ppbRAE 3000 User’s Guide
33
Preset Alarm Limits & Calibration
The instrument is factory calibrated with standard calibration gas, and
is programmed with default alarm limits.
Testing The Alarm
You can test the alarm whenever the main (Reading) display is
shown. Press [Y/+], and the audible and visible alarms are tested.
Integrated Sampling Pump
The instrument includes an integrated sampling pump. This
diaphragm-type pump that provides a 450 to 550 cc per minute flow
rate. Connecting a Teflon or metal tubing with 1/8" inside diameter to
the gas inlet port of the instrument, this pump can pull in air samples
from 100' (30 m) horizontally or vertically.
Note: In Search Mode, the pump turns on when a sample
measurement is started, and turns off when the sample is manually
stopped.
If liquid or other objects are pulled into the inlet port filter, the
instrument detects the obstruction and immediately shuts down the
pump. The alarm is activated and a flashing pump icon is displayed.
You should acknowledge the pump shutoff condition by clearing the
obstruction and pressing the [Y/+] key while in the main reading
display to restart the pump.
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