ENMET ISA-44-RALE-OD - Manual (Page 10)

ENMET Corporation ISA-44RALE-OD/ISA-44RAHE-OD/ISA-44E-OD
6
2.0 Features of ISA-44RALE-OD / ISA-44E-OD 2.0 Features of ISA-44RALE-OD / ISA-44E-OD
Control Unit: See Figure 1
Feature Description
Control Unit Enclosure Explosion Proof for Class I, Group C,D and Class II Groups E, F, and G atmospheres.
Display Plate Round plate inside control unit enclosure. Houses alarm LEDs, meters and provides
access to gas and oxygen channel circuitry.
Figure 1: Features ISA-44E-OD Control Unit Display Plate
Display
Plate
Control Unit
Enclosure
Power LED
Green
Oxygen Channel
Potentiometers & Test
Points
(See Section 6.2)
Gas Channel
Potentiometers & Test
Points
(See Section 6.1)
Fault LED
Red
Power LED
Green
O XYGEN M ETER
G AS (CO) M ETER
Purge LED
Red
Horn-Off LED
Red
Alarm LED
Red
Low Alarm LED
Amber
High Alarm LED
Red
Horn Off
Purge On
Fault
Test Point
Heater Voltage