Installation
1. Unpack the meter, power supply, this instruction
manual, electrodes, electrode arm, buffer
sachets, guide book and calibration certificate.
Keep the calibration certificate in a safe place.
b. Insert and tighten the fixing screw.
c. Turn the meter and base the right way up and
locate the electrode arm onto the base fixing
post. Press down to snap into place.
2. Check the power supply unit is the correct
voltage for your local supply. If it is not, contact
your distributor.
3. Attach the electrode arm to the left or righthand
side of the meter:
a. Turn the meter upside down and seat the
dome of the electrode arm base into the left or
righthand meter recess.
1
Input and Output Connections
Rear Panel
power supply
unit socket
data output
socket
pH or
automatic temperature
combination
compensation probe
electrode socket socket
reference
electrode
socket
conductivity
sensor
socket
titrator
output
socket
1. Disconnect the shorting clip from the pH socket
and retain it by clipping it over the socket.
2. Connect the electrode to the pH socket. If you are
using an electrode incorporating ATC connect
the other lead to the ATC socket.
3. If you are using a separate ATC probe for the pH
channel connect it to the ATC socket.
4. Connect conductivity sensor to the Sensor socket.
5. Connect the power supply unit to the DC socket.
2
Displays
pH/mV
Conductivity/TDS
stability/auto
endpoint
indicator
stability/auto
endpoint
indicator
main
display
program
menu
icons
electrode
condition
indicator
automatic or
manual
temperature
compensation
indicator
main
display
data
transfer
icon
data
transfer
icon
temperature,
electrode
offset/slope
memory, cal
and error
number
automatic
temperature
compensation
indicator
temperature
memory, cal
and error
number
3
Controls - pH/mV
On
Off
places meter into standby mode/wakes meter up
starts/stops measurement
Read • hold down for 2 seconds to reset sample ID number
Cal
starts calibration
• hold down for 2 seconds to recall calibration data
Mode selects pH or mV mode and deselects channel
• hold down for 2 seconds to enter Program menu
endpoint stability/auto endpoint
MTC auto or manual
ATC temp. compensation
continuous data transfer
Program Menu Indicators
time and date
MTC manual temperature entry
M
stores result in memory. Increases value in
Program menu
• hold down for 2 seconds to turn beeper on/off
R
recalls result from memory. Decreases value
in Program menu
• hold down for 2 seconds to turn continuous
data transfer on/off
Calibration Indicators
turns auto endpointing on/off
% slope electrode slope value
A
4
Display Indicators
buffer selection
cal reminder interval
E0 mV
electrode offset value
electrode
condition
Controls - Conductivity/TDS
On
Off
Read
places meter into standby mode/wakes meter up
starts/stops measurement
Display Indicators
endpoint stability/auto endpoint
ATC auto temperature compensation
continuous data transfer
Cal
Mode
starts calibration
Program Menu Indicators
selects conductivity or TDS mode and
deselects channel
• hold down for 2 seconds to enter Program menu
P1 solids factor
M
stores result in memory. Increases value in
Program menu
R
recalls result from memory. Decreases value in
Program menu
• hold down for 2 seconds to turn continuous
data transfer on/off
A
turns auto endpointing on/off
(0.40 to 1.00)
P2 reference temperature
(20 or 25°C)
P3 temperature coefficient
(0.0 to 10.0 %/°C)
P4 TDS units
(mg/L or ppm)
P5 mV output mode - titrator output
(20.0µS, 200µS, 2.00 mS, 20.0 mS, 200 mS
or t.op)
5
Calibrating - pH
Before commencing calibration it is essential that
you read the following sections:
n
Operating Hints
n
Program Menu - pH/mV. Following the
instructions you will therefore have set the time
and date, manual temperature compensation (if
required), the correct buffer set, the order in
which the buffers are prompted and the
calibration reminder interval.
n
Endpointing a Reading. Set the auto endpoint
feature if required.
When you press Cal the pH buffer you selected
for cal 1 (Program Menu) is displayed for
2 seconds, and then the meter starts calibrating.
The meter will perform automatic buffer
recognition and therefore buffers can be
presented in any order. They will, however be
prompted in the sequence setup in the program
menu.
