Hach GS1440 User manual

DOC023.97.80656
GS1440, GS2440EX H2S
Sensor
05/2023, Edition 2
User Manual
Manuel d'utilisation
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Table of Contents
English..............................................................................................................................3
Français......................................................................................................................... 25
Español.......................................................................................................................... 48
Português...................................................................................................................... 71
中文................................................................................................................................. 93
日本語........................................................................................................................... 113
한국어........................................................................................................................... 135
.................................................................................................................................. 156
.............................................................................................................................. 177
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Table of Contents
1 Specifications on page 3
2 General information on page 5
3 Attach the cable guard on page 10
4 Installation on page 12
5 Maintenance on page 19
6 Troubleshooting on page 22
7 Parts and accessories on page 23
Section 1 Specifications
Specifications are subject to change without notice.
Table 1 General specifications
Specification Details
Dimensions (L x D) 240 mm (9.4 in.), Ø 48.3 mm (1.9 in.)
Weight 1.36 kg (3.00 lb)
Enclosure Stainless steel EN 1.4404 (316L), IP68
Mounting Free hanging, in pipe or in air flow cell
Pollution degree 2 (sensor), 4 (installation environment)
Protection class III
Overvoltage category I
Environmental conditions Indoor and outdoor use
Power requirements 12 to 28 VDC (4–20 mA loop) supplied by the CAx440EX field transmitter, a
CDx440sc digital sc gateway or a device
Operating temperature 0 to 40 °C (32 to 104 °F)
Storage temperature 0 to 60 °C (32 to 140 °F)
Humidity 0 to 100% relative humidity
Altitude 2000 m (6562 ft) maximum
Depth in water 10 m (32.8 ft) maximum
pH of water pH 9 maximum; H2S fully converted to non-detectable sulfide forms above
pH 9.
Pressure 3 bar (44 psi) maximum
Calibration gas 1000 ppm
Cables Polyurethane, IP68; 5, 10 or 30 m (16.4, 32.8 or 98.4 ft)
Output signals RS-232 and 4–20 mA
4–20 mA range 0–5 mg/L or 0–1000 ppm (user configurable)
Certifications—GS1440 and
GS2440EX
CE, UKCA, FCC, ISED, RCM, KC
ATEX—GS2440EX Certificate: ETL22ATEX0113X
II 1 G Ex ia IIC T4 Ga
Power/4-20 mA: Ui: 30 V, Ii: 100 mA, Ci: 22 nF Li: 100 µH Pi: 0.70 W
RS-232: Ui: 20 V, Ii: 100mA, Ci: 0 nF Li: 0 µH, Pi: 0.30 W
Tamb: -20 to +60 °C
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Table 1 General specifications (continued)
Specification Details
UKEX—GS2440EX Certificate: ITS22UKEX0506X
II 1 G Ex ia IIC T4 Ga
-20 °C ≤ Ta ≤ +60 °C
IECEx—GS2440EX Certificate: IECEx ETL 22.0003X
Ex ia IIC T4 Ga
Tamb: -20 to +60 °C
North America—GS2440EX Certificate: ETL21CA104799609X
Class I Zone 0 AEx ia IIC T4 Ga
Class I Division 1 Groups A–D T4
Ex ia IIC T4 Ga
Tamb: -20 to +60 °C
Warranty 1 year
Table 2 Performance specifications
Specification Details
Measurement range in water 0 to 5 mg/L H2S
Measurement range in air 0 to 1000 ppm H2S
Accuracy ± 5% full scale (discrete measurement accuracy, 90-second purge of
1000 ± 20 ppm H2S standard after one-point calibration)
Response time (t90) < 30 seconds
Detection limit 1% full scale
Table 3 Interferences
Gas Interference
level
in gas (%) 1
Interference
level
in liquid (%) 2
Gas Interference
level
in gas (%)1
Interference
level
in liquid
(%)2
Methane (CH4) 0 0 Hydrogen (H2) 0.8 96
Carbon dioxide (CO2) 0 0 Carbon monoxide (CO) 0.6 77
Nitrogen (N2) 0 0 Dimethyl sulfide
((CH3)2S))
18 18
Oxygen (O2) 0 0 Methyl mercaptan
(CH3SH)
174 44
Air (O2, N2, Ar) 0 0 Ethyl mercaptan
(C2H6S)
13 14
Nitrous oxide (N2O) 0 0 Sulfur dioxide (SO2) 40 1
Ammonia (NH3) 0 0
1Given as a signal for the interfering species in % of H2S signal at equal partial pressures.
