Toll Free
Toll Free
Trust PemTech’s gas sensors to detect toxic gases in the air and depleted levels of oxygen. Our Model PT295 Series is a 24 VDC powered toxic gas detector consists of an interface module in a flame proof instrument enclosure and a 316 Stainless Steel sensor head assembly. The detectors monitor a variety of toxic gases in parts per million (ppm) range, including: ammonia, carbon monoxide , chlorine, chlorine dioxide, hydrogen, hydrogen chloride, hydrogen sulfide, nitric oxide, nitrogen dioxide, oxygen deficiency, and sulfur dioxide
The interface module is microprocessor-based electronic assembly with analog and digital circuitry to process the sensor signal for control, data display and to transmit the signal to a Gas Control Panel or to a PLC. In addition, PT295 Series detector includes a fully programmable form “C” type alarm relay contact that can be used to interface audio / visual alarm devices.
What are the Key Toxic & Oxygen Deficiency Sensor Features
Sensor Type
Electrochemical Cell
Measuring Range
| Ammonia (NH3) | 0-50 ppm |
| Carbon Monoxide (CO) | 0-100, 0-1000 ppm |
| Chlorine (CL2) | 0-10 ppm |
| Chlorine Dioxide (CLO2) | 0-50 ppm |
| Ethylene (C2H4) | 0-100 ppm |
| Ethylene Oxide (C2H4O) | 0-50 ppm |
| Hydrogen Chloride (HCL) | 0-20 ppm |
| Hydrogen Sulfide (H2S) | 0-100, 0-500 ppm |
| Hydrogen (H2) | 0-200 ppm |
| Methyl Mercaptan (CH3SH) | 0-100 ppm |
| Nitrogen Dioxide (NO2) | 0-20 ppm |
| Nitric Oxide (NO) | 0-100 ppm |
| Oxygen Deficiency (O2) | 0-25 %(volume) |
| Sulfur Dioxide (SO2) | 0-100 ppm |
< 5% per year
| CO, H2, H2S, NO2 | T90 < 30 s |
| NO, SO2 | T90 < 15 s |
| NH3 | T90 < 60 s |
| O2 | T90 < 15 s |
Electrical Classifications
Explosion Proof Enclosure
| ATEX: | II 2G Ex d IIC T6 |
| CSA: | Class I, Div 1 & 2, Groups B, C & D C22.2 No 30-M1985 & C22.2 No 142-M1987 |
Approvals
CSA, ABS Type Approved
ATEX / IECEx
EN 60079-1:2014 II 2G db IIC T6 Gb
Operating Temperature Range
H2S, H2, SO2 & CO:
-40°F to +149°F (-40°C to +65°C) (intermittent)
All others:
-30°F to +131°F (-34°C to +55°C)
Humidity Range
5% to 95% RH (non condensing)
Storage Temperature
Electronics Interface Module:
-40°F to +185°F (-40°C to +85°C)
Sensor Head Assembly:
32°F to +68°F (0°C to +20°C) (Cell)
Dimensions
| Height: | 7.4 inches (188 mm) |
| Width: | 6.2 inches (159 mm) |
| Depth: | 4.9 inches (125 mm) |
Ingress Protection
NEMA 4X, IP66
Display and Indicators
3 Digit LED display
Displays Alarm and Fault Status
Power Input
12- 28 VDC (24 VDC Nominal)
Power Consumption
Linear 4-20 mA output
| Fault: | 0 mA |
| Calibrate Mode: | 2 mA |
| Over Range: | > 21 mA |
Three wire shielded cable for power and analog signal.
Max of 300 Ω load for analog output
Dust or Splash guard, Flow Adapter with tube fittings, Sensor Duct Mount Kit, Pole Mount brackets.
3/4" NPT Female Adapter available for 1/2” NPT or M20
Two year Electronics
One year Sensor head assembly (cell)
© 2020 – 2025 Pem-Tech, Inc. 12144 Dairy Ashford, Building 2, Sugar Land, TX 77478 Toll Free: 800-379-3894Phone: 281-494-2079Fax: 281-494-2167
