Rae Q-RAE, Руководство по эксплуатации и обслуживанию

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PROGRAMMING
4 - 7
4.4 Calibration of Q-RAE Monitor
CALIBRATION WARNINGS:
The calibration of all newly purchased RAE Systems
instruments should be tested by exposing the sensor(s)
to known concentration calibration gas(es) before the
instrument is put into service.
For maximum safety, the accuracy of the Q-RAE
should be checked by exposing the sensor(s) to known
concentration calibration gas before each day’s use.
In programming mode, the user may re-calibrate the
sensors in the Q-RAE monitor. This is a two-point
calibration process using “fresh air” and the standard
reference gas. First, “fresh air” containing 20.9% oxygen
and no detectable toxic or combustible gases is used to set
the zero point for the LEL, CO and H
2
S sensors and the
span for the O
2
sensor. Then a standard reference gas,
containng a known concentration of a given gas, is used to
set the second point of reference (also known as span gas)
for the first 3 sensors. The two-point calibration procedure
is detailed below. Table 4.3 shows the sub-menus for
calibration operations.
Table 4.3
Calibration Sub-Menu
Fresh Air Calibration?
Multiple Sensor Calibration?
Single Sensor Calibration?
Modify Span Gas Value?
Change LEL Span Gas?