Swann AMU-II ph/Redox User manual

AMU-II pH/Redox
A-96.150.441 / 230523
AMU-II pH/Redox
Operator’s Manual

© 2023, Swan Analytische Instrumente AG, Switzerland, all rights reserved.
This manual applies to firmware V1.02 and higher.
The information contained in this document is subject to change without notice.
Customer Support
Swan and its representatives maintain a fully trained staff of technical specialists around
the world. For any technical question, contact your nearest Swan representative, or the
manufacturer:
Swan Analytische Instrumente AG
Studbachstrasse 13
8340 Hinwil
Switzerland
Internet: www.swan.ch
E-mail: [email protected]
Document Status
Title: AMU-II pH/Redox Operator’s Manual
ID: A-96.150.441
Revision Issue
00 May 2023 First edition

A-96.150.441 / 230523
AMU-II pH/Redox
1
Table of Contents
1. Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Warning Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. General Safety Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1. Description of the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2. Single Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 AMU-II pH/Redox Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 Flow Cell M-Flow 10-3PG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.3 Flow Cell QV-Flow SS316L pHRT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.4 Flow Cell B-Flow IS1000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2.5 Swansensor pH and Redox Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.6 Swansensor pH and Redox AY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2.7 Swansensor pH and Redox SI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2.8 Swansensor pH and Redox FL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.9 Swansensor Reference FL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.10 Spray Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1. Mounting of the AMU-II Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2. Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.3. Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.4. Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5. Swan Flow Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6. Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.7. Relay Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.7.1 Alarm Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.7.2 Relay 1 and 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.8. Signal Output 1 and 2 (Current Outputs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.9. Interface Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.9.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.9.2 USB Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.9.3 RS485 Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.9.4 HART Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.10. RS232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4. Instrument Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.1. Establish Sample Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2. Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

A-96.150.441 / 230523
AMU-II pH/Redox
2
5. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.1. Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2. Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.3. Software Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.4. Changing Parameters and values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1. Stop of Operation for Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2. Process Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3. Standard Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.4. Quality Assurance of the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.4.1 Activate SWAN Quality assurance procedure . . . . . . . . . . . . . . . . . . . . . . . . 41
6.4.2 Pre-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.3 Connect instruments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.4 Carry out comparison measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.4.5 Completion of the measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.5. Longer Stop of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7. Error List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8. Program Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.1. Messages (Main Menu 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
8.2. Diagnostics (Main Menu 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
8.3. Maintenance (Main Menu 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.4. Operation (Main Menu 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.5. Installation (Main Menu 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
9. Program List and Explanations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
1 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10. Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11. Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

A-96.150.441 / 230523
AMU-II pH/Redox
Safety Instructions
3
Operator’s Manual
This document describes the main steps for instrument setup,
operation and maintenance.
1. Safety Instructions
General The instructions included in this section explain the potential risks
associated with instrument operation and provide important safety
practices designed to minimize these risks.
If you carefully follow the information contained in this section, you
can protect yourself from hazards and create a safer work environ-
ment.
More safety instructions are given throughout this manual, at the
respective locations where observation is most important. Strictly
follow all safety instructions in this publication.
Target
audience
Operator: Qualified person who uses the equipment for its intended
purpose.
Instrument operation requires thorough knowledge of applications,
instrument functions and software program as well as all applicable
safety rules and regulations.
OM location Keep the Operator’s Manual in proximity of the instrument.
Qualification,
training
To be qualified for instrument installation and operation, you must:
read and understand the instructions in this manual as well as
the Material Safety Data Sheets.
know the relevant safety rules and regulations.

