KROHNE UFM 800 EN - Manual (Page 7)

Installation and operating instructions UFM 800 W / UFM 800 C 7 12/2000
Procedure for the liquid alignment by using the service adapter board:
1. Align the four sensors physically
2. Connect the sensor cables (1,2, 3 and 4) to the converter as described in item 7
3. Install the service adapter board
4. Connect the power supply
5. Program the converter as described in item 8 (diameter, time window etc.)
6. Select in address 5.2.6. path 1 (i.e. sensors 1 and 2)
7. Measure the DC voltage on AGCL (red) and GROUND (black)
8. Manipulate one sensor of sensor pair 1 for the highest voltage
9. Manipulate the other sensor of sensor pair 1 for the highest voltage
10. Select in address 5.2.6 path 2 (i.e. sensors 3 and 4)
11. Manipulate one sensor of sensor pair 2 for the highest voltage
12. Manipulate the other sensor of sensor pair 2 for the highest voltage
13. Disconnect the service adapter board
4.2 Laser alignment
When fluid alignment is not possible it is possible to align the sensors using a laser-beam. This means that the acoustic windows of the sensors
of each acoustic path will be parallel to each other and on the same axis. It is necessary to have access to the inside of the tube.
Special equipment needed:
● Laser alignment tool (to be ordered separately)
Align the sensor with the laser alignment tool as follows:
● Screw the sensors in the sensor supports until the end. Verify that the sensors are not sticking into the inside diameter of the pipe, else
unscrew until the sensors are flush. Then unscrew each sensor until the acoustic window is facing the opposite sensor of the same path
(Drawing 1/2 SB/DB).
● Fix these sensors on this position with a welding spot.
● Check the alignment once more.
5.0 Welding of the sensors on the sensor support (after alignment with fluid)
Before welding around the sensors completely, remove the inner parts (Drawing 3) from the sensor bodies. Keep the internal parts of each sensor
together in a clean box or plastic bag. Cover the reaming sensor body with a protecting screw to prevent dust and dirt from getting into the sensor
body during welding and grinding. Weld the sensor bodies all around on the sensor support (Drawing 3) and let them cool down before mounting
the internal parts. Due to the welding, the thread of the sensor body can be deformed, by using a thread tap of 20 x 1.5 this can be solved.
Mount the internal parts of the sensors as described in item 6 on the next page.