Rae UltraRAE 3000, User Manual

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UltraRAE 3000 User’s Guide
25.4.2 Adjusting The Pump Stall Threshold
If the gas inlet is blocked but the pump does not shut down, or the
pump shuts down too easily with a slight blockage, the pump stall
threshold value may be set too high or too low.
Use the following steps to adjust the pump stall threshold:
25.4.3 Pump High
In Diagnostic Mode, press the [MODE] key until “Pump High” is
displayed. The display shows the maximum, minimum, and stall
values for the pump at its high speed. Write down the “Max” reading.
Block the gas inlet and watch the pump current reading (labeled “I”)
increase. Write down its blocked reading.
Note:
If the pump current
reading does not increase significantly (less than 10 counts), then
there may be a leak in the gas inlet or the pump is weak or defective.
Add the two readings you wrote down. This is the average of the
maximum block count and the maximum idle count. Divide that
number by 2. Use the [Y/+] or [N/-] key to increase or decrease the
stall value to equal that number.
Press the [MODE] key to exit this display.
25.4.4 Pump Low
In Diagnostic Mode, press the [MODE] key until “Pump Low” is
displayed. The display shows the maximum, minimum, and stall
values for the pump at its low speed. Write down the “Max” reading.
Block the gas inlet and watch the pump current reading (labeled “I”)
increase. Write down its blocked reading.
Note:
If the pump current
reading does not increase significantly (less than 10 counts), then
there may be a leak in the gas inlet or the pump is weak or defective.
Add the two readings you wrote down. This is the average of the
maximum block count and the maximum idle count. Divide that
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