Microprocessor based modular design

Industry standard 4-20mA output

LED Status Indicator

12-24 VDC Power input

Reverse polarity protection

Class I, Div 1, Suitable for use in Hazardous Location

Simple Calibration

Description

Model PT205 sensor is designed to detect combustible hydrocarbons vapors in air and provides an analog output signal. PT205 uses catalytic beads sensor to detect combustible vapors in % LEL.

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 low power microprocessor based sensor transmitter provides a 4-20mA analog signal proportional to 0 – 100% of the detection range of the sensor. Also an LED indicator on the transmitter board provides sensor status and fault condition.

Specifications

Sensor Type

Continuous diffusion Catalytic Bead

Measuring Range

0 to 100 % LEL

Accuracy

± 2 % LEL

Zero Drift

< 5% of Full Scale per year

Response Time

T50 < 10 seconds

T90 < 30 seconds with 100% LEL methane gas applied

Classification

Class I, division 1, Groups B,C & D

Operating Temperature

-40°F to +158°F (-40°C to +70°C)

Operating Humidity

10% to 90% RH, non-condensing

Mechanical Specifications

Length: 7 inches (178 mm)

Width: 5 inches (127 mm)

Height: 4 inches (101 mm)

Status Indicators

LED indicator of sensor status and Fault condition.

Approvals

Certified to CSA requirement of use in Hazardous area. Performance test: ISA-S12.13-Part I-1995

Input Power

14-28 VDC. 24 VDC nominal

Power Consumption

110mA @ 24 VDC typical

Analog Output

Linear 4-20mA (300 Ohms max. load)

< 1.0 mA - Sensor malfunction

Cable Requirement

3 wire shielded cable. Max loop resistance of

20 Ohms @ 24 VDC nominal

Cable Entry Hub