| Date: |
2025-05-30 |
| From: |
Lab - none |
| To: |
Lab - none |
| Title: |
Repair |
| Notes: |
Long story - didn't all happened on the 30th. This unit was calibrated on 4/25 and the pressure was a little funky. I tried to put it on the Tonzi Tower on 4/29 but the pressure was reading bad. I brought it back in to test. I took it apart in the lab to check for loose wires but discovered it had a bunch of water in it. Nothing looked corroded though. I let it dry out over the weekend then put it back together to test. The pressure was worse and then it also lost its line lock. I asked Licor how much time/money it would take for them to service it: 6-8weeks and 00! I asked if I could replace the pressure sensor: yes - same one as 7550 boxes: 5. I took it apart again and found the pressure sensor had burned up. I removed the dead pressure sensor and the 7700 worked. I swapped in a 7550 pressure sensor and it was still good. I ordered a new pressure sensor.
I got a new pressure sensor sn PX-5118 and eventually the calibration coefficients for the new sensor: P zero=58.80, span=15.41. On 6/03 I updated the 7700 pressure coefficients and calibrated it. To set the 7700 pressure coefficients choose "About" from the question mark menu and the "factory setup". "Proceed" from warning box then "Watch" the 7700. Finaly use the "Factory..." button to see and change the settings. "Commit" when done.
Additionally I did a small inter-comparison of pressures from the new 7700 sensor, a brand new Campbell BaroVue10 sn 4337/4348 and a new 7550 box sn AIU-2562. With the use of the coefficients for the new sensor the 7700 pressure was right in line with the BaroVue sensor. |
| Entered by: |
Joe Verfaillie |
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