Forbes User manual
Monec 8965
pH/ ORP TRANSMITTER
User’s
Manual
Monec 8965
pH/ ORP TRANSMITTER
User's Manual
This user manual corresponds to the Monec
8965 / 8965 Ex pH/ORP transmitter Part Nos.
8965L/8965L-Ex/8965H/8965H-Ex and is the
July 2005 revision P.C.No. C2013775.
If you experience difficulty with the installation
or operation of this equipment, please contact
our Customer Service representative.
Manufactured and Marketed by
Forbes Polymetron Pvt. Ltd.
A Forbes Marshall Company
A-34/35, MIDC 'H' Block
Pimpri, Pune 411 018 INDIA
TEL : 91 (0) 20 27442020
FAX : 91 (0) 20 27442040
TLX : (0146) 323 FSON IN 10/04
Dear User,
Thank You for purchasing the Monec 8965 pH/ORP transmitter. To maximize your
benefits from this product, we request that you read this manual thoroughly before
installing the system. A record of the product's maintenance history should be kept in
this manual's Field Service Record every time our service representative visits you.
What's Inside
1.About The Product
1
General Description
Specifications
Operating Principle
2.Getting Started
7
Included Items
What You Need
Mounting
Electrical connections
Commissioning the Product
3.Operation and Maintenance
20
Front panel details
Operating Modes
Programming
Do's and Don'ts
4.Fixing Problems
Troubleshooting
Current output calibration
Spares
Service
Field Service Report
36
1 About The Product
1.1 General Description
The Monec 8965 pH/ORP transmitter is a Microprocessor operated field mounting
instrument to monitor the pH or Redox potential of process solution and transmit 4-20
mA current as a retransmission output. The analyser is designed with modular
hardware and user friendly software support. The 8965 range of transmitters are
designed to suit intrinsic and non intrinsic applications. In all there are 4 versions of
transmitter units in this range.
8965 L
:
Non intrinsic version with external buffer amplifier.
8965 L-Ex
:
Intrinsic version with external buffer amplifier.
8965 H
:
Non intrinsic version with integral buffer amplifier.
8965 H-Ex
:
Intrinsic version with integral buffer amplifier.
The Intrinsic versions are marked as Ex which correspond to the ignition safety
classification " Intrinsic safety ' in accordance with IS standard 5780 E Ex ia IIC T5. All
these models are compatible to probes equipped with glass, antimony or ORP
electrodes.
Since the transmitters are Microprocessor operated, all, the application specific
parameters are field programmable such as type of electrode, measuring range, type
of temperature compensation, calibration mode etc.
The unit offers high reliability and easy serviceability due to modular hardware
structure reducing maintenance lead time. The software calibration facility allows
operation of the instrument without opening the instrument.
1
1.2 Specifications :
Sensors
Glass, ORP or antimony electrodes
Pt 100 temperature sensor
Measuring
range
Parameter
Glass
Antimony
ORP
Span
Lower end
Upper end
pH
2/5/10/14
0....12
2....14
pH
5/10/14
0....9
5....14
mV
500/1000/2000
-1500....+1000
-1000....+1500
Temp. Ind.
0... 1300 C
Power
Supply
15.5.. 30V; the Ex model requires intrinsically safe
power supply with 30V/100 mA max.
Load
725 Ω max at 30 volts
Terminals
Screw type, wire dia Ф 2.5 mm2 max
Temp.
Comp.
Automatic : 0 ... 1300 C with Pt. 100
Manual : 0... 1300 C in steps of 10 C
Measuring
Cycle (t90)
< 2 seconds
Reproducibility
± 0.1 % FSD
I/P Imped.
> 1012Ω
O/P Signal
4.. 20 mA load 725 Ω, at 30V D.C. galvanically isolated 425 Ω at 24V D.C.
Mes. error
Output signal: ± 0.1 mA
pH measurement: ± 0.2% FSD
ORP measurement: ± 3mV FSD
Linearity
0.1%
Calibration
Computer assisted 1 or 2 point calibration
 Any of two cal. solutions within 0-14 pH for the Zero and slope.
 Any 1 calibration solution within 0-14 pH for the Zero (asymmetry
potential)
Zero adj.
asymmetry
potential
± 2 pH for glass electrodes.
± 5 pH for antimony electrodoes
2
Slope adj.
70-110% of the theoretical slope for glass electrodes.
70-120% of the theoretical slope for antimony electrodes.
Storage of
measured
values
Last measurement is retained during calibration and
programming
Indication
3 1/2 digit LCD 18-mm height.
Data I/P
Sealed touch keyboard with 4 keys.
Electrical connections
Model 8965 H : Power supply = 15.5 V<U<32V.
Current 20 mA min.
