Xylem Multi 3620 IDS User manual

OPERATING MANUAL
ba77169d06 10/2021
Multi 3620 IDS
DIGITAL METER FOR IDS SENSORS
3620 IDS

Multi 3620 IDS
2ba77169d06 10/2021
Copyright © 2021 Xylem Analytics Germany GmbH
Printed in Germany.

Multi 3620 IDS - Contents
Multi 3620 IDS Contents
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1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 MeterMulti 3620 IDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.1 IDS sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.2 Wireless operation of IDS sensors . . . . . . . . . . . . . . . . . . 8
1.2.3 IDS adapter for analog sensors . . . . . . . . . . . . . . . . . . . . . 8
1.2.4 Automatic sensor recognition . . . . . . . . . . . . . . . . . . . . . . 9
1.3 OxiTop®-IDS measuring heads. . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.1 Safety information in the operating manual . . . . . . . . . . . 10
2.1.2 Safety signs on the meter . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.3 Further documents providing safety information . . . . . . . 10
2.2 Safe operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.1 Authorized use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.2 Requirements for safe operation . . . . . . . . . . . . . . . . . . . 11
2.2.3 Unauthorized use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Initial commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.1 Inserting the rechargeable batteries . . . . . . . . . . . . . . . . 13
3.3.2 Connecting the power pack / charging the batteries . . . . 13
3.3.3 Switch on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3.4 Setting the date and time. . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 General operating principles . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1.1 Keypad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1.3 Status information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1.4 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1.5 Channel display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1.6 Sensor info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.7 Display of several sensors in the measuring mode . . 20
4.2 Switching on the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Switching off the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Login with user name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.5 Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Contents Multi 3620 IDS
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4.5.1 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5.2 Measured value display . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5.3 Menus and dialogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.5.4 Navigation example 1: Setting the language . . . . . . . . . 25
4.5.5 Example 2 on navigation: Setting the date and time . . . 27
5 pH value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.1 Measuring the pH value . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . 30
5.2 pH calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2.2 When do you have to calibrate? . . . . . . . . . . . . . . . . . . . 31
5.2.3 Automatic calibration (AutoCal) . . . . . . . . . . . . . . . . . . . 31
5.2.4 Manual calibration (ConCal) . . . . . . . . . . . . . . . . . . . . . . 34
5.2.5 Calibration points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.2.6 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.3 Continuous measurement control (CMC function) . . . . . . . 40
5.4 QSC function (sensor quality control) . . . . . . . . . . . . . . . . . 41
6 ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.1 Measuring the ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . 46
6.2 ORP calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7 Dissolved oxygen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.1.1 Measuring D.O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . 50
7.2 FDO® check procedure (check of the FDO®925) . . . . . . . . . . 50
7.2.1 Why should you check the sensor? . . . . . . . . . . . . . . . . 50
7.2.2 When should you check the sensor? . . . . . . . . . . . . . . . 50
7.2.3 Carrying out the FDO® check procedure . . . . . . . . . . . . 50
7.2.4 Evaluation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.3.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.3.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.3.3 Calibration procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.3.4 Calibration in water vapor-saturated air . . . . . . . . . . . . . 52
7.3.5 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8.1.1 Measuring the conductivity . . . . . . . . . . . . . . . . . . . . . . . 56
8.1.2 Measuring the temperature . . . . . . . . . . . . . . . . . . . . . . 58
8.2 Temperature compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.3.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.3.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.3.3 Determining the cell constant (calibration in control

