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Model PT920 Eight (8) Channels

Fiberglass, Stainless Steel or Explosion Proof Enclosures

Model PT920-8 Series is a modular designed Monitor-Controller that provides up to eight (8) channels of continuous gas detection. Control modules in a card cage assembly are front accessible with independent alarm status LED indicators, alarm Reset and Acknowledge switches. Modules interface to PemTech's toxic and combustible gas sensors & transmitters. Additionally each module has two digit LED display and 3 levels of independent alarm levels. Alarm levels are fully programmable via switches on the front panel. 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. An RS-485 serial communication port for the interface to Mimic or Repeater panel or to a client PLC or DCS system.

View Data Sheet   Technical Specifications


  • Oil & Gas Drilling Rigs
  • Offshore Platforms
  • Petrochemical Industry
  • Chemical Storage
  • Water & Wastewater Treatment
  • LPG Storage
  • Refineries

Key Features

  • Single Channel Modular Design
  • Accepts inputs from up to Eight 4-20mA Sensor & Transmitter
  • 120/220 VAC to 24 VDC Power Supply
  • Three levels of alarms
  • Relay Acknowledge feature to silence external audible alarm devices
  • RS-485 Serial Communication for Mimic or Repeater Panel
  • Available in Stainless steel, Fiberglass and Explosion proof enclosure


Channels / Inputs

Up to 8 Analog Input
(4-20mA DetectorsTransmitters)

Power Input

120/220 VAC 50 Watt Power Supply
24 VDC

Power Consumption

Per Control Module
40mA @ 24VDC nominal
90mA max. with alarm active relays.
(power consumption of detectors not included)

Discrete Alarm Relays

3 Levels of alarm (Low, High & High-High)
1 Sensor Fault
SPDT Form "C" type Relay contacts
5Amps @ 250 VAC or 30 VDC

Common Alarm Relays

Four (4) each alarm relay contacts
Each relay rated 10Amps @ 250VAC / 28 VDC

Display & Indicators

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.

Operating Temperature

-40 °F to +158 °F (-40 °C to +70 °C)

Serial Port Peripherals & 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


Mimic or Repeater Panel
Purge kit for pressurized enclosure to be used in hazardous locations (Stainless Steel Enclosures only)

Approved Enclosure Options

  • Nema 4X, Fiberglass, IP 66 Wallmount
  • Nema 4X, Stainless Steel, IP66 Wallmount
  • Nema 7, Explosion Proof Wallmount, CSA, UL