Specifications
SF
6
Portable Monitor
Instruction 3015-5150 11
3.3 Gas Detector Operation
CAUTION: Operate the monitor in its horizontal position (handle facing upwards). Tilting the
monitor to a vertical position while in operation may cause inaccurate measurements to occur.
Turn ON the monitor as follows:
1. Lift up the shield located in front of the handle
2. Press the red power ON/OFF toggle switch.
3. Observe monitor’s firmware version is briefly displayed.
4. Observe that the NEW TWA/twa screen may appear, depending on
the configuration of the monitor’s TWA/twa function (refer to
Section 3.4 for detailed TWA operation).
5. Observe the monitor starts counting down its warm-up period of
300 seconds (5 minutes).
6. At the end of warm up, take the monitor to an area than contains
fresh air and press the ENTER button to fill the monitor’s internal
purge-air bag with clean, fresh air that is of the same temperature
and humidity as the area being monitored for gas. DO NOT fill the
purge-air bag in an area that is contaminated with SF
6
gas.
After the purge-air bag is filled, observe the following as the monitor makes
gas measurements in the area being sampled:
• MEASURE indicates when the monitor is actively measuring the
level of SF
6
gas at the sampling point. The screen to the right shows
that currently 100 ppm is being measured. The measurement cycle
runs for 4 minutes.
A log of up to 200 previous measurements can be viewed using the
PPM LOG function (page 16), or printed as described in 3.16.
The 2ndUNIT value (Blank, Peak PPM, Continuous TWA, or 8 Hr
TWA) is user-selected (refer to 2ndUNIT function on page 17).
• PURGE indicates when the monitor is resetting its infrared detector
to a baseline of 0 ppm using the air contained in the monitor’s
internal purge-air bag. The purge cycle runs for 10 seconds.
The monitor will operate for approximately 40 minutes before the purge-air bag needs refilled.
When the message "PURGE AIR EMPTY" appears, take the monitor to a clean, fresh-air
environment and press the ENTER button to refill the bag.
Work with gas alarms and system faults as follows:
ALARM (red) light turns ON if the detected gas level exceeds a programmed alarm point. An audible
alarm also sounds if the AUDALRM function is activated (page 16) Pressing the front panel
SILENCE button turns OFF the audible alarm, but the ALARM light will continue to flash for as
long as the detected gas level is above the alarm point. The audible alarm will reactivate if the gas-
alarm condition is not cleared within the time period set by the SILENCE function (page 17).
FAULT (yellow) light turns ON if a fault occurs (see Fault Code list on page 19). An audible alarm
also sounds if the AUDALRM function is activated (page 16). Pressing the front panel SILENCE
button turns OFF the audible alarm, but the FAULT light continues to flash for as long as the fault is
present. The audible alarm will reactivate if the fault condition is not cleared within the time period
set by the SILENCE function (page 17). Both the FAULT light and audible alarm will automatically
turn OFF after the cause of the fault has been eliminated. A log of the last 30 fault events can be
viewed using the monitor’s FAULTS function (page
16).
MEASURE 2ndUNIT
100ppm SF6
PURGE 2ndUNIT
100ppm SF6
RECHARGING PURGE
AIR...
PURGE AIR EMPTY
(ENTER) TO FILL
BACHARACH
VERSION x.xx
PRESS ENTER FOR
NEW TWA/twa
PURGE AIR EMPTY
<ENTER> TO FILL
WARM UP
300