Applying lubricant to flow meter cell
If the warning Fine tuning flow meter failed is displayed in UNICORN, there
may be insufficient lubricant between the flow meter cell and the transducers. Follow
the instruction below to apply new lubricant.
It is safe to allow the ongoing run to finish before relubricating. Impact on flow
measurements will be limited, with a maximum error less than 1%.
Note:
ActionStep
Pause the system and remove the transducers.1
Wipe the transducer contact surfaces clean and apply a new layer of
Vaseline on the surfaces.
2
Reconnect the transducers.3
Calibrating pressure sensors
If the readings from the pressure sensors deviate by more than ±0.20 bar at any pressure,
after autozero at atmospheric pressure, the sensors need to be calibrated. Calibration
requires a special pressure calibration cell (article 28-9329-42 in Section 14.4 Ordering
information, on page 210) and a suitable pump. The recommended pump is DPI 603 from
GE Sensing.
Calibration is best performed with no flow kit mounted. Calibration includes the following
steps:
ActionStep
Mount the calibration cell on pressure
meter PT-111 (figure shows calibra-
tion cell with pump tubing removed).
1
Cycle the pressure cell a few times up
to 5 bar until the reading at atmo-
spheric pressure is stable. In the
ÄKTA ready System Control module,
on the System menu, click Calibrate.
2
In the the Calibrate dialog box , select Monitor PT111. Make sure that Refer-
ence value 1 is set to 0.0000 and that the cell is at atmospheric pressure
(open the vent valve on the pump). Click Read value 1.
3
Close the venting valve on the pump and pump up to a pressure of 5 bar.
Make sure that Reference value 2 is set to 5.0000 bar, and click Read value
2.
4
188 ÄKTA ready Operating Instructions 28960345 AD
12 Maintenance
12.2 Yearly maintenance
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