Model 8965 H Ex : In order to meet the specifications for intrinsic safety, the
auxiliary power must be supplied by a certified, intrinsically safe power supply.
Protection "ia" or "ib" U≤30 V icc ≤ 100 mA, linear.
Protection "ib" U≤30V icc ≤ 25mA, nonlinear.
At 30 V, permissible load is 725 Ω as shown by the following equation :
U-15.5
R = -------------0.02
R = load in Ω
U = Supply voltage in V.
3
Enclosure
Material
Epoxy coated cast aluminum
Protection
IP65 as per DN 40050 Nema4;
for wall mounting
Dimensions
165Hx165Wx93D mm
200Hx165Wx93D mm with installed cable gland
Cable glands
2 Nos 1/2 " NPT, material SS
Storage temp.
- 20.... + 70 oC
Ambient temp.
- 10... + 50 oC
Weight
1.9 kg
Packaging
5 ply corrugated box
4
1.3 Operating Principle
The two wire transmitters are charecterised by only two leads serving both as a source
of power supply and a means for analog signal transmission. The analog signal is in the
form of a 4.. 20 mA DC current.
The entire hardware is structured as functional modules assembled together. The DC
power supply is converted in split supplies required to drive the processing circuit
through a Power pack assembly which is potted for environmental protection and a
long sustained life. The potential of the electrodes which represents the process
parameter is processed by a high impedance amplifier. The amplifier is situated either
inside the transmitter thereby offering high input impedance or can be a "separated
external module" which gives output at low impedance. The selection of version is
dependent upon the distance required between the electrode and the transmitter.
If the distance between transmitter & electrode is less than the length of electrode
cable the integral buffer version is suitable. The length of the electrode cable varies
depending on the type of electrode or the cable that has been specified in the order. It is
typically 3 mtrs, 5 mtrs & 10 mtrs. If the distance of the transmitter from the electrode is
greater than the cable length then the external buffer version is required.
A special Analog to Digital converter digitises the analog voltage suppressing noise
signals, thereby providing for more accurate pH and temperature measurements.
The digital data is further processed by a dedicated microprocessor to perform
auxiliary functions as display, retransmission output generation, calibration, enabling
programming and co-relating programmed data to actual processing. The results are
displayed on a 3 1/2 digit LCD display. The application specific parameters such as
measuring range, calibration mode and type of temperature compensation are field
programmable.
The block diagram shown in FIG. I gives a clear picture of data routing and different
functional blocks interconnected.
5
Galvanic Isolation
I+
LCD Display
+ 4.5V
0V
EEprom
Eprom
Power Supply
- 4.5V
OPTO
Microprocessor (CPU)
Keyboard
Impedance
Transformer
Optical
Transmitter
Coupler
Optical
Receiver
Output Signal
4...20 mA
A/D Converter
Impedance
Transformer
I-
Temperature Input
pH / mV Signal Input
Fig 1 : Block Diagram
6
2 Getting Started
2.1 Included Items
When you unpack the carton, use the following checklist to make sure that all of
these critical components are present:
1. Transmitter
1 no.
2. Instruction Manual
1 copy
3. 2" NB Pipe mounting kit consisting of
I.
Pipe mounting bracket (integral with transmitter) 1 no.
II.
M6 x 20 L bolts 4 nos.
Used to fit bracket
III.
M6 spring washers
4 nos.
With transmitter
IV.
M6 hex nuts
4 nos.
V.
'U' clamps
2 nos.
Integral with
VI.
M8 hex nuts
4 nos.
each other
VII. BSW washers
4 nos.
}
}
2.2 What You Need
1)
2)
3)
4)
5)
6)
7)
3 1/2 digit multimeter
pH/ RTD calibrator
Screw driver blade width 6 mm.
Instrument screw driver blade width 3 mm.
Spanner for M6 nuts.
Spanner for M8 nuts.
Spanner for 25A/F for cable glands.
2.3 Mounting
The transmitter can be mounted either on wall or on a 2" NB pipe.
2.3.1 Wall mounting
The casting has 4 holes in four corners as shown in FIG 2.1. The transmitter can be
installed in sequence as follows. Since unit has factory fitted wall mounting bracket,
it needs to removed for mounting on external wall
I. Drill 7 MM through holes in the suitable plate on which the transmitter is to be
mounted.
II. Hold the unit flat on the mounting plate and insert M6 x 20 L bolts through the
four corner holes.
III. Fix 4 nos. of M6 spring washers and nuts from the rear end of the mounting
plate.
IV. Hold the nuts and tighten the bolts with the help of suitable spanner. This
completes mounting the transmitter in place.
