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Envent 331S - User Manual

Envent 331S
60 pages
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Envent Engineering Ltd.
Hydrogen Sulfide Analyzer
Model 330S & 331S
Model 330SDS & 331SDS
U
SER
'
S
M
ANUAL
Revision 2.4
Jan 2019

Table of Contents

Questions and Answers

  • V
    Victoria SmithAug 3, 2025
    Why do I have calibration issues with my Envent Measuring Instruments?
    • A
      Andrew BishopAug 3, 2025
      Calibration issues with your Envent Measuring Instruments may arise if you're not using the correct calibration bottle. Ensure the calibration bottle's range is within the analyzer's range. For improved accuracy, it's recommended that the calibration gas value is close to your alarm setpoint values.
  • Y
    yriceAug 22, 2025
    What to do if liquid carries over in SCS in Envent Measuring Instruments?
    • B
      Brittney AlexanderAug 22, 2025
      If liquid is carried over in the Sample Conditioning System (SCS) of your Envent Measuring Instruments, it could be due to the sample being too wet for the current conditioning system. If this is a one-time occurrence, cleaning of the sample system is required.
  • J
    Jaime VargasNov 13, 2025
    What to do if my Envent Measuring Instruments show erratic H2S readings?
    • W
      William FordNov 13, 2025
      If your Envent Measuring Instruments are showing erratic H2S readings, consider the following potential causes and solutions: * Ensure the trigger slide and H2S sensing tape are correctly seated in the sample chamber groove. * Check for blockages in the vent and/or eductor. Confirm vacuum in the Eductor block. Vent tubing and fittings should be 316 stainless steel 3/8'' or larger on a downward slope. Consider if heat trace is required. * Verify that the analog input 2 jumper is installed across (+4-20 & -4-20) on the controller board. * Re-zero the sensor block. Check for a green status LED on the sensor block and proper mV on the white H2S sensing tape after the procedure. * Check the H2S sensing tape installation. Perform a motor run by navigating to Display>Press Menu Button...

Summary

INTRODUCTION

Contacting Envent Engineering Ltd

Provides contact information for Envent Engineering Ltd.

Warranty & Liability Statements

Limitation of Warranty

Details specific exclusions from the product warranty.

Disclaimer

Key Symbols

Warnings & Cautions

Warnings & Cautions for 330 S & 331 S H2 S Analyzers

Lists critical safety warnings and cautions applicable to both analyzer models.

Warning & Cautions for 330 S Analyzer Only

Details safety warnings and cautions specific to the 330S analyzer model.

Warning & Cautions for 331 S H2 S Analyzer Only

Details safety warnings and cautions specific to the 331S analyzer model.

Analyzer Specifications

PRINCIPLE OF OPERATION

Physical Reaction

Describes the chemical reaction of H2S with the lead acetate tape.

Analysis Cycles

Details the process of measuring H2S concentration through analysis cycles.

Dual Sensor Analysis cycle (SDS)

Explains the analysis cycle process for dual sensor (SDS) models.

INSTALLATION

Installation Requirements

Outlines necessary prerequisites and conditions for installing the analyzer.

Electrical Requirements

Specifies the electrical power and connection requirements for the analyzer.

Location for the System

Provides guidance on selecting an appropriate installation location for the analyzer.

Space Requirements

Details the physical space needed around the analyzer for installation and maintenance.

Sample Path Setup

Covers sample point selection, inlet/sweep, and vent line setup.

Sample Volume & Flow Rate

Details recommended sample volume and flow rate parameters for optimal performance.

Installation of Analyzer Components

Describes the installation of various analyzer components.

Analog Outputs

Explains the setup and function of analog output connections.

OPERATION & CONFIGURATION

Analyzer Display Interface

Explains the analyzer's display, buttons, and LEDs for user interaction.

CALIBRATION PROCEDURES

H2 S Gas Calibration

Details the procedure for calibrating the analyzer using H2S calibration gas.

Re-zero Sensor Procedure

Outlines the steps to re-zero the analyzer's sensor.

MAINTENANCE

H2 S Sensing Tape Change Procedure

Details the process for replacing the H2S sensing tape.

Sample Conditioning System Cleaning Procedure

Explains how to clean the sample conditioning system components.

TROUBLESHOOTING

H2 S Readings Issues

Addresses problems related to inaccurate or erratic H2S readings.

H2 S Readings Issues

Addresses further problems related to inaccurate or erratic H2S readings.

H2 S Sensing Tape Issues

Covers issues related to the H2S sensing tape and its performance.

Electronics Issues

Addresses problems related to the analyzer's electronic components and indicators.

Electronics Issues

Addresses further problems related to the analyzer's electronic components and indicators.

H2 S Sensing Tape Issues

Covers further issues related to the H2S sensing tape and its performance.

Electronics Issues

Addresses additional problems related to the analyzer's electronic components and indicators.

Electronics Issues

Addresses more problems related to the analyzer's electronic components and indicators.

Electronics Issues

Addresses further problems related to the analyzer's electronic components and indicators.

Sample Conditioning System Issues

Helps resolve problems related to the sample conditioning system.

Sample Conditioning System Issues

Addresses further problems related to the sample conditioning system.

Calibration Issues

Helps resolve common calibration problems.

APPENDICES

Recommended Spare Parts List

Lists recommended spare parts for the H2S analyzer.

Chico A Sealing Compound: For sealing fittings in Hazardous Locations

Provides instructions for using Chico A sealing compound in hazardous locations.

Safety Data Sheet for H2 S Sensing Tape

Presents the Safety Data Sheet for the H2S sensing tape.

Risk Assessment - Safety Information

Hydrogen Sulfide Properties

Details the physical properties of hydrogen sulfide.

Hydrogen Sulfide Quantities and Health Effects

Describes health effects associated with different levels of H2S exposure.

Risk Assessment

Evaluates health and safety risks during maintenance tasks.

Risk Assessment

Evaluates health and safety risks during analyzer operation and maintenance.

Risk Assessment

Evaluates health and safety risks, including electrical and electrostatic hazards.

Envent 331S Specifications

General IconGeneral
BrandEnvent
Model331S
CategoryMeasuring Instruments
LanguageEnglish