2. If you are using auto endpoint the calibration
reading will freeze automatically when a stable
endpoint is reached.
Otherwise
when the stability indicator
1 point calibration
1. Example
appears.
Example display
↓ 2 seconds
buffer
6
Calibrating - pH (continued)
Electrode Condition Indicator
3. Rinse the electrode and blot dry
This indicator is displayed on a 2 point or 3 point
calibration when the meter has endpointed and shows
the condition of the electrode at that time.
to return to sample measurement, or
continue with step 4 for further cal points
2 or 3 point calibration
95.0 - 105.0%
electrode in
good
condition
90.0 - 94.9%
electrode
needs
cleaning
85.0 - 89.9%
electrode
needs
conditioning
4. Repeat steps 1, 2 and 3 using other buffers for a
2 point or 3 point calibration.
n
Press Cal repeatedly to exit the calibration routine at
any stage.
n
When a calibration has endpointed you can press Mode
to display the absolute mV value and temperature of
the buffer. The display reverts to the buffer and E0
values, or buffer and slope values for a 2 point or 3
point calibration after 2 seconds.
7
Calibrating - Conductivity/TDS
8
2. Calibration
Example
Before commencing this procedure it is essential
that you read the following sections:
n
Operating Hints
n
Program Menu - Conductivity/TDS. Following the
instructions you will therefore have set the solids
factor, reference temperature, temperature
coefficient, TDS units and mV output mode titrator output where appropriate.
n
Endpointing a Reading. Set the auto endpoint
feature if required.
1. Select conductivity or TDS mode
hold in
air
Use auto endpoint
or
to freeze the reading.
3. Repeat step 2 using conductivity standard.
If you wish to move straight to a first calibration
on conductivity standard, without first calibrating
on air, press Cal twice.
4. Rinse the sensor
5. Press Read to return to sample measurement.
Measuring Samples - pH/mV
n
1. Select pH or mV mode
n
2. Measure sample
n
If you press Mode to select pH or mV mode the meter
begins measuring immediately. You will not need to
press Read to start the reading.
The decimal point flashes during sample
measurement. When the electrode output
has stabilized the stability indicator appears.
Manual endpoint - press Read to endpoint.
Auto endpoint - the meter automatically endpoints.
If you have the RS232 cable connected to the Data
socket, sample data is transmitted at endpoint.
Use auto endpoint
or
to freeze the reading.
3. Rinse, blot and store the electrode.
9
Measuring Samples - Conductivity/TDS
3. Rinse the sensor
1. Select conductivity or TDS mode
Ensure that the solids factor and
temperature coefficient set are
appropriate for the sample being
measured.
2. Measure sample
n
If you press Mode to select conductivity or TDS mode
the MPC227 begins measuring immediately. You will
not need to press Read to start the reading.
n
The decimal point flashes during sample
measurement. When the sensor output
has stabilized the stability indicator appears.
Manual endpoint - press Read to endpoint.
Auto endpoint - the MPC227 automatically endpoints.
n
If you have the RS232 cable connected to the Data
socket, sample data is transmitted at endpoint.
Example
sample
Use auto endpoint
or
to freeze the reading.
Sensor Precautions
CAUTION: To prevent static damage to the
MPC227 always disconnect the conductivity
sensor from the meter before cleaning the
sensor.
10
Operating Hints
n
For greatest accuracy, standards and samples should
be at the same temperature.
n
Do not use solutions after the expiry date.
n
Always measure pH and conductivity separately.
Results will be affected if both are measured at one
time in the same beaker.
pH/mV
n
Before using the electrode remove the wetting cap and
rubber fill hole cap (if fitted).
n
Calibrate using buffers with values that bracket that of
the sample. With a new pH electrode, or after
maintenance, we recommend you use a buffer close to
pH 7 for the first calibration point.
When you select the calibration buffers (Program
Menu), set the buffer you will use most frequently for
1-point calibrations as cal 1 and the one you will use
most frequently for the second calibration point as
cal 2, and the one you will use most frequently for the
third calibration point as cal 3.
n
n
When transferring the electrode from one solution to
another, rinse it with distilled water and blot dry with
tissue paper - do not wipe the electrode as this may
cause polarization and slow response.
n
Correct storage of pH electrodes is very important.
