Hach POLYMETRON 9135 Operator's Manual

Operator Manual

POLYMETRON 9135
pH/redox measurement

221=191=035 - Revision N - 10/12/2007

Transmitter 9135 - pH/redox measurement

221=191=035 Issue. N Hach Ultra Analytics 09/2005

This instrument conforms to the European Directives :

- 89/336/CEE modified by the directive 93/68/CEE

- 73/23/CEE modified by the directive 93/68/CEE

Warning !

There are no user-serviceable parts in either the transmitter or sensor. Only
Hach Ultra Analytics personnel or their authorized representative should attempt repair of
the system and only components expressly approved by the manufacturer should be
used. Any attempt to repair the instrument in contradiction of these guidelines may result
in damage to the instrument and injury to the person making the repair. It will also void the
warranty and may compromise the safe operation, electrical integrity or CE compliance of
the instrument.

Hach Ultra Analytics

6 route de Compois – CP212

CH-1222 Vesenaz Geneva

Tél. + 41 22 855 91 00
Fax + 41 22 855 91 99

Dr. Bruno Lange GmbH & Co. KG

Königsweg 10 - D-14163 Berlin

Postfach 37 03 63 . D-14133 Berlin

Telefon 030 - 809 86 - 369
Telefax 030 - 809 86 - 283

Note :

This equipment has been tested and found to comply with the limits for Class A digital
device, pursuant to Part 15 of the FCC Rules. 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 likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.

Precautionary Labels :

Read all labels and tags attached to the instrument. Personal injury or damage to this
instrument could occur if not observed.

This symbol, if noted on the instrument, references the instruction manual
for operation and / or safety information.

Electrical equipment marked with this symbol may not be disposed of in
European public disposal systems after 12 August of 2005. In conformity
with European local and national regulations (EU Directive 2002/96/EC),
European electrical equipment users must now return old or end-of life
equipment to the Producer for disposal at no charge to the user.

Note : For return for recycling, please contact the equipment producer or
supplier for instructions on how to return end-of-life equipment for proper
disposal.

Important document. Retain with product records.

!

Restriction of Hazardous Substances

Not

e:

The following only applies to exports of the product into the People’s Republic of China.

Marking

Products contain toxic or hazardous substances or elements.

Environment Protection Use Period Marking (years).

Toxic or Hazardous Substances and Elements

Part Name

Lead

(Pb)

Mercury

(Hg)

Cadmium

(Cd)

Hexavalent

Chromium

(Cr VI)

Polybrom

Biphenyls

(PBB)

Polybrom

Diphenyls

(PBDE)

Transmitter box X

CPU PCB X O

Power PCB X O

Relay PCB X O

Module X

O: Indicates that this toxic or hazardous substance contained in all homogeneous material for
this part is below the limit requirement

X: Indicates that this toxic or hazardous substance contained in at least one of the
homogeneous materials used for this part is above the limit requirement

Transmitter 9135 - pH/redox measurement

Page 1

Table of contents

1. General presentation of the 9135 transmitter ........................................................ 3

Presentation of the 9135 transmitter............................................................................3

Introduction....................................................................................................................4

Theory..............................................................................................................4

Redox measurement.......................................................................................5

Features.........................................................................................................................7

2. Installation of the transmitter..................................................................................11

Unpacking the 9135 transmitter.................................................................................11

Advice for installation..................................................................................................11

Mounting types ............................................................................................................ 12

3. Electric connections.................................................................................................15

Electronic board lay -out in the 9135 transmitter enclosure ......................................15

Main connection..........................................................................................................17

Probe connections.........................................................................................18

Probe/transmitter 9135 pH/red ox different links.................................. 18

Configurations of the cables................................................................20

Relation between colour-function........................................................ 22

Intermediary connection details (junctions).........................................23

4. Using the 9135 transmitter...................................................................................... 27

Utilization rules for the menus....................................................................................27

Modification of a value................................................................................................28

Measures display ........................................................................................................ 28

Main display.................................................................................................................29

Display options ............................................................................................................ 30

Choice of the language.................................................................................30

S/DISPLAY Menu..........................................................................................30

5. Configuration of the 9135 transmitter................................................................... 31

MAIN menu ..................................................................................................................31

CALIBRATION menu..................................................................................................32

pH calibration.................................................................................................32

Buffer solutions .............................................................................................. 32

Choice of the calibration type ....................................................................... 34

2 point calibration..........................................................................................35

Process calibration........................................................................................35

Values calibration..........................................................................................35

Slope and offset limits...................................................................................35

Temperature calibration................................................................................36

Calibration......................................................................................................37

Redox calibration...........................................................................................37

PARAMETERS Menu .................................................................................................38

HISTORIC Menu .........................................................................................................38

MAINTENANCE Menu ................................................................................................38

Transmitter 9135 - pH/redox measurement

Page 2

Redox PROGRAMMATION Menu.............................................................................39

S/MEASURE Menu ....................................................................................... 40

ELECTRODE......................................................................................40

TEMP. COMP.....................................................................................41

S/mA OUTPUTS Menu ................................................................................. 42

S/SPECIAL PROG. Menu.............................................................................43

TEST...................................................................................................43

S/ALARMS Menu .......................................................................................... 44

ALARM 1/2 (limit)................................................................................45

ALARM 3 (Alarm system)....................................................................46

ALARM 4 (Timer)................................................................................46

S/CONTROLLER Menu ................................................................................47

S/RS485 Menu .............................................................................................. 52

SERVICE Menu ...........................................................................................................53

S/IMPEDANCES Menu.................................................................................54

GLASS................................................................................................54

REFERENCE......................................................................................54

TEST...................................................................................................54

S/AVERAGE Menu........................................................................................55

S/DISPLAY Menu..........................................................................................55

S/CODE Menu...............................................................................................56

S/SOFT ISSUE Menu...................................................................................57

S/DEFAULT VALUES Menu.........................................................................57

S/mA ADJUST Menu ..................................................................................... 58

S/FACTORY menu........................................................................................58

6. Failures detection and error messages................................................................ 59

Failures detection........................................................................................................59

Electrode cleaning.......................................................................................................60

Maintenance................................................................................................................60

Error messages ........................................................................................................... 60

7. Impedance measurement........................................................................................ 65

Electrode impedance : electrode integrity index ....................................................... 65

Measurement principle...............................................................................................66

8. Analogue outputs and temperature control.........................................................69

Analogue outputs control............................................................................................69

Pt100 simulator connections ...................................................................................... 70

PH simulator connections...........................................................................................70

Appendix A : Default values..........................................................................................A1

Appendix B : Spare parts list........................................................................................B1

Transmitter 9135 - pH/redox measurement

Page 3

1. General presentation of the 9135
transmitter

Presentation of the 9135 transmitter

The 9135 pH transmitter and associated measuring
sensors has been designed for measuring and
continuous control of pH or redox potential (with
possibility of temperature measurement) in industrial
process.

An automatic control of the sensor defaults improves
the preventive servicing of the measuring chain.

2 analogue outputs (0/4 – 20 mA) may be freely
programmed.

Note :

The programming is displayed in 6 languages. To
modify this parameter see § 4 Changing the

programming language.

Four relays and RS485 are available in option.

Transmitter 9135 - pH/redox measurement

Page 4

Introduction

PH Measurement

Theory

pH is the negative logarithm of the hydrogen ion
activity and a measure of the acidity, or alkalinity of a
solution.

pH = - log a [H+]

pH is normally measured using a glass electrode and a
reference electrode.

The glass electrode acts as a transducer, converting
chemical energy (the hydrogen into activity) into an
electrical energy (measured in millivolts). The reaction
is balanced and the electrical circuit is completed by
the flow of ions from the reference solution to the
solution under test.

