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ppbRAE 3000 User’s Guide

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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Rae ppbRAE 3000 Specifications

General