2Given as a signal for the interfering species in % of H2S signal at equal molar concentrations.
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Section 2 General information
In no event will the manufacturer be liable for damages resulting from any improper use of product or
failure to comply with the instructions in the manual. The manufacturer reserves the right to make
changes in this manual and the products it describes at any time, without notice or obligation.
Revised editions are found on the manufacturer’s website.
2.1 Safety information
The manufacturer is not responsible for any damages due to misapplication or misuse of this product
including, without limitation, direct, incidental and consequential damages, and disclaims such
damages to the full extent permitted under applicable law. The user is solely responsible to identify
critical application risks and install appropriate mechanisms to protect processes during a possible
equipment malfunction.
Please read this entire manual before unpacking, setting up or operating this equipment. Pay
attention to all danger and caution statements. Failure to do so could result in serious injury to the
operator or damage to the equipment.
Make sure that the protection provided by this equipment is not impaired. Do not use or install this
equipment in any manner other than that specified in this manual.
2.1.1 Use of hazard information
D A N G E R
Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special
emphasis.
2.1.2 Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the instrument
could occur if not observed. A symbol on the instrument is referenced in the manual with a
precautionary statement.
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 domestic or public
disposal systems. Return old or end-of-life equipment to the manufacturer for disposal at no charge to
the user.
2.1.3 Confined space precautions
D A N G E R
Explosion hazard. Training in pre-entry testing, ventilation, entry procedures, evacuation/rescue
procedures and safety work practices is necessary before entering confined spaces.
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The information that follows is supplied to help users understand the dangers and risks that are
associated with entry into confined spaces.
On April 15, 1993, OSHA's final ruling on CFR 1910.146, Permit Required Confined Spaces, became
law. This standard directly affects more than 250,000 industrial sites in the United States and was
created to protect the health and safety of workers in confined spaces.
Definition of a confined space:
A confined space is any location or enclosure that has (or has the immediate potential for) one or
more of the following conditions:
• An atmosphere with an oxygen concentration that is less than 19.5% or more than 23.5% and/or a
hydrogen sulfide (H2S) concentration that is more than 10 ppm.
• An atmosphere that can be flammable or explosive due to gases, vapors, mists, dusts or fibers.
• Toxic materials which upon contact or inhalation can cause injury, impairment of health or death.
Confined spaces are not designed for human occupancy. Confined spaces have a restricted entry
and contain known or potential hazards. Examples of confined spaces include manholes, stacks,
pipes, vats, switch vaults and other similar locations.
Standard safety procedures must always be obeyed before entry into confined spaces and/or
locations where hazardous gases, vapors, mists, dusts or fibers can be present. Before entry into a
confined space, find and read all procedures that are related to confined space entry.
2.2 Compliance and certification
CAUTION
This equipment is not intended for use in residential environments and may not provide adequate protection to
radio reception in such environments.
Canadian Radio Interference-Causing Equipment Regulation, ICES-003, Class A:
Supporting test records reside with the manufacturer.
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne
sur les équipements provoquant des interférences.
FCC Part 15, Class "A" Limits
Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC
Rules. Operation is subject to the following conditions:
1. The equipment may not cause harmful interference.
2. The equipment must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications to this equipment not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. This equipment has been tested
and found to comply with the limits for a 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 their expense. The following techniques can be used to reduce
interference problems:
1. Disconnect the equipment from its power source to verify that it is or is not the source of the
interference.
2. If the equipment is connected to the same outlet as the device experiencing interference, connect
the equipment to a different outlet.
3. Move the equipment away from the device receiving the interference.
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4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
2.2.1 Hazardous location
WARNING
Explosion hazard. The GS1440 sensor is not approved for use in hazardous locations.