The electrode and reference solution together develop
a voltage (emf) whose magnitude depends on the type
of reference electrode, the internal construction of the
glass electrode, the pH of the solution and the

temperature of the solution. This voltage is expressed
by the Nernst equation :

E = Eo - (2.3 RT/F)xlog a[H+]
E = Eo -(slope) xlog a [H+]
where
E = the emf of the cell
Eo = the zero potential (isopotential) of the system :

depends on the internal construction of the

glass and reference electrodes
R = gas constant
T = temperature in Kelvin
a[H+] = activity of the hydrogen ion (assumed to be

equivalent to the concentration of hydrogen
ions)

F = Faraday constant

Transmitter 9135 - pH/redox measurement

Page 5

For every unit change in pH (or decade change in ion
concentration) the emf of the electrode pair changes
by 59.16 mV at 25°C. This value is known as the
Nernstian slope of the electrode.

The pH electrode pair are calibrated using solutions of
known and constant hydrogen ion concentration,
called buffer solutions. The buffer solutions are used to
calibrate both the electrode isopotential and slope.

Redox measurement

The potential which will be measured in a redox
system with a measuring chain consisting of a redox
electrode and a reference electrode is called the redox
potential. It depends on the ratio of activities of the two
partners of a redox system and of the numbers of
transferred electrons. In many cases the pH of the
solution will influence the potential, too.

Peters ‘s equation can determine the redox potentials.
The stability and reversibility of a redox system

strongly influence the reproductibili ty of the measured
redox potential.

Standard potentials of a redox system will be found for
aOx = a Red and for pH = 0 which corresponds again
to a standardized hydrogen ion activity aH+ = 1 mole
per litre.

Transmitter 9135 - pH/redox measurement

Page 6

The half-cell potential εB, of the reference electrode
will strongly influence the potential E of the measuring
chain. To remove this influence the potential of the

measuring electrode can be related to the hydrogen
electrode. If εB is the half -cell potential of the reference
electrode used, the calculation is made by

ε (H) = ε + ε R
Such standardized redox potentials to some extent

provide information on the oxidizing or reducing power
of a redox system. Increasing positive values express
an increasing power of oxidation. The more negative
the potential, the stronger the reducing power will be.

The range of practical interest is between +1500 and

-1000 mV.

Transmitter 9135 - pH/redox measurement

Page 7

Features

OPERATING CONDITIONS

Ambiant temperature -20°...+60°C
Relative humidity
Power supply voltage fluctuation
Over voltage category

Pollution degree
Altitude
Measurement category

10...90%
± 10 %

2
2 (as CEI 664)
< 2000 m
I (overvoltage less than 1500 V)

MEASURE

Display range

0 ... 14 pH (possibility to measure up to -3 pH)

-1500 mV.... 1500 mV

-20°C ... 200°C (-4°F...392°F)

Display resolution

0.01 pH / 0.1 pH (adjustable)
1 mV

0.1°C

Repeatability

± 0.02 pH
± 1 mV
± 0.2°C

Temperature sensor

Pt 100 / Pt 1000

Automatic temperature
compensation range

-20 ... 200°C

-4 ... 392°F

Temperature compensation range

Nernst
ultrapure water
different tables

Electrode type

- glass (with or without preamplifier)

- antimony

- redox

- programmable (slope + Uiso + pHiso)

Cable length

0 ... 25 m (high impedance)
0 ... 100 m (low impedance)

Sensor inputs

differential measurement

Input impedance

> 10 12 Ω

Impedance measurement

glass : 5M Ω .... 1G Ω

reference: 100 Ω ... 1M Ω

Transmitter 9135 - pH/redox measurement

Page 8

CALIBRATION

Calibration type

- NIST (4,00 ; 6,88 ; 9,22)

- DIN9 (4,00 ; 7,00 ; 9,00)

- DIN10(4,00 ; 7,00 ; 10,00)

- 2 points (manual)

- 1 point process

- values (slope and offset)

Slope matching

41 ... 71 mV to 25°C
70 ... 120 %

Zero matching

± 3 pH
± 250 mV

Temperature calibration

- 50°C...+20°C
(- 90°F...+ 36°F)

CONTROLLER

Setpoint

programmable in the range 0...14 pH or -1500 mV
... +1500 mV

Neutral zone

programmable from 0...3 pH or 0...200 mV symetric
around the regulating point

Proportional band

programmable from 0...500%

Periodicity

programmable from 3 to 60 seconds (impulse
control) or from 1 to 30 seconds (frequency control)

Controller output

2 isolated contacts S1 and S2
S1 : base injection

S2 : acid injection

Automatic/manual switch

possible

ANALOGUE OUTPUT

Output signals

2 galvanicly outputs insulated [ ]

Allocation

pH / redox / temperature

Type

0 ... 20 mA
4 ... 20 mA

Maximum load

800 Ω

Transmitter 9135 - pH/redox measurement

Page 9

Accuracy

0.1 mA

ALARMS

Alarm number

4

Function

- limits

- alarm system

- timer

Hysteresis

0 ... 10%

Temporization

0 ... 999 s

Breaking power
(on a resistive charge)

250 V AC, 3A max
100 V DC, 0,5A max

Use a cable (rated 105°C and AWG22 to 14). The
external cable insulation should be cut as close as
possible from the terminal block.

Response time

10 ms

Relaxation time

5 ms

RS485

Baud rate

300 ... 19200 bauds

Insulation

galvanic

Station number

32 max

PROGRAMMING

Language

French
English
German
Italian
Spanish
Dutch

Display

icones + graphic zone (80*64 pixels)

Protection codes

calibration
programming
service

Transmitter 9135 - pH/redox measurement

Page 10

ELECTRIC CHARACTERISTICS

Power supply voltage

• standard version :

- 100 V ... 240 VAC 50/60 Hz

• low voltage version :

- 13...30 VAC 50/60 Hz

- 18...42 VDC

Preamplifier

± 9 V DC

Connections

screw terminals 2,5 mm2

Consumption

25 VA

Fuse

5 x 20 cartridge
T2AL - 250V

European standards

- EN 61326-1997 and EN61326 A1-1998
(Industrial level for immunity)

- EN 61010 – 1 (low tension main lines)

UL and CSA agreement

- File E226594

MECHANICAL CHARACTERISTICS

Dimensions

144 x 144 x 150 mm

Weight

2 Kg

Material

housing : Polyester coated aluminium
screws : stainless steel

Tightness

IP65

Mounting types

wall
pipe
panel

Cable glands

2 * PG13 and shutter
2 * PG11 and shutter

Transmitter 9135 – pH/redox measurement

Page 11

2. Installation of the transmitter

Unpacking the 9135 transmitter

Inspect the package at the reception to detect an
eventual damage due to the transport. Make sure the
package contents are not damaged.

Check the package corresponds to your order :

• quantity delivered,

• type of instrument and version accordingly to the

instruction plates,

• accessories : 4 cable glands, 2 fittings and 2
mounting screws,

• instruction manual,

• certificate of conformity to specifications.

Advice for installation

Choose a site where :

• vibrations are not too excessive,

• supplay relays or commuters are away,

• la maintenance sera facile,

• the transmitter is not directly exposed to sunlight

and is not summited to atmospheric exposure.

Note :
It is preferable to mount the instrument above eye

level, allowing an unrestricted view of the front
panel displays and controls.

Transmitter 9135 - pH/redox measurement

Page 12

Mounting types

3 possibilities to mount the instrument (use of the red
clamping bow) :
The transmitter housing conforms to norm DIN 43700.

Panel mounting :

Panel cutting : 138 x 138 mm
Front panel dimensions : 144 x 144 mm

• 2 screws ∅ 4 mm lg 16 flat head (provided) for
panel thickness 0 to 4 mm

• 2 screws ∅ 4 mm lg 20 flat head (provided) for
panel thickness 4 to 8 mm

Fig 2.1 Panel mounting

Panel outline 138 x 138 mm (5.4 in. x 5.4 in.)

Front dimensions 144 x 144 mm (5.8 in. x 5.8 in.)

