3 alarm latching or differential settings, 4 audio defeat, 5 display – ENMET PROAIR 2200 User Manual

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ENMET Corporation

4.3 Alarm Latching or Differential Settings

An instrument is shipped with the alarms in the latching mode. The alarms may be independently configured in the non-
latching mode or differential setting by use of the maintenance menu.

See Section 5.3.3, for setting alarm 1 and alarm 2.

Standard Setting

N THE LATCHING MODE

: at the cessation of the condition which causes an alarm, the alarm indications do not cease, and the

alarm relay contacts do not revert to the non-alarm state, until the

AUDIO DEFEAT

ALARM ACKNOWLEDGE

switch is

pressed. An alarm can also be acknowledged by pressing the switch during the alarm condition; then at the cessation of the
alarm condition, alarm indications cease and alarm relays revert to the non-alarm state. After an alarm is acknowledged,
alarms in the latching configuration are re-armed to latch at the next alarm condition.

N THE NON

LATCHING MODE

at the cessation of the condition that causes an alarm, the alarm indications automatically

cease, and the alarm relay contacts revert to the non-alarm state.

Differential Setting

The Alarm 1 differential value is the delay of the

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staying in alarm condition until after the measured reading

has returned past the alarm point by the differential value.

Example: If the alarm point is

10 and the differential is 2, the

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will go into alarm at 10 and stay in alarm until the reading has dropped below 8.

4.4 Audio Defeat

Pressing the

AUDIO DEFEAT

ALARM ACKNOWLEDGE

switch during an alarm temporarily silences the audio alarm. Relays and

alarm LEDs continue to function, in the alarm state, during an alarm condition. As long as the alarm condition persists, the
audio alarm will “chirp” every 20 seconds.

If after 15 minutes the alarm condition continues the audio alarm will reactivate at full intensity.

If any other alarm condition occurs while the audio alarm has been silenced it will force the audio alarm to reactivate

immediately.

4.5 Display

In clean air a display is shown in

Figure 4

This position of the display is termed the "

operational display". As explained

below, the display can be used to view other information by using the

OPTION

and

SELECT

switches.

Concentrations of CO and CO

are given in PPM (parts per million parts of air). Dew point is given in degrees Fahrenheit at 55

PSIG

;

this can be changed to degrees Centigrade by pressing the

SELECT

switch. Oxygen concentration is given in percent by

volume.

When sample flow is reduced below a limit, the bottom line of the display flashes “Low Flow Alarm”.