ST3 NE-MOS H2S Toxic Gas Sensor
PMS - Uncoated
PMS - Coated
PMS
FGD_PDS_ST3_NE-MOS_Toxic_Gas_Sensor
ST3 NE-MOS Toxic Gas Sensor
Millennium II Series SMART Sensors
The ST3 NE-MOS series of SMART metal oxide
semiconductor toxic gas sensors provide high
specificity, fast response, and long life. All ST3
sensors are part of the universal Millennium II
Gas Detection platform and are compatible
with the M21, M22, and M2B transmitters.
Our advanced sensor design employs the
latest nano-enhanced, solid state gas sensing
technology with very low power consumption.
ST3 Sensors shown with JB-MPD-A/S
Product Data Sheet
April 2013
“SMART” Gas Detector Series
SMART Sensor Technology, Transmitter
Automatically Recognizes Sensor Configuration
Lowest Power Consumption Available
Long Range (+2000ft.) Sensor Separation
Industry Leading 2 Year Warranty
Single or Dual Channel Transmitter Available
There’s no longer the need to purchase multiple gas specific
detectors. You have the option to utilize 1 or 2 toxic and/or
combustible gas sensors on a single Millennium II transmitter
and easily mix and match any of our sensor technologies.
SMART Sensor Technology
SMART (Self Monitoring Analysis and Reporting Technology)
sensors are pre-calibrated and easily connected to the
transmitter which instantly recognizes a newly fitted sensor,
automatically uploading it’s specific configuration profile.
Digital Communications
Sensor and transmitter continuously communicate digitally,
giving you the confidence of stable, accurate protection with
fast response times even over long separation distances.
Field Selectable Gas Ranges (20/50/100 ppm)
Recovers Quickly from High Gas Concentrations
Fine-tuned Specific Response Ensures Accurate
Detection, Even In The Presence of Other Gases
Designed to Perform in the Most Extreme
Industrial Environments
Nano-technology Enhanced Sensing
Sensor utilizes recent advances in nano-engineered materials
to dramatically increase the sensor’s sensitivity, selectivity, and
stability. This technology is quite robust and ideal for dry/hot
applications, provides leading response times, and the sensor
does not “fall asleep”, a common issue with traditional MOS
sensing materials.
Advanced Environmental Immunity
The ST3 Series of toxic gas sensors are all internally
temperature-compensated to their target gas as well as the
particular field-selected range (20/50/100 ppm) in order to
provide as stable a sample as possible to the sensing element.
Global Certifications
The ST3 Series has been approved to international hazardous
area safety standards for functional operation and performance.
ST3 NE-MOS H2S Toxic Gas Sensor
PMS - Uncoated
PMS - Coated
PMS
Product Data Sheet
FGD_PDS_ST3_NE-MOS_Toxic_Gas_Sensor
ST3 NE-MOS Toxic Gas Sensor
Specifications
“SMART” Gas Detector Series
HYDROGEN SULPHIDE [H2S]
(SOLID STATE NE-MOS)
P/N: ST321(A/S)-100-ASSY
Performance
Response Time T20 ≤ 7sec
T50 ≤ 13sec
T90 ≤ 17sec
Accuracy (+/–) 2ppm
Detection Range 0—20/50/100 ppm
(Field Selectable)
Zero Drift 2ppm over 6 months
Repeatability (+/–) 1ppm or 5% full scale
Environmental
Temperature Certified: -40°C to +60°C (-40°F to 140°F) | Performance Verified: -40°C to +65°C (-67°F to 149°F)
Relative Humidity 0–95% RH non condensing
IP/NEMA Rating IP64 - NEMA 4X
Enclosure
Metallurgy Aluminum or 316 SS
Certifications
Sensor Separation
Transmitter Req’d
Warranty
North American - Class I, Division 1, Groups BCD, T5; Class I, Zone 1, Group IIB+H2 - Type 4X, IP64
ATE X - II 2 G Exd IIB+H2 T5 IP64
IECEx (pending)
INMETRO - Ex d IIB+H2 T4 Gb IP66/67
ANSI/ISA-S 92.0.01
SIL2 Rated
Up to 2000 feet/600 meters (18 AWG cabling)
Millennium II Series (M21, M22, M2B)
2 years
April 2013
ST3 NE-MOS H2S Toxic Gas Sensor
PMS - Uncoated
PMS - Coated
PMS
Aluminum Housings 6.3 160 5.6 142 5.4 137 9.7 246 6.0 152
Stainless Steel Housings 5.9 150 5.1 130 4.6 117 8.9 226 6.0 152
Aluminum Housings 5.7 145 2.6 66 2.9 74 4.1 103
Stainless Steel Housings 5.8 147 2.6 66 2.9 74 3.9 100
FGD_PDS_ST3_NE-MOS_Toxic_Gas_Sensor
ST3 NE-MOS Toxic Gas Sensor
Accessories and Ordering Information
Product Data Sheet
April 2013
JB-MPD-S Termination Box - Digital Output - Stainless Steel
JB-MPD-A Termination Box - Digital Output - Aluminum
CCS-1 Calibration Cup/Rain Shield/Splash Guard/Dust
Filter with DF-1
DSC-1 Dust / Sand protective clip (includes DF-1
disposable filter)
IPF-001 IP 66/67 Filter for SX3 Series sensors, enhanced
sensor protection from contamination by dirt and
moisture
Drawings and Dimensions
Aluminum Housings 6.3 160 5.6 142 5.4 137 9.7 246 6.0 152
Stainless Steel Housings 5.9 150 5.1 130 4.6 117 8.9 226 6.0 152
Aluminum Housings 5.7 145 2.6 66 2.9 74 4.1 103
Stainless Steel Housings 5.8 147 2.6 66 2.9 74 3.9 100
ORDERING INFORMATION
ST321A-100-ASSY (Aluminum Housing)
Hydrogen Sulfide [H2S], 0-20/50/100ppm Field Selectable
ST321S-100-ASSY (Stainless Steel Housing)
Hydrogen Sulfide [H2S], 0-20/50/100ppm Field Selectable
A B C D E
F G H I
ST3 NE-MOS H2S Toxic Gas Sensor
PMS - Uncoated
PMS - Coated
PMS
FGD_PDS_ST3_NE-MOS_Toxic_Gas_Sensor
Product Data Sheet
April 2013
HEADQUARTERS:
FLAME AND GAS DETECTION
Emerson Process Management
Net Safety Monitoring Inc.
2721 Hopewell Place NE
Calgary, Alberta, Canada T1Y 7J7
T +1 (403) 219 0688
T 1 866 FIREGAS
F +1 (403) 219 0694
www.net-safety.com
©2013 Emerson Process Management. All rights reserved.
Emerson Process Management, Rosemount Analytical, and Net Safety Monitoring are marks of Emerson Process Management group of
companies. All other marks are the property of their respective owners.
The contents of this publication are presented for information purposes only, and while effort has been made to ensure their accuracy, they
are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or
applicability. All sales are governed by our terms and conditions, which are available on request. We reserve the right to modify or improve the
designs or specifications of our products at any time without notice.
∞
Please refer to manuals for complete specifications.
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