Thickness panel Inferior to 8 mm

Transmitter 9135 – pH/redox measurement

Page 13

Wall mounting :

• 2 screws ∅ 4 mm lg 60 flat head (not provided)/
80 mm center distance

Fig. 2.2 Wall mounting

Transmitter 9135 - pH/redox measurement

Page 14

Pipe mounting :

• ∅ 2" maximum - 2 screws ∅ 4 mm lg 60 (provided)

Fig. 2.3 Vertical mounting

Fig. 2.4 Horizontal mounting

Transmitter 9135 – pH/redox measurement

Page 15

3. Electric connections

Electronic board lay-out in the 9135 transmitter
enclosure

________________________________________________________________________

Fig. 3.1 Electronic board lay-out

1. Terminal block 4-20 mA

2. CPU board

3. RS485 board (option)

4. Relay board (option)

5. pH module

6. Programmed EEPROM

7. Program update connector

8. Power supply board

Transmitter 9135 - pH/redox measurement

Page 16

________________________________________________________________________
Fig. 3.2 9135 shielded plate

Supply terminals blocks and relays are under the
shielded plate.

Note :
Electrical connections should remain dry to

ensure a proper operation of the instrument.
Check the creeping of the cables when opening
the transmitter.

Il is required to use shielded cables. The shield
should be linked to the main shielding.

Transmitter 9135 – pH/redox measurement

Page 17

Main connection

Electrical connection should be performed only by
qualified personnel. The power supply accepts 100­240 VAC ± 10 %, (50/60 Hz) without changes in

configuration. The terminal block for power
connections can be lifted from its header for easier
installation. For safety reasons, it is required to
observe the precautions below :

• Use a three wire mains supply cable (2 core + PE)
with a cross section between 0.35 and 2 mm²

(AWG 22 to 14) rated at 105°C minimum. The
external cable insulation should be cut as close as
possible from the terminal block.

• The instrument should be connected to the power
supply by means of a breaker located close to the

instrument and be identified. The supply shall be
fitted with an overcurrent protection device rated at
20 Amp maximum.

• This breaker should switch off phase and neutral in
case of electrical problems or when the user wish
to service the instrument. However the power
supply earth must always be connected.

Note :
Before servicing the instrument, ensure that the

power supply is switched off.

Transmitter 9135 - pH/redox measurement

Page 18

Probe connections

Probe/transmitter 9135 pH/redox different links

Sensor/

probe

Sensor/probe

connections

Junction box

see p. 21

Links
with 9135
see p. 22

Distance

sensor/

probe-

9135

8340/44 P 8663/AS7/8495 internal 2666 25...100m

8340/44 AS9/AS7/8495.6.7 internal (HI) 2654 0...25m (*)

8346 AS7 + fixed wires

(for antimony
electrode and
temperature
sensor)

internal 2666 0...100m

8350 10m integrated " " 0...10 m(*)

8350.0/1/2/4 10m integrated 08350=A=8500
(HI)

2654 10...25m(*)

8350.0/1/2/4 10m integrated 08350=A=8000 2666 10...100m

8351 10m integrated " " 0...10m

8351 10m integrated 08350=A=8500

(HI)

2666 10...100m

8360.1P 8663/AS7/8495 Internal box 2666 25...100m

8360.1 AS9/AS7/8495 Internal box
(HI)

2654 3...25m

8360 AS9/AS7/8495 " " 0...3m
8361 10m fixed (for pH

and temperature
sensor)

" " 0...10m (*)

8361 10m fixed (for pH

and temperature
sensor)

08350=A=8000 2666 10...100m

8366 5 or 15m fixed " " 0...15m
8366 5 or 15m fixed 08366=A=5000 2666 15...100m

8370/80 AS9 (3/10 or 20m) " " 0...20m
8370/80 AS9 (3/10 or 20m) 08350=A=8000 2666 20...100m

Transmitter 9135 – pH/redox measurement

Page 19

LEGEND :
AS7 : Cable for reference electrode
AS9 : Cable for measuring or combined electrode
8663 : Cable AS9 + preamplifier for measuring or

combined electrode

2666 : Low impedance cable with 6 conductors +

shielding (ref 370=506=025).

2654 : Coaxial cable for high impedance link

(ref 358048,00000)

8495 : Pt100 temperature sensor with 3 m of fixed

integrated cable

8496 : Liquid earth rod with 2 m of fixed inegrated

cable

8497 : Pt100 temperature sensor with liquid earth rod

and 3 m of integrated cable
HI : High impedance
(*) : Impedance control with these configurations.

It can only be measured if the probe has a
conduction earth rod which can be connected to
the Liquid Earth terminal of the instrument. This
applies to the probes below :

* 8340/44 : If use of the 8496 earth rod or 8497

stainless steel temperature sensor.
* 8361 : Standard.
* 8350 : Use of the version :

8350.4 : with platinium liquid earth rod

Transmitter 9135 - pH/redox measurement

Page 20

Configurations of the cables

Description of cables used below. Numbers
correspond to the table § 2.4.3 where the wire colours
and functions are indicated.

• AS7 used with reference electrode

• AS9 used with a non-combined measurement

electrode

• AS9 used with a combined electrode and a
pH/8361 sensor cable

• 2666/8663/8497/ temperature sensor
8361/8495/8496 : shielded cable with 6/4/3/2 and

1 wire (see table colour-function relation)

or 1 wire

Transmitter 9135 – pH/redox measurement

Page 21

• 2654 high impedance cable used with a non-
combined electrode : shielded cable with a AS9
(for non-combined electrode) and 5 wires :

5 wires

• 2654 high impedance cable used with a combined
electrode : shielded cable with a AS9 (for

combined electrode) and 5 wires :

5 wires

• 8350 cable : shielded cable with AS9 for
combined electrode and 2 wires (3 wires for

8350.4 for impedance detection).

2 or 3 wires

• 8351 cable : shielded cable with AS9 for
combined electrode.

Transmitter 9135 - pH/redox measurement

Page 22

Relation between colour-function

The following table defines the relation between the
types of cable and their functions.

NC : for non combined electrodes
C : for combined electrodes

+ V - V Input Ref Temp+ Temp- Liq.

Earth

GND Earth

terminal*

2654
NC

- - (1) Red white purple yellow
/green

(3) (4)

2654 C - - (1) (3') white purple yellow

/green

- (4)

2666 brown grey green yellow white pink - *** (4)
8366 brown white green yellow grey ** ** - (4)

8350.0/
1/2

- - (1)

clear

(3')
black

white red - - (4)yellow

/green

8350.4 - - (1)
clear

(3')
black

white red blue - (4)yellow

/green

8351 - - (1)

clear

(3')
black

- - - - (4)yellow
/green

8361 (
pH +
temp

cables)

- - (1)
black

(3')
white

white red blue - (4)yellow

/green

AS9
NC

- - (1) - - - - (3) (4)

AS9 C - - (1) (3') - - - - (4)
AS7 - - - (2) - - - - (4)
8497 - - - - white green blue - (4)
8663 brown white green - - - - yellow (4) black

* The earth terminal located on the shielded

plate (see figure 2-1) should be connected to
the cable external shield. This connection
should be as short as possible.

** In cas e of direct link between 8366-transmitter,

realize a solder bridge GND-TEMP(-)- REF.

*** Connect GND to REF in the transmitter if

connection of the 08350=A=8000 preamplifier.

Transmitter 9135 – pH/redox measurement

Page 23

Intermediary connection details (junctions)

WARNING : It is required to cut the wires not used.

• Connection on preamplifier 08350=A=8000

Sonde

Transmetteur

• Connection for 08366=A=5000 enclosure and

internal for probes 8360.1P/ 8340P/ 8344P/8346

Sonde Transmetteur

Transmitter

Probe

external shield
+ V

GND

- V
INPUT
TEMP +
TEMP –

REF

external shield

+ V

GND

- V

INPUT

TEMP +

TEMP –

REF

Transmitter

Probe

external shield
TEMP -

TEMP +
REF

+ V

- V
INPUT

TEMP -

TEMP +

REF

INPUT

external shield

Transmitter 9135 - pH/redox measurement

Page 24

• Internal for probes 8340/44

* For non combined electrode

Sonde

Transmetteur

* For combined electrode

Sonde

Transmetteur

INPUT
GND

TEMP +
TEMP –
Liq. Earth

REF

INPUT

GND

TEMP +

TEMP –

Liq. Ea rth

REF

Transmitter

Probe

Transmitter

Probe

INPUT
REF

TEMP +
TEMP –
Liq. Earth

INPUT

REF

TEMP +

TEMP –

Liq. Earth

Transmitter 9135 – pH/redox measurement

Page 25

• For 08350=A=8500 enclosure

Sonde

Transmetteur

• For 8360.1 internal enclosure

Sonde

Transmetteur

external shield
INPUT

REF
TEMP +
TEMP –

Liq. earth

Transmitter

Probe

INPUT

REF

TEMP +

TEMP –

Liq. Earth

external shield

external shield
INPUT

GND
TEMP +
TEMP –

REF

INPUT

GND

TEMP +

TEMP –

REF

external shield

Transmitter Probe

Transmitter 9135 – pH/redox measurement

Page 27

4. Using the 9135 transmitter

Utilization rules for the menus

The user interface of the 9135 transmitter is made of a
display screen and 4 keys.

