Envent 330S User Manual
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Envent 330S User Manual

Hydrogen sulfide analyzer
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Hydrogen Sulfide Analyzer
Model 330S & 331S
Model 330SDS & 331SDS
User's Manual
Last Updated: December 12, 2022
Revision: 2.8

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  • Page 1 Hydrogen Sulfide Analyzer Model 330S & 331S Model 330SDS & 331SDS User’s Manual Last Updated: December 12, 2022 Revision: 2.8...

  • Page 3: Table Of Contents

    Dual Sensor Analysis cycle (SDS) ______________________________________________________________ 7 Technical Specifications _____________________________________________________________________ 8 Installation _______________________________________________________________________ 10 Unpacking _______________________________________________________________________________ 10 3.1.1 Standard spare parts for 330S H S analyzers: _________________________________________________ 10 3.1.2 Standard spare parts for 331S H S analyzers: _________________________________________________ 11 Site Requirements _________________________________________________________________________ 11 Mounting Requirements ____________________________________________________________________ 12 3.3.1 Space Requirements _______________________________________________________________________ 14...
  • Page 4 Figure 9. Eductor Block (Venturi Effect) _________________________________________________________________ 23 Figure 10. 330S Display (left) & 331S Display (right) _______________________________________________________ 25 Figure 11. 331S & 331SDS Sensing Tape Change Procedure (Same as 330S & 330SDS models) _____________________ 30 List of Tables Table 1. 330S/331S H2S Analyzer Specifications ___________________________________________________________ 9 Table 2.

  • Page 5: Introduction

    S Analyzer units and the related options. This manual is intended for all technical level users. The Envent 330S/331S hydrogen sulfide (H2S) Analyzer is a uniquely rugged and simple design that utilizes lead acetate-based detection which provides a linear and interference-free output of H2S concentration.

  • Page 6: Limitation Of Warranty

    (such as permitting excessive pressures) or modifying provided procedures is considered improper use of the equipment. Envent Engineering Ltd is not responsible for any injury or property damage caused by improper use of the equipment. Once in the field, the user is solely responsible for the...

  • Page 7: Key Symbols

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 1.3.1 Key Symbols The following symbols are used throughout the manual to call attention to important information. We recommend familiarizing yourself with them before reading further. Indicates a potential hazard that, if not properly addressed, could result in damage to the equipment or injury to the operator Caution: hot surface.

  • Page 8: Equipment Overview

    COOH Equation 1: H2S & Lead Acetate Reaction The electronics built into the models 330S and 331S have been programmed to measure the rate of darkening over time which, in turn, gives the hydrogen sulfide concentration level. When no S is in contact with the H S sensing tape, the analyzer sensor reads 1000 mV (+/- 100 mV).

  • Page 9: Figure 1. H2S Analyzer Principle Of Operation

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Figure 1: H2S Analyzer Principle of Operation Figure 1 above, illustrates flow and pressure regulated, filtered sample gas passing through the humidifier to the sample chamber. An aperture in the sample chamber, which differs in sizes...

  • Page 10: Analysis Cycles

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Analysis Cycles The analysis of the color rate of change on the H S sensing tape is measured in analysis cycles. An analysis Cycle lasts up to a maximum of 720 seconds (12 minutes).

  • Page 11: Dual Sensor Analysis Cycle (Sds)

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 referred to as the "Zero Voltage" or “mV Zero”. The zero voltage will vary for each surface area of the H S sensing tape and will represent the starting point for the H S reading for that cycle.

  • Page 12: Technical Specifications

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 their analysis cycles, the motor will move and new H2S sensing tape area is exposed for a new analysis cycle. It is important to clarify that when the first sensor has finished its analysis cycle, even when it is waiting for the second sensor to complete its analysis cycle, it immediately updates any outputs associated with that sensor (Analog output 4-20 mA, alarms, display H2S value, etc.).

