Emerson Rosemount 245 Інструкція з експлуатації - Сторінка 11
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Instruction Manual
LIQ-MAN-245
1.5.2
In-line calibration against a laboratory measurement
1. Install the sensor in the process piping.
2. Obtain and calibrate a laboratory conductivity meter and sensor capable of measuring the
conductivity of the process liquid.
3. Collect a sample of the process liquid and measure the conductivity using the laboratory
instrument. The temperature of the sample is likely to change during handling. For this
reason, use temperature compensation in both the process and laboratory analyzer. Be
sure the temperature correction algorithms are identical.
4. Refer to the analyzer instruction manual and adjust the analyzer display to match the
conductivity measured in the laboratory.
1.6
Calibration Verification
Calibration verification is a way of monitoring changes that might occur in the external
toroids during service. It does not detect changes in the contact rings. It is not a calibration.
1. Empty and dry the sensor.
2. Attach a resistance decade box to the two yellow wires. See Figure 2-1.
3. Configure the analyzer to measure raw conductivity (no temperature compensation).
4. Adjust the resistance until the analyzer display reads the same number it did during
calibration. Record the resistance value, the displayed value, and the temperature.
Calibration verification can be used to check the toroids while the sensor is in the process line.
1. Drain the process line.
2. Connect a resistance decade box to the yellow wires.
3. Configure the analyzer to measure raw conductivity.
4. Set the decade box to the value noted in step 4 above. The analyzer reading should match
the original reading to within ±20%.
1.7
Wiring
NOTE
For additional wiring information on this product, including sensor combinations not
shown here, please refer to the
Figure1-3 Sensor to Junction Box Wiring
245 Sensor
Liquid Transmitter Wiring
Diagrams.
245 Sensor
June 2017
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