| 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
|
|
Model PT900-12R Gas Monitor
Description
Model PT900-12R 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 ®.
|
Model PT900-12R Gas Monitor
Controller Specifications
|
Electrical Classification
Nema 1 Panel Mount. Standard 3U - 19"
rack-
mount
Capacity
12 Channel / PT900 Series Control
Modules
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: 5 ¼ inches (133
mm)
Width: 19 inches (483 mm)
Depth: 11 inches (279 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
Input Power
14-28 VDC. 24 VDC nominal
|
Power Consumption
Per channel 160mA @ 24 VDC including
gas
sensor and control module
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(Optional)
Four (4) each alarm relay contacts
Each relay rated 10Amps @ 125 VAC / 28 VDC
Analog Output
Discrete 4-20mA (300 Ohms max. load)
2.0 mA - When sensor in Calibration mode
< 1.0 mA - Sensor malfunction
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
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
Warranty
Two years
|
|
