Single Zone Gas Monitor
22
P/N: 3015-4256 Rev 13
SQUELCH
– Sets a value of between 0.0 and 99.9 ppm that prevents
the display of measurements below that value. Factory default is 0 ppm.
For example, if the squelch setting is set to 50 ppm, then the monitor will
not display measurements that are below that value. Use the
Keypad
to
enter the desired value, and then press
ENTER
to save that value and
return to the previous screen.
ZONETEMP
– Used to enter the temperature of the area being
monitored in °C, thus giving a more accurate ppm reading. The factory
default is 25°C. Use the
Keypad
to enter the desired temperature, and
then press
ENTER
to save that value and return to the previous screen.
CAL
– Used to change the monitor’s calibration factor. This function is
to be used ONLY with instructions from a Bacharach Service Center.
Factory default is 1.000.
P-CHK
– This
Pressure Check
function displays the current manifold
pressure and the stored ambient pressure in psia, along with the
difference between these two pressures and the current fault code.
3.4. Gas Alarms
3.4.1. Overview
If the selected gas ppm level in the area being monitored exceeds its preset Leak, Spill, or Evacuate
Alarm level (page 22), the SZ unit will detect this alarm condition and turn ON the front panel
ALARM
light. Additionally, an external alarm device may activate and the monitor’s internal audible alarm may
sound if those features have been enabled (pages 14 and 22).
3.4.2. Clearing / Silencing a Gas Alarm
Once the gas-alarm circuit has been triggered all alarm indicators remain turned ON, even after the
detected gas level returns to normal. Press the
SILENCE
button to clear all gas-alarm indicators after the
cause of the alarm has been cleared and the detected gas level has dropped below all alarm levels.
Pressing the
SILENCE
button while a gas-alarm condition still exists causes the internal audible alarm
and all external alarm devices that are connected to the relays to turn OFF for a period of time as set by
the
SILENCE
function (page 22). This will allow ventilation equipment tied to the SPILL and EVAC relays
to continue operating. The front panel
ALARM
light remains ON, however, as an indication that an alarm
condition still exists, but will automatically turn OFF once the gas level returns to normal. The alarm circuit
will reactivate at the end of the silence period if the detected gas level is still above an alarm level.
3.4.3. Viewing the Gas Alarm Log
From the
Data Display
screen, use the
Keypad
buttons to place the arrow (>) on the display next to the
ALARMS
function. Then press
ENTER
to display the alarm log.
The alarm log shows the type of alarm (LEAK, SPILL, or EVAC), plus the date and time it occurred. If
CLEAR is displayed, this indicates that an alarm was acknowledged at the date and time shown.
Immediately after selecting the
ALARM
function, the most recent alarm event is displayed. In the example
below, record #03 shows that a Spill Alarm occurred on 11/10/10 at 15:06. Note that if more than
30 alarm events have occurred, then the newest event overwrites the oldest. The Alarm Log can be
cleared as described on page 25.
#03 SPILL @
11/10/10 15:06
14.72 * AMB14.81
0.0
R134A CALFACTOR
1.000
TEMP AT ZONE =
25 degC
SQUELCH BELOW
50.0ppm
