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News:
TNA0928
Date:
07/29/2009
Portable Calibration Kit (M1233SR)
Why Calibrate?
The relationship between oxygen concentration and the electromotive force of a cell is
theoretical. Generally, a sensor shows a slight deviation from the theoretical value
versus the actual value. In this situation, it is necessary to conduct a calibration in order
to ensure that an accurate calibration curve is obtained, and the deviation from the
theoretical cell electromotive force is corrected.
A gas with a know oxygen concentration is used for calibration. In this instance
Yokogawa recommends using a Zero gas of 0.95 to 1.0% oxygen (O2) with a balance
of nitrogen (N2). The recommended Span, or Reference Gas, should be 20.95 to 21%
oxygen with a balance of nitrogen. This can be accomplished using clean dry instrument
air. The M1233SR Portable Calibration Kit provides one 105L bottle of each of these
gases in a convenient carrying case.
How to use the M1233SR Portable Calibration Kit
CAUTION – The contents of the bottled gases are under pressure. Please use caution when
handling the calibration bottles, and installing the pressure regulators.
1. Remove the Cal (1% O
2
) gas bottle from the case.
2. Install the pressure regulator, with the bottle opening facing
away from you or other personnel. Verify that the o-ring on
the regulator is not nicked, cracked or cut prior to installation.
3. Attach the 3/16in clear tubing onto the regulator nipple.
4. Insert the brass ¼ in NPT fitting to the ZR22G “CAL IN” port
on the bottom of the ZR22G gas manifold.
5. Attach the 3/16 clear tubing to the brass ¼ in NPT fitting.
