ppbRAE 3000 User’s Guide
•
Press [N/-] to undo the change and move to the next sub-
menu.
Duty Cycle
The pump’s duty cycle is the ratio of its on time to off time. The duty
cycle ranges from 50% to 100% (always on), and the period is 10
seconds. Therefore, a duty cycle of 60% means that the pump is on
for 6 seconds and off for four seconds. Duty cycling is employed by
the instrument to clean the PID. A lower duty cycle has a greater
effect on keeping the PID clean than a higher duty cycle.
Important!
Pump duty cycling is interrupted when the instrument
senses a gas. The pump’s duty cycle is disabled when the
measurement is greater than the 2ppm threshold and is re-enabled
when the reading falls below 90% of the threshold (1.8 ppm).
1.
Press [Y/+] to increase the value.
2.
When you have completed your selection, press [MODE].
•
Press [Y/+] to save the new duty cycle value.
•
Press [N/-] to undo the change and move to the next sub-
menu.
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