The GS2440EX sensor is compliant with ATEX (EU), UKEX (UK), IECEx and North American
(US/Canada) hazardous location requirements. Refer to Table 1 on page 3. It is important for the
user to obey all of the conditions of use to keep safety compliance.
• The GS2440EX sensor is an isolated metal part with a maximum capacitance of 97.2 pF on the
enclosure screws. Make sure to use grounding or installation conditions that prevent electrostatic
charging of the GS2440EX sensor. Refer to the instruction manual from the manufacturer for
instructions on how to prevent electrostatic charging.
• The GS2440EX sensor must not be disassembled.
• If the GS2440EX sensor is installed in a hazardous location, it is the responsibility of the end user
to select the correct barriers to use with the sensor.
• Obey all ATEX, UKEX, IECEx, North American Classification Certificate specifications and the
national and local regulations.
• Obey the safety warnings of the other intrinsically safe (Ex) equipment installed near the sensor.
2.2.2 EMI (electro-magnetic interference)
The GS1140 and GS2440EX sensors are compliant with the certifications that follow:
• EU EMC Directive 2014/30/EU
• UKCA Electromagnetic Compatibility Regulations 2016
• FCC Part 15B
• ICES-003
2.3 Icons used in illustrations
Manufacturer supplied parts Do not use tools
2.4 Intended use
The GS1440 and GS2440EX sensors are intended for use by wastewater professionals to monitor
levels of hydrogen sulfide (H2S) in liquids and air. The GS1440 and GS2440EX sensors are not
intended to measure other types of dissolved sulfide, such as HS- or S2-. Typical installation locations
are primary wastewater treatment, wastewater collection and wastewater conveyance systems.
2.5 Product overview
D A N G E R
Do not use the GS1440 or GS2440EX sensor as a safety device to identify the hydrogen sulfide
concentration in an area. Obey all applicable regulations and occupational health and safety
precautions before entry into confined spaces and toxic hazard environments. Get advice from the
occupational health and safety department at the workplace or the government regulatory body to
identify the possible hazards and safety standards.
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N O T I C E
Do not point the measuring end of the sensor up or damage to the sensor can occur (e.g., during storage,
transport, calibration, installation and operation).
Keep the sensor at 0 to 40 °C (32 to 104 °F) or damage to the sensor will occur.
The GS1440 and GS2440EX sensors continuously measure the hydrogen sulfide (H2S)
concentration in liquids and air. Refer to Figure 1.
The sensor is used with a device that supplies 4–20 mA loop power to the sensor and receives the
sensor measurements as a 4–20 mA analog signal or RS-232 digital signal.
The GS1440 is made for use in non-hazardous locations. The GS2440EX is made for use in
hazardous locations.
Figure 1 GS1440 and GS2440EX
1 Membrane 5 RS-232 connector
2 Sensor cap 6 Grounding screw (M6)
3 Status LED3 (Table 4)7 Power/4–20 mA connector
4 Attachment hook
Table 4 Status LED
Color Status
Green, one flash The 4–20 mA analog output represents 0–5 mg/L (liquids).
Green, two flashes The 4–20 mA analog output represents 0–1000 ppm (air).
Green and red flashes The sensor is in calibration/configuration mode.
Red, flashes Temporary (with calibration cap attached): Calibration was not successful.
Continuous (without calibration cap attached): There is a problem with the sensor.
3The status LED continuously flashes while power is supplied to the sensor.
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2.6 Product components
Make sure that all components have been received. Refer to Figure 2. If any items are missing or
damaged, contact the manufacturer or a sales representative immediately.
Figure 2 Product components
1 Storage tube 2 GS1440 or GS2440EX sensor
2.7 Accessories
Figure 3 shows the accessories for the sensor. Refer to Parts and accessories on page 23 for
ordering information.