Consult the electrode manufacturer’s instructions for
advice.
Conductivity/TDS
n
When measuring, make sure the solution is above the
cell chamber slot.
n
Make sure the cell chamber is free of bubbles when
measuring. To reduce air bubbles, immerse the sensor
at an angle and then raise to the vertical position.
n
Rinse sensor with next measurement sample between
measurements, and ensure sensor is dried when
re-zeroing the instrument.
n
For greatest accuracy, calibrate using a standard close
in value to the sample.
11
Endpointing a Reading
Using the Memory
While the electrode is reading the decimal point will
flash. Endpointing a reading can be achieved by:
Entering a Reading into Memory
Using Manual Mode
The meter will continue reading until the Read button
is pressed to manually endpoint the reading. During
reading the stability indicator
may appear to
show that the meter recognises that a stable
endpoint has been reached. Press Read to confirm
this endpoint and to freeze the display.
Using Auto Endpoint
If this feature is used the display will freeze
automatically when a stable endpoint is reached and
will be displayed.
To use this method press A . The auto endpoint
indicator
is displayed while the meter is reading.
To turn off press A again.
A reading can be manually endpointed at any time
in auto mode by pressing Read.
12
You can store 10 endpointed results for pH/mV
and 10 for Conductivity/TDS.
Press M when the measurement has endpointed.
M 1 is displayed (or M 2 to M 10 if readings have
already been stored). M 10 indicates the memory is full.
Recalling Memory
You can only recall stored memories once the
current measurement has endpointed.
Press R - the last stored memory is displayed.
Press R to scroll through memories. RM 1 to
RM 10 indicates which memory is being displayed.
M 0 indicates no memories stored.
Clearing the Memories
Press R until M C is displayed.
Press M to clear the memories, M 0 indicates the
memories have been cleared. (Press Read to exit
without clearing the memories.)
Using Continuous Data
Transfer Mode
In continuous data transfer mode readings are sent
to the data output approximately every second. If
the measurement endpoints (manually, or using auto
endpoint) data transfer stops. If you recall memories
all stored readings are output, (from the first to the
last stored).
To select continuous data transfer mode press and
hold R for 2 seconds.
n
To maintain continuity of sample readings
calibration data is only output at endpoint.
n
To send data from only one channel, deselect the
channel not required by pressing Mode.
Resetting Sample ID
The sample identity number is sent to the serial
output and increments 1 every time a sample
measurement endpoints.
To reset the sample ID number to 1, press and hold
Read for 2 seconds.
will be displayed, showing
that the number has been reset.
Recalling Calibration Data (pH only)
You can only recall calibration data if the current
measurement has endpointed - press Read if
necessary.
Press and hold Cal for 2 seconds. The display shows
the date and time of the last calibration, the buffer
value, the mV offset (E0) for 1-point calibrations, and
the slope value (%) for 2 (3) point calibrations.
13
Program Menu - pH/mV
The Program Menu allows you to set manual
temperature compensation, pH calibration buffers,
calibration reminder and date and time.
You can only enter the Program Menu if the current
measurement has endpointed - press Read if necessary.
Press and hold the Mode key for 2 seconds to access
the Program Menu appears.
Press Mode to scroll through the options and press M
and R to change the value. Press Read to exit the
Program Menu at any time. If you press Read when a
value is flashing that value will not be entered.
Time and Date
Time and date are displayed during
calibration recall, and will be sent to the
serial output. Time is shown on the main
display, the date is shown on the lower part
of the display. Set the time and date using
M and R . Press Mode to enter the value and
move on.
MTC
Manual Temperature Compensation
You can enter temperature manually
between –5.0 and 105.0°C. (An ATC probe
will override manual compensation.) The
meters have a preset temperature of 25°C.
Use M and R to change temperature. Press
Mode to enter the value and move on.
14
pH Buffer Selection
The buffers are grouped in sets
(b = 1, b = 2, b = 3); select your required
set first using M and R :
set 1 = 7.00, 4.00, 10.01, 1.68
set 2 = 7.00, 4.01, 9.21, 2.00, 11.00
set 3 = 6.87, 4.01, 9.18, 1.68
Press Mode to enter the set and move on.
