ENMET ISA-44-RAL-OD - Manual (Page 8)

ENMET Corporation ISA-44RAL-OD / ISA-44RAH-OD
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3.0 Features / Definition of Parts 3.0 Features / Definition of Parts
3.1 Electronics Control Unit
3.1.1 Carbon Monoxide Detection Channel
Refer to Figure 1
F EATURE D ESCRIPTION
POWER LIGHT (G REEN ) Light on: Channel operating
Light off: Alarm condition or power interrupted.
A LARM L IGHTS Visual alarms (steady lights).
AMBER: unit in low level alarm.
RED: unit in high level alarm.
A UDIO A LARM Audio alarm: activates when high alarm level is exceeded.
M ETER A CO concentration meter. The scale is marked in parts per million (ppm) CO.
This is a non-linear device. Do Not Infer Exact Readings From Unmarked
Regions Of The Meter Scale.
O PERATION S WITCH * A rotary switch.
Operate: normal MOS sensor operation
Purge: Purges (cleans) MOS sensor by heating it to very high temperatures.
Sensor inoperative as a CO detector.
Horn Off: Deactivates audio alarm during calibration and maintenance.
C ABLE Oiltight. Connects the sample head assembly to the control unit.
3.1.2 Oxygen Detection Channel
Refer to Figure 1
F EATURE D ESCRIPTION
P OWER L IGHT (G REEN ) Light on: channel operating.
Light off: alarm condition or power interrupted.
A LARM L IGHT (A MBER ) Visual alarm (steady light).
Light on: channel in alarm.
A UDIO A LARM Audio alarm; activates when oxygen channel goes into alarm (amber light).
M ETER Oxygen concentration meter. The scale is marked in % oxygen. The oxygen
meter scale is linear - the points on the meter accurately correspond with the
oxygen concentration in the monitored air
O XYGEN G AIN A DJUST Rotary component which adjusts the meter reading during calibration, testing or
sensor replacement.
O PERATION S WITCH * Same as for CO channel.
C ABLE Same as for CO channel.
* Older equipment has separate PURGE and HORN OFF switches.