The (Esc) key is used to go back to the previous
menu.

The (Enter) key is used to validate the selections and
the data.

Both middle keys, right and left function keys, are
defined according to the words and symbols which are
displayed above each function key.

Modify a parameter

Choice Choose a menu

Main Go back to the main display

Menu Display the main menu

Disp2 Display screen 2
Disp3 Display screen 3

OK Validate the measure during a calibration

- Increase a value

+ Decrease a value

6.98

pH

25.0°C

Disp2 Menu

S1

S2 S3 S4

Transmitter 9135 - pH/redox measurement

Page 28

Modification of a value

The highlighted digit may be modified with the key

. Each digit can be validated by pressing

ENTER. Repeat both operations for each digit.

Note :

If you do not use the display for at least 10
minutes, the instrument returns to the measuring
mode except for the calibration and maintenance
mode.

An access code may be required for the
calibration, programming and service menu (see §
CODE menu).

Measures display

Measures display allow to display measures and state
of the device. There are three :

Reference

Description

•

Main display

‚

Alarm state

ƒ

Function keys

6.98

pH

25.0°C

Disp2 Menu

S1

S2 S3 S4 • ƒ ƒ ‚ ‚

Transmitter 9135 – pH/redox measurement

Page 29

Main display

6.98 pH : Ph measurement

25.0 °C : temperature measurement
S1...S4 : alarm state (invisible if alarm inactive)

Display 2

S1...S4 : Alarm state

S1 : activated by a temperature > 30.0°C
S2 : inactive

: S3 in alarm system

S3 unactived for temperature < - 20.0°C
S4 : not used

Display 3

Analogue outputs allocation :

measure or temperature.
Display of each output value with a bargraph + mA
indication.

6.98

pH

25.0°C

Disp2 Menu

S1

S2 S3 S4

S1 :
S2 : OK

:

S4 : Not used

Disp3 Main

S1

S3

°C > 30.0

°C <

-

20.0

I1 : Measure

I2 : Temp.

6.7 mA

10 mA

Main

Transmitter 9135 - pH/redox measurement

Page 30

Display options

Choice of the language

English is the default language. You can choose an
other language available (French, German, Italian,
Spanish or Dutch) by following the procedure below:

• Use the right function key MENU.

• Use the left function key (Select) to select the

menu SERVICE and press (Enter).

• In the menu SERVICE, use the left function key

(Select) to select DISPLAY and press (Enter).

• Select the language of your choice with the right
function key. Press (Enter).

S/DISPLAY Menu

− UNIT : choice of the pH measurement unit.

• pH

• mV (for the redox)

− TEMP. : choice of the temperature

measurement unit.

• °C

• °F

− LANGUAGE : choice of the message language.

• French,

• English,

• German,

• Spanish,

• Italian,

• Dutch.

• Press Esc to go back to the DISPLAY menu.

CALIBRATION
MAINTENANCE

PROGRAMMING

MENU

Select

SERVICE

IMPEDANCES
AVERAGE

CODE
SOFT ISSUE
DEFAULT VAL.
mA ADJUST

FACTORY

SERVICE

Select

DISPLAY

UNIT : pH
TDS : NO
TEMP. : °C

LANGUAGE :

DISPLAY

Select

F

Transmitter 9135 – pH/redox measurement

Page 31

5. Configuration of the 9135 transmitter

MAIN menu

The main menu gives access to 4 main functions of
the instrument :

• The CALIBRATION menu enables to adjust
the instrument measurement according to the

reference measurements.

• The MAINTENANCE menu enables to intervene
on the instrument.

• The PROGRAMMING menu enables to
program the instrument according to the

application.

• The SERVICE menu is reserved to qualified
servicing personal.

CALIBRATION
MAINTENANCE
PROGRAMMING

SERVICE

MENU

Select

Transmitter 9135 - pH/redox measurement

Page 32

CALIBRATION menu

pH calibration

In calibration mode, the temperature compensation
of the electrodes occurs systematically in the
temperature compensation mode according to the
Nernst law. The temperature measurement remains
active. If the automatic temperature compens ation is
selected, immerse the Pt100/1000 in the calibration
solution.

Buffer solutions

The pH of buffer solutions depends on temperature ;
the nominal pH values are referred to a temperature
of 20°C. For temperatures different from 20°C, NIST

standard buffer solutions, DIN buffers, and pH
values are indicated in the table below :

NIST

Delay Buffer 4,00 Buffer 6,88 Buffer 9,00

0

4,01

6,984

9,464

5 4

6,951

9,395

10 4

6,923

9,332

15 4

6,9

9,276

20 4

6,881

9,225

25

4,01

6,865

9,18

30

4,01

6,853

9,139

35

4,02

6,844

9,102

40

4,03

6,838

9,068

45

4,04

6,834

9,038

50

4,06

6,833

9,01

55

6,833

8,985

60

6,836

8,962

65

6,84

8,941

70

6,845

8,921

75

6,852

8,902

80

6,859

8,884

85

6,867

8,867

90

6,876

8,85

95

6,886

8,833

MAINTENANCE
PROGRAMMING

SERVICE

MENU

Select

CALIBRATION

Transmitter 9135 – pH/redox measurement

Page 33

DIN 9

Delay Buffer 4,00 Buffer 7,00 Buffer 9,00

0

4,05

7,13

9,24

5

4,04

7,07

9,16

10

4,02

7,05

9,11

15

4,01

7,02

9,05

20 4 7 9 25

4,01

6,98

8,95

30

4,01

6,98

8,91

35

4,01

6,96

8,88

40

4,01

6,85

8,85

45

4,01

6,9

8,82

50

4,01

6,95

8,79

55

4,01

6,95

8,76

60

4,01

6,96

8,73

65

4,01

6,96

8,71

70

4,01

6,96

8,7

75

4,01

6,96

8,68

80

4,01

6,97

8,66

85

4,01

6,97

8,65

90

4,09

6,98

8,64

DIN 10

Delay Buffer 4,00 Buffer 7,00 Buffer 10,00

0

4,05

7,13

10,26

5

4,04

7,07

10,17

10

4,02

7,05

10,11

15

4,01

7,02

10,05

20 4 7 10 25

4,01

6,98

9,94

30

4,01

6,98

9,89

35

4,01

6,96

9,84

40

4,01

6,85

9,82

45

4,01

6,9

9,78

50

4,01

6,95

9,74

55

4,01

6,95

9,7

60

4,01

6,96

9,67

65

4,01

6,96

9,65

70

4,01

6,96

9,62

75

4,01

6,96

9,58

80

4,01

6,97

9,55

85

4,01

6,97

9,52

90

4,01

6,98

9,49

Transmitter 9135 - pH/redox measurement

Page 34

The temperature of the buffer solution needs to be
entered only if the transmitter is operated in the
manual temperature-compensation mode.

In the « automatic calibration » mode the transmitter
determines the pH value according to the
temperature. In the other calibration modes, the
nominal pH values must always be taken into
account.

For a precise calibration of the pH electrode, 2 buffer
solutions are required one of which should have a
pH close to the sample pH. The pH 7 buffer solution
(or 6.88 to 25°C) is required for a first
standardization and a pH 4 buffer solution (or 4.01
to 25°C) or pH 10 (or 9.22 to 25°C) is required to
calibrate the electrode slope.