7
165 mm
150 mm
polymetron
165 mm
150 mm
Z
Select
Enter
MONEC
35.50 mm
35.50 mm
8965
1/2" NPT SS
CABLE GLAND
FIG 2.1 : Wall mounting of Transmitter
2.3.2 Pipe mounting
The 2" NB pipe mounting kit is supplied along with the Transmitter unit which could be
used to mount the transmitter on a 2" NB pipe.The dimensional details of pipe mounting
arrangements are as shown in FIG 2.2. The sequence of mounting is as follows :
I.
Hold the transmitter and the mounting bracket firmly on a pipe and insert 2 nos. of
'U' clamps through the mounting bracket.
II.
Fix the mounting bracket firmly on the pipe using 5/16" washers and M8 nuts.
III. Ensure that the transmitter and the mounting bracket are held properly on the pipe.
This completes pipe mounting of the transmitter.
8
6
2
7
3
51
1
3
2
6
4
FIG 2.2 (A) : Horizontal pipe mounting of transmitter (SIDE VIEW)
6
2
7
3
51
3
1
2
6
4
FIG 2.2 (B) : Vertical pipe mounting of transmitter (TOP VIEW)
1
:
MONEC transmitter
2
:
M6 x 20 Bolts to fix transmitter to mounting bracket.
3
:
M8 hex nuts and 5/16" washers to fix 'U' clamps to
mounting bracket.
4
:
Mounting bracket
5
:
Standard 2" NB pipe
6
:
M6 hex nuts and M6 spring washers to fix
transmitter to mounting bracket.
7
:
'U' clamps to hold transmitter on mounting bracket
to standard 2" NB pipe
9
2.3.3 Mounting of external buffer amplifier
With models 8965 L and 8965 L-Ex, a separate buffer amplifier module is required.
The external buffer amplifier is housed in a wall mounting type casting with two holes of
4 mm dia. at diagonally opposite corners which can be seen after opening the lid on the
module. The buffer case should be mounted on a plain surface with the help of 2 nos. of
M4 x 15 CH/HD screws, spring washers and hex nuts. FIG 4 shows the locations of
these mounting holes.
Mounting Holes
Mounting Holes
FIG 4 : Mounting of external buffer amplifier
10
2.4 Electrical connections
All the cables should be routed through the cable glands and rubber seals of the glands
before the wires are terminated on the connectors. Care should be taken to avoid
mechanical damage while stripping the cables.
The cable for pH sensors consists of a screw cap socket at one end. Thread this onto
the threads on pH electrode. The other end contains the wires to be connected at the
transmitter end. The fig 5 shows this end to identify the proper wires.
Sheath
Conducting
Layer (BLACK)
Shield
(Ref. Electrode)
Insulation
Conductor
(Glass Electrode)
FIG 5 : Electrode Cable - Transmitter Connection End
As seen in figure, the cable has a conductive layer between shield and the insulation.
This layer needs to be peeled off such that there is sufficient distance between the
glass wire and the layer.
In case of pH sensor 'Polymetron' make, type '8350' the temperature sensor is inbuilt.
This electrode has an integral cable containing the lead wires of pH sensor and Pt100
temperature sensor. The sensor with its integral cable is shown in Fig6.
11
Glass ( Core of inner cable)
Ref. (Shield of inner cable)
Pt100 (2 wires)
FIG 6 : ‘Polymetron’ make, 8350 electrode
2.4.1 Electrical connections for 8965H & 8965 H-Ex
Once the instrument is suitably mounted, open the transmitter by unscrewing 2 Nos of
knurled captive screws on the transmitter. Shown below in fig. 7 is a part view of the
PCB which you will observe an opening.
1
High Mes
Ref
Pt 100
2
3
Bo3
ImA
Ref
4
5
6
Bo2
FIG 7 : Electrical connections for 8965H, 8965H-Ex.
(Integral buffer amplifier versions)
12
7 8
Bo1
2.4.1.1 Sensor Connections
Connect the 'measuring electrode' (also called as glass electrode) wire of the pH
sensor to the Bo3 terminal. The B03 terminal is made of Teflon base with screw
terminal at top, where the wire is to be connected.
While connecting, guide the pH sensor cable through the cable holder and clamp it by
the cable holder nut.
Ensure that the 'measuring electrode' wire is not shorted to this clamp.
Connect the remaining wire as given below :
Terminal No.
Wire Description
2
Reference electrode wire of pH sensor
3
Pt 100 (one end)
4
Pt 100 (Other end)
13
2.4.1.2 Power supply connections
From the terminals 6,7 & 8 wires have been routed internal to the transmitter to a 3 way
terminal block as shown in fig. 8.
I mA.
+
6
7
8
+
Terminal Block
On Case Casting
FIG 8 : Power Supply Connections for 8965H/H-Ex
Connect the transmitter power supply wires at the terminal block.