Multi 3620 IDS Contents
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standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.3.4 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9 Turbidity measurement (VisoTurb®900-P) . . . . . . . . . . . . . 63
9.1 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.1.1 Measuring the turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.2.1 Why calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.2.2 When to calibrate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
9.2.3 Calibration standards . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.2.4 Carry out calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
9.2.5 Calibration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
10 BOD measurement (OxiTop®-IDS measuring heads) . . . . . 70
11 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
11.1 pH measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
11.1.1 Settings for pH measurements . . . . . . . . . . . . . . . . . . . . 71
11.1.2 Buffer sets for calibration . . . . . . . . . . . . . . . . . . . . . . . . 72
11.1.3 Calibration interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
11.2 ORP measurement settings. . . . . . . . . . . . . . . . . . . . . . . . . . . 75
11.2.1 Settings for ORP measurements . . . . . . . . . . . . . . . . . . 75
11.3 D.O. measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
11.3.1 Settings for D.O. sensors . . . . . . . . . . . . . . . . . . . . . . . . 75
11.4 Cond measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . 77
11.4.1 Settings for IDS conductivity sensors . . . . . . . . . . . . . . . 77
11.5 Turb measurement settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
11.5.1 Settings for turbidity sensors . . . . . . . . . . . . . . . . . . . . . 79
11.6 Sensor-independent settings . . . . . . . . . . . . . . . . . . . . . . . . . . 80
11.6.1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
11.6.2 Data storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
11.6.3 Automatic Stability control . . . . . . . . . . . . . . . . . . . . . . . 82
11.6.4 Automatic switch-off function . . . . . . . . . . . . . . . . . . . . . 82
11.6.5 Display illumination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
11.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
11.7.1 Resetting the measurement settings . . . . . . . . . . . . . . . 83
11.7.2 Resetting the system settings. . . . . . . . . . . . . . . . . . . . . 85
12 Data memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
12.1 Manual storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
12.2 Automatic data storage at intervals . . . . . . . . . . . . . . . . . . 86
12.3 Measurement data memory. . . . . . . . . . . . . . . . . . . . . . . . . . . 89
12.3.1 Editing the measurement data memory . . . . . . . . . . . . . 89
12.3.2 Erasing the measurement data memory . . . . . . . . . . . . 90
12.3.3 Measurement dataset. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
13 Transmitting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
13.1 Saving data to a USB memory device . . . . . . . . . . . . . . . . . . . 92
13.2 Transmitting data to a USB printer . . . . . . . . . . . . . . . . . . . . . 92
13.3 Transmitting data to a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
13.4 MultiLab Importer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Contents Multi 3620 IDS
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14 Maintenance, cleaning, disposal. . . . . . . . . . . . . . . . . . . . . . 97
14.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
14.1.1 General maintenance activities . . . . . . . . . . . . . . . . . . . 97
14.1.2 Replacing the rechargeable batteries. . . . . . . . . . . . . . . 97
14.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
14.3 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
14.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
15 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
15.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
15.2 pH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
15.3 Dissolved oxygen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
15.4 Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
15.5 Turbidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
16 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
16.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
16.2 Measuring ranges, resolution, accuracy . . . . . . . . . . . . . . . . 105
17 Appendix: Firmware update . . . . . . . . . . . . . . . . . . . . . . . . 106
17.1 Firmware update for the meter . . . . . . . . . . . . . . . . . . . . . . . 106
17.2 Firmware-Update for IDS sensors and IDS adapters . . . . . . 107
18 Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
19 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Multi 3620 IDS Overview
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1 Overview
1.1 MeterMulti 3620 IDS
The compact, digital precision meter Multi 3620 IDS enables you to carry out
pH measurements, ORP measurements, conductivity measurements, dis-
solved oxygen (D.O.) measurements and turbidity measurements quickly and
reliably.
The Multi 3620 IDS provides the maximum degree of operating comfort, reli-
ability and measuring certainty for all applications.
The Multi 3620 IDS supports you in your work with the following functions:
proven calibration procedures
automatic stability control (AR)
automatic sensor recognition
CMC (continuous measurement control)
QSC (sensor quality control).
1 Keypad
2 Display
3 Connectors
3620 IDS
1
2
3

