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

Suitable for use in Hazardous Location

Description

Model PT395 Series is a microprocessor-based sensor for the detection of toxic gas in ambient air. 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 proportional 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

 

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 +122°F (-20°C to +50°C)

Operating Humidity

15% to 90% RH, non-condensing

Display

Bright 3 digit LED display

Approvals

CSA / AT

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