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ST3 XChem Toxic Gas Sensors
FGD-PDS-ST3-XChem-Toxic-Gas-Sensors
ST3 XChem Toxic Gas Sensors
Millennium II Series Sensors
The ST3 XChem series of electrochemical
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 latest design employs
our “SimpleClick” sensor element design and
low power consumption.
Product Data Sheet
April 2016
Sensor end of life diagnostic
Plug and play design where the transmitter
automatically recognizes sensor conguration
Low power consumption increases uptime
Two year warranties available on most sensors
Field selectable gas ranges
Designed to perform in the most extreme
industrial environments
Sensor End of Life Diagnostic
As part of the normal lifecycle of an electrochemical sensor the
sensor is required to be monitored and replaced on a regular
basis. The end of life diagnostic automatically determines the
health of the electrochemical sensor cell and provides a fault
condition alerting the user the sensor needs to be replaced.
Single or Dual Channel Transmitter
Available
There is no longer the need to purchase multiple gas specic
detectors. You have the option to use one or two toxic or
combustible gas sensors on a single Millennium II transmitter
and easily mix and match any type of sensor in the Millennium II
platform.
ST3 Sensors shown with JB-MPD-A/S.
Plug and Play Design
The ST3 XChem series sensors are pre-calibrated and easily
connected to a transmitter that recognizes a newly tted
sensor, uploading its specic conguration prole.
Improved Triple Electrode Design
Robust material on sensing, reference, and counter electrodes
within the ST3 sensing element ensure long life and enhanced
performance.
Advanced Environmental Immunity
ST3 XChem toxic gas sensors are temperature compensated
to their target gas and eld selected gas concentration range
to provide an accurate and stable gas concentration reading.
Humidity is also controlled through the use of an advanced
diffusion process as gases pass through our specialized
hydrophobic barrier.
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ST3 XChem Toxic Gas Sensors
Specifications
Table 1 - ST3 XChem Toxic Gas Sensor
April 2016
Hydrogen Sulfide [H2S]
(Electrochemical)
P/N: ST320(A/S)-100-ASSY
Performance
Response Time
(without accessories)
Accuracy 0 °C to +50 °C (+32 °F to +122 °F)
Detection Range 0—20/50/100 ppm
Zero Drif t < 5 % full scale per year
Repeatability < 3 % full scale
Calibration Frequency 3 months
Shelf Life 6 months
Environmental
Operating
Temperature
Storage Temperature +3 °C to +20 °C (+37 °F to +68 °F) 0 °C to +20 °C (+32 °F to +68 °F)
Relative Humidity 15–90 % RH non condensing
Ingress Protection
(IP) Rating
Enclosure
Weight Stainless Steel: 3.5 lbs (1.4 kg)
Enclosure Material Aluminum (AL6061)
Certifications North American
T20: 10 s
T50: 15 s
T90: 36 s
±6 ppm or 17 % of reading, whichever
is greater
-40 °C to 0 °C (-40 °F to +32 °F)
±7 ppm or 27 % of reading, whichever
is greater
(Field Selectable)
-40 °C to +50 °C
(-40 °F to +122 °F)
IP64
Aluminum: 1 lb (0.4 kg)
or stainless steel (SS316)
Carbon Monoxide [CO]
(Electrochemical)
P/N: ST360(A/S)-1000-ASSY
T20: 10 s
T50: 15 s
T90: 30 s
0 °C to +50 °C (+32 °F to +122 °F)
±13 ppm or 5 % of reading, whichever
is greater
-20 °C to 0 °C (-4 °F to +32 °F)
±32 ppm or 17 % of reading, whichever
is greater
0—500/1000 ppm
(Field Selectable)
-20 °C to +50 °C
(-4 °F to +122 °F)
Oxygen [O2] Deficiency
(Electrochemical)
P/N: ST341(A/S)-25-ASSY
T20: 7 s
T50: 10 s
T90: 20 s
±0.5 % vol.
0—25 % vol.
Class I Division 1 Groups BCD T5
Ex d IIB+ H
Class I Zone 1 AEx d IIB +H2 T5
IP64
IECEx
Ex d IIB+H2 T5 Gb
IP64
EMC Compliance EN 50270:2006
Sensor Separation Up to 2,000 feet/600 meters (18 AWG cabling)
Transmitter Required Millennium II Series (M21, M22, M2B) For use with the M21-AH-A/S
Warranty Two years
T5
2
or M21-AHR-A/S only
2 EmersonProcess.com/FlameGasDetection
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April 2016
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
Drawings and Dimensions
Table 2 - ST3 XChem Toxic Gas Sensor
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
* Aluminum Shown
Accessories and Ordering Information
ST3 XChem Toxic Gas Sensors
A B C D E
F G H I
Table 3 - ST3 XChem Toxic Gas Sensor
JB-MPD-S Termination Box - Digital Output - Stainless Steel
JB-MPD-A Termination Box - Digital Output - Stainless Steel
CCS-1 Calibration Cup/Rain Shield/Splash Guard/Dust Filter with DF-1
DSC-1 Dust/Sand protective clip (includes DF-1 disposable lter)
IPF-001 IP 66/67 Filter for SX3 Series sensors, enhanced sensor
protection from contamination by dirt and moisture
Order Information
ST320A-100-ASSY (ST320S-100-ASSY Stainless Steel)
Hydrogen Sulde [H
ST341A-25-ASSY (ST341S-25-ASSY Stainless Steel)
Oxygen [O2] Deciency, 0–25 % By Volume
ST360A-1000-ASSY (ST360S-1000-ASSY Stainless Steel)
Carbon Monoxide [CO], 0–500/1000 ppm Field Selectable
S], 0–20/50/100 ppm Field Selectable
2
3EmersonProcess.com/FlameGasDetection
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ST3 XChem Toxic Gas Sensors
FGD-PDS-ST3-XChem-Toxic-Gas-Sensors
EmersonProcess.com/FlameGasDetection
Product Data Sheet
April 2016
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