Page 401 - Praxair - Specialty Gases and Equipment Reference Guide

Gas Detection Systems

Gas Sensor/Transmitter

S2 Model Specifications – Non-Explosion Proof
O 2 H 2 S CO Toxics CO 2
Oxygen Hydrogen Sulfide Carbon Monoxide Carbon Dioxide
Sensor
Type Galvanic cell Electrochemical Electrochemical Electrochemical Infrared
Measuring Range 0-25% volume 0 - 100 ppm 0 - 300 ppm See chart below 0 - 5000 ppm
0 - 5% volume
0 - 50% volume
0 - 100% volume
Lower Detectable 0.1% volume 2% of full scale 2% of full scale 2% of full scale 2% of full scale
Limit (LDL)
Accuracy ± 0.5% O 2 ± 5% of reading ± 5% of reading ± 10% of reading or ± 5% of reading or
(whichever is greater) ± 2 ppm H 2 S ± 5 ppm CO ± 5% of full scale ± 2% of full scale
Life Expectancy 2 years with 2 to 3 years with 2 to 3 years with 2 to 3 years with 5 years plus with
normal service normal service normal service normal service normal service
Response Time (T-90) 20 Seconds 45 Seconds 30 Seconds 60 Seconds 30 Seconds
Operating Environment
Location Indoor Class I, Div. 2 Class I, Div. 2 Class I, Div. 2 Class I, Div. 2 Class I, Div. 2
Temperature -4 °F to 122 °F -4 °F to 122 °F -4 °F to 122 °F 14 °F to 104 °F -4 °F to 122 °F
-20 °C to 50 °C -20 °C to 50 °C -20 °C to 50 °C -10 °C to 40 °C -20 °C to 50 °C
Humidity 0-99% RH 0-99% RH 0-99% RH 5-95% RH 0-99% RH
non-condensing non-condensing non-condensing non-condensing
Housing
Housing J-Box Cast aluminum, Cast aluminum, Cast aluminum, Cast aluminum, Cast aluminum,
explosion-proof explosion-proof explosion-proof explosion-proof explosion-proof
Sensor Plastic or aluminum Plastic or aluminum Plastic or aluminum Plastic or aluminum Plastic or aluminum
Controls
Zero Sets transmitter output to 4 mA with zero output from sensor
Span Sets transmitter output to 20 mA with full scale output from sensor
Operating Voltage 19 VDC to 30 VDC 19 VDC to 30 VDC 19 VDC to 30 VDC 19 VDC to 30 VDC 19 VDC to 30 VDC
Output 4-20 mA signal 4-20 mA signal 4-20 mA signal 4-20 mA signal 4-20 mA signal
Controllers Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410, and 800, also PLC and DCS systems
Warranty One year materials and workmanship

Section E – Gas Handling Equipment
Ordering Information Ordering Information –
Non-Explosion Proof Toxic Assemblies
Description Part Number
O 2 Oxygen PRS65-2321RK Part Number Gas Range
H 2 S Hydrogen Sulfide PRS65-2330RK PRS65-2340RK-ASH3 Arsine (AsH 3 ) 0 - 1.5 ppm
CO Carbon Monoxide PRS65-2335RK PRS65-2340RK-NH3 Ammonia (NH 3 ) 0 - 75 ppm
CO 2 Carbon Dioxide (0 - 5000 ppm) PRS65-2397RK-02 PRS65-2340RK-HCN Hydrogen Cyanide (HCN) 0 - 15 ppm
CO 2 Carbon Dioxide (0 - 5.0% volume) PRS65-2397RK-03 PRS65-2340RK-PH3 Phosphine (PH 3 ) 0 - 1.00 ppm
CO 2 Carbon Dioxide (0 - 50% volume) PRS65-2397RK-05 PRS65-2340RK-SO2 Sulfur Dioxide (SO 2 ) 0 - 6.00 ppm
CO 2 Carbon Dioxide (0 - 100% volume) PRS65-2397RK-10

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