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It is recommended to use a 2-point calibration using high-range PID sensors. For more
information review TN-114
Note: There could be some cross-sensitivity that may persist due to the use of these gases.
Calibrating A PH
Sensor Using H
S Calibration Gas
3
2
Using a specially designed PH
(Phosphine) sensor in a MultiRAE with firmware version 1.50 or
3
higher, it is possible to calibrate the PH
H sensor using H
S (Hydrogen Sulfide) calibration
3
2
gas. This simplifies both multi- and single-sensor calibration because it allows calibrating both
sensors together, without requiring PH
calibration gas.
3
Note: Two PH
sensors are available, to be able to use H
S gas only P/N: C03-0976-100 can be
3
2
used, if you want to calibrate the PH
sensor you can either use H
S or the 4-mix gas
3
2
containing H
S.
2
If the MultiRAE reads the sensor and finds that it is designed for this H
S/PH
calibration,
2
3
when you view the Multi Cal. Select screen, it shows H
S and PH
selected. Then, if you press
2
3
[N/-] to see the values of the Span gas the MultiRAE expects. Make sure that the gas values on
a 4-mix calibration gas cylinder match the values shown, except for H
S, which should be 10
2
ppm (even though the display shows 16 ppm for PH
). To calibrate multiple sensors, including
3
the specialized PH
H sensor, follow the instructions on section 9.3.1.
3
If the MultiRAE reads the sensor and finds that it is not designed for H
S/PH
calibration,
2
3
when you view the Multi Cal. Select screen, PH
is not selected. When you press [N/-] to
3
advance to the values screen, PH
is not shown.
3
When performing a single-sensor calibration and the instrument is equipped with the
specialized PH
H sensor, the Span Calibration screen shows the target value of the calibration
3
gas and reminds you to apply gas using 10 ppm H
S. Follow the standard process outlined on
2
section 9.3.2
Honeywell MultiRAE Series™
82
User Manual
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