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RAE ppbRAE 3000 User's Guide - Geotech

RAE ppbRAE 3000 User's Guide - Geotech

ppbRAE

ppbRAE 3000 User’s Guide• Press [N/-] to undo the change and move to the next submenu.Duty CycleThe pump’s duty cycle is the ratio of its on time to off time. The dutycycle ranges from 50% to 100% (always on), and the period is 10seconds. Therefore, a duty cycle of 60% means that the pump is onfor 6 seconds and off for four seconds. Duty cycling is employed bythe instrument to clean the PID. A lower duty cycle has a greatereffect on keeping the PID clean than a higher duty cycle.Important! Pump duty cycling is interrupted when the instrumentsenses a gas. The pump’s duty cycle is disabled when themeasurement is greater than the 2ppm threshold and is re-enabledwhen 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 submenu.70

ppbRAE 3000 User’s GuideTemperature UnitThe temperature display can be switched between Fahrenheit andCelsius units.1. Press [N/-] to step from one option to the next.2. Press [Y/+] to make your selection (the dark circle in the “radiobutton” indicates “on”).3. When you have completed your selection, press [MODE].• Press [Y/+] to save the new temperature unit.• Press [N/-] to undo the change and move to the next submenu.Pump SpeedThe pump can operate at two speeds, high and low. Running at lowspeed is quieter and conserves a small amount of power. There isalmost no difference in sampling accuracy.1. Press [N/-] to step from one option to the next.2. Press [Y/+] to make your selection (the dark circle in the “radiobutton” indicates “on”).3. When you have completed your selection, press [MODE].• Press [Y/+] to save the new temperature unit.• Press [N/-] to undo the change and move to the next submenu.71

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