Overview Multi 3620 IDS
8ba77169d06 10/2021
1.2 Sensors
1.2.1 IDS sensors
IDS sensors
support the automatic sensor recognition
show only the settings relevant to the specific sensor in the setting menu
process signals in the sensor digitally so that precise and interference-free
measurements are enabled even with long cables
facilitate to assign a sensor to a measured parameter with differently colored
couplings
have quick-lock couplings with which to fix the sensors to the meter.
Sensor data from
IDS sensors
IDS sensors transmit the following sensor data to the meter:
SENSOR ID
– Sensor name
– Sensor series number
Calibration data
Measurement settings
The calibration data are updated in the IDS sensor after each calibration pro-
cedure. A message is displayed while the data are being updated in the sensor.
1.2.2 Wireless operation of IDS sensors
With the aid of the adapters in the IDS WLM System, IDS sensors with plug
head connectors (variant P) or OxiTop®-IDS measuring heads can be wire-
lessly connected to your Multi 3620 IDS.
1.2.3 IDS adapter for analog sensors
Information on available IDS sensors is available on the Internet.
In the measured value display, you can display the sensor name
and series number of the selected sensor with the [Info] softkey.
You can then display further sensor data stored in the sensor with
the [More] softkey (see section 4.1.6 SENSOR INFO).
Further information on the wireless operation of IDS sensors:
Web resources
Operating manual of the IDS WLM System.

Multi 3620 IDS Overview
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With the aid of an IDS adapter, you can also operate analog sensors on the
Multi 3620 IDS. The combination of the IDS adapter and analog sensor
behaves like an IDS sensor.
1.2.4 Automatic sensor recognition
The automatic sensor recognition for IDS sensors allows
to operate an IDS sensor with different meters without recalibrating
to operate different IDS sensors at one meter without recalibration
to assign measurement data to an IDS sensor
– Measurement datasets are always stored and output with the sensor
name and sensor series number.
to assign calibration data to an IDS sensor
– Calibration data and calibration history are always stored and output with
the sensor name and sensor series number.
to activate the correct cell constant for conductivity sensors automatically
to hide menus automatically that do not concern this sensor
To be able to use the automatic sensor recognition, a meter that supports the
automatic sensor recognition (e.g. Multi 3620 IDS) and a digital IDS sensor are
required.
In digital IDS sensors, sensor data are stored that clearly identify the sensor.
The sensor data are automatically taken over by the meter.
1.3 OxiTop®-IDS measuring heads
Meters of the series MultiLine Multi 3620 IDS can be wirelessly connected to
the OxiTop®-IDS measuring heads for BOD- and pressure measurements.
Information on available IDS adapters is given on the Internet.
Detailed information on the IDS adapter is given in the operating
manual of the adapter.
More information on how to operate the OxiTop®-IDS measuring
heads:
Web resources
Operating manual of the OxiTop®-IDS measuring heads
Complementary operating manual
OxiTop®-IDS (/B) Multi 3620 IDS
wireless operation of OxiTop®-IDS (/B) measuring heads

Safety Multi 3620 IDS
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2 Safety
2.1 Safety information
2.1.1 Safety information in the operating manual
This operating manual provides important information on the safe operation of
the meter. Read this operating manual thoroughly and make yourself familiar
with the meter before putting it into operation or working with it. The operating
manual must be kept in the vicinity of the meter so you can always find the infor-
mation you need.
Important safety instructions are highlighted in this operating manual. They are
indicated by the warning symbol (triangle) in the left column. The signal word
(e.g. "CAUTION") indicates the level of danger:
NOTE
indicates a possibly dangerous situation where goods might be damaged
if the actions mentioned are not taken.
2.1.2 Safety signs on the meter
Note all labels, information signs and safety symbols on the meter and in the
battery compartment. A warning symbol (triangle) without text refers to safety
information in this operating manual.
2.1.3 Further documents providing safety information
The following documents provide additional information, which you should
observe for your safety when working with the measuring system:
• Operating manuals of sensors and other accessories
• Safety datasheets of calibration or maintenance accessories (such as buffer
solutions, electrolyte solutions, etc.)
WARNING
indicates a possibly dangerous situation that can lead to seri-
ous (irreversible) injury or death if the safety instruction is not
followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not fol-
lowed.

Multi 3620 IDS Safety
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2.2 Safe operation
2.2.1 Authorized use
The authorized use of the meter consists exclusively of the measurement of the
pH, ORP, conductivity and dissolved oxygen in a laboratory environment.
Only the operation and running of the meter according to the instructions and
technical specifications given in this operating manual is authorized (see sec-
tion 16 TECHNICAL DATA, page 104).
Any other use is considered unauthorized.
2.2.2 Requirements for safe operation
Note the following points for safe operation:
• The meter may only be operated according to the authorized use specified
above.
• The meter may only be supplied with power by the energy sources
mentioned in this operating manual.
• The meter may only be operated under the environmental conditions
mentioned in this operating manual.
• The meter may only be opened if this is explicitly described in this operating
manual (example: Inserting the batteries).
2.2.3 Unauthorized use
The meter must not be put into operation if:
• it is visibly damaged (e.g. after being transported)
• it was stored under adverse conditions for a lengthy period of time (storing
conditions, see section 16 TECHNICAL DATA, page 104).