Choice of the calibration type

Different calibration types may be selected. In the
CALIBRATION menu :

• Press CHOICE to select pH standard.

• Press Enter.

• Press CHOICE to select PROGRAMMING

• With the right function key, choose the

calibration type.

Automatic calibration

With the right function key, select the buffer type you
use so that the instrument determines precisely the
buffer value according to the temperature.

You have the choice between three tables : NIST,
DIN 9, DIN 10 which corresponds to the standard

buffer values whose value varies according to the
temperature as indicated in the previous chapter
dedicated to the buffer solutions.

TYPE :
TAMP : NIST

Ph CALIB.

Auto

Transmitter 9135 – pH/redox measurement

Page 35

The user calibrates the pH measurement with 2 of
the 3 standard buffers from the table chosen :

− NIST : 4.00, 6.88, 9.22

− DIN 9 : 4.00, 7.00, 9.00

− DIN 10 : 4.00, 7.00, 10.00

The user does not enter any value during
calibration.

2 point calibration

Calibration type used when the user has no
standard buffer (4.00/6.88/9.22). The buffer value
remains the same to a constant temperature and

the user enters them only one time when he
programs the calibration.

Process calibration

Note :
Warning ! This calibration is only active on the

zero shift.

The user calibrates on one point using 1 buffer or
the sample to measure. The user needs to enter the
buffer or sample value for each calibration.

Values calibration

The user has calibrated his electrodes in the
laboratory. He programs the slope and zero values
(% of 59.16 mV/pH) he has measured in the
laboratory.

Slope and offset limits

An error message is displayed if the slope is not in­between [70 %, 120 % or offset in-between [-3 pH, +
3 pH].

See Chapter error messages and Troubleshooting

TYPE :
BUF1 : 3.75 pH

BUF2 : 8.05 pH

pH CALIB.

2pts

Select

TYPE :

pH CALIB.

Process

TYPE :
SLOPE : 102 %

OFFSET : 00.12 pH

pH CALIB.

Values

Select

Transmitter 9135 - pH/redox measurement

Page 36

Temperature calibration

To reach the temperature calibration screen, press
the EXECUTION mode with ENTER.

Once the measurement is stable, press OK.

Possibility to change the value.

Display of motion.

Note :
The temperature adjustment limits are between

- 50 °C and + 20 °C.

TEMP. CALIB.

EXECUTION

∆T : - 2,5 °C

P ress

ENTER

TEMP. CALIB.

6.8

°C

4.2 pH

TEMP. CALIB.

6.8

°C

06.8 °C

TEMP. CALIB.

Transmitter 9135 – pH/redox measurement

Page 37

Calibration

This menu is dedicated to the calibration of the
electrode used.

Press ENTER to validate the choice.

Redox calibration

Follow the pH calibration procedure in § 4.

Note :
In redox calibration the measure unit is mV.

LIMITS :

- zero shift : ± 250 mV

- slope shift : 70 … 120 %

TEMP CALIB.
PARAMETERS

CALIBRATION

Select

REDOX CALIB.

PROGRAMMING

REDOX CALIB.

Select

EXECUTION

Transmitter 9135 - pH/redox measurement

Page 38

PARAMETERS Menu

The date, slope and zero of the last calibration may
be displayed in the PARAMETER menu.

HISTORIC Menu

The slope and zero parameters of the last two
calibrations may be displayed in the historic menu.

Press the left function key SELECT to display the
next parameters.

MAINTENANCE Menu

When changing an electrode or servicing the
instrument, the transmitter continues to display
measures.

Note :
The analogue output value is the value

programmed in the mA menu. The relay state is

not modified.

DATE : 26/03/96
SLOPE : 95%
ZERO : 0,3 pH

∆T : 0,2°C

PARAMETER

DATE : 26/03/96
SLOPE : 98%

ZERO : -0,3 pH

HISTORIC

Select.

6.98

pH

26.4 °C

MAINTENANCE

Transmitter 9135 – pH/redox measurement

Page 39

Redox PROGRAMMATION Menu

Note :
Warning ! An access code may be required if

programmed.

This menu enables the configuration of the
instrument according to its application.

In this operating mode, the measurements, the
analogue outputs and alarms remain active.

ALARMS
CONTROLLER
mA OUTPUTS

RS485

PROGRAMMING

Select

MEASURE

Transmitter 9135 - pH/redox measurement

Page 40

S/MEASURE Menu

ELECTRODE menu allow to set up the electrode

model.
TEMP. COMP. menu allow to set up the

temperature compensation.

ELECTRODE

Choice of the electrode.

TYPE : • Glass

• Antimony

• Redox

• Other

ISO Pt : XX,XX pH
The isothermal point corresponds to

the pH value which does not vary

according to the temperature.
SLOPE : XX %
Indication of the electrode sensitivity

in % of the theoric value (59,16

mV/pH at 25°C).
Uiso : XXXX mV
Uiso is the potential of the isothermal

point.

TEMP. COMP. :

MEASURE

Select

ELECTRODE

TYPE :

ISO Pt : 1,5 pH
SLOPE : 95 %

Uiso : 200 mV

ELECTRODE

Redox

Transmitter 9135 – pH/redox measurement

Page 41

TEMP. COMP.

This menu allows to set up the temperature
compensation.

:

- No

- Pt

Choice of a temperature
measurement with or without
Pt100/Pt1000.

:

- Auto.

- Manual

Choice between an automatic or a
manual temperature
measurement.

: XX °C Possibility to enter the sample

temperature in a manual
compensation.

:

- NERNST

Choice of the temperature
compensation type :

- linear compensation
(0.1984 mV/°C).

- Pure - compensation according to the
ultrapure water curve.

- Matrix 1 - compensation according to the
sulphate curve (4.84 mg/l

corresponds to a pH 4.0 to 25°C).

- Matrix 2 - compensation according to the
ammoniac/hydrazine curve (0.272
mg/l ammoniac + 20 µg/l
corresponds to a pH 9.0 to 25°C).

- Matrix 3 - compensation according to the
ammoniac / morpholine /
hydrazine curve (1.832 mg/l
ammoniac + 10 mg/l morpholine +
50 µg/l hydrazine corresponds to
a pH 9.6 to 25°C).

- Matrix 4 - compensation according to the
phosphate curve (3 mg/l
phosphates + 0.3 mg/l
ammoniac).

Coeff. - adjustable coefficient (pH/10°C)

: XX In the case of a programmable

coefficient, possibility to enter the
value of the coefficient (value in
pH/10°C or pH/18°F).

MEASURE :
TYPE : Manual

TEMP. : 20°C
COMP. : Coeff.
∆. : 00.010 pH

TEMP. COMP.

Select

Yes

Transmitter 9135 - pH/redox measurement

Page 42

S/mA OUTPUTS Menu

This menu allow to adjust analogue outputs.

OUTPUT 1/2

− AFFECT : choice if the analogue output

allocated to measure or
temperature.

• pH/mV

• °C/°F

− TYPE : choice of the analogue output type.

• 0/20 mA

• 4/20 mA

− LOWER : lower limit value programming.

− UPPER : upper limit value programming.

OUTPUT 1
OUTPUT 2
SPECIAL PROG.

TEST

mA OUTPUTS

Select

AFFECT. :
TYPE : 0/20 mA
LOWER : 10.0 mS

UPPER : 20.0 mS

OUTPUT 1/2

Select

pH

Transmitter 9135 – pH/redox measurement

Page 43

S/SPECIAL PROG. Menu

This screen allow to adjust 4..20 mA outputs states
in special events.

− MAINTENANCE

− CALIBRATION

− SYST. ALARM

− TIMER

− MODE : choice of a preset value during

calibration, alarm system or
maintenance.

• last

• preset

• live

− VALUE : indication of the preset value 0 to

21 mA.

TEST

TEST menu test the analogue outputs by step

of 1 mA (0...21mA).

MODE :

VALUE : 00 mA

SPECIAL PROG.

Select

Preset

CALIBRATION
SYST. ALARM

TIMER

SPECIAL PROG.

Select

MAINTENANCE

VALUE :

TEST

Select

12 mA

Transmitter 9135 - pH/redox measurement

Page 44

S/ALARMS Menu

This sub- menu allows to reach the configuration of
alarms 1 to 4.