  • Page 13: Table 1. 330S/331S H2S Analyzer Specifications

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Outputs (3) RS-485 Modbus protocol (One RS-485 for remote display option) (continued) Ethernet port as an optional feature 4 SPDT relays (120 VAC 5A maximum) 4 solid state solenoid drivers...

  • Page 14: Installation

    Upon arrival, the packaging should be immediately inspected for any external damage that may have occurred during shipping. If any damage is present, please contact Envent Engineering Ltd and request that the carrier's agent be present when the analyzer is unpacked. If a disagreement arises, the incoterms agreed to by the seller and the customer will overrule any dispute.

  • Page 15: Standard Spare Parts For 331S H S Analyzers

    The model 330S & 330SDS are designed for cETLus Class 1, Division 1, Groups BCD, Temp Code T3C (Tamb 0°C to 50°C). These models are designed for indoor use only. Ensure that the analyzer received is suitable for the electrical classification of the installation site.

  • Page 16: Mounting Requirements

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Mounting Requirements The analyzer should be mounted in an enclosed area in which it is not exposed to vibrations, excessive pressures, extreme temperatures, or environmental variations. The selected installation site should provide adequate room for maintenance and repair procedures.
  • Page 17 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 This unit requires a disconnect device rated 240 VDC and 5A max. It must be protected by a circuit breaker rated 240 VDC and 5A max, and it is to be installed in accordance with local electrical...

  • Page 18: Space Requirements

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 3.3.1 Space Requirements Figure 3: Space Requirements for the 330S & 331S H2S Analyzers...

  • Page 19: Sample Point Selection

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Make sure to leave at least 1 foot of extra space on the left side of the 330S H S analyzer. This will allow proper opening of the side door located at the upper blue chassis where the H S sensing tape is located.

  • Page 20: Sample Volume & Flow Rate

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Figure 4: 331S Recommended Venting for 331S (Same for 330S model) 3.3.5 Sample Volume & Flow Rate The sample should be supplied to the 330S/331S H S analyzer at 10-15 psig and at a flow of 83.63 cc/min (set flowmeter at 2.0).

  • Page 21: Installation Of Analyzer Components

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 3.3.6 Installation of Analyzer Components In this section, the description and installation of the main components of the 330S & 331S H analyzers are covered. Total Sulfur and Dilution system options are not covered in this section. Please refer to Total Sulfur and Dilution manuals.
  • Page 22 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Figure 5: AO 4-20 mA Output Wiring Options...

  • Page 23: Figure 6. Sample Chamber (Exploded View)

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 3.3.6.2 Sample Chamber The sample chamber is the component that allows the H S sample to come in contact to the H sensing tape which in turn is read by the sensor block. The sample chamber is made of the...

  • Page 24: Table 3. Aperture Strips & Ranges

    Table 3: Aperture Strips & Ranges Aperture strips can be changed to accommodate for a different range application. Refer to Table 3 shown above to select the best option on the new concentration application. Contact Envent Engineering Ltd to purchase an aperture strip.

  • Page 25: Figure 7. Envent's Humidifier For 330S & 331S (Pn 3100006)

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 3.3.6.3 Humidifier Unit The analyzer should not be exposed to ambient temperatures lower than 0 °C. By default, all 330S/331S H S analyzers have a temperature alarm set to 0 °C descending.

  • Page 26: Figure 8. Humidfier Unit Installed In A 331S H2S Analyzer

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 For the SDS models, the humidifier has two inlet and two outlet ports. It is important to ensure that the tubing is connected to the correct port. The Vinyl tubing that connects to the humidifier are label with 1 and 2, make sure they are matched when installing them to the humidifier.

  • Page 27: Figure 9. Eductor Block (Venturi Effect)

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 3.3.6.4 Eductor Block The analyzer’s reading can be affected by positive or negative pressure on the sample vent line. Pressure changes can be caused by strong winds blowing across or directly into the vent; or by mechanical venting (exhaust fan).