Being a 2 wire transmitter the current o/p is available through these same terminals.
14
2.4.2. Electrical connections for 8965L / L-Ex
In these models an external buffer amplifier is provided. Open the lid of buffer amplifier.
Shown in fig 9 is the view observed on opening cover.
-V
Out
Ref
+V
Terminal for
glass electrode
( Measuring electrode )
IN
Ref
Pt 100
Pt 100
Pt 100
Pt 100
Towards
8965L / L-Ex
From pH & Temp.
Sensor
FIG 9 : External Buffer Amplifier connections
Also open the transmitter by unscrewing 2 Nos of knurled screws on transmitter.
Shown in fig 10 is part view of PCB which is seen on opening.
15
MES
-V
+V
Ref
1
2
3
4
Ref
5
6
7
I mA
8
9
10
FIG 10 : Electrical Connections for 8965L, 8965L-Ex
(External buffer amplifier version)
2.4.2.1 Sensor connection
Refer Fig. 9
Connect 'measuring electrode' wire of pH sensor to IN terminal. The IN terminal is
made of Teflon base with a screw terminal at top where the wire is to be connected.
Connected the 'reference electrode' wire of pH sensor & the Pt100 sensor leads at the
respective terminals as indicated.
16
2.4.2.2 Inter connection between external buffer & transmitter.
This is done by means of 6 core cable and the connections should be made as per
wiring shown in Fig. 11.
8965 L/L-Ex
External buffer amplifier
7
Pt 100
6
Pt 100
5
Ref
4
Ref
+V
3
+V
-V
2
-V
out
1
Mes Lo
Pt 100
FIG 11 : Interconnection diag. between External buffer & 8965L/L-Ex
17
2.4.2.3 Power supply connection
From terminals 8,9,10 of 8965 L/L-Ex wires are routed, internal to transmitter, to a
3 way terminal block as in fig. 12.
8965L/L-EX Terminals
I mA.
+
8
9
10
+
Terminal Block
On Case Casting
FIG 12 : Power Supply Connection for 8965L/L-Ex
Connect transmitter power supply wires at the terminal block. Being a 2 wire
transmitter the current o/p is available through these same wires.
18
2.5 Commissioning the Product
 Ensure that the transmitter is mounted firmly on a panel or a pipe as required.
 Check all the connections of sensor and signal terminals.
 Tighten the nuts of the cable glands so that the cables are firmly gripped by the
rubber seal. This is necessary to prevent ingress of dust & moisture.
 Connect the buffer terminations properly to the transmitter in case of external buffer
versions.
 Ensure that the external buffer is mounted firmly.
 Calibrate the electrode to be used in process. For this operation read the section 3
of this manual thoroughly. Follow instructions given in the procedure calibration of
electrodes of the same section.
 Mount the sensor carefully in the process pipe or tank as per the application.
 Connect power to the transmitter and check the performance.
19
3 Operation and Maintenance
polymetron
Select
polymetron
Enter
Ex
Select
Monec
8965
Enter
Monec
8965
Intrinsically safe version
Non Intrinsic version
FIG 13 : Front Panel
Fig 13 shows the front facia for the transmitters. The "Ex" symbol indicates that the
instrument has intrinsically safe electronics.
The display is 3 1/2 digit LCD module.
The four nos. of keys can be grouped as
1) The Rollkeys
Increase the value
Decrease the value
In programming mode, upon first pressing the rollkeys, the selected values change
slowly in steps. After approximately 10 steps, the rate of change accelerates and the
desired setting is quickly reached.
20
2) The Select key
Pressing “Select” while in the measurement mode transfers the program into the
display mode. Once in this mode, various parameters can be retrieved and read but no
changes are possible.
Simultaneous pressing of “Select” and “Enter” keys activates the programming
mode. In this mode, desired parameters can be chosen with “Select key”. The whole
program can be scrolled by pressing “Select key” continuously.
3) The Enter key
This key returns the program into measurement mode after storing the programmed
settings. If “Enter” is pressed during calibration, the latest measurement data is
displayed.
3.2 Operating modes
The instrument offers 3 different operating modes.
Programming mode : This mode can be enabled by pressing “ Select " and " Enter "
keys simultaneously. The prompt " Pr " indicates that programming mode is invoked.
Display mode : By pressing " Select " key alone enables entry in display mode. In this
mode, all the operating parameters can be " read only " and no alterations are possible
in any operating parameter.
Measurement mode : In this mode, the instrument carries out routine measurements
according to operating parameters programmed. In order to enter programming mode
at any point of time, " Select " and " Enter " keys need to be pressed simultaneously.
Note : Whenever programming is aborted to enter measurement mode, a prompt
" MES " appears on the display for some time before displaying measured parameter.
