1.26… g/cm3 +/- 0.00002)
- Fluorocarbon (1.95… g/cm3 +/- 0.00002)
51338002
51338003
51338004
51338005
Memory Cards:
- Data, methods and sample file storage
- Alcohol
- BRIX
- API
- Coke BRIX & solids
- Viscosity correction (for DE40)
51324004
51324000
51324001
51324002
51324009
51324003
GA42 printer:
- Alphanumerical printer (serial)
- Set of paper rolls (5 pcs)
- Ribbon catridge (black)
- Connection cable (not included)
GA42
00072456
00065975
51190362
PC software (for Windows 95 & 98):
- Data transfer software to EXCEL (version 7.0 or later)
- Data transfer software for DE/RE combination
- Connection cable to computer
51324100
51324101
51190362
ASU-DE sampling pump
- Sampling pump
- Waste bottle (250 mL) with lid
51321500
51322011
METTLER TOLEDO DE40/50/51 Density Meter
Standard and optional equipment
AD-510 Auto Drain Unit
(requires ASU-DE)
51321807
DCU-300B Auto Rinsing Unit
(requires ASU-DE)
51321805
CHG-260B Sample Changer (60 samples)
51321208
SOP40 Sample Operation Programmer, 4 steps
51321600
SOP50 Sample Operation Programmer, 5 steps
51321601
SC24 Sample Changers
- SC24 (basic version)
- SC24H (high temperature version, electrical heating)
- SC24L (low temperature version, requires water bath)
51321300
51321301
51321302
SC24 connection sets
- Connection to DE40/50/51
- Connection to DE/RE combination
51322007
51322009
Refractometers
The following refractometers can be connected to the
DE40/50/51 density meters for simultaneous measurement
of density and refractive index)
- RE40, 4 decimal places
51320400
- RE50, 5 decimal places
51320401
Refractometer connection sets
- DE/RE connection set (basic version)
- SC24 connection set to DE/RE combination
METTLER TOLEDO DE40/50/51 Density Meter
51322010
51322009
87
MemoCard DE40/50/51 (Short Instructions)
Sample
Sample No, Sample ID
(and number of samples if
Sample file ON)
Viscosity correction (DE51, DE40 with
Memory Card Viscosity)
Report
Select print format
off
short
GLP
variable
Meas.
Para
Calc.
Para
Set measurement parameter
Method name
Measuring temperature
Stability
Wait time
Sequence (ON/OFF)
Sampling
Drain
Rinse-1
Rinse-2
Purge
Calculation parameter
Result
d, d tt , d t4
BRIX, API, Alcohol (if selected)
Concentration
(enter table)
(enter coefficients)
Temperature compensation
(enter coefficients)
Decimals
for d t
for d tt , d t4 (if temp.comp. select.)
BRIX, API, Alcohol (if selected)
for Conc. (if Conc. selected)
Method
Method selection
Method 0 to 9
Display
Display selection
Density
Oscillation
BRIX, API, Alcohol (if so selected)
Conc. (if Conc. selected)
Print
Function selection
0. Data file
1. Sample file (ON/OFF)
2. Method File
3. Changer
4. Factor
5. Set check
(name, value, tolerance)
6. Periodic (check and adjustment)
(check interval)
(show check list)
7. Autostart
8. Card utility
9. Memory clear
Setup
Setup selection
0. Interface
(Printer, RS-232)
1. Date & Time
2. Name
3. Serial/Version No.
4. LCD contrast
5. International
(date format)
(°C or °F)
6. Lock
7. Beep
8. Temperature calibration
Check
Run instrument check
Periodic check (on check date)
Daily check (all other dates)
Calib.
Perform adjustment
BS
Backspace (erase)
Rinse/
Purge
Rinse/Purge, only for SC24 and DCU-300
(Sequence must be ON)
Pump
Pump ON/OFF, for ASU-DE
Clear
Clear entry (2 x to clear name)
Esc.
Escape
Print message or parameter
Measure
88
Function
Start measurement
(including sample sequence
if Sequence ON)
Reset
Return to main display
METTLER TOLEDO DE40/50/51 Density Meter
Density tables
Annex 1:
Density table of dried air
The density of dried air at a specified temperature t and a atmospheric pressure of
760 mm Hg is calculated according to the following formula:
d (g/cm3)
=
0.0012932
1 + 0.00367 x t (°C)
x
p (mm Hg)
760
The values stored in the instrument are listed in the table below. Intermediate values are
interpolated according to the LaGrange polynomial.
Temp. Density
[ °C] [ g/cm3]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0.00129
0.00129
0.00128
0.00128
0.00127
0.00127
0.00127
0.00126
0.00126
0.00125
0.00125
0.00124
0.00124
0.00123
0.00123
0.00123
0.00122
0.00122
0.00121
0.00121
0.00120
0.00120
0.00120
0.00119
0.00119
Temp.
[ °C]
Density
[ g/cm3]
Temp.
[ °C]
Density
[ g/cm3]
Temp.
