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Model PT295 LEL Combustible Hydrocarbons
(Catalytic Bead)

Model PT295 Series is a 24 VDC powered gas detector to monitor combustible or Hydrocarbons vapors in air. Detection range is 0-100% LEL (lower explosive limit).

The complete sensor consists of a 316 stainless steel sensor head assembly and an interface module enclosed in a flame proof instrument enclosure. A linear 4-20mA analog signal proportional to 0 to 100% of the detection range is generated by the interface module. Also a digital display and a fully programmable alarm relay is also provided on the interface module.

The detectors feature a simple non-intrusive automated calibration without any manual adjustments. Analog signal and alarm relay are inhibited during calibration mode to avoid any false alarms.

View Data Sheet   Technical Specifications

Catalytic Bead Gas Sensor Applications

  • Drilling Rigs
  • Offshore Platforms
  • Petrochemical Industry
  • Chemical Storage
  • Water & Wastewater Treatment
  • LPG Storage
  • Refineries

Catalytic Bead Gas Sensor Key Features

  • 3-Digit LED display
  • Simple one person auto Calibration
  • Fully programmable alarm relay
  • Linear 4-20mA Output
  • Wide Power input range
  • Reverse Polarity protection
  • Provides complete status & control capability in the control room

Technical Specifications

Sensor Type

Continuous Diffusion Catalytic Bead

Measuring Range

0 to 100 % LEL


± 2 % Full Scale

Zero Drift

< 5% per year

Response Time

T50 < 10 Seconds
T90 < 30 seconds
with 100 % LEL (methane) gas applied

Electrical Classification

Explosion Proof Enclosure

CSA: Class I, Div 1 & 2, Groups B, C & D
C22.2 No 30-M1985 &
C22.2 No 142-M1987


CSA,  ABS Type Approved


EN 60079-1:2014 II 2G db IIC T6 Gb

ANSI / ISA – 12.13.01-2000 Performance Tested

Operating Temperature Range

-40°F to +158°F (-40°C to +70°C)

Humidity Range

5% to 95%  RH (non condensing) 

Storage Temperature

-40°F to +185°F (-40°C to +85°C)


Height: 7.4 inches ( 188 mm)
Width: 6.2 inches (159 mm)
Depth: 4.9 inches (125 mm)

Ingress Protection


Display and Indicators

3 Digit LED display
Displays Alarm and Fault status

Power Input

12- 28 VDC (24 VDC Nominal)

Power Consumption

< 3.5 Watts


Non-Intrusive automated calibration
No manual adjustments required

Typical Sensor Life

5 Years in air

Alarm Relays

Programmable Alarm Relay
  SPDT Form "C" Relays
  5 A @ 250 VAC or 30 VDC

Analog Output

Linear 4-20 mA output

Fault: 0 mA
Calibrate Mode: 2 mA
Over Range: > 21 mA

Input / Output Protection

Transient over voltage suppressor
Reverse Polarity protection
EMI / RFI Immunity

Cable Requirement

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.

Cable Entry

3/4” NPT Female
Adapter available for 1/2” NPT or M20


Two year Electronics
One year Sensor head assembly


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