MultiRAE User’s Guide
35
8.3.2.7 Cal. Reference
It is sometimes desirable to calibrate a sensor (PID for VOC, and LEL) with a specific gas for best
response to a gas you are surveying. The Cal. Reference library contains calibration curves for the PID
and LEL sensors for select gases. Choose the sensor, and then select from the list of reference gases.
8.3.2.8 Change Cal. Gas
You can change the calibration gas for the MultiRAE’s PID and LEL sensors. Select from a custom list that you
create (My List), the last ten gases used, the built-in gas library for your PID lamp, and user-defined custom gases.
Each gas is shown in the list for selection and the screen automatically changes to show its full name, chemical
formula, molecular weight (M.W.) and correction factor (CF).
8.3.2.9 Multi Cal Select
This menu allows you to define a group of sensors to be bump tested and span calibrated together.
Simultaneous testing and calibration of multiple sensors shortens the bump test and calibration processes
and reduces the number of individual gas cylinders you need. For example, it may be more efficient to use
a single cylinder with a four-gas mix including 50% LEL Methane, 18% O
2
, 10 ppm H
2
S, and 50 ppm
CO, to calibrate the LEL, O
2
, CO, and H
2
S sensors at one time, compared to using four distinct gas
cylinders and calibrate these sensors individually in sequence. In order for sensors to be calibrated
together, all of them must be selected using Multi Cal. Select.
1. Scroll down the list of sensors using the [N/-] key.
2. Add or remove that gas from the list by pressing [Y/+]. An “X” in a box to the left of a sensor’s
name indicates it is selected.
3. Once you have made all your selections, press [MODE] for “Done.”
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