Rosemount 2120, Справочное руководство

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Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120
3-6
Calibration Sequence
To calibrate the cassette, do the following:
1. Ensure that the sensor forks are dry and the mode switch is set to Wet = On,
time delay 1 second.
2. Check that the LED is flashing at one flash per second. If it is on continuously,
proceed to step 8.
3. Apply magnet to test point. With the housing conduit nearest to you, the test point can be
found halfway down the housing on the right hand side in line with the PCB cassette. On
the external housings, a target indicates this. (see page 3-1).
4. After a one second delay, the LED will light continuously.
5. Within three seconds rotate the Mode switch two steps clockwise.
6. After a two second delay, the LED will go out.
7. Within three seconds, rotate the Mode switch two steps anti-clockwise.
Proceed to step 13.
8. Apply magnet to test point, indicated by a target on external label (see page 3-1).
9. After a one second delay, the LED will flash at one flash per second.
10. Within three seconds, rotate the Mode switch two steps clockwise.
11. After a two second delay, the LED will go out (stop flashing).
12. Within three seconds, rotate the Mode switch two steps anti-clockwise.
13. After a two second delay, the LED should flash twice per second.
14. If the LED is flashing twice per second, the calibration has occurred correctly.
Remove the magnet. After a one second delay, the unit will return to normal operation.
Proceed to step 17.
15. If the LED is flashing once per second or it is on continuously, the calibration has failed. If
this occurs, remove the magnet, wait ten seconds and then repeat from step 2 onwards.
16. If the LED stays off after the two second delay of step 13, the sensor is not working
correctly. Check that the sensor forks are clean and dry. Also, check that there is nothing
jammed in or touching the sensor. If no fault is found with the sensor, the entire unit
should be returned for repair.
17. Set the Mode switch to the original setting noted in step 2 of the Replacement Sequence.
Wait five seconds for the new setting to be acted upon.
18. Replace the lid and check the system works.