Enmet ISA-44-RALE-OD Manual do Utilizador descarregar pdf (Página 19)

ISA-44RALE-OD/ISA-44RAHE-OD/ISA-44E-OD ENMET Corporation

4.3 Operating Alarm Conditions

Any spontaneous alarm on any channel, not triggered by initial warm-up or rough test, should be considered a potentially

serious gas alarm situation. Do not ignore any alarm condition. Take action.

Precautions

♦ Do not blow dense clouds of cigarette smoke on a sensor to trigger an alarm.

♦ Do not squirt pure gases or liquid hydrocarbons, such as butane, propane, gasoline, etc., directly on the sensor element.

♦ Do not use strong cleaning agents, waxes, paints, lacquers, etc., near a sensor. Most of these contain flammable

hydrocarbons that may trigger the alarm.

Normal operating condition:

Condition Signals Indication

Non-alarm operation Green LED's for both gas and oxygen

channels are on.

Unit is operating. Gas content of air is

below the gas channel low alarm point.

Oxygen content is above the oxygen

channel alarm point.

This is the normal operating condition for the ISA-44E-OD instrument. If on the ISA-44RALE-OD air is bubbling

through the sample head assembly humidifier, the signals listed above give positive indication that the unit is operating

and is not in alarm.

Alarm State:

Condition Signals Indication

Power Interruption No LED's are on. Power to the instrument has been

interrupted.

When all the LED's on the display plate are off, the power has been interrupted. The relay contacts are in alarm state, but

will not engage auxiliary equipment unless such equipment is connected to a separate power source which is still

operating.

Oxygen Alarm State:

Condition Signals Indication

Oxygen Deficiency Alarm Oxygen channel green LED is off, red

LED is on, meter shows 19.5% oxygen

by volume or less.

Oxygen channel relay contacts in alarm

state. Horn (optional) is on.

Less than 19.5% oxygen by volume in

the monitored, air.

An oxygen alarm is indicated by the red LED of the oxygen channel on the display plate. This indicates that there is less

than the minimum oxygen requirement of grade D air (19.5% oxygen by volume) in the monitored air. If the oxygen

content of the air subsequently rises above the 19.5% by volume alarm point. The red LED will turn off, the green LED

will come on, and the relays will automatically reset. If the ISA-44RALE-OD/ISA-44E-OD is equipped with a factory

installed audio alarm (horn), it will activate during the oxygen alarm.

WARNING: If the Oxygen Deficiency Alarm signals are on, and the oxygen meter is at bottom scale, it is possible that the

oxygen concentration of the compressor air is low enough to cause serious injury or even quick death. Take

action.

NOTE: Sometimes an oxygen alarm indicates a depleted oxygen cell, an "open" I.S. barrier, or a bad connection. See

sections 7.1 and 7.3 for explanation.

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