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PT920-8SS Series
Features
- Microprocessor based Control modules
- Three (3) Programmable alarm relays
- Eight (8) Sensor / Channel Capacity
- RS-485 MODBUS RTU Serial Communication
- PLC and SCADA Compatibility
- Alarm Status LED Indicators
Description
Model PT920-8SS is a microprocessor-based modular controller that provides up to eight (8) channels of continuous gas detection. The controller is housed in a Nema 4X stainless steel enclosure. Each PT920 Series toxic or combustible gas control module can be interfaced with Pem-Tech’s gas sensors. The control modules provide digital display 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 communication.
Specifications
- Electrical Classification
- Nema 4X Stainless Steel Enclosure with clear viewing window. (Optional Purge kit for pressurized enclosure to be used in hazardous locations)
- Measuring Range
- Up to 8 PT920 Series Control
Modules, toxic or combustibles.
- Up to 8 PT920 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.
Flashing alarm LED indicators upon
unit power up to check the integrity of
display and LED indicators
- 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: 13.5 inches (343 mm)
Width: 12 inches (305 mm)
Depth: 6.5 inches (165 mm)
Weight 10 Lbs. (4.5 Kg)
- Height: 13.5 inches (343 mm)
- Input Power
- 115/230 VAC . Standard
18-28 VDC (Battery backup systems)
- 115/230 VAC . Standard
- 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
- DC Power Consumption Input Power
- 40mA @ 24VDC nominal
90mA max. with alarm active relays.
- 40mA @ 24VDC nominal
- Alarm Relays
- Low, High & High-High alarm relays.
Fully programmable zero to full scale
range. Latching or non-latching,
normally open or normally-closed
contacts.
- 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
- Four (4) each alarm relay contacts
Each relay rated 10Amps @ 125 VAC /
28 VDC
- Four (4) each alarm relay contacts
- 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 on the PT920-8SS Series, contact Pem-Tech today. If you are looking for different features, please take a look at our other single channel controllers.