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- Model PT395 - Hydrogen Sulfide Sensor
Model PT395 -Hydrogen Sulfide Sensor
The PT395 hydrogen sulfide sensor is a microprocessor-based sensor designed to detect hydrogen sulfide 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 H2S detector consists of: a stainless steel sensor head assembly, a user connection board and a transmitter board assembly - all electronics are enclosed in an explosion proof instrument box. Sensor modular design allows easy maintenance, troubleshooting and high reliability. Standard features also includes a linear 4-20mA signal output proportional to the full scale detection range and two (2) fully programmable alarm relays and a Fault relay.
The sensor`s transmitter board includes the following: a 3 digit LED display for continuous indication of the gas concentration, along with the calibration mode, alarm and fault status of the sensor. In the normal operating mode the digital display and 4-20mA reading is proportionate to the gas concentration that is detected by the sensor. In the calibration mode the digital display indicates the calibration status, alarm relay outputs are 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.
- 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
- Sensor Type
- Electrochemical Fuel Cell
- Measuring Range
- 0 to 100 parts per million (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 +122°F (-20°C to +50°C)
- Operating Humidity
- 15% to 90% RH, non-condensing
- Mechanical Specifications
- Length: 7 inches (178 mm)
- Width: 5 inches (127 mm)
- Height: 4.5 inches (114 mm)
- Display
- Bright 3 digit LED display
- Status Indicators
- Three-digit display for gas concentration
- Alarm relay status, calibration mode and
- sensor fault status.
- Approvals
- CSA / ATEX for use in Hazardous Locations CSA Standard C22.2 No 30-M1985 & C22.2 No 142-M1987
- Input Power
- 14-28 VDC. 24 VDC nominal
- Power Consumption
- < 2 Watt. Typical 65mA @ 24 VDC
- Alarm Relays
- 3 Alarm Relays, Low, High and Fault Fully programmable. 0 to Full scale Range of the sensor, Latching or Non- Latching
- Relay Ratings
- SPDT Form “C” type Relay contacts 0.5 Amp @ 125 VAC or 2 Amps @ 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 wire shielded cable. Max loop resistance 20 Ohms @ 24 VDC nominal
- Cable Entry Hub
- ¾” NPT Female