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Figure 3 Accessories
1 Cable guard extension 10 Power/4–20 mA barrier with power supply
2 Cable guard 11 Mounting bracket for wall or DIN rail, USA and
Canada
3 Suspension chain with carabiners 12 CAx440EX field transmitter, USA and Canada
4 Cable pull-through tool 13 Mounting bracket for wall or DIN rail, EU and UK
5 Air flow cell 14 CAx440EX field transmitter, EU and UK
6 RS-232 sensor cable 15 Crossbeam clamps
7 Power/4–20 mA sensor cable 16 Adapter for inline mounting and Tee, 1 ¼-inch
BSPT or NPT
8 Crossbeam for manholes 17 Batteries for CAx440EX field transmitter (non-
rechargeable)
9 External antenna for CAx440EX field transmitter 18 CDx440sc gateway for SC Controller
Section 3 Attach the cable guard
If the sensor will be installed in water (or if an increase in the water level could put the sensor in
water), attach the cable guard to the sensor to prevent damage to the sensor connectors and cables.
If the sensor cables are already installed in the cable guard, refer to the illustrated steps in Figure 4
to attach the sensor cables and cable guard.
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If the sensor cable(s) is not installed in the cable guard, refer to the instructions supplied with the
cable guard to install the sensor cable(s) in the cable guard and attach the sensor cables and cable
guard.
Note: For measurements in water where large changes in the water depth can occur (e.g., wells and reservoirs),
attach the optional cable guard extension (item 1, Figure 3 on page 10) and then the cable guard to the sensor.
Refer to the instructions supplied with the cable guard extension.
Figure 4 Attach the cable guard
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Section 4 Installation
D A N G E R
Explosion hazard. Trained personnel only must install or commission the equipment.
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4.1 Electrical installation
WARNING
The figures that follow show the options to install the sensor in a non-hazardous location. To install
the GS2440EX sensor in a hazardous location, refer to the instructions in the GS2440EX Hazardous
Location Safety Precautions and CAx440EX Field Transmitter Hazardous Location Safety
Precautions documents.
Connect the sensor to one of the options that follows:
• CAx440EX field transmitter—Figure 5
• CAx440EX field transmitter and a device—Figure 6
• CDx440sc gateway and an SC Controller—Figure 7
• Device—Figure 8
Figure 5 CAx440EX field transmitter
1 Non-hazardous area 4 RS-232 sensor cable
2 Sensor 5 Field transmitter
3 Power/4–20 mA sensor cable 6 DC power cable (optional, user supplied)4
Figure 6 CAx440EX field transmitter and a device
1 Non-hazardous area 5 Field transmitter
2 Sensor 6 Device cable, 4-20 mA analog output of sensor
(user supplied)
3 Power/4–20 mA sensor cable 7 Device (e.g., SCADA or PLC)
4 RS-232 sensor cable 8 DC power cable (optional, user supplied)4
4A DC power supply can be used as an alternative to batteries or with batteries in the field
transmitter. Refer to the CAx440EX field transmitter documentation for instructions.
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Figure 7 CDx440sc gateway and an SC Controller
1 Non-hazardous area 5 CDx440sc gateway
2 Sensor 6 Digital extension cable
3 Power/4–20 mA sensor cable 7 SC Controller
4 RS-232 cable
Figure 8 Device—Direct analog (4-20 mA) or digital (RS-232) communication
1 Non-hazardous area 4 RS-232 cable (optional)
2 Sensor 5 Device (e.g., SCADA or PLC)
3 Power/4–20 mA sensor cable (12 to 28 VDC,
4-20 mA loop power)
4.1.1 Cut the sensor cable (optional)
If necessary, cut the sensor cable(s) to decrease the length. After a sensor cable(s) is cut, prepare
the sensor wires as shown in Figure 9. Make sure to cover the bare wire of the two shield wires with
wire insulation.
Note: When two sensor cables are used, the sensor cables must be attached to each other with zip ties to keep the
EMC compliance rating, unless the sensor cables are installed in conduit.
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Figure 9 Prepare the sensor cable wires
4.1.2 Wiring information
To connect the sensor to the field transmitter (or the field transmitter and a device), refer to the
CAx440EX field transmitter documentation for wiring information.
To connect the sensor to a CDx440sc gateway and an SC Controller, refer to the CDx440sc gateway
documentation for wiring information.
To connect the sensor to only a device, refer to Table 5 and Table 6.
