Calibration
Calibration
4-4 Model 48i Instruction Manual Thermo Electron Corporation
Figure 4-1. Calibration Flow Schematic
Zero Adjust Use the following procedure to set the CO reading to zero.
1. Allow sufficient time for the Model 48i to warm up and stabilize.
2. Adjust the dilution system of Figure 4-1 so that zero air alone is present
in the manifold.
Since not all flow controllers have a positive shut off, it might be
necessary to disconnect the CO input line and cap it.
3. Allow the instrument to sample zero air until a stable reading is
obtained.
4. Press and choose Calibration > Calibrate Zero.
5. In the Calibrate Zero screen, press to set the CO reading to zero.
If a strip chart recorder is used to obtain a record of the analog output, it
is recommended that the system be adjusted to obtain a zero trace at 5%
of scale. This is to allow observation of zero drift and/or zero noise.
Record the stable zero air response as Z.
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