MODEL: H S-100ppm. Optional 50ppm, 20ppm and 10ppm
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Available in: 24Vdc Version / 12Vdc Version / 10 - 32Vdc
ASSEMBLY CONSISTS OF:
XP-H S housing (supersedes PE-EX-H S-S)
ST1200-XXX sensor (supersedes PE1200-XX-XXX)
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JB2 junction box
CB2 connector board
ELECTROCHEMICAL H S
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DETECTOR
(used with ST1200 H S
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Sensor)
Part Number: MAN-0010-00 Rev 1
Copyright © 2002 Net Safety Monitoring Inc.
Printed in Canada
This manual is provided for informational purposes only. Although the information contained in
this manual is believed to be accurate, it could include technical inaccuracies or typographical
errors. Changes are, therefore, periodically made to the information within this document and
incorporated without notice into subsequent revisions of the manual. Net Safety Monitoring Inc
assumes no responsibility for any errors that may be contained within this manual.
This manual is a guide for the use of a Toxic Gas Transmitter and the data and procedures contained
within this document have been verified and are believed to be adequate for the intended use of the
transmitter. If the transmitter or procedures are used for purposes other than as described in the
manual without receiving prior confirmation of validity or suitability, Net Safety Monitoring Inc does
not guarantee the results and assumes no obligation or liability.
No part of this manual may be copied, disseminated or distributed without the express written consent
of Net Safety Monitoring Inc
Net Safety Monitoring Inc products, are carefully designed and manufactured from high quality
components and can be expected to provide many years of trouble free service. Each product is
thoroughly tested, inspected and calibrated prior to shipment. Failures can occur which are beyond the
control of the manufacturer. Failures can be minimized by adhering to the operating and maintenance
instructions herein. Where the absolute greatest of reliability is required, redundancy should be
designed into the system.
Net Safety Monitoring Inc, warrants its sensors and detectors against defective parts and workmanship
for a period of 24 months from date of purchase and other electronic assemblies for 36 months from
date of purchase.
No other warranties or liability, expressed or implied, will be honoured by Net Safety Monitoring Inc.
Contact Net Safety Monitoring Inc or an authorized distributor for details.
Table of Contents
DESCRIPTION ............................................................... 1
FEATURES .................................................................. 1
SPECIFICATIONS ............................................................ 1
Figure 1 - H S Detector Assembly .......................................... 2
SENSOR OPERATION ......................................................... 3
SENSING ELEMENT .................................................... 3
Table 1 - Cross Sensitivity of Electrochemical Sensor to 100 ppm Concentrations .... 3
SENSOR OUTPUT ..................................................... 3
I NSTALL ATION ............................................................... 3
DETECTOR POSITIONING ............................................... 3
WIRING REQUIREMENTS ............................................... 4
Table 2 - Maximum Wiring Distances Sensor to Controller/Transmitter ............. 4
SENSOR WIRING ...................................................... 4
Figure 2 - Sensor Wiring ................................................. 6
START-UP PROCEDURE ...................................................... 7
CALIBRA TION ............................................................... 7
MAINTENANCE .............................................................. 7
SENSING ELEMENT REPLACEMENT ...................................... 8
TROUBL ESHOOTING ......................................................... 9
Table 3 - Troubleshooting Guide ........................................... 9
SPARE PARTS ............................................................... 9
Appendix A
Net Safety Monitoring Inc. Electrostatic Sensitive Device Handling Procedure . . . . . . . . . . . . . . . i
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Appendix B
Wire Resistance In Ohms ........................................................ii
DESCRIPTION
The Net Safety Monitoring Inc. H S-XXX-XX electrochemical Hydrogen Sulfide (H S) gas detector
consists of an explosion-proof enclosure, electronic circuitry and an electrochemical H S sensing
element. This H S sensor provides continuous monitoring of hydrogen sulphide (H S)
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concentrations in the range of 0 to 100, 50, 20 or 10 parts per million (ppm). The detector can be
used with one of the Net Safety Monitoring Inc. Uni-Trol™ Controllers or with other devices that
are capable of monitoring a 4 to 20 mA dc input and provide for calibration of the incoming signal.
The explosion-proof detector is CSA certified for use in hazardous locations.
FEATURES
< Electrochem ical sensor for increased accuracy, repeata bility and reliability.
< High specificity to H S reduces the chance of false alarms caused by other
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gases.
< Temperature compensation to ensure consistent performance over the entire
operating temperature range.
< Self-contained transmitter circuitry permits use without a separate controller.
< Explosion-proof housing.
< EMI/RFI protected.
SPECIFICATIONS
< Operating Range:
0 to 100 ppm
Optional 0-50ppm, 0-20ppm and 0-10 ppm models available.
< Response Time:
20% full range within 12 seconds.
50% full range within 30 seconds
Note: When H S concentration equal to full scale is applied.
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< Drift:
Less than 2 ppm per month.
< Accuracy:
±10 percent of applied gas concentration or ±3 ppm , whichever is greater.
< Sensor Life:
Comm only 2 to 4 years.
< Operating Voltage:
10 to 32Vdc. 24Vdc nom inal.
< Temperature Range:
Operation: -40ºC to +50ºC (-40ºF to +122ºF)
Recommended Storage: 0ºC to +20ºC (+32ºF to +68ºF)
< Humidity Range:
15 to 90% RH, non-condensing.
< Certification:
CSA certified, Class 1, Division 1, Groups C & D.
< Enclosure Material:
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Anodized alum inum or optional stainless steel.
< Dimensions:
Refer to Figure 1
< Shipping Weight (Approximate):
Housing: 2.5 pounds (1.1 kilograms)
Sensing element: 0.2 pounds (0.1 kilograms)
Figure 1 - H S Detector Assembly
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