Table 5 Power/4–20 mA sensor cable
Connector pin Wire color Signal
1 Brown Positive
(12 to 28 VDC, 4-20 mA loop power)
2 White Not used
3 Blue Negative
4 Black Not used
5 Silver Shield
Table 6 RS-232 sensor cable
Connector pin Wire color Signal
1 Brown Sensor RXD (receive)
2 White Not used
3 Blue Sensor TXD (transmit)
4 Black GND (ground)
5 Silver Shield
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4.2 Calibration
The sensor must be calibrated before initial use. Then, calibrate the sensor again at 1-month
intervals for the best accuracy. Refer to the calibration instructions supplied with the calibration kit,
which is sold by CertGas (https://certgas.com).
Before calibration, make sure that the statements that follow are true:
• The measurement location is within the operating temperature range of the sensor. Refer to
Table 1 on page 3.
• The sensor is clean. Refer to Examine and clean the sensor on page 20.
• The Power/4-20 mA sensor cable supplies power to the sensor.
• The RS-232 sensor cable is attached to the sensor, if applicable.
Note: The sensor may be calibrated less frequently (at 2- to 3-month intervals). However, more frequent
calibrations increase the accuracy of the sensor.
Note: More frequent calibration may be necessary for sensors submerged in high-fouling locations (e.g., post-
dosing).
4.3 Change the measurement units of the 4–20 mA output
The status LED on the sensor shows the measurement units currently represented by the 4–20 mA
analog output. Refer to Table 7.
When only the Power/4-20 mA sensor cable is used (no RS-232 sensor cable) for communication,
change the measurement units represented by the 4–20 mA analog output so they are correct for the
type of measurement: mg/L (liquid measurements) or ppm (air measurements).
To change the measurement units, do the steps that follow:
Note: This procedure does not change the RS-232 signal from the sensor.
1. Remove the unwanted material that has collected on the sensor. Refer to Examine and clean the
sensor on page 20.
2. Disconnect the cables from the sensor.
3. Install the calibration cap on the sensor. Refer to the instructions supplied with the calibration cap
and flow regulator for the correct installation.
4. Connect the Power/4-20 mA cable to the sensor. Make sure that the Power/4-20 mA sensor
cable supplies power to the sensor.
5. When the Status LED on the sensor flashes red and green, remove the calibration cap from the
sensor.
The status LED flashes green again to show the new measurement units.
Table 7 Status LED
Color Measurement units
Green, one flash 0–5 mg/L, liquid measurements
Green, two flashes 0–1000 ppm, air measurements
4.4 Mechanical installation
4.4.1 Installation options
Figure 10 and Figure 11 show the different sensor installation options.
Note: Do not attach the sensor to a wall, because rags and unwanted material will collect on the sensor.
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Figure 10 Inline or free-hanging
1 Inline 3 Free-hanging in air
2 Free-hanging in liquid
Figure 11 Plumbed to a bypass air line
4.4.2 Installation guidelines
• Keep the sensor away from direct sunlight, heat sources, corrosive chemicals or gases (all but
H2S), mechanical impacts, abrasive materials, vibrations, shocks, dust and radioactive emissions.
• Do not use the sensor outside the specified electrical, mechanical, and thermal parameters, or
outside the measurement range. Refer to Specifications on page 3.
• If the sensor will be installed in water (or if an increase in the water level could put the sensor in
water), attach the cable guard to the sensor to prevent damage to the sensor connectors and
cables. Refer to Attach the cable guard on page 10.
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• For the most accurate measurements, measure the concentration of hydrogen sulfide in the water,
not in the air.5
• In a gravity system, measure as near to the end of a pressurized water pipe as possible to get an
accurate measurement of the initial hydrogen sulfide concentration. Dissolved hydrogen sulfide is
released from water when the water enters an aerated well.
• For air measurements, install the sensor so that the measuring end of the sensor is higher than
the water level during high-water events so that unwanted material does not collect on the sensor.
• Install the sensor in a location with sufficient flow and turbulence around the sensor so unwanted
material does not collect on the sensor.
• Keep the sensor out of stagnant water or biofouling will occur.
4.4.3 Install the sensor
D A N G E R
Gas exposure hazard. Hydrogen sulfide is a highly toxic gas. Put on the personal protective
equipment identified in the safety data sheet (MSDS/SDS). Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
N O T I C E
Do not point the measuring end of the sensor up or damage to the sensor can occur (e.g., during storage,
transport, calibration, installation and operation).