The MODE parameter allows to choose the
operating mode of the 4 alarms :

- Lim : alarms 1...4

- System : only alarm 3

- Timer : only alarm 4
MODE : • No

• Lim

• Syst

• Timer

ALARM 1
ALARM 2
ALARM 3

ALARM 4

ALARMS

Select

MODE :
ACCEPT : Manu

RELAY : NO

ALARM 3

Select

Sys

MODE :
INTERV. : 2440 mn

IMPUL. Nb : 1

Ton : 005 s
Toff : 005 s

TmA : 00 mn

ALARM 4

Select

Timer

Transmitter 9135 – pH/redox measurement

Page 45

ALARM 1/2 (limit)

− AFFECT : choice of a limit on the measure or

the temperature.

• no

• pH/mV

• °C/°F

− LIMIT : value of the limit.

− DIR : choice of the direction.

• Up

• Down

− DELAY : definition of the temporization when

the relay interlocking.

− HYST : definition of the limit hysteresis

thresholds on % (10% max).

− RELAY : choice of the relays normally open

or closed.

• NO

• NF

AFFECT. : Non
LIMIT : 20.3°C

DIR : Up
DELAY : 30s

HYST. : 10%
RELAY : NO

ALARM 1

Select

°C/°F

AFFECT. : Non

ALARM 2

Select

NO

Transmitter 9135 - pH/redox measurement

Page 46

ALARM 3 (Alarm system)

− Choice of a limit on the measure or alarm

system with alarm 3.
MODE : • No

• Limit

• Sys

− Manual or automatic acquit possible with the

alarm system.
ACCEPT : • Auto

• Manu

− Choice between relays normally open or closed.

RELAY : • NO

• NC

ALARM 4 (Timer)

− Choice between a limit on the measure or a

timer for the probe cleaning with alarm 4.
MODE : • No

• Limit

• Timer

− INTERV : interval between 2 cleaning cycles

in minutes.

− IMPUL. Nb : number of pulses during a cleaning

cycle.

− Ton : time when relay is activated, in

secondes.

− Toff : time when relay is desactivated, in

secondes.

− TmA : analog output hold time for the

analogue outputs in minutes.

MODE :
ACCEPT : Manu

RELAY : NO

ALARM 3

Select

MODE :
INTERV : 2440 mn
IMPUL. Nb : 1
Ton : 005 s
Toff : 005 s

TmA : 00 mn

ALARM 4

Select

Timer

Sys

Transmitter 9135 – pH/redox measurement

Page 47

S/CONTROLLER Menu

The built- in proportional controller, abbreviation
controller P. The controller output Y activates the
limit switch relays. Y value may correspond to a
control by impulse or a control by frequency. The Y
value is determined by the parameters below :

• A setpoint (W) : corresponds to the pH value to
control.

• A neutral zone (ZN) : may be programmed and
positioned symmetrically ± 50% about the
setpoint. Within this neutral band the control

element (valve, dosing pump) is always inactive.

• A proportional band (XP) : represents the
regulation slope. A XP value equal to 100% is

defined as a Y controlling value of 100% for a
5 pH (or 1000 mV in redox) drift according to the
neutral zone extremity.

• A power factor (Exponent) : which calculates a
controlling value from a lineary (exponent = 1) or
an exponential function.

The value of Y in pH corresponds to the equation
below :

5

])

2

ZN

+(W-pH[

*

XP

100

=Y

Exponent

Y value is represented as follows :

ZN

14.0 pH
+1500 mV

0.0 pH

-1500 mV

(XP=100%)

(XP=200%)

2.5

pH

(XP=50%)

100%

50%

0%

0.0 5.0

W

Y

Transmitter 9135 - pH/redox measurement

Page 48

Different controller modes are available. They
enable a frequency, a pulse or a mixed
pulse/frequency control. Relay S1 (base injection)
and relay S2 (acid injection) ensure the control. The
controller parameters are programmable via the
programming variables below :

CONTROLLER

− Choice to use an integrated controller :

CNTRLLR : • Yes

• No

− Choice of the control mode :

MODE : • Pulse S1 & S2 in pulse

control

• Freq. S1 & S2 in frequency
control

• Pul./Frq S1 in pulse control

/S2 in frequency
control

• Frq./Pul. S1 in frequency

control /S2 in pulse
control

− Value of the setpoint :

POINT : XXXX – In pH or mV

− Neutral zone range : zone around the setpoint

where the regulation is not activated.
NEUT Z. : XXX - In pH or mV

− Reaction time after activating relays S1 or S2 :

delay time after executing the next period.
INERTIA : XXX – In s

− Maximum time out of the neutral zone .After this

period and without returning into the neutral
zone, the system alarm “control too long” is
activated.

CTL TIME : XX – In mn

CNTRLLR : Yes
MODE : Freq.
POINT : 7.00 pH
NEUT. Z : 2.0 pH
INERTIA : 000 s
CTL TIME : 20 mn
RELAY S1
RELAY S2

MANUAL MODE

CONTROLLER

Select

Transmitter 9135 – pH/redox measurement

Page 49

Note :

Any default detected by the transmitter stops the

controller function.

The default "CONTROL TOO LONG" should be

manually released by pressing ENTER.
If the TIMER and CONTROLLER functions are

activated at the same time, the controller is

stopped during the timer cycle.
Any cycle calculated by the transmitter is carried

out to the end.

FREQUENCY CONTROL :

The pulse width is constant and programmable (0.1
to 0.7 s). The pulse period varies according to the
sample pH value.

Off

T T

T

Time

On

S3

Period ?

T

Transmitter 9135 - pH/redox measurement

Page 50

S1 & S2 RELAYS

− Proportionality coefficient : slope of regulation.

COEF.XP1/2 : XXX – In %

− Value of the pulse width (0,1 < T < 0,7) :

T1/2 : XXX – In %

− Minimum number of pulses per minute. Program

this value according to the control system
associated to the relay :

MIN : XXX – In i/min

− Maximum number of pulses per minute. Program

this value according to the control system
associated to the relay.

MAX : XXX – In i/min

MANUAL MODE

− Force relay S1 or S2 . Pressing the function key

associated to the relay, the relay is activated till
you release the key. The corresponding icon is
displayed according to the relay state.

PULSE CONTROL :

The pulse period is constant and programmable (3
to 60 s). It is the cycle quotient (α) which varies

according to the sample pH value.

Off

On

"

?

"

?

"

?

S3

T T T

COEF.XP1 : 100%
T1 : 2.00 s
MIN : 001 i/min

MAX : 200 i/min

RELAY S1

Select

COEF.XP2 : 100%
T2 : 2.00 s
MIN : 001 i/min

MAX : 200 i/min

RELAY S2

Select

7.00

pH

25.0 °C

CONTROLLER

S2 S1

Tps

Time

Transmitter 9135 – pH/redox measurement

Page 51

CONTROLLER

− Regulation form select

MODE : Pulse

S1 & S2 RELAYS

− Value of the pulse period (3 < T < 60) :

T1/2 : XXX In s

− Minimum activation time of the relay :

S1/2 MIN : XXX In s

− Value of the power factor. In the case of a non-

linear calculation of the control value, modify the
exponent value. This modification allows a
greater correction of the measurement when it is
far from the setpoint.

"PULSE/FREQUENCY" CONTROL OR
"FREQUENCY/PULSE" CONTROL

The controller may be programmed in a mixed
mode. Use the Mode command for the

programming. See paragraphs concerning the

frequency control and the pulse control to program
the relay S1 and S2.

CNTRLLR : Yes
MODE : Imp.
POINT : 7.00 pH
NEUT. Z : 2.0 pH
INERTIA : 000 s
CTL TIME : 20 mn
RELAY S1
RELAY S2

MANUAL MODE

CONTROLLER

Select

MODE : Pulse

COEF.XP1 : 100%
T1 : 2.00 s
S1 MIN : 1.0 s

EXPONENT : 01.0

RELAY S1

Select

COEF.XP2 : 100%
T2 : 2.00 s
S2 MIN : 1.0 s

EXPONENT : 01.0

RELAY S2

Select

Transmitter 9135 - pH/redox measurement

Page 52

S/RS485 Menu

This option requires the RS485 kit.

