Pem - Tech Inc. Gas Detection and Monitoring Systems
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Model PT900-6FG Gas Monitor
 Printable PDF
Features
  • Microprocessor based Addressable modules
  • Three (3) Programmable alarm relays
  • RS-485 MODBUS ® RTU Serial Communication
  • PLC and SCADA Compatibility
  • Alarm Status LED Indicators

Description

Model PT900-6FG is a microprocessor-based modular controller that provides up to six (6) channels of continuous gas detection. The controller is housed in a Nema 4X weatherproof enclosure. Each PT900 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 ®.


Model PT900-6FG Gas Monitor
Specifications

Electrical Classification
Nema 4X Fiberglass Enclosure, Outdoor
weatherproof

Capacity
Up to 6 PT900 Series Control Modules, toxic
or combustibles.

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.

Test & Safety Features
Displays programmed alarm levels and alarm
with flashing alarm LED indicators at unit
power up to check the integrity of display and
LED indicators

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)

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

Warranty
Two years
Input Power
115/230 VAC . Standard
18-28 VDC (Battery backup systems)

Power Consumption
Per channel 40mA @ 24 VDC nominal
90mA maximum with active alarm relays

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.

Relay Ratings
SPDT Form "C" type Relay contacts
5 Amps @ 250 VAC or 30 VDC

Auxiliary Alarm Relay Assembly
Four (4) each alarm relay contacts
Each relay rated 10Amps @ 125 VAC / 28 VDC

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

Cable Connections
10 each cable glands on the bottom of enclosure.
3 wire shielded cable for each sensor
connection to control module. Max loop
resistance of 20 Ohms @ 24 VDC nominal
between the sensor and the Control modules
 
Pem-Tech, Inc.
12144 Dairy Ashford · Bldng 2 · SugarLand , Texas 77478
Phone:   281-494-2079 • Fax:  (281) 494-2167 • Toll Free 1-800-379-3894 • email: sales@pem-tech.com