N O T I C E
If the sensor installation is free-hanging, make sure that the installation prevents damage to the sensor. Do not let
the sensor hit objects, walls or bottom surfaces.
Pre-requisites:
• The sensor cables are connected to the sensor and a field transmitter or a device. Refer to
Electrical installation on page 13.
• The sensor has been calibrated at the measurement location. Refer to Calibration on page 16.
5When hydrogen sulfide is measured in the water, the measurement is not dependent on the daily
changes in ventilation conditions in the space above the water or the installation location of the
sensor.
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• If the sensor will be installed in water (or if an increase in the water level could put the sensor in
water), the cable guard is attached to the sensor. Refer to Attach the cable guard on page 10.
• The measurement units represented by the 4–20 mA analog output are correct for the type of
measurement: mg/L (liquid measurements) or ppm (air measurements). Refer to Change the
measurement units of the 4–20 mA output on page 16.
1. For installation in water, do the steps that follow:
a. (Optional, recommended) Connect the eye bolt on the cable guard to earth ground in
accordance with local, regional and national requirements.
For hazardous location installation, refer to the GS2440EX Hazardous Location Safety
Precautions document for the grounding requirements.
b. Attach the chain to the eye bolt on the cable guard.
c. Attach the other end of the chain to an object that is directly above the water and does not
move (e.g., wire grid, crossbeam or the crossbeam clamps for the field transmitter).
d. Lower the sensor into the water. Keep the sensor cables out of the water.
e. Make sure that the upstream side of the sensor is in a moving stream of water and not near
walls.
f. Adjust the chain length so the cable guard is out of the water and the sensor is 5 cm
(2 inches) or more from the bottom of the channel or well.
g. If the sensor could hit a wall or other objects, put the sensor in a 70-mm (2.75-inch) diameter
PVC pipe or larger. Make sure that the measuring end of the sensor hangs below the PVC
pipe.
Attach the PVC pipe to an object directly above the water that does not move or to the side of
the well.
h. Wind the loose cables into a coil. Use cable ties to hold the cables in position.
2. For installation in air, do the steps that follow:
a. (Optional, recommended) Connect the grounding screw on the sensor to earth ground in
accordance with local, regional and national requirements.
For hazardous location installation, refer to the GS2440EX Hazardous Location Safety
Precautions document for the grounding requirements.
b. Attach a chain (or steel cable) to the attachment hook on the sensor.
c. Attach the other end of the chain (or steel cable) to an object that is directly above the water
that does not move (e.g., wire grid, crossbeam or the crossbeam clamps for the field
transmitter).
d. Lower the sensor.
e. Adjust the chain length as necessary.
f. Wind the loose cables into a coil. Use cable ties to hold the cables in position. Keep the
sensor cables out of the water.
3. For installation in a pressurized water pipe, install the optional adapter for inline mounting. Refer
to the instructions supplied with the adapter for inline mounting.
4. For installation in a pressurized air pipe, plumb a bypass air line to the optional air flow cell. Refer
to the instructions supplied with the air flow cell.
Section 5 Maintenance
N O T I C E
Do not disassemble, modify or repair the instrument. Disassembly will damage the sensor and void the warranty.
If the internal components must be repaired, contact the manufacturer.
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5.1 Examine and clean the sensor
N O T I C E
Do not use force, abrasive materials, chemicals or high-pressure washers or hoses to clean the sensor as
damage to the measuring end of the sensor can occur.
At regular intervals and before calibration, make sure that the measuring end of the sensor is not
covered with unwanted material.
1. Remove the unwanted material that has collected on the sensor.
2. Gently wipe the measuring end of the sensor with a non-abrasive cloth or paper.
3. Use a wet cloth or paper to remove dried material from the sensor.
5.2 Replace the sensor cables
Replace the sensor cables if the sensor cables have damage or as necessary (e.g., to install longer
sensor cables).
When a cable guard is installed on the sensor, refer to the illustrated steps that follow to replace the
sensor cables.
Note: When two sensor cables are used, the sensor cables must be attached to each other with zip ties to keep the
EMC compliance rating, unless the sensor cables are installed in conduit.
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