NOTE: Check that the correct buffer set is
selected in order to use the buffers supplied,
i.e. set 1 in the United States, set 2 in Europe
or set 3 in all other countries.
Program Menu - pH/mV (continued)
Choose three buffers (cal 1, cal 2, cal 3)
from the set for calibration. For ease of use,
set the buffers in the order that you will use
cal 1
them.
cal 2
cal 3 The factory settings can be rearranged in
any order using M and R . Press Mode to
enter the value and move on.
Calibration Reminder
The calibration reminder interval can be set,
in hours, between 0 and 99 (where
0 = no reminder). When the selected time
has elapsed the calibration reminder symbol
will appear.
The MPC227 has a preset reminder interval
of 1 hour. Change the interval using M and
R . Press Mode to enter the value and move
on.
Press Read to exit the Program Menu.
15
Program Menu - Conductivity/TDS
The Program Menu allows you to set solids factor;
reference temperature; temperature coefficient and
TDS units.
You can only enter the Program Menu if the current
measurement has endpointed - press Read if
necessary.
Press and hold the Mode key for 2 seconds to access
the Program Menu appears.
Press Mode to scroll through the options and press
M and R to change the value. Press Read to exit the
Program Menu at any time. If you press Read when a
value is flashing that value will not be entered.
Solids Factor
P1
The solids factor is the ratio of TDS (ppm or
mg/L) to conductivity (µS/cm) and can be
set between 0.40 and 1.00. The MPC227 has
a preset solids factor of 0.50. Change the
value using M and R . Press Mode to enter
the value and move on.
P2
P3
Reference Temperature
The temperature to which measurements
are referenced can be set to 20 or 25°C. The
MPC227 has a preset reference temperature
of 25°C. Change the temperature using M
and R . Press Mode to enter the value and
move on.
Temperature Coefficient
Conductivity measurements change with
temperature. The temperature coefficient
(%/°C) is a measure of this change and can
be set between 0.0 and 10.0, as appropriate
for the sample being measured. Adjusting
the temperature coefficient affects the
instrument temperature range - refer to
section on specifications for details. The
MPC227 has a preset temperature
coefficient of 2.0°C. Change the coefficient
using M and R . Press Mode to enter the
value and move on.
16
Program Menu - Conductivity/TDS (continued)
P4
P5
TDS Units
TDS can be measured in mg/L or ppm. (The
MPC227 auto ranges to g/L or ppt). Change
the units using M and R . Press Mode to
enter the units and move on.
mV Output Mode - Titrator Output
The millivolt output range is selected by
setting the mid point of the conductivity
range required. The selectable mid points
are 20.0µS, 200µS, 2.00 mS, 20.0 mS,
200 mS and t. op, and the millivolt values for
the whole meter range are:
Mid point
20µS
200µS
2 mS
20 mS
200 mS
Measurement ranges
18 - 180 mV
180 - 1800 mV
2µS - 20µS
20µS - 200µS
20µS - 200µS
200µS - 2 mS
200µS - 2 mS
2 mS - 20 mS
2 mS - 20 mS
20 mS - 200 mS
20 mS - 200 mS
200 mS - 1000 mS (900 mV)
When the conductivity level falls outside the
range set, the meter will output at the
minimum or maximum point of that range,
whichever is closer.
The meter can be set to output millivolt
values for the whole meter range. This
option is selectable when the displays
shows t.op and the millivolt output values
are:
Measurement ranges
1µS - 10µS
10µS - 100µS
100µS - 1 mS
1 mS - 10 mS
10 mS - 100 mS
100 mS - 1000 mS
mV output ranges
0 - 300 mV
300 - 600 mV
600 - 900 mV
900 - 1200 mV
1200 mV - 1500 mV
1500 mV - 1800 mV
Change the mid point using M and R .
Press Mode to enter the mid point and move
on.
Press Read to exit the Program Menu.
17
18
Interfacing
Serial Output
The MPC227 can interface with computers and
Mettler Toledo printers, Acquire Data Acquisition
software and other RS232 compatible devices via
the RS232 cable. Contact your supplier for a list of
compatible printers. The maximum source or sink
current available is ± 10mA.
