Envent 330S Manuale utente

Hydrogen Sulfide Analyzer

Model 330S & 331S

Model 330SDS & 331SDS

User’s Manual

Last Updated: December 12, 2022

Revision: 2.8

Table of Contents

1.0 Introduction_______________________________________________________________________ 1

1.1 About This Manual__________________________________________________________________________ 1

1.2 Warranty & Liability Statements _______________________________________________________________ 1

1.2.1 Limitation of Warranty ____________________________________________________________________ 2

1.2.2 Disclaimer ______________________________________________________________________________ 2

1.3 Safety Information__________________________________________________________________________ 2

1.3.1 Key Symbols ____________________________________________________________________________ 3

2.0 Equipment overview ________________________________________________________________ 4

2.1 Theory of Operation ________________________________________________________________________ 4

2.2 Analysis Cycles_____________________________________________________________________________ 6

2.3 Dual Sensor Analysis cycle (SDS) ______________________________________________________________ 7

2.4 Technical Specifications _____________________________________________________________________ 8

3.0 Installation_______________________________________________________________________ 10

3.1 Unpacking _______________________________________________________________________________ 10

3.1.1 Standard spare parts for 330S H2S analyzers: _________________________________________________ 10

3.1.2 Standard spare parts for 331S H2S analyzers: _________________________________________________ 11

3.2 Site Requirements _________________________________________________________________________ 11

3.3 Mounting Requirements ____________________________________________________________________ 12

3.3.1 Space Requirements _______________________________________________________________________ 14

3.3.2 Sample Point Selection___________________________________________________________________ 15

3.3.3 Sample inlet & sample sweep______________________________________________________________ 15

3.3.4 Vent line_______________________________________________________________________________ 15

3.3.5 Sample Volume & Flow Rate_______________________________________________________________ 16

3.3.6 Installation of Analyzer Components ________________________________________________________ 17

4.0 Operation & Configuration___________________________________________________________ 24

4.1 Start-up Procedure ________________________________________________________________________ 24

4.2 Analyzer Display Interface___________________________________________________________________ 25

4.3 Calibration Procedure ______________________________________________________________________ 26

4.3.1 H2S Gas Calibration ______________________________________________________________________ 26

4.3.2 Re-zero Sensor Procedure ________________________________________________________________ 28

5.0 Maintenance______________________________________________________________________ 29

5.1 H2S Sensing Tape Change Procedure __________________________________________________________ 30

5.2 Sample Conditioning System Cleaning Procedure _______________________________________________ 31

5.2.1 Material List____________________________________________________________________________ 31

5.2.2 Cleaning Procedure______________________________________________________________________ 31

6.0 Troubleshooting __________________________________________________________________ 33 
Appendix A - Recommended Spare Parts List__________________________________________________ 43 
Appendix B –Sealing Compound Information _________________________________________________ 44 
Appendix C –Safety Data Sheet for H2S Sensing Tape ___________________________________________ 47 
Appendix D –Risk assessment –Safety information_____________________________________________ 52 
 
List of Figures 
 
Figure 1. H2S Analyzer Principle of Operation _____________________________________________________________ 5
 
Figure 2. H2S Analysis Cycle ___________________________________________________________________________ 6
 
Figure 3. Space Requirements for the 330S & 331S H2S Analyzers ____________________________________________ 14
 
Figure 4. 331S Recommended Venting for 331S (Same for 330S model) _______________________________________ 16
 
Figure 6. Sample Chamber (exploded view) _____________________________________________________________ 19
 
Figure 7. Envent's Humidifier for 330S & 331S (PN 3100006) ________________________________________________ 21
 
Figure 8. Humidfier Unit Installed in a 331S H2S Analyzer __________________________________________________ 22
 
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. Sample Volume & Flow Rate___________________________________________________________________ 16
 
Table 3. Aperture Strips & Ranges _____________________________________________________________________ 20
 
Table 4. Display Button Description/Function____________________________________________________________ 26
 
Table 5. Display LED Description/Function ______________________________________________________________ 26
 
Table 6. H2S Sensing Troubleshooting _________________________________________________________________ 36
 
Table 7. Sensing Tape Troubleshooting_________________________________________________________________ 38
 
Table 8. Electronics Troubleshooting __________________________________________________________________ 41
 
Table 9. Sample Conditioning System Troubleshooting____________________________________________________ 42
 
Table 10. Calibration Troubleshooting _________________________________________________________________ 42
 
Table 11: Recommended Spare Parts __________________________________________________________________ 43
 
Table 12. Hydrogen Sulfide Properties _________________________________________________________________ 52
 
Table 13. Hydrogen Sulfide Quantities & Health Effects ____________________________________________________ 53
 
Table 14: Risk Assessment ___________________________________________________________________________ 56

Envent Engineering Ltd - 330S/DS & 331S/DS User Manual –Revision 2.8

1.0 INTRODUCTION

1.1 About This Manual

This manual provides all the necessary information to install, operate and maintain the 330S,

330SDS, 331S and 331SDS model H2S 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. This analyzer can measure a wide range of H2S concentrations from parts per billion

(ppb) concentrations to parts per million (ppm) concentrations. With the addition of a dilution

sample system, it can read high concentrations in percentage up to 100%. There are other options

available such as the sample system for H2S analysis in liquids or the addition of a hydrogen

reaction furnace for total sulfur measurements.

This document will be referring to models 330S and 331S. However, the information applies equally

to the 330SDS and 3301SDS (dual sensor), unless otherwise stated. To clarify, the difference

between an S model and an SDS model analyzer is the second sensor. The "SDS" has the capability

to measure H2S from two different samples at the same time.

