Product Manual

Honeywell BW Solo User Manual
32
10. Zeroing
Because usage environments vary, there are many factors that may affect the performance of the
gas detector, including temperature and humidity changes as well as dust. If the ambient air is not
clean, gas readings might be inaccurate. For optimal performance, zero the gas detector once
every 24 hours or after changing of environmental conditions.
1. From the main reading screen, click the button twice in rapid succession to enter the menus.
2. Click the button until you see Zero.
Note: If this is a CO unit, "Apply N2?" will be displayed and you will have to apply nitrogen as
the zero gas before continuing with the zero process.
3. Press and hold the button down for [verify this time, it is more than 1 sec] second. The
instrument counts down and then performs a zero calibration.
4. A progress bar indicates that the instrument is being zeroed.
• If the instrument passes zeroing, the message “Passed” appears.
• If the instrument fails zeroing, the message “Failed” appears.
If the instrument passed the zero calibration, it automatically reverts to the main reading screen
after 10 seconds.
Note: A CO
2
sensor cannot be zeroed in fresh air. It can only be zeroed in a zero gas such as N
2
.
11. Bump Testing
1. From the main reading screen, click the button twice in rapid succession to enter the menus.
2. Click the button until you see Bump.
3. Press and hold the button down for 3 seconds. The instrument counts down and then
performs an AVV (audible, visible, vibration alarm) test, where it turns on three groups of red
LEDs, green LEDs, the buzzer, and vibration alarm, one at a time. The user can choose to
pass or fail after the test.
4. Press and hold the button to acknowledge the results. You should see “Apply Gas?”
5. Press the button to initiate the test.
IMPORTANT! BUMP TEST THE MONITOR BEFORE EACH DAY’S USE
Prior to each day’s use, every gas detection monitor should be bump tested to confirm the response of all
sensors and activation of all alarms by exposing the monitor to a concentration of target gas that exceeds
the low alarm set point. A bump test is also recommended if the monitor has been subjected to physical
impact, liquid immersion, an Over Limit alarm event, or custody changes, or anytime the monitor’s
performance is in doubt.
To ensure greatest accuracy and safety, only bump test and calibrate in a fresh air environment.
The monitor should be calibrated every time it does not pass a bump test, but no less frequently than
every six months, depending on use and exposure to gas and contamination, and its operational mode.
• Calibration intervals and bump test procedures may vary due to national legislation.
• Honeywell recommends using calibration gas cylinders containing the gas that is appropriate to the
sensor you are using, and in the correct concentration.