21
3.3 Programming
The programming is done with that 4 keys on the front facia. Various fonts displayed
during the programming are shown in the following table to help understand the mode
and parameter to be programmed.
LEC
Operating mode "display”
Pr
Operating mode "programming"
Std
Standard glass electrode
Sb
Antimony electrode
rEd
ORP electrode (Redox electrode)
CAL
Calibrate the pH electrodes
E1
Calibration solution 1
E2
Calibration solution 2
PAr
Display the calibration parameters
(asymmetry in pH units, slope in%)
ECH
Measuring ranges assigned to the outputs
InF
Lower end of range (output 4 mA)
SuP
Upper end of range (output 20 mA)
t0C
Temperature measurement & compensation
Aut
Automatic temperature compensation and
measurement with Pt 100
MAn
Manual temperature compensation with fixed reference.
MES
Operating mode "Measurement”
Note : Please note that pressing of “Select” key alone will enable "Display" mode
wherein alternation of any parameter is not allowed. In order to invoke
"Programming" mode, both “Select” and “Enter keys” need to be pressed
simultaneously. The sequence of programming is illustrated in the flowchart in FIG 7.
22
Press “SELECT” and “ENTER” keys
simultanously
START
Displays “Pr”
Select type of electrode
Std
Std
Sb
Sb
rEd
rEd
No
Yes
Enter ?
Displays “MES”
Return to measurement mode
Select ?
A
Continued
23
A
Values shown in this
flowchart are indicative
only
Displays “CAL”
Set value of calibration
solution 1
Flashing Arrow Indicates
that calibration adjustment
is possible
4.00
No
No
Enter ?
Select ?
Yes
Without calibration
Yes
Displays “E1”
Set value of calibration
solution 2
9.00
D
C
24
Continued
B
C
D
No
Enter ?
B
Yes
Select
Yes
No
One Point Caliberation
Displays “E2”
No
No
Enter ?
Yes
Select ?
Yes
Two Point Caliberation
Displays “MES”
Displays “PAr”
Return To Measurement Mode
No
No
Enter ?
Yes
Select ?
Yes
Displays the
asymmetry & slope
parameters
alternately
1.00
Asymmetry
100
Slope
Displays “MES”
E
Return To Measurement Mode
25
Continued
E
Displays “ECH”
Displays “Inf” first
and then “SuP”
Select measurement
range
Select lower & upper
ends of measurement
range
10.00
2.00
12.00
No
No
Enter ?
Select ?
Yes
Yes
Yes
Enter ?
No
Displays “MES”
Return to measurement mode
Yes
F
Continued
26
Select ?
No
F
Displays “t°C”
Yes
Select ?
Select mode of temp.
measurement
and compensation
No
Aut
Man
Return to electrode
selection at
START
Yes
Enter ?
No
Displays “MES”
Select ?
Return tc
measurement
mode
F
Continued
27
G
Automatic
Manual
Press “Select” and “Enter” keys
simultaneously to update temperature
in “Auto” mode
Set the temperature
Set the temperature
10°
No
18°
Enter ?
No
Yes Yes
Enter ?
Displays “MES”
Return to
measurement
mode
No
Select ?
Yes
Yes
Return to electrode
selection at
START
28
Select ?
No
3.3.1 Programming step
The programming mode is accessed by simultaneously pressing Select and Enter.
The symbol:
Pr
appears
3.3.1.1 Selecting type of electrode
Using the rolikeys, choose any one of 3 electrode types
! Glass electrode
! Antimony electrode
! ORP electrode
Pressing Select confirms the choice and moves the program to the next step.
3.3.1.2 Calibrating for the electrodes
Calibration entails the comparison and adjustment of the measured pH with that of a
known buffer solution or a process solution of an accurately known pH. Either one or
two calibration solutions may be used.
At the start of the calibration mode, the symbol
CAL
appears, followed by the display of the measured pH. At the same time, a flashing
arrow indicates that the instrument is in the programming mode.
1 0.05
29
Now immerse electrodes into a buffer solution. Wait for the pH reading to stabilize.
Using the rollkeys, adjust the display until the indicated pH corresponds to the pH of the
buffer solution.
Do not press select at this stage, as the instrument will advance to next step of
program, without any calibration. Press enter The symbol El appears temporarily,
followed by display of corrected pH value.
There are now two options:
1. Single-point calibration (any one buffer)
Confirm with Select to fix the adjusted pH value. During the course of this calibration,
the instrument determines that :
a)The deviation of the zero is within the factory-set limit of ±2 pH units for glass
electrodes or ±5 pH units for antimony electrodes. In this case, the actual zero is
calculated and the calibration is accepted. The instrument automatically advances to
the next step of the program. (if, at this point, you prefer to return directly to routine
measurements (measurement mode), simply press Enter.)
b)The deviation of the zero is in excess of the factory-set limits. In this case, a
correction is not possible; the symbol Er1 appears in the display. For routine
measurements, the instrument will use the theoretical zero=O mV. Since the risk of
substantial errors is very real, it is better to repeat the calibration with new electrodes
and/or fresh buffer solution.
