PT295 Series Fixed Gas Sensors

Model PT295 LEL Combustible Hydrocarbons (Infrared)

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.
These infrared combustible gas 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.

Fixed Sensors

PT295 Series Gas Detector

PT395 Series Gas Detector

Ultra1000 Series Gas Detector

What are the Applications of an Infrared Combustible Gas Detector?

What are the Key Features of an Infrared Combustible Gas Detector?

Technical Specifications

Sensor Type

Continuous diffusion / absorption
Non-dispersive Infrared Optical (NDIR)

Measuring Range

0 to 100 % LEL

Repeatability

± 2 % Full Scale

Zero Drift

< 5% per year

Response Time

T50 < 8 Seconds
T90 < 15 seconds

Electrical Classification

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,ATEX / IECEx
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)

Dimensions

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

Ingress Protection

NEMA4X, IP66

Display and Indicators

3 Digit LED display
Displays Alarm and Fault Status

Power Input

12- 28 VDC (24 VDC Nominal)

Power Consumption

< 2 Watts

Calibration

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

Warranty

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

Accessories

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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https://www.pem-tech.com/gas-sensors/toxic-and-oxygen-deficiency/pt295-series-oxygen-sensors.html