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Model PT395 LEL Combustible Hydrocarbons
(Catalytic Bead)

Model PT395 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 stainless steel sensor head assembly and an interface module enclosed in a flame proof instrument enclosure. Interface module generates a 4-20mA signal proportional to 0 to 100% of the de-tection range. Digital display and two (2) fully programmable alarm relays for Low and high gas alarm and a Fault alarm are also provided on the interface module.

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

View Data Sheet   Technical Specifications


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

Key Features

  • 3-Digit LED display
  • Simple one person auto Calibration
  • Three programmable alarm relays
  • 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


ABS Type Approved
ANSI / ISA - 12.13.01-2000 Performance Tested

Operating Temperature Range

-40°F to +158°F (-40°C to +70°C)

Humidity Range

10 - 90% 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
LED status indicators for Alarm and Fault

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 Low and High Alarms, Fault Alarm
  SPDT Form "C" Relays
  2 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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