30
2. 2-point calibrations with any of two buffers
(Choose buffers whose nominal pH values are substantially different. The pH value of
the second buffer solution can be either greater or less than the pH value of the first .)
Immerse the electrodes into the second buffer solution. Using the rollkeys, adjust the
pH until it corresponds to the pH of the Confirm by pressing Enter. Now the symbol E2
appears temporarily, followed by the corrected pH. Press Select to display the
asymmetry potential and the slope.
During the course of this calibration, the instrument determines that :
a)The deviation of the slope is within the factory-set limit of 70-110% for glass
electrodes or 70-120% for antimony electrodes. In this case, the actual slope is
calculated and the calibration is complete. Press Enter to return to routine
measurements (measurement mode).
b)The deviation of the slope is in excess of the factory-set limits. In this case, a
correction of the slope is not possible; the symbol Er2 appears in the display. Since
the risk of substantial errors is very real, it is better to repeat the calibration with new
electrodes and/or fresh buffer solution.
ORP electrodes are not calibrated. The transmitter functions as a milli voltmeter
indicating absolute mV values.
Buffer Solutions :
The pH of buffer solutions is dependent upon the temperature, e.g., the nominal
pH values are referred to a temperature of 20 Deg.C. For temperatures other than
20 Deg.C, the calibration with the buffer solution must be done at the sample
temperature.
31
3.3.1.3 Displaying the parameters
This program step displays the deviations of the asymmetry potential and the slope
from their respective nominals.
The symbol
PAr
appears and the actual deviations for the zero and the slope are displayed alternately.
The signs "+" or "-" indicate either a positive or a negative deviation of the asymmetry
potential. The % slope deviation is expressed with respect to the theoretical slope of
59.2 mV/pH at 25 Deg. C.
In the display mode, these parameters appear immediately after the display of the
electrode type.
3.3.1.4 : Selecting span of measurement
Depending upon the type of electrode, the following ranges are available :
a) Glass electrode
: 2-5-10-14pH
b) Antimony electrode : 5-10-14 pH
c) ORP electrode
: 500-1000-20OOmV
Select and confirm with Select.
Whatever the selection, the measuring range always refers to the range appearing at
the analog output.
32
3.31.5 Selecting working range
The symbols
InF
and
SuP
indicate alternately the lower and upper ends of the range.
Measuring Ranges
pH
2
pH
5
pH
10
pH
14
500
mV
1000
mV
2000
mV
0-2
0-5
0-10
0-14
-1500
-1000
-1500
-500
-1500
+500
1-3
2-7
2-12
-1250
-750
-1000
0
-1000
+1000
2-4
3-8
4-14
-1000
-500
-500
+500
-500
+1500
3-5
4-9
-750
-250
0
+1000
4-6
5-10
-500
0
+500
+1500
5-7
6-11
-250
+250
6-8
7-12
0
+500
7-9
9-14
+250
+750
8-10
+500
+500
+1000
9-11
+750
+1250
10-12
+1000
+1500
12-13
12-14
33
3.3.1.6 Temperature compensation
In the display appears the symbol
Aut
or
MAn
for automatic temperature compensation with Pt100 or manual temperature
compensation with a fixed reference temperature.
Temperature Adjustment with Automatic Temperature Compensation :
By simultaneously pressing Select and Enter the symbol t IC appears, followed by the
display of the measured temperature. This value can now be adjusted to a nominal
value with the roilkeys.
Temperature Adjustment with Manual Temperature Compensation :
Confirm the adjustment with Select or Enter.
34
3.4 DO'S and DON'TS
! Don't ever try to adjust the potentiometers on CPU board.
! Don't leave the pH electrode dry.
! Don't expose the screw cap connector on the sensor to moisture.
! Don't press the keys too hard while programming.
! Do ensure that the transmitter and buffer are mounted firmly on panel or pipe as
application demands.
! Do use the same electrolyte as mentioned on the electrode while refilling.
! Do use the proper tools while removing / making electrical connections.
35
4 Fixing Problems
4.1 Troubleshooting
The MONEC transmitters being microprocessor based, offer self diagnostic and error
reporting feature. This feature enables the user to identify the possible cause of the
problem and decide the remedy for the same. The error messages and their meaning
are as listed below.
ERROR
MESSAGE
FAULT NATURE
ACTION
Er 0
Incorrect
programming
Check the parameters
programmed and correct wrong entry.