[ °C]
Density
[ g/cm3]
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
0.00118
0.00118
0.00118
0.00117
0.00117
0.00116
0.00116
0.00116
0.00115
0.00115
0.00115
0.00114
0.00114
0.00113
0.00113
0.00113
0.00112
0.00112
0.00112
0.00111
0.00111
0.00111
0.00110
0.00110
0.00110
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
0.00109
0.00109
0.00109
0.00108
0.00108
0.00108
0.00107
0.00107
0.00107
0.00106
0.00106
0.00106
0.00105
0.00105
0.00105
0.00104
0.00104
0.00104
0.00103
0.00103
0.00103
0.00103
0.00102
0.00102
0.00102
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
0.00101
0.00101
0.00101
0.00101
0.00100
0.00100
0.00100
0.00099
0.00099
0.00099
0.00099
0.00098
0.00098
0.00098
0.00097
0.00097
Chemical Handbook Fundamental Version, Rev. 3, Table 5.1 (1984).
METTLER TOLEDO DE40/50/51 Density Meter
89
Density tables
Annex 2:
Density table of pure water
The instrument has stored the density of water at 760 mm Hg according to the following
table:
Temp. Density
[ °C] [ g/cm3]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0.99984
0.99990
0.99994
0.99996
0.99997
0.99996
0.99994
0.99990
0.99985
0.99978
0.99970
0.99961
0.99950
0.99938
0.99925
0.99910
0.99894
0.99878
0.99860
0.99841
0.99821
0.99799
0.99777
0.99754
0.99730
Temp.
[ °C]
Density
[ g/cm3]
Temp.
[ °C]
Density
[ g/cm3]
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
0.99705
0.99679
0.99652
0.99624
0.99595
0.99565
0.99534
0.99503
0.99471
0.99438
0.99404
0.99369
0.99333
0.99297
0.99260
0.99222
0.99183
0.99144
0.99104
0.99033
0.99022
0.98980
0.98937
0.98894
0.98849
50
55
60
65
70
75
80
85
90
0.98805
0.98570
0.98321
0.98057
0.97779
0.97486
0.97183
0.96862
0.96532
Chemical Handbook Fundamental Version, Rev. 3, Table 5.2 (1984).
90
METTLER TOLEDO DE40/50/51 Density Meter
Specifications
Specifications
Type and model name
Digital density meter DE40, DE50, DE51
Measuring method
Oscillating U-tube
Density
DE40
DE50, DE51
Measuring range d
0.0001 to 3 g/cm3
0.00001 to 3 g/cm3
Limit of error
d
1 x 10-4
2 x 10-5
Repeatability
d
1 x 10-4
1 x 10-5
Resolution
d
1 x 10-4
1 x 10-5
Temperature
Control
Peltier
Range
T
4 – 90 °C
4 – 70 °C
Precision
T
T
0.05 °C (10 to 30 °C)
0.1 °C ( 4 to 90 °C)
0.02 °C
0.05
Memory Card (option)
DE50: not possible
DE51: standard
Viscosity compensation
(10 to 30°)
(4 to 70 °C)
Sample required
min. 1.2 mL (manual injection with syringe)
min. 2 mL (automated operation with optional pump)
Typical meas. times
1 to 4 minutes (manual operation)
2 to 10 minutes (programmed automated operation)
Display
LCD (Liquid crystal display): 7 line display, backlit
External I/O
1 RS-232C (for computer and combination)
1 RS-232C (for external printer)
1 special serial interface (for sample changer)
1 Memory Card (PCIMCIA)
Ambient condition
1) Temperature:
2) Humidity:
Power source
AC 100-240 V, 50/60 Hz
Power consumption
200 W
Dimension
270 mm (W) x 400 mm (D) x 410 mm (H)
Weight
15 kg
METTLER TOLEDO DE40/50/51 Density Meter
5 ~ 35 °C
below 85 % RH (no condensation)
91
FCC Rules and Radio Inteference Regulations
FCC Rules and Radio Interference Regulations
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to both Part 15 of the FCC Rules and the radio interference regulations of
the Canadian Department of Communications. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is like to cause harmful interference in which case the user will be required to correct the
interference at his own expense.
92
METTLER TOLEDO DE40/50/51 Density Meter
To protect your METTLER TOLEDO product’s future:
METTLER TOLEDO Service assures the quality, measuring accuracy and
preservation of value of all METTLER TOLEDO products for years to come.
Please send for full details about our attractive terms of service.
Thank you.
Printed on 100% chlorine-free paper, for the sake of our environment.
*P51709838*
© Mettler-Toledo GmbH 1999
Subject to technical changes and to the availability
of the accessories supplied with the instruments.
ME-51709838 Printed in Switzerland 9906/2.12
Mettler-Toledo GmbH, Analytical, Sonnenbergstrasse 74, CH-8603 Schwerzenbach,
Tel. (01) 806 77 11, Fax (01) 806 73 50,
Internet: http://www.mt.com