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PT295 Series Toxic & Oxygen Sensor

Features

  • Microprocessor based modular design
  • Electrochemical Sensor Technology
  • Industry standard 4-20mA output
  • Field adjustable Alarm level
  • Single point Non-Intrusive calibration
  • Bright 3 digit LED display
  • Displays gas concentration in ppm, calibration prompts and sensor fault codes
  • Class I, Div 1, Suitable for use in Hazardous Location

Description

Model PT295 is a microprocessor-based sensor for toxic gas detection in parts per million (ppm) level. The unit features easy one-man calibration initiated by simply activating a magnetic switch and applying the gas.

The complete sensor consists of a stainless steel sensor head assembly, a user connection board and a transmitter board assembly. All of the sensor electronics are enclosed in an explosion proof instrument box. The unit's modular design allows easy maintenance, troubleshooting, and high reliability.

The unit provides a fully programmable alarm relay and a linear 4-20mA signal proportinoal to 0 to 100% of the detection range of the sensor.

The sensor transmitter board includes a three (3) digit LED display for continuous indication of the gas concentration. The calibration mode, alarm and fault status of the sensor are also indicated on the digital display. In the normal operating mode the digital display and 4-20mA reading is proportional to the gas concentration detected by the sensor. In the calibration mode the digital display indicates the calibration status, alarm relay output is inhibited and analog signal output is set to 2 mA to avoid any false alarm by the control monitor. In the sensor fault mode the transmitter drops the output signal to < 1 mA.

 

Specifications

  • Sensor Type
    • Electrochemical
  • Measuring Ranges
    • Ammonia (NH3) 50 ppm
      Carbon Monoxide (CO) 100 & 1000 ppm
      Chlorine (CL2) 10 ppm
      Chlorine Dioxide (CLO2) 50 ppm
      Ethylene (C2H4) 100 pm
      Ethylene Oxide (C2H4O) 50 ppm
      Hydrogen Chloride (HCL) 20 ppm
      Hydrogen Sulfide (H2S) 100 ppm
      Hydrogen (H2) 100 & 1000 ppm
      Hydrogen Cyanide (HCN) 30 ppm
      Methyl Mercaptan (CH3SH) 100 ppm
      Nitrogen Dioxide (NO2) 20 ppm
      Nitric Oxide (NO) 100 ppm
      Oxygen Deficiency (O2) 25%
      Sulfur Dioxide (SO2) 50 ppm
  • Repeatability
    • ± 2 % Full scale
  • Zero Drift
    • < 5% per year
  • Response Time
    • T90 < 30 seconds with 100% FS gas applied
  • Classification
    • Class I, division 1, Groups B, C & D
  • Operating Temperature
    • -4°F to +158°F (-20°C to +70°C)
  • Operating Humidity
    • 15% to 90% RH, non-condensing
  • Approval
    • CSA / ATEX for use in Hazardous Locations
  • Status Indicators
    • Three-digit display for gas concentration, Alarm relay status, calibration mode and sensor fault status.
  • Mechanical Specifications
    • Length: 7 inches (178 mm)
    • Width: 5 inches (127 mm)
    • Height: 4.5 inches (114 mm)
  • Input Power
    • 14-28 VDC. 24 VDC nominal
  • Power Consumption
    • 50mA @ 24 VDC nominal
  • Alarm Relays
    • Fully programmable. 0 to Full scale range of the sensor. Latching or Non-Latching.
  • Relay Ratings
    • SPDT Form “C” type Relay contacts
    • 5 Amps @ 250 VAC or 30 VDC
  • Analog Output
    • Linear 4-20mA (300 Ohms max. load)
    • 2.0 mA - Calibration mode
    • < 1.0 mA - Sensor malfunction
  • Calibration
    • Non-Intrusive activated by internal magnetic switch
  • Cable Requirement
    • 3 conductor shield cable.

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