Er1
Asymmetry
potential exceeding
factory set limits
1) Recalibrate electrode :
2) If error still occurs after this
clean the electrode & again recalibrate.
3) If error still appears replace
electrode & calibrate again
Er 2
Slope potential
exceeding factory
set tolerance
1) Recalibrate electrode :
2) If error still occurs after this
clean the electrode & again recalibrate.
3) If error still appears replace
electrode & calibrate again
Er3
Pt 100 leads
shorted
Check the resistance between
Pt 100 leads and rectify or replace the
sensor
Er4
Pt 100 leads are
broken or
disconnected
Check the resistance between
Pt 100 leads and rectify or
replace the sensor
36
4.2 Current Output Calibration
The current output is factory calibrated and does not require to be adjusted
again. Hence carry out this operation only if you find that the current output is
outside the specified accuracy limits.
! Switch OFF the instrument.
! Press roll keys (increment & decrement keys) simultaneously and switch ON the
instrument.
! Release the keys when message 'lout' appears on display.
! This message is followed by display '4' (represents setting of 1=4 mA) and is
immediately followed by a display of coefficient.
! Measure current output on current meter (The meter is to be connected in series with
power supply & transmitter) Press increment or decrement key to increase or
decrease the current output so as to get 4 mA reading on the meter.
! Press 'select' key.
! Message '20' is displayed and is followed by display of another coefficient.
! Press increment or decrement key to get 20 mA reading on meter.
! Press 'select' key.
NOTE:
i)Reprogram the instrument in the desired configuration as all previous settings are
altered by the above operation.
ii)Recalibrate for the sensor as the previous sensor calibration is also disturbed.
37
4.3 Spares
Part code No.
Description
C2013711
CPU board assembly
C2013737
Power supply board assembly 8965 L
C2013713
Power supply board assembly 8965 L-Ex
C2013725
Power supply board assembly 8965 H-Ex
C2013723
Power supply board assembly 8965 H
C2013785
External Buffer PCB assembly
(applicable in 8965 L/L Ex models only)
C2018807
Cable gland assembly
C2013775
Instruction manual
38
4.4 Service
If you still need help, please contact your nearest Forbes Marshall representative. The
addresses and contact numbers of our major branches are listed on the back of this
manual. They'll be happy to direct you to any representative in your area, or provide
service themselves.
Please record all instances of field service problems and actions taken in the space
below:
Product Serial Number :
Date
Problem
Action Taken
39
Serviced by
4.5 Field Service Report
This form should be used to report field problems. A copy should be filled out by your
Forbes Marshall customer service engineer. Any servicing which requires the product
to be sent back to Works cannot be completed without this report. If the product is
returned to our Works, you should include either the original excise gate pass or our
invoice number and date.
If you'd prefer an estimate before proceeding with repair:
You should clarify on the form whether you would like to have the cost estimate before
we make any necessary repairs. If you indicate that an estimate is required, our Works
Engineer will complete Part 6 of the form and return it to you. If this estimate is
satisfactory, you should approve the estimate and return the approved form to your
Forbes Marshall representative. Only then will servicing proceed.
40
Forbes Marshall
Field Service Report
Report # :
Date :
Division
1) Customer Information
Customer Name :
Address :
Site
Contact Person :
Phone :
Reference:
2) Product Information
Product Description :
Serial Number :
Original Invoice #
Date :
Input/Inlet Details :
Output/Outlet Details :
The Product is
On-line
Off-line
Connections
Flanged
Screwed
Mounting Details :
3) Application Information
Process Media :
Pressure :
Temperature :
Sensor Details (If any) :
Mounting Details :
41
Welded
4) Observed Problems or Symptoms
5) Proposed Action
Repair at Site
Return to Works
Estimate First
0r Under Warranty
Field Engineer's Sign :Customer's Signature :
6) To be Filled in for Estimate Purpose
Estimated Cost :
List any imported spares which must be provided by Customer :
Signature of MFG/CSD Engineer.
7) Customer's Endorsement
We accept the above repair estimate
Signature & Stamp.
42
5 Notes
Notes
Notes
MANUFACTURING UNITS
PUNE - KASARWADI
PB 29 Mumbai-Pune Road, Kasarwadi
Pune - 411 034.
Tel : 020-27145754
DID : 020-27149012
Fax : 020-27147379
http://www.forbesmarshall.com/spirax
Solutions Engineering
If You Need Help...
PUNE - MIDC
A-34/35, MIDC, ‘H’ Block, Pimpri
Pune - 411 018.
