ENMET ISA-44-RALE-OD - Manual (Page 20)

ENMET Corporation ISA-44RALE-OD/ISA-44RAHE-OD/ISA-44E-OD
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Low-level Gas Alarm State:
Condition Signals Indication
Low level Gas Alarm Gas channel green LED is off, amber
LED is on, meter shows low alarm
concentration of gas or higher.
Gas channel relay contacts in alarm
state. Presence of at least the low alarm
concentration of gas in the monitored
air.
A low-level gas alarm is shown by the amber LED of the gas channel on the display plate. In addition, the meter will
show at least the low-alarm concentration. These signals indicate that there is at least the low-alarm concentration of gas
present in the respiratory airline or in the ambient air. If the gas content of the air subsequently falls below the low alarm
point, the amber LED will turn off, the green LED will turn on, and the low alarm CO channel relay contacts reset.
High-level Gas Alarm State:
Condition Signals Indication
High Gas Alarm Gas channel green LED is off, amber
LED is on, red LED is on, meter shows
high gas alarm concentration or higher.
Gas channel low and high alarm relays
change state.
Horn (optional) is on. Presence of at least the high gas alarm
concentration in the monitored air.
A high-level gas alarm concentration is indicated by simultaneous amber and red alarm LEDs. This indicates that there is
at least the high alarm concentration of gas present in the respiratory air or ambient air. The meter helps to identify the
approximate concentration present. If the gas concentration in the respiratory air falls below the high-level gas alarm
concentration, the red LED turns off, and the high-level gas alarm relay contact automatically reset. However, the amber
LED and relay contacts will remain in alarm position until the gas concentration falls below the low-level gas alarm point.
If the ISA-44RALE-OD/ISA-44E-OD is equipped with a horn, it will activate during the high gas alarm.
W ARNING : If High Gas Alarm signals activate, and the meter indicates a full-scale reading, it is possible that the gas content is
high enough to cause serious injury or even death. Take action.
Combination Alarm State:
Condition Signals Indication
Combination Alarm See below See below
A combination alarm is an oxygen alarm together with either a low or high gas alarm. Signals for both alarms will be on.
Indicates both oxygen and carbon monoxide hazards.
Sensor Fault Alarm State:
Condition Signals Indication
Sensor Fault Red LED on gas channel is on.
Horn (optional) is on.
High relays change state.
Problems with MOS sensor.
A sensor fault alarm indicates a problem with the MOS sensor or circuitry. The sensor heater voltage must be checked
(section 6.1 or section 7.5). Never use the ISA-44RALE-OD/ISA-44E-OD if the sensor fault alarm is on.