GE AKTAprocess, Operating Instructions Manual

Page: 153 / 180

6.6.2 Air trap calibration
Introduction
The air trap contains sensors that control the liquid level within the air trap, see Sec-
tion 3.3.6 Air trap, on page 60. This section includes a function test for the air level sensors,
and two procedures for calibration of the sensors, both automatic and manual.
Air trap level sensor function test
Follow the instruction below to test the air trap level sensors.
Action Step
Empty the air trap from liquid using the Drain instruction (see Air trap valves,
on page 62). 1
Verify that only the green LED indicator (for both the low level sensor and
high level sensor) is activated (displays a steady green light). If the red and/or
yellow LED indicators are also activated, the sensors must be calibrated as
described below. 2
By pumping in liquid using the Fill_Inline instruction for the air trap (see Air
trap valves, on page 62), slowly increase the liquid level in the air trap. Use
the Fill instruction if the air trap doesn’t fill due to a too low flow rate or
pressure. 3
Verify that the low level sensor displays a red light when the liquid level ap-
proaches the sensor. 4
Verify that the low level sensor also displays a yellow light when the liquid
level is within the area of the low level sensor. 5
Verify that the red light of the low level sensor is turned off when the liquid
level is well above the area of the low level sensor. 6
Repeat steps 4 to 6 for the high level sensor. 7
If lights are not displayed as described above, the level sensors must be
calibrated as described below.
Note:
ÄKTAprocess Operating Instructions 29-0252-49 AA 153
6 Maintenance
6.6 Repair and calibration
6.6.2 Air trap calibration