Commissioning Multi 3620 IDS
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3 Commissioning
3.1 Scope of delivery
MeterMulti 3620 IDS
4 NiMH rechargeable batteries 1.2 V Mignon type AA
USB cable (A plug on mini B plug)
Power pack
Short instructions
Detailed operating manual (4 languages)
CD-ROM with
– USB drivers
– detailed operating manual
– software MultiLab Importer
3.2 Power supply
The Multi 3620 IDS is supplied with power in the following ways:
Battery operation with NiMh rechargeable batteries
Mains operation with the supplied power pack.
The NiMh batteries are automatically charged while the power pack is con-
nected.
USB operation via a connected USB-B cable.
The NiMh batteries are not charged
3.3 Initial commissioning
Perform the following activities:
Insert the batteries and charge them
Connect the power pack (mains operation / battery charging)
Switch on the meter
Set the date and time

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3.3.1 Inserting the rechargeable batteries
3.3.2 Connecting the power pack / charging the batteries
1Screws
2 Battery compartment
1 Unscrew the two screws (1) on the underside of the meter.
2 Open the battery compartment (2) on the underside of the
meter.
CAUTION
Make sure that the poles of the rechargeable batteries are po-
sitioned correctly.
The ±signs on the batteries must correspond to the ± signs in
the battery compartment.
3 Place four rechargeable batteries (type Mignon AA) in the battery
compartment.
4 Close the battery compartment (2) and tighten the screws (1).
CAUTION
Use original power packs only (see section 16.1).
The line voltage at the operating site must lie within the input
voltage range of the original power pack (see section 16.1).
2
1

Commissioning Multi 3620 IDS
14 ba77169d06 10/2021
Operating condition
of the batteries
3.3.3 Switch on the meter
CAUTION
The batteries in the battery compartment are automatically
charged when the power pack is connected.
Make sure that only NiMH rechargeable batteries are in the
battery compartment. The charging process is optimized for
NiMH batteries. Other battery types can cause damage during
the charging process.
Make sure that the ambient temperature is not more than 40 °C
(104 °F) when the power pack is connected.
1 Connect the plug of the power pack to the socket for the power pack
on the Multi 3620 IDS.
2 Connect the original power pack to an easily accessible power outlet.
3 Charge the batteries completely prior to putting the meter into opera-
tion for the first time.
The charging process takes approx. 24 hours.
Symbol Explanation
Mains operation with charge function
Batteries are automatically charged in the background.
Battery operation
Batteries fully charged
Battery operation
Batteries almost empty
1 Press the <On/Off> key.
The meter performs a self-test.
The display shows the manufacturer's logo while the self-test is being
performed.
2 Connect the sensor.
The meter switches to the measuring mode (measured value display).
The meter has an energy saving feature to avoid unnecessary
power consumption during battery operation.
The energy saving feature switches off the meter during battery
operation if no key is pressed during the adjusted interval. (How to
set the switch-off interval, see section 11.6).
The switch-off interval of the energy saving feature is not active
when the meter is supplied with power via the power pack or the
USB-B cable.

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3.3.4 Setting the date and time
1 See section 4.5.5