Pin
1
2
3
4
5
Signal
device enable (link to pin 5)
RS232 Tx (signal transmit)
not used
CTS (clear to send)
protective ground (0V)
Pin
6
7
8
9
Signal
not used
not used
not used
not used
Data Socket
Type of communication - uni directional, baud
rate 2400, data format - 7 data bits : 1 stop bit : even
parity
n
n
Data is sent to the Data socket at measurement
endpoint (manual or automatic), calibration recall and
memory recall.
To use the output to monitor continually, you need to
select continuous data transfer mode.
Titrator Output
Output voltage is dependent on the range selected
and is set by selecting the mid point of the output
range required. For further information refer to the
section on Program Menu - Conductivity/TDS.
0V
protective ground (0V)
CTS
signal transmit
5
1
9
6
data output
Problem Solving - pH/mV
Err 1 - offset value (E0) out of range
Check correct buffer is used.
Check mV reading for pH 7 buffer is 0 ± 35 mV. If it
is not, clean or replace the electrode.
Err 2 - slope out of range
Slope less than 85%, or not calculable.
Electrode needs cleaning, conditioning or
replacing. Check correct buffers are used.
Slope more than 105.0%.
Check calibration buffers.
.
Displayed (out of range)
Check electrode is connected and immersed in
sample. Check wetting cap is removed.
Data Entry Errors
Date flashes and reverts to previous setting - invalid
date entered.
Entered temperature value changes to –5.0 or
105.0 - the meter will not accept values outside this
range.
Dashes displayed instead of buffer value during
calibration buffer set up - that buffer has already
been selected for a cal point. Cal points must have
different values.
NOTE: Where 0 mV/pH unit = 0%, and
59.16 mV/pH unit = 100% (at 25°C)
Err 3 - pH buffer outside temperature limits
pH buffers must be between 5°C and 50°C for
accurate calibration.
19
Problem Solving - Conductivity/TDS
Maintenance
+Err 1 - measurement out of range
Check sensor is connected and immersed in sample.
Err 2 - cal 1 out of range
Clean the sensor, or replace.
Err 3 - cal 2 out of range
Check correct standard is being used.
Check correct solids factor is being used - for
Mettler Toledo standards use the following factors
1413 µS/cm factor 0.53 12.88 mS/cm factor 0.58
Clean the sensor, or replace.
There are no user replaceable parts in the meter or
power supply unit. Do not remove the cover.
Data Entry Errors
Refer to the electrode product insert for full details
on maintaining your electrode.
Entered solids factor value changes to 0.40 or 1.00 - the
MPC227 will not accept solids factors outside this range.
Entered temperature coefficient value changes to
0.0 or 10.0 - the MPC227 will not accept temperature
coefficients outside this range.
If MTC is displayed, check connection to sensor/
replace sensor.
The meter requires very little maintenance.
Occasionally wipe the meter with a damp cloth. The
casework is made of ABS/PC which is known to be
affected by some organic solvents, including
toluene, xylene and methyl-ethyl-ketone. It is good
practice to wipe away any spillages as soon as they
occur.
Electrode Maintenance
20
Spares and Accessories
Conductivity/TDS
51302118
51302125
00229170
00229119
51302119
51302255
51302256
51302275
51724716
Electrode Arm and Base
RS232 Cable
GA42 Printer
LC - P45 GLP Printer
pH/mV
52000100
52000118
51300164
51302258
51300047
51302069
51302047
51302070
51302068
51340058
51340060
51300194
51302050
InLab 413 ‘3 in 1’ pH Electrode
InLab 410 pH Electrode
30KΩ NTC Probe
Conductivity to Titrator Cable
Guide to pH Measurement
pH 4.01 Buffer Sachets, 30/pack
pH 7.00 Buffer Sachets, 30/pack
pH 9.21 Buffer Sachets, 30/pack
Rainbow Pack Buffer Sachets
(10 each of pH 4.01, 7.00 and 9.21)
pH 4.01 Buffer Solution, 250 mL x 6
pH 7.00 Buffer Solution, 250 mL x 6
pH 9.21 Buffer Solution, 250 mL x 6
51302049
51300139
51300138
4-Plate Carbon Conductivity Sensor
2-Plate Glass Conductivity Sensor
4-Plate Glass Conductivity Sensor
Glass Flow-Through Cell
Guide to Conductivity and Dissolved Oxygen
Measurements
12.88 mS/cm Conductivity Standard Sachets,
30/pack
1413 µS/cm Conductivity Standard Sachets,
30/pack
12.88 mS/cm Conductivity Standard Bottle,
500 mL
1413 µS/cm Conductivity Standard Bottle,
500 mL
21
22
Buffer Tables
The MPC227 automatically corrects pH buffers for temperature using the values shown in the table.