  • Page 28: Operation & Configuration

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 OPERATION & CONFIGURATION Start-up Procedure The following steps should be followed for proper installation and start-up of the analyzer. Before commencing the start-up procedure for the analyzer, please ensure that all sections within “Installation”...

  • Page 29: Analyzer Display Interface

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Operation & Configuration before introducing gas to the rest of the sample system. This allows contamination from construction to be purged prior to entering the analyzer. 8. Allow twenty minutes for the analyzer to stabilize. The analyzer calibration can be verified if calibration gas is available.

  • Page 30: Calibration Procedure

    S analyzer should be calibrated. It will depend on the application, importance of accuracy for the application, and how dirty or clean the environment and sample are. The following is the calibration procedure for the 330S/331S H analyzer: Source a calibration gas of H S in a balance of N2 regulated to 15 psi (check expiry date).
  • Page 31 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Operation & Configuration Press the bypass button and verify the "Bypass" LED illuminates (alarms will be held in the non- alarm state). Turn off all gas supplies to the analyzer and check that a sufficient amount of H S sensing tape is installed.

  • Page 32: Re-Zero Sensor Procedure

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Return to sample gas flow using the 3-way calibration valve. Set the sample gas pressure to 15 psig and set the flow meter to 2.0. Close calibration gas bottle and disconnect.

  • Page 33: Maintenance

    Incorrect configuration of the analyzer may cause incorrect operation. Injury and/or damage to facilities may occur. Check analyzer's functionality after configuration changes have been made. Disassembly of the pressure regulator and solenoids in the field is not advised. Consult Envent Engineering Ltd if the regulator or solenoid appears contaminated.

  • Page 34: H S Sensing Tape Change Procedure

    • Check the sample conditioning filter(s) every time the H S sensing tape is replaced. Replace the filter(s) as required. S Sensing Tape Change Procedure Figure 11. 331S & 331SDS Sensing Tape Change Procedure (Same as 330S & 330SDS models)

  • Page 35: Sample Conditioning System Cleaning Procedure

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Maintenance Sample Conditioning System Cleaning Procedure During start-up or plant upset situations, the 330S/331S H S analyzer may become contaminated with amine or hydrogen sulfide scavenger solution. This may cause the analyzer to read low (this can be determined at calibration).
  • Page 36 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 • Remove all sample conditioning system components and soak in cleaning solution • Ensure valves are fully open when cleaning • Flush sample components with fresh water •...

  • Page 37: Troubleshooting

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 TROUBLESHOOTING H2S Readings Issues Problems Possible Reasons Possible Solutions Erratic H2S Trigger slide and H2S sensing Ensure trigger slide and H2S sensing tape Readings tape not seated properly are seated in the groove of the sample chamber.
  • Page 38 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Regulator not maintaining 15 Replace Regulator, Consult Envent psig (Changing flow rate to Engineering Ltd. analyzer) Contaminants in sample Clean sample chamber, aperture, and chamber window; replace if required. Contact Envent Engineering Ltd for replacement assistance.
  • Page 39 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Troubleshooting H2S Gas Calibration" on page 26. Contact Envent Engineering Ltd to order aperture (if applicable) and for assistance to install new aperture and re- calibrate analyzer. Sensor/ sensor wire failure Re-zero the sensor block.

  • Page 40: Table 6. H2S Sensing Troubleshooting

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 factory gain and new gain should not be greater than +/- 2%. If necessary, do a gas calibration. Refer to "4.3.1 H2S Gas Calibration" on page 26. Not using the humidifier or...
  • Page 41 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Troubleshooting H2S Sensing Tape Issues Problems Possible Reasons Possible Solutions Tape does not No tension on take up reel Check setscrew in take up reel collars, if advance loose;...

