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PT900-12R Gas Monitor
Model PT900-12R Gas Monitor & Controller is a standard 19” rack assembly with up to 12 control modules to serve as a gas monitor and controller for Pem-Tech’s remote mounted gas sensors. The modular designed 12 channel gas monitor is rated Nema 1 for safe area use. The control modules provide digital display, discrete 4-20mA analog output and programmable alarm relay contacts.
The low power RISC based microprocessor allows all the alarm levels and control module address programmed via switches on the front panel. The bright LED display indicates the gas concentration. Also features amber and red LED indicators for alarm status. One of the safety features is a flashing digital display when the control module is in alarm bypass mode. The flashing display is an indication to the personnel in the control room about the alarm bypass status.
Each control module has RS-485 MODBUS RTU serial communication compatible with PLC’s, SCADA, and DCS systems. The module provides complete status like current gas concentration, sensor calibration and current alarm status. The alarm levels can also be accessed and programmed via MODBUS. Please contact us for more information about how Pem-Tech's gas monitors and controllers can fit your specific application.
Gas Monitor & Controller Features
- Addressable Control modules
- Discrete 4-20mA output
- Three (3) Programmable alarm relays
- RS-485 MODBUS RTU Serial Link
- PLC and SCADA Compatibility
- Alarm Status LED Indicators
Specifications
- Electrical Classification
- Nema 1 Panel Mount.
Standard 3U – 19” rack-mount
- Nema 1 Panel Mount.
- Capacity
- 12 Channel / PT900 Series Control
Modules
- 12 Channel / PT900 Series Control
- Front Panel Indicators
- 2 Bright LED digital display
4 each Alarm LED Indicators:
Amber for Low Alarm
Red for High, High-High and fault
Flashing digital display if module in
alarm bypass mode.
- 2 Bright LED digital display
- Test & Safety Features
- Displays programmed alarm levels
with flashing alarm LED indicators
upon unit power up to check system
integrity
- Displays programmed alarm levels
- Operating Temperature
- -40°F to +158°F (-40°C to +70°C)
- Operating Humidity
- 5% to 100% RH, non-condensing
- Mechanical Specifications
- Height: 5 ¼ inches (133 mm)
Width: 19 inches (483 mm)
Depth: 11 inches (279 mm)
- Height: 5 ¼ inches (133 mm)
- Approvals
- Enclosure: CSA & UL
Control Modules: ABS Type approved
ABS Rules: 1-1-4/3.7, 4-8-3/tbl 2
4-8-3/1.7
- Enclosure: CSA & UL
- Power Consumption
- Per channel 160mA @ 24 VDC
including gas
sensor and control module
- Per channel 160mA @ 24 VDC
- Alarm Relays
- Low, High & High-High alarm relays.
Fully programmable zero to full scale
range. Latching or non-latching
- Low, High & High-High alarm relays.
- Relay Ratings
- SPDT Form “C” type Relay contacts
5 Amps @ 250 VAC or 30 VDC
- SPDT Form “C” type Relay contacts
- Auxiliary Alarm Relay Assembly (Optional)
- Four (4) each alarm relay contacts
Each relay rated 10Amps @ 125 VAC /
28 VDC
- Four (4) each alarm relay contacts
- Analog Output
- Discrete 4-20mA (300 Ohms max.
load) 2.0 mA - When sensor in
Calibration mode
< 1.0 mA - Sensor malfunction
- Discrete 4-20mA (300 Ohms max.
- Peripheral & Interface
- RS-485 MODBUS RTU Compatible
with PLC’s, SCADA and DCS
systems. MODBUS registers defined
in the control Module: Gas
concentration, current alarm levels
and alarm status, sensor calibration
mode, Remote alarm Reset and Bypass
Annunciator model PT750 for remote
readout
- RS-485 MODBUS RTU Compatible
For more information about the PT900-12R, please contact Pem-Tech. If this model does not suit your needs, take a look at the other single channel controllers available at Pem-Tech.