Operation Multi 3620 IDS
16 ba77169d06 10/2021
4Operation
4.1 General operating principles
4.1.1 Keypad
In this operating manual, keys are indicated by brackets <..> .
The key symbol (e.g. <MENU/ENTER>) generally indicates a short keystroke
(under 2 sec) in this operating manual. A long keystroke (approx. 2 sec) is indi-
cated by the underscore behind the key symbol (e.g. <MENU/ENTER_>).
<F1>:
<F2>:
Softkeys providing situation dependent functions, e.g.:
<F1>/[Info]: View information on a sensor
<On/Off>:
<On/Off_>:
Switches the meter on or off
<M>:
<M_>:
Selects the measured parameter
Switch between operating with IDS sensors and operating with OxiTop®-IDS
(/B) measuring heads
<CAL>:
<CAL_>:
Calls up the calibration procedure
Displays the calibration data
<AR> Freezes the measured value (HOLD function)
Switches the AutoRead measurement on or off
<STO>:
<STO_>:
Saves a measured value manually
Opens the menu for the automatic save function
<RCL>:
<RCL_>:
Displays the manually stored measured values
Displays the automatically stored measured values
<><>:
<><>:
Menu control, navigation
<MENU/ENTER>:
<MENU/ENTER_>:
Opens the menu for measurement settings / Confirms entries
Opens the menu for system settings
<PRT>
<PRT_>
Outputs stored data to the interface
Outputs displayed data to the interface at intervals
<ESC>: Cancels an action

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4.1.2 Display
Example (pH):
4.1.3 Status information
1 Status information (meter)
2 Status information (sensor)
3 Measured value
4 Measured parameter
5 Continuous measurement control (CMC function)
6 Channel display: Plug position of the sensor
7 Sensor symbol (calibration evaluation, calibration interval)
8 Measured temperature (with unit)
9 Softkeys and date + time
AutoCal
e.g. TEC
Calibration with automatic buffer recognition, e.g. with the
buffer set: Technical buffers
ConCal Calibration with any buffers
Error An error occurred during calibration
AR Stability control (AutoRead) is active
HOLD Measured value is frozen (<AR> key)
Battery operation, batteries fully charged
Battery operation, batteries almost empty
Mains operation with charge function
Batteries are automatically charged in the background.
Data are automatically output to the USB-B interface (USB
Device) at intervals
Data are output to the USB-A interface (USBHost) to a USB
flash drive
5
4
3
7
8
9
1
6
2
HOLD AR
AutoCal TEC
22.09.2009 08:00
Info

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18 ba77169d06 10/2021
4.1.4 Connectors
4.1.5 Channel display
The Multi 3620 IDS administers the sensors connected and displays which
sensor is plugged to which connection.
Data are output to the USB-A interface (USBHost) to a USB
printer
If there is at the same time a USB-B connection (USB
Device), e.g. to a PC, the data are output to the USB-B inter-
face only (USB Device).
Power supply via the USB-B interface (USB Device)
Batteries are not being charged
1 IDS sensors: (pH, ORP, conductivity, D.O.)
2 Power pack
3 USB-A (USB Host) interface
4 USB-B (USB Device) interface
5 Service interface
CAUTION
Only connect sensors to the meter that cannot return any volt-
ages or currents that are not allowed (> SELV and > current
circuit with current limiting).
WTW IDS sensors and IDS adapters meet these requirements.
51234

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ba77169d06 10/2021 19
4.1.6 Sensor info
You can display the current sensor data and sensor settings of a connected
sensor at any time. The sensor data are available in the measured value
display with the [Info] softkey.
1 Channel display:
Display of the plug position for the relevant parameter
The red bar indicates for each connected sensor to which plug posi-
tion (channel) of the meter it is connected.
1. In the measured value display:
Display the sensor data (sensor name, series number) with [Info].
1
Info
30.09.2012 08:00Info
30.09.2012 08:00
More
SenTix 940
B092500013

Operation Multi 3620 IDS
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4.1.7 Display of several sensors in the measuring mode
The measured values of the connected sensors can be displayed in the follow-
ing ways:
Clear display of all connected sensors
Detailed display of one sensor
(e.g. incl. CMC feature with pH sensors)
With the softkey you can very easily switch between the two display types. The
suitable softkey is displayed depending on the operating situation.
4.2 Switching on the meter
2. Display further sensor data (settings) with [More].
30.09.2012 08:00
Man. temperature: 25 °C
pH resolution 0.001
mV resolution 0.1
Buffer TEC
Calibration interval 7d
Unit for slope mV/pH
QSC:
Software version 1.0
SenTix 940
B092500013
15.03.2014 08:00
Info
30.09.2012 08:00
Info
1. Switch the meter on with <On/Off>.
The meter performs a self-test.
2. Connect the sensor.
The meter is ready to measure.