A-96.150.441 / 230523
AMU-II pH/Redox
Safety Instructions
4
1.1. Warning Notices
The symbols used for safety-related notices have the following
meaning:
DANGER
Your life or physical wellbeing are in serious danger if such warn-
ings are ignored.
Follow the prevention instructions carefully.
WARNING
Severe injuries or damage to the equipment can occur if such
warnings are ignored.
Follow the prevention instructions carefully.
CAUTION
Damage to the equipment, minor injury, malfunctions or incorrect
process values can be the consequence if such warnings are ig-
nored.
Follow the prevention instructions carefully.
Mandatory
signs
The mandatory signs in this manual have the following meaning:
Safety goggles
Safety gloves

A-96.150.441 / 230523
AMU-II pH/Redox
Safety Instructions
5
Warning signs The warning signs in this manual have the following meaning:
Electrical shock hazard
Corrosive
Harmful to health
Flammable
Warning general
Attention general

A-96.150.441 / 230523
AMU-II pH/Redox
Safety Instructions
6
1.2. General Safety Regulations
Legal
requirements
The user is responsible for proper system operation. All precautions
must be followed to ensure safe operation of the instrument.
Spare
parts and
disposables
Use only official Swan spare parts and disposables. If other parts are
used during the normal warranty period, the manufacturer’s
warranty is voided.
Modifications Modifications and instrument upgrades shall only be carried out by
an authorized service technician. Swan will not accept responsibility
for any claim resulting from unauthorized modification or alteration.
WARNING
Electrical Shock Hazard
If proper operation is no longer possible, the instrument must be
disconnected from all power lines, and measures must be taken
to prevent inadvertent operation.
To prevent from electrical shock, always make sure that the
ground wire is connected.
Service shall be performed by authorized personnel only.
Whenever electronic service is required, disconnect instrument
power and power of devices connected to.
– relay 1,
– relay 2,
– alarm relay
WARNING
For safe instrument installation and operation you must read and
understand the instructions in this manual.
WARNING
Only SWAN trained and authorized personnel shall perform the
tasks described in this document.

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
7
2. Product Description
2.1. Description of the System
Application pH and ORP are measured in many applications as for example
potable water, high purity water or waste water. Each application re-
quires different fittings, flow cells, and sensors.
pH measuring
principle
(simplified)
The pH measurement is based on a voltage measurement. A voltage
can only be measured between two different potentials, therefore,
the pH measuring chain contains a measuring electrode and a refer-
ence electrode. The reference electrode maintains a constant poten-
tial whereas the potential of the measuring electrode changes with
the pH value. The voltage which results from this potential difference
is measured and displayed on the transmitter as pH value. The mea-
suring chain is designed so that the voltage is zero at pH 7.
ORP measur-
ing principle
(simplified)
The ORP (redox) measurement is based on a voltage measurement.
A voltage can only be measured between two different potentials,
therefore, the ORP (redox) measuring chain contains a measuring
electrode and a reference electrode. The reference electrode main-
tains a constant potential whereas the potential of the measuring
electrode changes with the ORP value. The voltage which results
from this potential difference is measured and displayed on the
transmitter as ORP value in millivolt (mV).
Temperature
compensation
pH: The pH value depends on the sample temperature. To
compensate temperature fluctuations a temperature sensor is
installed in the flow cell.
ORP: Temperature compensation is not necessary.
Potable water, waste water: Compensation according to Nernst.
High purity water (power plant, semiconductor): Nernst or non-linear
solution temperature compensation, or linear compensation with co-
efficient.

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
8
Signal
outputs
Two signal outputs programmable for measured values (freely
scalable, linear, bilinear, log) or as continuous control output (control
parameters programmable).
Current loop: 0/4–20 mA
Maximal burden: 510 Ω
Relays Two potential-free contacts programmable as limit switches for
measured values, controllers or timer with automatic hold function.
Maximum load: 100 mA/50 V
Alarm relays Two potential-free contacts (one normally open and one normally
closed). Summary alarm indication for programmable alarm values
and instrument faults.
Normally open contact: closed during normal operation, open on
error and power loss.
Normally closed contact: open during normal operation, closed on
error and power loss
Maximum load: 100 mA / 50 V
Input One input for potential-free contact to freeze the measuring value or
to interrupt control in automated installations (hold function or remote
off).
Communica-
tion interface
RS232 interface for logger download with HyperTerminal
RS485 interface with fieldbus protocol Modbus or Profibus DP
(optional)
Safety
features
No data loss after power failure. All data is saved in non-volatile
memory. Overvoltage protection of inputs and outputs. Galvanic sep-
aration of measuring inputs from signal outputs.
pH electrode For the AMU-II pH/Redox four types of pH electrodes are available.
The Swansensor pH Standard is a combined gel electrode for
application in drinking water and swimming pools. Gel electrodes
can not be filled again and have a limited life time.
The Swansensor pH SI is a combined electrode with liquid
electrolyte (KCl) for the measurement of pH in power plants.
The Swansensor pH AY is a combined gel electrode for application
in waste water due to additional salt supplies
The Swansensor pH FL for the measurement of pH in high purity
water. This sensor can only be used in combination with
Swansensor Reference FL, A-87.860.100.

