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Instruction 3015-4286 13
Operation
Front Panel Display and Controls
General Operation
Once the AGMSZ has been installed, set up, and powered ON, the monitor will make measurements in the
area being sampled for ammonia gas without further operator intervention. The results of those
measurements are shown on the front panel display.
In the example shown above, MEASURE indicates that the AGMSZ is actively monitoring for refrigerant
gas, and that currently 45 ppm of R-717 (ammonia gas) is being detected. This display also indicates that a
peak measurement of 485 ppm has been made.
An operator can reset the peak value to zero by pressing the ENTER button.
A log of up to 200 previous measurements can be viewed using the PPM LOG function (Page
15).
If the detected gas level exceeds the preset Leak, Spill, or Evacuate alarm point, then the monitor
responds by turning ON the front panel ALARM (red) light and energizing the corresponding alarm relay.
If the internal audible alarm is turned ON, it too will activate (AUDALRM page
16). Optional external
alarm devices can be connected to the alarm relays to alert personnel that a Leak, Spill, or Evacuate alarm
condition has occurred (Page
10). Pressing the front panel SILENCE button will acknowledge an alarm
and turn OFF all alarm indicators with the exception of the front panel ALARM light. The alarm circuit
will reactivate, however, if the alarm condition is not cleared within the time period set by the SILENCE
function (Page
17). The ALARM light will turn OFF after the detected gas level goes below the lowest
alarm point and after the SILENCE button is pressed.
M
EASURE 00485pk
45
pp
m R717
Display
Screen
ENTER
Press this button to:
1) Clear peak reading
2) Save a function
screen’s displayed value
Keypad
Use these buttons to:
1) Enter function mode and
then move arrow (>) on
screen to the desired function
2) Scroll through data
3) Change a function’s value
MONITOR ON
Light (Green)
1) Flashes
during warm-up
2) Lights steady
during normal
operation
SYSTEM FAULT
Light (Yellow)
Flashes when
any one or more
of the faults
listed on Page
19 occur
ALARM Light
(Red)
Flashes when
the detected gas
level exceeds
any of three
preset alarm
points
SILENCE / QUIT
Press this button to:
1) Acknowledge a
system fault or gas
alarm by turning OFF
the internal audible
alarm and de-energizing
the corresponding
fault/alarm relay
2) Return to the previous
screen without saving
data when in the
function mode