Tel : 020-27442020
Fax : 020-27442040
[email protected]/spirax
http://www.forbesmarshall.com/spirax
HYDERABAD
Plot No. A-19/2 & T-4/2
I.D.A. Nacharam, Hyderabad - 500 076
Tel : 040-27152276 / 27170732 / 27171909 / 27153918
Tel : 040-27151664
Fax : 040-27173235 / 27179223 / 27152193
[email protected] / [email protected]
BRANCHES ACROSS INDIA
AHMEDABAD
4 Shetoor Bunglows
Opp. Drive In Petrol Pump
Near Chandandwar Hospital
T V Tower, Ahmedabad - 380 054
Tel : 079-26851738 / 26856374
Direct: 079-26859395
Fax : 079-26854014
[email protected]
DELHI - (Control Instrumentation Group)
Anupama Arcade, 2nd Floor
Opp. Samachar Apts.
Mayur Vihar, Extn. Phase 1
New Delhi 110 091
Tel : 011-22713485 / 22712902/3
Fax : 011-22710484
[email protected] /
[email protected]
ALIBAG
Pent House No. 1
Bafna Baug Complex-B
Behind Big Splash Hotel Chendhare
Alibag 404 201
Tel : 02141-223795(O)
Fax : 02141-223796(O)
[email protected]
HYDERABAD
Plot No. A-19/2 & T-4/2
I.D.A. Nacharam, Hyderabad - 500 076
Tel : 040-27152276 / 27170732 /
27171909 / 27153918
Tel : 040-27151664
Fax : 040-27173235 / 27179223 / 27152193
[email protected] /
[email protected]
BANGALORE
21 Coles Road, Cleveland Town
Bangalore - 560 005
Tel : 080-25483047/25485626/25484281
Fax : 080-25499971
[email protected]
CHANDIGARH
SCO # 77, Top Floor
Sector 38-C, Chandigarh
Tel : 0172-5080285
Fax : 0172-695098
[email protected]
CHENNAI
Plot #. 59, Montieth Rd.
Asha Mansion, Egmore
Chennai - 600 008
Tel : 044-28554493 / 28553011
Fax : 044-2855380
[email protected]
COIMBATORE
Flat No. 4C, Classic Garden Apts
1552/19 Trichy Rd.
Coimbatore - 641 018
Tel : 0422-2303679/22306015
Fax : 0422-2300072
[email protected]
DELHI - (Steam Engineering Group)
24, Laxmi Insurance Bldg.
Asaf Ali Rd., New Delhi - 110 002
Tel : 011-23232947/23232756
Fax : 011-23233762
[email protected]
JAMSHEDPUR
59, Rajendra Nagar
Jamshedpur - 831 001, Jharkhand
Tel : 0657-2437721
Telefax : 0657-2427983
[email protected]
KOLKATTA
5A Orient Row, Kolkatta - 700 017
Tel : 033-22407359 / 22835807 /22835809
Fax : 033-22475280
[email protected]
PUNE
PB 29 Mumbai-Pune Road, Kasarwadi
Pune - 411 034.
Tel : 020-27145754
Fax : 020-27147379
[email protected]
SURAT
7B Ground Floor, Navchetan Society
Opp. Krushimangal Hall, Ring Rd.
Surat - 395 007
Telefax : 0261-2651448, 2650896
[email protected]
VADODARA
10, Shreeji Krupa Society
Gotri Rd.
B/H Kalpavruksha Complex
Subhanpura P.O.
Vadodara - 390 023
Tel : 0265-2343733
Direct : 0265-2342234
Fax : 0265-2337930
[email protected]
VISAKHAPATNAM
403, Crescent Towers
Opp. Enadu, Seethammadhara
Visakhapatnam - 530 013
Tel : 0891-2552538
Fax : 0891-2535576
[email protected]
MUMBAI
107, Mahatma Gandhi Road
Mumbai - 400 023
Tel No : 022-2267 3821, 2267 3822
Fax : 022-22672970
[email protected]
REPRESENTATIVES
NAGPUR
50,ASHA 2nd Floor
Lendra Park, New Ramdaspeth
Nagpur - 440 010
Tel : 0712-2539386
Telefax : 0712-2549851
[email protected]
Indore
36/A, Narmala Nagar
Annapurna Rd., Indore - 452 009 (M.P.)
Tel : 0731-5058030
Cellular : 0731-3102220 /
098260-17398
NAVI MUMBAI
“Ellora” Sector 14 /Plot No.45
Opp. Marathe Bhavan
Vashi, Navi Mumbai - 400 705
Tel : 022-27666157/27655969
Fax : 022-27881533
[email protected]
BHOPAL
MIG 24/2A, Saket Nagar, Bhopal
Tel : 0755-2582710
Cellular : 098261-62047
MADURAI
55, LIG Colony, K K Nagar
Madurai - 625020
PONDICHERRY
[email protected]
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