Setting Basic Operational Parameters in the Config Menu • 40
If Fast is selected and the gas reading for the sensor(s) being tested is above the
lower tolerance and below the upper tolerance within 10 seconds, the sensor(s) pass
bump testing, the gas application will be stopped, and the test will move on to the
next sensor(s) or to the fresh air purge. If the gas reading on any of the tested
channels is below the lower tolerance or above the upper tolerance within 10
seconds, the gas application will continue for the time period defined by the GAS
bump test parameter, and the pass/fail status of the sensor(s) will be determined at
that point. Turning Fast on allows calibration gas to be saved when the tested
sensors respond quickly and accurately.
Consider the following scenario as an example.
•
50% LEL methane used for bump testing the combustible gas channel
•
GAS bump test parameter set to 20 seconds
•
Tolerance set to ± 50%, which means that the acceptable reading range is 25%
LEL - 75% LEL
•
Fast selected
The table below shows possible readings at 10 seconds and the effect on the gas
application.
Automatic Calibration (Auto Cal.)
Automatic calibration only applies to bump testing. It can be set to On or Off. If it is set
to On, then the docking station will automatically perform a calibration if a bump test
fails.
Alarm Check
If Alarm Check is selected, a vibrator, LED, and buzzer test is done on the GX-6000
at the end of the bump test. The vibrator will vibrate, the LEDs will turn on for a few
seconds, the buzzer will sound, and the SDM-6000 will determine if these actions
were completed successfully.
Table 12: Example Fast Bump Scenarios
Gas Reading 10 Seconds
Into Fast Bump
Outcome
15% LEL (-70% of 50% LEL)
• Gas application continues for the full 20 seconds
• Pass/fail determined at end of 20 seconds
30% LEL (-40% of 50% LEL)
• Gas application stops
• Sensor passes bump testing
60% LEL (+20% of 50% LEL)
• Gas application stops
• Sensor passes bump testing
80% LEL (+60% of 50% LEL)
• Gas application continues for the full 20 seconds
• Pass/fail determined at end of 20 seconds
