Honeywell MiniRAE 3000+ User Manual page 88

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). 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 low-alarm threshold and is re-
enabled when the reading falls below the low-alarm threshold. The interval range is 10 to 300
seconds, and the default value is 30. It can also be programmed via the Safety Suite Device
Configurator (SSDC) program.
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.
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Press [N/-] to undo the change and move to the next sub-menu.
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Temperature unit
The temperature display can be switched between Fahrenheit and Celsius units.
1. Press [N/-] to step from one option to the next.
2. Press [Y/+] to make your selection (the dark circle in the "radio button" indicates "on").
3. When you have completed your selection, press [MODE].
Press [Y/+] to save the new temperature unit.
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Press [N/-] to undo the change and move to the next sub-menu.
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Pump speed
The pump can operate at two speeds, high and low. Running at low speed is quieter and
conserves a small amount of power. There is almost no difference in sampling accuracy. If
extension tubing is attached, it is recommended to use high speed pump.
1. Press [N/-] to step from one option to the next.
2. Press [Y/+] to make your selection (the dark circle in the "radio button" indicates "on").
3. When you have completed your selection, press [MODE].
Press [Y/+] to save the new temperature unit.
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Press [N/-] to undo the change and move to the next sub-menu.
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Handheld PID Monitors 88 User Manual