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
Class I, Div 1, Suitable for use in Hazardous Location
Description
Model PT295 is a microprocessor-based sensor for toxic gas detection in parts per million (ppm) level. 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 units modular design allows easy maintenance, troubleshooting, and high reliability.
The unit provides a fully programmable alarm relay and a linear 4-20mA signal proportinoal 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
|
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 |
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 +158°F (-20°C to +70°C)
Operating Humidity
15% to 90% RH, non-condensing
Approval
CSA / ATEX for use in Hazardous Locations
Status Indicators
Three-digit display for gas concentration, Alarm relay status, calibration mode and sensor fault status.
Mechanical Specifications
Length: 7 inches (178 mm)
Width: 5 inches (127 mm)
Height: 4.5 inches (114 mm)
Input Power
14-28 VDC. 24 VDC nominal
Power Consumption
50mA @ 24 VDC nominal
Alarm Relays
Fully programmable. 0 to Full scale range of the sensor. Latching or Non-Latching.
Relay Ratings
SPDT Form “C” type Relay contacts
5 Amps @ 250 VAC or 30 VDC
Analog Output
Linear 4-20mA (300 Ohms max. load)
2.0 mA - Calibration mode
< 1.0 mA - Sensor malfunction
Calibration
Non-Intrusive activated by internal magnetic switch
Cable Requirement
3 conductor shield cable.
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