HACH GS2440EX Sensor H₂S EX Monitoring in Water or Air User Manual

HACH GS2440EX Sensor H₂S EX Monitoring in Water or Air User Manual

Section 1 Specifications

Specifications are subject to change without notice.

1 Given as a signal for the interfering species in % of H2S signal at equal partial pressures.
2 Given as a signal for the interfering species in % of H2S signal at equal molar concentrations. 4 English

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

⚠ DANGER
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.
NOTICE
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.

2.1.3 Confined space precautions

⚠ DANGER
Explosion hazard. Training in pre-entry testing, ventilation, entry procedures, evacuation/rescue procedures and safety work practices is necessary before entering confined spaces.

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. 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.
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

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

⚠ DANGER
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.

NOTICE
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 4­20 mA loop power to the sensor and receives the sensor measurements as a 4­20 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.
3 The status LED continuously flashes while power is supplied to the sensor. 8 English

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.

2.7 Accessories

Figure 3 shows the accessories for the sensor. Refer to Parts and accessories on page 23 for ordering information.

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.
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.

Section 4 Installation

⚠ DANGER
Explosion hazard. Trained personnel only must install or commission the equipment.

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

4 A 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.

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.

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.

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., postdosing).

4.3 Change the measurement units of the 4­20 mA output

The status LED on the sensor shows the measurement units currently represented by the 4­20 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 4­20 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.

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.

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.
• 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 sulphide concentration. Dissolved hydrogen sulphide 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

⚠ DANGER
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.

NOTICE
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).

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.
  5 When 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.

• 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 4­20 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 4­20 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

NOTICE
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.

5.1 Examine and clean the sensor

NOTICE
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.

5.3 Replace the O-ring

If the O-ring at the connector end of the sensor becomes worn and no longer keeps water out of the cable guard and/or cable guard extension, replace the O-ring. If the O-rings that are seen when the sensor cap is removed become worn and no longer supply a seal when the air flow cell is used, replace the O-rings.

Note: The function of the O-rings that are seen when the sensor cap is removed is to hold the sensor cap and not to keep water out.
A replacement O-ring, O-ring grease and replacement instructions are included in the installation spare parts kit. Refer to Parts and accessories on page 23 for ordering information.

Section 6 Troubleshooting

Section 7 Parts and accessories

⚠ WARNING
Personal injury hazard. Use of non-approved parts may cause personal injury, damage to the instrument or equipment malfunction. The replacement parts in this section are approved by the manufacturer.
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to the company website for contact information.

HACH COMPANY World Headquarters
P.O. Box 389, Loveland, CO 80539-0389 U.S.A.
Tel. 970-669-3050
800-227-4224 (U.S.A. only)
Fax 970-669-2932
orders@hach.com
www.hach.com

HACH LANGE GMBH
Willstätterstraße 11
D-40549 Düsseldorf, Germany
Tel. +49 (0) 2 11 52 88-320
Fax +49 (0) 2 11 52 88-210
info-de@hach.com
www.de.hach.com

HACH LANGE Sàrl
6, route de Compois
1222 Vésenaz
SWITZERLAND
Tel. +41 22 594 6400
Fax +41 22 594 6499

© Hach Company/Hach Lange GmbH, 2023.
All rights reserved. Printed in Denmark.

References

• Geräte und Reagenzien für die Wasserqualitätsanalyse | Hach
• Hach | Hach
• CertGas.com

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