5°C
10°C
15°C
20°C
25°C
30°C
35°C
40°C
45°C
50°C
1.68
1.67
1.67
1.67
1.68
1.68
1.68
1.69
1.69
1.70
1.71
2.00
2.02
2.01
2.00
2.00
2.00
1.99
1.99
1.98
1.98
1.98
4.00
4.00
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.06
4.01
4.01
4.00
4.00
4.00
4.01
4.01
4.02
4.03
4.04
4.06
6.87
6.95
6.92
6.90
6.88
6.87
6.85
6.84
6.84
6.83
6.83
7.00
7.09
7.06
7.04
7.02
7.00
6.99
6.98
6.97
6.97
6.97
9.18
9.40
9.33
9.28
9.23
9.18
9.14
9.10
9.07
9.04
9.01
9.21
9.45
9.38
9.32
9.26
9.21
9.16
9.11
9.06
9.03
8.99
10.01
10.25
10.18
10.12
10.06
10.01
9.97
9.93
9.89
9.86
9.83
Refer to the section: Program Menu - pH/mV Mode, under pH Buffer Selection to select.
11.00
11.72
11.54
11.36
11.18
11.00
10.82
10.64
10.46
10.28
10.10
Specifications
Measurement
Ranges
pH
mV
Cond.
TDS
0.00 to 14.00
± 1999 mV
0.00 to 1000 mS/cm
0.00 to 1000 g/L
Resolution
pH
mV
Temp.
Cond.
TDS
0.01
1
0.1
variable
variable
Relative Accuracy*
pH
± 0.01
mV
± 1 mV
Temp. ± 0.4°C
Input Conditions
Impedance
>1012 ohms
Temp. Compensation
–5.0 to 105.0°C
auto/manual
Conductivity
Temp. Compensation
0.0 to 80.0°C (ATC) - set by
the value of the temperature
coefficient
Auto Calibration Points
Zero and:
84 µS/cm, 1413 µS/cm,
12.88 mS/cm or 80 mS/cm
Solids Factor
0.40 to 1.00, selectable
pH
Reference Temperature
20/25°C, selectable
Isopotential Point
pH
7.00
Calibration Points
pH
3 of 3
* ± 1 least significant digit
** 0 - 200mS:
± 0.5% of range being measured
Temperature Coefficient 0.0 to 10.0%/°C, selectable
Instrument temperature range as adjusted by temp.
coefficient:
0.0 - 2.0% = 0 - 80°C
2.0 - 3.0% = 0 - 60°C
3.0 - 4.0% = 0 - 50°C
4.0 - 7.0% = 0 - 40°C
Cond. ± 0.5%**
TDS ± 0.5%**
Temp. ± 0.4°C
200mS - 1000mS: ± 0.5% of range being measured or
0.15 ohms, whichever is the greater
23
Specifications (continued)
Memory - pH/mV
Conductivity
Outputs
10 memories
10 memories
Titrator (Conductivity)
Serial
LCD
Display
Operating Conditions
Temperature
Humidity at 35°C (non condensing)
Installation Category
Pollution Category
5 to 40°C
max. 85%
2
Degree 2
Size
inches
mm
10 1/2 x 71/2 x 2 1/2
265 x 190 x 65
Weight
lb
kg
2.2
1.0
Power Requirements
The MPC227 is supplied with an appropriate power
supply unit.
USA/Japan
100 - 120V, 50/60Hz, 0.85VA
Europe
230V, 50Hz, 1.1VA
Output from PSU:
9V DC
Meter Power Rating: 0.6VA
NOTE: The meter should only be used with the power
supply unit supplied.
24
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