  • Page 42: Table 7. Sensing Tape Troubleshooting

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Aperture out of place Take out the sample chamber, unscrew the sensor block and check that the aperture is not out of place. If so, refer to "Aperture Strip"...
  • Page 43 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Troubleshooting IS Barrier failure (For 330S IS Barrier may need replacement. Consult analyzer series only) Envent Engineering Ltd. Contaminants in sample Clean sample chamber. Replace aperture and chamber window if required.
  • Page 44 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Analyzer not Multiple reasons could be Check that the analyzer is ON. communicating causing the analyzer to not with PC communicate properly with the Check that the communication cable is properly connected.

  • Page 45: Table 8. Electronics Troubleshooting

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Troubleshooting The system variable for By factory configuration, the analog output has been modified. outputs (1 & 2) are configured to output based on H2S Sample 1. Make sure that if they are modified, that the right system variables are selected.

  • Page 46: Table 9. Sample Conditioning System Troubleshooting

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Liquid carried over into Consult Envent Engineering Ltd. regulator Problems with the (50 psi) Heated regulator may be required if liquid sample pre-regulator at the hydrocarbon carry over is present at the sample point.

  • Page 47: Appendix A - Recommended Spare Parts List

    Table 11: Recommended Spare Parts Envent H2S Acetate Tape Statement of Shelf Life Envent Engineering H2S sensing tapes are suitable for use, if stored in the original sealed envelope, for 10 years from date of manufacture. Tapes should be stored in a cool dry location.

  • Page 48: Appendix B - Sealing Compound Information

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 APPENDIX B – SEALING COMPOUND INFORMATION...
  • Page 49 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Appendix B...
  • Page 50 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8...

  • Page 51: Appendix C - Safety Data Sheet For H S Sensing Tape

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Appendix C APPENDIX C – SAFETY DATA SHEET FOR H S SENSING TAPE...
  • Page 52 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8...
  • Page 53 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Appendix C...
  • Page 54 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8...
  • Page 55 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 Appendix C...

  • Page 56: Appendix D - Risk Assessment - Safety Information

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 APPENDIX D – RISK ASSESSMENT – SAFETY INFORMATION Hydrogen Sulfide Properties Physical State Usually encountered as a gas Color Colorless - No visible sign of H2S to warn you of its presence Odor Characteristic smell of rotten eggs at 0.5 ppb;...

  • Page 57: Table 13. Hydrogen Sulfide Quantities & Health Effects

    > Rapid unconsciousness, cessation of breathing, and death 700 ppm and > Immediate loss of consciousness above > Permanent brain damage and death in a few minutes even if removed to fresh air at once Table 13. Hydrogen Sulfide Quantities & Health Effects Risk Assessment Hazard Who might be...
  • Page 58 Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 As an overall practice when doing maintenance into an H2S analyzer, the operator should carry a personal H2S monitor, wear a hard hat, hearing protection (if applicable), safety glasses, hand protection, steel toed boots.
  • Page 59 As an overall practice when doing maintenance into an H2S analyzer, the operator should carry a personal H2S monitor, wear a hard hat, hearing protection (if applicable), safety glasses, hand protection, steel toed boots. Depending on the location of the H2S analyzer, appropriate breathing device might be required such as SCBA (Self- contained Breathing Apparatus) and...

  • Page 60: Table 14: Risk Assessment

    Envent Engineering Ltd - 330S/DS & 331S/DS User Manual – Revision 2.8 however, the outside walls will only reach approximately 150 °C. Do not touch surface of the TS enclosure when operating. If the TS enclosure needs to be serviced, allow 1 hour...
  • Page 61 Tel: 1 (713) 567 – 4421 13219 B Stafford Road Missouri City, Texas, USA 77489 China Tel: 86 (138) 0119 – 1148 Room 305, Bld. No.9, Greenland Qihangguoji Email: julie.lu@enventengineering.com Shunyi District, Beijing, China International Sales Tel: (403) 253-4012 Email: international@envent-eng.com...

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