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6.1 Calibrate with air
Notes:
• Make sure that calibration bag has water inside.
• Make sure that the seal between the calibration bag and the sensor body is tight.
• Make sure that the sensor is dry when it is calibrated.
• Make sure the air pressure/elevation setting is accurate for the calibration location.
• Allow enough time for the sensor temperature to stabilize to the temperature of the calibration bag
location. A large difference in temperature between the process and the calibration location can
take up to 15 minutes to stabilize.
1. Remove the sensor from the process. Use a wet cloth to clean the sensor.
2. Put the entire sensor in a calibration bag with 25-50 mL of water. Make sure that the sensor cap
is not in contact with the water inside the calibration bag and that no water drops are on the
sensor cap (Figure
3. Use a rubber band, tie or hand to create a tight seal around the sensor body.
4. Let the instrument stabilize for 15 minutes before calibration. Keep the calibration bag out of
direct sunlight during stablization.
5. Make sure that the ALT/PRESS setting is set correctly in the sensor settings. Refer to
the sensor on page 10.
6. Go to the calibration menu:
• SC4500 Controller—Select the tile of the device, then select Device menu > Calibration.
• SC200 and SC1000 Controllers—Go to the main menu, then select SENSOR SETUP > [select
instrument] > CALIBRATE.
7. Select Air calibration (or AIR CAL).
8. Select the option for the output signal during calibration:
Option Description
Active The instrument sends the current measured output value during the calibration procedure.
(or ACTIVE)
Hold The sensor output value is held at the current measured value during the calibration
(or HOLD) procedure.
Transfer A preset output value is sent during calibration. Refer to the controller user manual to
(or TRANSFER) change the preset value.
9. Push OK (or enter).
10. Wait for 15 minutes with the sensor in the bag, so the sensor can adjust to the ambient
temperature.
11. When the reading is stable, push OK (or enter).
12. Review the calibration result:
• "Task was succesfully completed." (or "COMPLETE")—The sensor is calibrated and ready
to measure samples. The slope value is shown.
• "The calibration failed." (or "CAL FAIL")—The calibration slope or offset is outside of
accepted limits. Repeat the calibration. Clean the sensor if necessary. Refer to
sensor on page 16.
13. Push OK (or enter).
14. Return the sensor to the process, then push OK (or enter).
The output signal returns to the active state and the measured sample value is shown on the
measure screen.
6).
Configure
Clean the
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