1.2 Warranty & Liability Statements

Products produced and supplied by the manufacturer (Envent Engineering Ltd), unless otherwise

stated, are warranted against defects in materials and workmanship for up to 18 months from the

shipping date or up to 12 months from the start-up date (whichever comes first). During the

warranty period the manufacturer can choose to either repair or replace products which prove to

be defective.

The manufacturer or its representative can provide warranty service at the buyer's facility only

upon prior agreement. In all cases, the buyer has the option of returning the product for warranty

service to a service facility designated by the manufacturer or its representative. The buyer shall

prepay all shipping charges for products returned to a service facility. The manufacturer or its

representative shall pay all shipping charges for the return of products to the buyer. The buyer may

also be required to pay round-trip travel expenses and labour charges (at prevailing labour rates) if

the warranty has been violated. The warranty may be considered violated for any of the reasons

listed below.

Envent Engineering Ltd - 330S/DS & 331S/DS User Manual –Revision 2.8

1.2.1 Limitation of Warranty

The foregoing warranty shall not apply to defects arising from:

•Improper or inadequate maintenance of the product by the user

•Improper unpacking or installation procedures

•Inadequate site preparation

•Unauthorized modification or misuse of the product

•Operation of the product in unfavorable environments such as at high temperatures, high

humidity, or in corrosive atmospheres

•Operation of the product outside of the published specifications

Envent Engineering Ltd carries no responsibility for damage caused during transportation or

unpacking, unless otherwise specified in the incoterms.

An extended warranty may be available with certified start-up. Contact Envent Engineering Ltd for

details.

Envent Engineering Ltd reserves the right to change the product design and specifications at any

time without prior notice.

1.2.2 Disclaimer

No other warranty is expressed or implied. The manufacturer specially disclaims the implied

warranties of merchantability and fitness for a particular purpose. The sole remedy of the buyer

shall in no case exceed the purchase price of the analyzer. The manufacturer shall not be liable for

personal injury or property damage suffered in servicing the product. The product should not be

modified or repaired in any manner differing from procedures established by the manufacturer.

1.3 Safety Information

The procedures and settings outlined in this manual constitute what is considered proper use of

the equipment in question. The equipment was designed and tested under the assumption that

these procedures and settings will be adhered to. Applying values outside of the provided ranges

(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

safe operation of the equipment.

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.

Indicates additional information intended to help clarify an earlier statement or to aid in the

reader’s understanding of a given topic.

Envent Engineering Ltd - 330S/DS & 331S/DS User Manual –Revision 2.8

2.0 EQUIPMENT OVERVIEW

2.1 Theory of Operation

Envent's models 330S and 331S H2S analyzers use ASTM D4084 –07: Standard Test Method for

analysis of hydrogen sulfide in gaseous fuels (Lead Acetate reaction rate method). This method

uses lead acetate impregnated paper. Throughout this document the term lead acetate tape will

be written as "H2S sensing tape".

The H2S sensing tape reacts when in contact with hydrogen sulfide by the compound relationship

shown below. This tape does not react to any other sulfur compounds in the gas stream. This

makes it free from interference when more than one sulfur compound is present in the sample

stream. The H2S reaction is visibly evident by a brown stain directly on the H2S sensing tape.

COOHCHPbSCOOCHPbSH OH 3232 2)( 2+⎯⎯ →⎯+

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

H2S is in contact with the H2S sensing tape, the analyzer sensor reads 1000 mV (+/- 100 mV).

The sensor block has a LED and a photodiode detector. The LED emits a red beam of light which is

reflected off the H2S sensing tape to the photodiode which detects the light intensity. The darker

the H2S sensing tape becomes, when in contact to H2S, the less light the photodiode detector

receives reducing the millivolt value, which in turn, increases the H2S value. The "SDS" models

uniquely measures rate of change on both sides of the H2S sensing tape, allowing for

simultaneous readings of two separate samples.

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

depending on the application, allows the gas to come into contact with the H2S sensing tape,

creating a brown stain.

Flow and pressure are the most important variables when measuring H2S and must be kept at a

constant state for the analyzer to measure H2S properly. Pressure should be kept at a constant 15

psig, unless otherwise stated. The lowest pressure found to be tolerable for proper H2S

measurement is 0.5 psig. Flow must be kept at a constant flow of 2 cm (approximately 83.63

cc/min). A change in flow of +/- 1 cm affects the reading by 10% of full range.

Envent Engineering Ltd - 330S/DS & 331S/DS User Manual –Revision 2.8

2.2 Analysis Cycles

The analysis of the color rate of change on the H2S sensing tape is measured in analysis cycles. An

analysis Cycle lasts up to a maximum of 720 seconds (12 minutes).

Do not change the Maximum Analysis Time, consult Envent Engineering Ltd.

Analyzers sold prior to Mid-August 2016 are set to have a 360 second analysis cycle.

Once an analysis cycle is complete, the motor moves the H2S sensing tape giving the sensor block

new tape surface area to start the analysis again. In normal operation, if the analyzer is being

exposed to H2S within its range, the analysis cycle should last between 150 to 210 seconds (1.5 to

2.5 min); the cycle lasts 720 seconds if no H2S is present.

Figure 2: H2S Analysis Cycle

Figure 2 shows a complete analysis cycle from when the motor has finished advancing the H2S

sensing tape from a previous analysis (1) to the end of the current analysis (4). Once the H2S

sensing tape has finished moving and new tape surface area is exposed, the reflection of light

from the LED to the photodiode detector is at its maximum and results in a voltage output from

the sensor block of 1000 mV (+/- 100 mV). This mV reading is captured by the analyzer, and it is

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