N° Monec number (0...32)
BAUD 300/600/1200/2400/4800/9600/19200

Transmission speed in bauds
PARITY - Without parity bit : No

- With odd parity bit : Odd

- With even parity bit : Even
STOP BIT - 1 bit stop

- 2 bits stop

SWAP WORD : - Allow to reverse the "strong
weight", "light weight" size during the manipulation
of the real variable (float type). Some equipments
need this reverse to read correctly the real size data.

The communication protocol is MODBUS/JBUS.
The instrument may be equipped with a RS485

board (optional) (see MODBUS 9100 manual).

N° : 4
BAUD : 9600
PARITY : odd
STOP BIT : 1

WORD invs. : YES

RS485

4

Transmitter 9135 – pH/redox measurement

Page 53

SERVICE Menu

Note :
WARNING ! An access code may be required if it

has been programmed.

This screen allows to reach the 9135 transmitter
configuration screens.

The display options are detailed page 27.

IMPEDANCES
AVERAGE
DISPLAY
CODE
SOFT ISSUE
DEFAULT VAL.
mA ADJUST

FACTORY

SERVICE

Select

Transmitter 9135 - pH/redox measurement

Page 54

S/IMPEDANCES Menu

Define the lower and upper limits of the electrode
impedances for the default detection. They should
be defined experimentally.

FREQ. : permits to define the impedance

measurement frequency (limits :
0,1 H to 24 H).

GLASS

Permits an impedance measurement.
The glass electrode impedance measurement is

compensated at 25°C.

REFERENCE

Permits an impedance measurement.
LOWER : defines the lower limit for the

impedance measurement. Th is limit
is used for the alarm system and
the bargraph DISP4.

UPPER : defines the upper limit for the

impedance measurement. This limit
is used for the alarm system and

the bargraph DISP4.

TEST

Visualizes the impedance measurement value.

GLASS
REFERENCE

FREQ. : 24.0 h
TEST

IMPEDANCES

Select

REF. : OUI
LOWER : XXXX

UPPER :XXXX

GLASS

Select

YES

REF. : OUI
LOWER : XXXX

UPPER :XXXX

REFERENCE

Select

YES

GLASS

XXX.XX

REFERENCE

XX.XX

TEST

Transmitter 9135 – pH/redox measurement

Page 55

S/AVERAGE Menu

Program a sliding average on the pH/redox
measurement.

AVERAGE : define the number of measures to

calculate the average.

TEST : visualize the difference between a

measure done with or without
average.

Note :
The measurement cycle lasts 4 seconds if there is

a temperature measurement and only 2 seconds
without temperature measurement.

S/DISPLAY Menu

This menu options are describes in page 27 of this
manual.

AVERAGE : 9
TEST :

AVERAGE

Select

TEST :

AVERAGE

6.98 pH
REAL

6.48 pH

TEST

Transmitter 9135 - pH/redox measurement

Page 56

S/CODE Menu

− CALIB. : access code for "temperature and

pH calibrations" menu.

− PROG. : access code for "Programming"

menu.

− SERVICE : access code for "service" menu.

Note :
If you have forgotten your access code, press

simultaneously ESC and ENTER to enter into the
menu.

CALIB :
PROG. : 0000

SERVICE : 0000

CODE

Select

0000

Transmitter 9135 – pH/redox measurement

Page 57

S/SOFT ISSUE Menu

The transmitter displays the type of instrument and
the software version installed.

S/DEFAULT VALUES Menu

Note :
If you press YES, you load the default values and

you loose the programmed values and the
calibration parameters.

MONEC 9135

pH X.XX

VERSION

Loading

default

values ?

VAL./DEFAULT

!

Yes

Transmitter 9135 - pH/redox measurement

Page 58

S/mA ADJUST Menu

In this menu, adjustment of the analogue outputs to
20 mA with an internal coefficient between -

9999...9999.

S/FACTORY menu

Factory code necessary.
The user has no access to this menu.

OUTPUT 1
OUTPUT 2

ADJUST mA

Select

VALUE : 0000

OUTPUTS 1/2

- +

Transmitter 9135 – pH/redox measurement

Page 59

6. Failures detection and error messages

Failures detection

Symptom Possible

cause

Remedy

Reading out of
scale

Faulty
transmitter

Check the transmitter by connecting a
pH simulator or a voltage generator
instead of the electrode

Faulty

electrode

Check the electrode operation with
buffer solutions

Electrode not

correctly
connected

Check the connections

Bubbles in the

bulb

Remove the electrode, shake it and put
it back

Unstable display Faulty

transmitter

Check the transmitter by connecting a
pH simulator or a voltage generator
instead of the electrode

solution not

earth grounded

Connect the electrode

Bubbles on the

pH bulb

Remove the electrode, shake it and put
it back

Slow drift

PH bulb
polluted

See cleaning instructions

Reference

clogged

See cleaning instructions

Low slope or
slow response

Buffers
polluted

Use new buffers

PH bulb

polluted

See cleaning instructions

Reference

clogged

See cleaning instructions

Faulty

electrode

Check the electrode operation

Transmitter 9135 - pH/redox measurement

Page 60

Electrode cleaning

Electrodes which are mechanically undamaged,
without any broken part, may be regenerated
according to the instructions below :

Salt deposits: Dissolve the deposit by immersing the
electrode in 0.1 M from HCL during 5 minutes,
following by an immersion of 5 minutes in a 0.1 M of
NaOH and rinse abundantly with demineralised water.

Grease/Oil : Clean the electrode bulb with detergent
and water. Rinse the extremity of the electrode with
demineralised water.

Reference electrode junction clogged : Heat a KCl
solution diluted to 60-80oC. Place the clogged part in
the hot solution during 10 minutes. Cool the el ectrode
in a cold KCL solution.

If these advice do not ensure a normal response time,
change the electrode.

Maintenance

No particular maintenance required. Clean the
instrument with a soft tissue and without any

aggressive agent.

Error messages

Note :
In manual acquittal, to suppress an error message

press ENTER after correcting the default.

Transmitter 9135 – pH/redox measurement

Page 61

ERROR MESSAGE

DESCRIPTION/POSSIBLE CAUSE

• Sensor not correctly connected.
Temperature sensor damaged
Replace it if necessary.

• Sensor not correctly connected.
Temperature sensor damaged
Replace it if necessary.

• The pH value is inferior to -3 pH.

• The pH value is superior to 14 pH.

• The glass electrode impedance is superior to the

limits set by the user. It is required to :

- change the limits (SERVICE / IMPEDANCES /
GLASS / UPPER) or,

- clean or change the clogged electrode.

10.8

pH

Pt100/Pt1000

SHORT-CIRCUIT

11.4

pH

Pt100/Pt1000

OPEN CIRCUIT

1.4

pH

MEASURE

TOO LOW

13.4

pH

MEASURE

TOO HIGH

10.3

pH

GLASS IMPED.

TOO HIGH

Transmitter 9135 - pH/redox measurement

Page 62

The glass electrode impedance is inferior to the limits
set by the user. It is required to :

- change the limits (SERVICE / IMPEDANCES /
GLASS / LOWER) or,

- change the broken electrode.

The reference electrode impedance is inferior to the
limits set by the user. It is required to :

- change the limits (SERVICE / IMPEDANCES /
REFERENCE / LOWER) or,

- change the damaged electrode.

The reference electrode impedance is superior to the
limits set by the user. It is required to :

- change the limits (SERVICE / IMPEDANCES /
REFERENCE / UPPER) or,

- clean the clogged electrode or change the poisoned
electrode.

The time out of the neutral zone is superior to the limit
programmed by the user. It is required to :

- change the limits

- check the relays S1 and S2.

7.9

pH

GLASS IMPED.

TOO LOW

10.1

pH

REF. IMPED.

TOO LOW

6.4

pH

REF. IMPED.