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
9
ORP Electrode For the AMU-II pH/Redox four types of redox (ORP) electrodes are
available.
The Swansensor redox (ORP) Standard is a combined gel
electrode for application in drinking water and swimming pools.
Gel electrodes can not be filled again and have a limited life time.
The Swansensor redox (ORP) SI is a combined electrode with
liquid electrolyte (KCl) for the measurement of redox (ORP) value
in power plants.
The Swansensor redox (ORP) AY is a combined gel electrode for
application in waste water due to additional salt supplies.
The Swansensor ORP FL for the measurement of the redox
potential in high purity water. This sensor can only be used in
combination with Swansensor Reference FL, A-87.860.100.
Reference
electrode
Swansensor Reference FL, reference electrode for Swansensor pH
FL or Swansensor Redox FL
Consumables One 200 ml bottle of 3.5 M KCl lasts for 1 month.

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
10
2.2. Single Components
2.2.1 AMU-II pH/Redox Transmitter
General Electronics housing:
Protection degree:
Ambient temperature:
Humidity:
Display:
Dimensions:
Cutout size
Weight:
Noryl® resin
up to IP54 (front)
-10 to +50 °C
10–90% rel., non condensing
backlit LCD, 75 x 45 mm
96 x 96 x 85 mm (DIN 43700)
92 x 92 mm
0.30 kg
Power supply AC variant:
DC variant:
Power consumption:
100–240 VAC (±10%)
50/60 Hz (±5%)
10–36 VDC
max. 3 VA
pH
measurement
Measuring range:
Resolution
Reference temperature:
0.00 to 14.00
0.01
25 °C
ORP
measurement
Measuring range:
Resolution:
-500 to +1500 mV
1 mV
Temperature
measurement
Pt1000 type sensor (DIN class A)
Measuring range:
Resolution:
-30 to +250 °C
0.1 °C
Sample flow
measurment
with digital SWAN sample flow sensor

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
11
2.2.2 Flow Cell M-Flow 10-3PG
Flow cell for potable water applications for the installation of three
sensors, i.e. a pH or redox sensor, a reference sensor and a tem-
perature sensor. Sensor cleaning available as an option.
60
102
23 23
161
10
10
33 38
90
142
9
Connections Sample:
Cleaning water:
Sensor:
G 1/4” thread
G 1/4” thread
Screw connection: PG 13.5 mm
Installation depth:120 mm
Equipped with elbow hose nozzle for 10 mm tube.
Sample For the flow cell without electrodes!
conditions Flow rate:
Temperature:
Inlet pressure:
Outlet pressure:
Particle size:
4 to 15 l/h
up to 50 °C
up to 1 bar @ 25 °C
Pressure free
below 0.5 mm
No strong acids and bases.
No organic solvents.
Dimensions Width:
Front-to-back:
Height:
Mounting:
90 to 142 mm
138 mm
161 mm
3 screws M5

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
12
2.2.3 Flow Cell QV-Flow SS316L pHRT
Made of stainless steel SS316L with built-in Pt1000 temperature
sensor and a Swagelok connection for 1/4" tube. With flow measure-
ment and needle valve.
For the installation of two sensors i.e. a pH or redox sensor and a
reference sensor. Recommended for the use with Swansensor pH/
Redox SI. Other sensors require an adapter set for installation.
169
195
118
101
143
74
127
71
7.5
95
13
9
22.5 29
43
Technical data Sample inlet:
Sample outlet:
Sample temperature:
Sample flow:
Pressure:
Sensor:
Swagelok G 1/4” thread
Serto 90° angle for 8x6 mm tube
(tube 1.5 m included in delivery)
0–50 °C
5–10 l/h
max. 2 bar at 50 °C
Sample outlet pressure free
Screw connection: PG 13,5 mm
Installation depth: 75 mm

