Specifications

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3BUS 208 000 R1301148 Measurement Setup
Air Temperature Compensation for Basis
Weight (TLK-5/-8/-9 ONLY)
Air Temperature Compensation (ATC) corrects the basis weight measurement for
changes in air density due to temperature changes in the measurement column. ATC
measures the temperature at clean window standardize and then corrects the basis
weight measurement for deviations from the last clean standardize value at each
measurement.
Note: ATC should not operate while using the air gap conditioner (AGC).
Tune ATC with AGC turned off.
The temperature measurement is the weighted sum of four signals derived from
thermistors in four locations: Source head, Detector head, Air gap above the sheet,
Air gap below the sheet.
Tuning ATC involves:
• Verifying the measurement stability of the beta sensor
• Tuning ATC based upon its response to an artificially induced temperature
gradient
Verification of Setup and Stability
1. Access the inspect utility at the Service Workstation.
2. At the I> prompt type:
BetaSensor01->tempCompFlagExists=1
3. Save the change using the gstore utility.
4. Restart the system to complete the enabling process.
5. Use the Basis Weight Health Report to check the default values for
temperatureCoefficients coldstart file and compare them to the values in
Table 6-28 for your specific sensor type. Update the coefficient array if it does
not match the values in the table. The default for dBWdT is shown in the table.
If it is different from that reported on the Health Report, then a previous
adjustment has been made. Do not change it at this time.