TOO HIGH

5.8

pH

REGULATION

TOO LONG

Transmitter 9135 – pH/redox measurement

Page 63

ERROR MESSAGES DURING A CALIBRATION

NOTE : Press ESC to leave the menu and calibrate again.

OFFSET

OUT OF LIMITS

SLOPE : 99,9%

ZERO : 4.00 pH

PH CALIB.

The zero shift is superior to the limit
programmed.

Limits :

- pH calibration : ± 3 pH

- redox calibration : ± 250 mV

SLOPE

OUT OF LIMITS

SLOPE : 130%

ZERO : 0.1 pH

PH CALIB.

The slope shift is superior to the limit
programmed.

Limits : 70...120 %

)

T

OUT OF LIMITS

PH CALIB.

) T : +25.0°C

) T

OUT OF LIMITS

PH CALIB.

) T : +25.0°C

The temperature drift is superior to the limit
programmed.

Limits : -50°C/+20°C

ERROR MESSAGES DURING AN IMPEDANCE MEASUREMENT TEST.

NOTE : Press ESC to leave the menu.

GLASS

TEST

TOO LOW

REFERENCE

TOO LOW

The impedance measurement is inferior to
5 M Ω for the glass electrode and 100 Ω for
the reference electrode.

GLASS

TEST

TOO HIGH

REFERENCE

TOO HIGH

The impedance measurement is superior to
1 GΩ for the glass electrode.

∆

∆

Transmiter 9135 – pH/redox measurement

Page 65

7. Impedance me asurement

Electrode impedance : electrode integrity index

A method generally used to detect an electrode default
is to calibrate a pH measurement system in pH
standards solutions. If the slope or the zero
(asymmetry) characteristics are out of the programmed

limits., one of the electrodes is considered to be
damaged.

An other method consists of the manual measurement
of both electrode impedance. This method is easy to
use with the reference electrode, but intricate with the
glass electrode which has a high impedance.

Besides, for both methods the electrodes need to be
withdrawn from the process.

Electrode defaults usually met are as follows :

• A crack of the glass membrane which shows a low
impedance between the sample and the

electrode.

• A contaminated electrode (deposit) which shows a
weaker measurement sensibility and an electrode

high impedance.

• A lack of electrolyte in the reference electrode
which shows a very important impedance.

a poisoned reference electrode by sulphides which
precipitate with silver ions and may clogged the

electrolytic junction. This poisoning shows a high
increase of the impedance.

Transmitter 9135 - pH/redox measurement

Page 66

In our system, the electrode impedance measurement
results from the measurement system without addition
of commutation circuits.

Measurement principle

A non-oxidising electrode permits to set the liquid
potential to the zero measured. A very stable voltage
(equal to E) is applied to the electrode. Two capacities
are loaded through the electrode impedance. After a
certain time (which depends on the impedance
measured), the system measures the potential
variation on each electrode.

The process temperature is measured to compensate
the impedance measurement of the glass electrode.

The impedance measurement drift of the glass
electrode according to the temperature is represented
by the curve below :

0

200

400

600

800

1000

0 5 10 15 20 25 30 35 40 45 50

Temperature (°C)

impedance (T°C) impedance (25°C)

Impedance measurement 8404_b

( Mohms )

Transmiter 9135 – pH/redox measurement

Page 67

Note :
Note that the impedance measured represents the

sums of the resistances of the "liquid earth"
electrode, reference electrode, glass electrode
according to the case.

In pH measurement in ultra pure water, the very high
resistivity of the sample, does not allow to determine
precisely the reference electrode impedance. In fact,
the liquid impedance is 100 KΩ and represents about

10 times the electrode impedance.

Transmiter 9135 – pH/redox measurement

Page 69

8. Analogue outputs and temperature control

Analogue outputs control

An external socket from the transmitter (for certain
versions) fixed on the lower part of the front panel
allows to measure the value of the analogue output
current by inserting a miliampere- meter in the current

loop

Figure 1 : Special control cable for analogue outputs

A special cable (figure 1, Ref : 09125=A=8010),
provided as an option , gives access, when connected,
to the following signals :

I1+: brown flex
I1- : yellow flex
I2+ : white flex
I2- : green flex
Reading in mA between the yellow and brown wires

gives the current value of output 1.
Reading in mA between the white and green wires

gives the current value of output 2.

Transmitter 9135 - pH/redox measurement

Page 70

Pt100 simulator connections

The transmitter can be connected to a Pt100 simulator
by means of the cable (Ref : 09125=A=8010) :

Temp + : white flex
Temp - : yellow flex

PH simulator connections

pH simulator can be connected to the electrode
connection cable by means of another cable

(Ref : 09135=A=8030).

Simulation measure
red plug

Shield cable L = 30 cm Simulation reference

black plug

SK9 screw for connection
on pH-probe cable

Glass electrode imput : red plug
Reference imput : black plug

Transmiter 9135 – pH/redox measurement

Page A1

Appendix A : Default values

CALIBRATION

PH CALIB.

TYPE : Auto

PARAMETERS

DATE : 01/01/01
SLOPE : 100.0%
OFFSET : 0.00 pH

∆T : 0.0°C

PROGRAMMING

MEASURE

ELECTRODE
TYPE : Glass

TEMP. COMP.

MEASURE : No
TEMP. : 25°C
COMP. : Nernst

ALARMS

ALARMS S1...S4

AFFECT. : pH
LIMIT : 0.00 pH
DIR. : Down
DELAY : 000 s
HYST. : 00%

RELAY : NO

mA OUTPUTS

OUTPUT 1

AFFECT. : pH
TYPE : 0-20
LOWER : 00.00 pH
UPPER : 14.00 pH

OUTPUT 2

AFFECT. : pH
TYPE : 0-20
LOWER : 00.00 pH
UPPER : 14.00 pH

SPECIAL PROG.

MAINTENANCE

MODE : Preset

TIMER

MODE : Last

CALIBRATION

MODE : Last

SYST. ALARM

MODE : Last

Transmitter 9135 - pH/redox measurement

Page A2

RS485

No : 1
BAUD : 19200
PARITY : No
STOP BIT : 1

WORD invs. : YES
NO

SERVICE

IMPEDANCES

FREQUENCE : 24.0 H
GLASS

GLASS : No

REFERENCE

REFERENCE : No

AVERAGE

AVERAGE : 0

DISPLAY

DISPLAY

RES. : 0.01 pH
UNIT : °C

LANGUAGE GB

CODE

CODE

CALIB. : 0000
PROG. : 0000

SERVICE : 0000

Transmiter 9135 – pH/redox measurement

Page B1

Appendix B : Spare parts list

Any other spare parts except those below in the table should be replaced in
the instrument.

Part number

Description

09125=A=1001

9135 equipped CPU board

09135=A=1500

9135 complete pH module

09125=A=2000

9135 power supply (standard version)

09125=A=2020

9135 power supply (low voltage version)

09125=A=4000

Relay board (option)

09125=A=1101

RS485 board (option)

09125=A=2485

RS485 kit (JBUS/MODBUS manual + board)

09125=C=3000

Mounted transmitter housing

425=110=002

Shutter PG 11 for P.E

425=110=221

Cable gland PG11

425=130=002

Shutter PG 13,5 for P.E

425=135=222

Cable gland PG13,5

351=007=001

Strap FLEXPAC 7 PTS

621=083=062

French instruction manual

621=991=000

JBUS/MODBUS communication manual

08362=A=2000

pH electrode

359016,10110

pH electrode’s 3 m cable

359016,10120

pH electrode’s 10 m cable

359016,10122

pH electrode’s 20 m cable

09125=A=8010

Pt100/1000’s simulator connections cable

09135=A=8030

Low impedance pH’s simulator connections cable

Transmitter 9135 - pH/redox measurement

Page B2

08362=A=1001

Pt100’s temperature sensor

08362=A=3001

Pt100’s 3 m cable

08362=A=3002

Pt100’s 10 m cable

08362=A=3003

Pt100’s 20 m cable

08362=A=4000

2 connections (1/8" NPT, 6x8)

363130, 00500

pH 4 solution (500 ml)

363131, 00500

pH 6,88 solution (500 ml)

363132, 00500

pH 9,22 solution (500 ml)