15 • Setting the Operational Parameters in Edit Mode
The F±10%, F±20%, F±30%, etc. options represent a fast bump tolerance. If one of
these “F” type tolerances 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
TIME bump test parameter, and the pass/fail status of the sensor(s) will be
determined at that point. Using an “F” type tolerance allows calibration gas to be
saved when the sensor respond quickly and accurately.
Consider the following scenario as an example.
•
50% LEL methane used for bump testing the combustible gas channel
•
GAS TIME bump test parameter set to 20 seconds
•
Tolerance set to F±50%, which means that the acceptable reading range is 25%
LEL - 75% LEL
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.
Turning on the SDM-E2 with an EAGLE 2
Do the following to turn on the SDM-E2 and establish a connection with an EAGLE 2:
1. Confirm that the AC Adapter is connected to the SDM-E2 and to an AC wall
socket.
2. Press and hold the SDM-E2’s POWER button. The LEDs will turn amber.
3. When the BUMP
and CAL
LEDs turn off, release the POWER button.
Table 4: 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