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
13
2.2.4 Flow Cell B-Flow IS1000
Stainless steel flow cell for 2 sensors with integrated Pt1000 tem-
perature sensor. Suitable for all sensors with PG13.5 screw head
and a max. shaft length of 120 mm.
88
65
20
23
94
29
55
120 198
29
Technical data Sample inlet and outlet:
Operating temperature flow cell:
Operating temperature sensors:
Operating pressure flow cell:
Operating pressure sensors:
2 x ¼" NPT female thread
up to 130 °C
up to 50 °C
max. 10 bar
max. 5 bar

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
14
2.2.5 Swansensor pH and Redox Standard
Combined electrode with gel electrolyte for application in drinking
water and swimming pools.
pH Sensor Redox Sensor Sensor cable with
plug
31
13
Ø 12
120 ±2
Specifications
pH Sensor
Operative and measuring range:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
1 to 13 pH
0–50 °C
<2 bar
>150 µS/cm
plug PG 13.5
Specifications
ORP Sensor
Operative and measuring range:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
-400 to +1200 mV
0–50 °C
<2 bar
>150 µS/cm
plug PG 13.5

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
15
2.2.6 Swansensor pH and Redox AY
Combined electrode with gel electrolyte for application in waste wa-
ter due to additional salt supplies.
pH Sensor Redox Sensor Sensor cable with
plug
31
13
Ø 12
120 ±2
Specifications
pH-Sensor
Operative and measuring range:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
1 to 13 pH
0–50 °C
<2 bar
>100 µS/cm
plug PG 13.5
Specifications
ORP-Sensor
Operative and measuring range:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
-400 to +1200 mV
0–50 °C
<2 bar
>100 µS/cm
plug PG 13.5

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
16
2.2.7 Swansensor pH and Redox SI
pH/Redox electrode with reference electrode for the measurement
of pH/Redox value in power plants.
pH Sensor Redox Sensor
12 12
75
110
184
Specifications
pH-Sensor
Operative and measuring range:
Operating temperature:
Electrolyte:
Pressure:
min. Conductivity:
Connection:
1 to 12 pH
0–50 °C
KCl, 3.5 M
pressure free
0.055 µS/cm
plug PG 13.5
Specifications
Redox-Sensor
Operative and measuring range:
Operating temperature:
Electrolyte:
Pressure:
min. Conductivity:
Connection:
-500 to +1500 mV
0–50 °C
KCl 3.5 M
pressure free
3 µS/cm
plug PG 13.5

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
17
2.2.8 Swansensor pH and Redox FL
pH/Redox electrode for the measurement of pH value or redox po-
tential in high purity water. Only in combination with Swansensor
Reference FL.
pH Sensor ORP Sensor Sensor cable with plug
31
13
Ø 12
120 ±2
Specifications
pH-Sensor
Operative and measuring range:
Reference electrode:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
1 to 12 pH
Reference FL
0–50 °C
pressure free
min. 0.055 µS/cm
plug PG 13.5
Specifications
Redox-Sensor
Operative and measuring range:
Reference electrode:
Operating temperature:
Pressure:
Conductivity measuring medium:
Connection:
-500 to +1500 mV
Reference FL
0–50 °C
pressure free
min. 0.055 µS/cm
plug PG 13.5

A-96.150.441 / 230523
AMU-II pH/Redox
Product Description
18
2.2.9 Swansensor Reference FL
Reference electrode for Swansensor pH FL or Swansensor Redox
FL.
2.2.10 Spray Nozzle
For automatic cleaning of the sensor tips applicable with flow cell
M-Flow 10-3PG.
12
75
110
184
Specifications Reference system:
Electrolyte:
Operating temperature:
Pressure:
Min. Conductivity:
Connection:
Ag/AgCl
KCl, 3.5 M
0–50 °C
pressure free
min. 0.055 µS/cm
plug PG 13.5