ABB MEASUREMENT & ANALYTICS | OPERATING INSTRUCTION | OI/AO2000-LS25-EN REV. E

Pre-aligning the purging flanges Pre-alignment is carried out in three steps: 1. Mount the laser pointer on the transmitter unit purging flange and the focusing screen on the receiver unit purging flange. Perform pre-alignment as described below. 2. Mount the laser pointer on the receiver unit purging flange and the focusing screen on the transmitter unit purging flange. Perform pre-alignment as described below. 3. Re-mount the laser pointer on the transmitter unit purging flange and the focusing screen on the receiver unit purging flange. Perform pre-alignment as described below. • After completion of the pre-alignment, refit the transmitter and receiver units and perform fine-tuning according to Setting the maximum transmission on page 53.

Performing pre-alignment 1. Unscrew the 6 stud screws (item 6 in Figure 38) until the ends of the screws no longer stick out of the holes.   2. Switch on the laser pointer. 3. Align the purging flanges by adjusting the 4 screws (item 5 in Figure 38) until the laser beam hits the center of the focusing screen. 4. Screw in the 4 stud screws until they stop so that the setting is fixed. 5. Switch off the laser pointer. 6. Remove the laser pointer and focusing screen.

Setting the maximum transmission

Fine-tuning of the transmitter and receiver units is performed by measuring the adjustment voltage at the connectors of the signal cable to ensure that a maximum signal (transmission) is achieved. The adjustment voltage varies from 0 V at 0 % transmission to −3V (typically) at 100 % transmission.

As shown in Figure 39, by connecting a voltmeter to the adjustment connector, the adjustment voltage (Lineup+/Lineup−) is measured in the connector housing of the signal cable of the transmitter and receiver units.

ABB ICST08A9

ABB BC810K02

ABB 5SHX1445H0001 3BHL000391P0101 3BHB003230R0101 5SXE05-0152

ABB PPD512 A10-15000 3BHE040375R1023

ABB PM511V08 3BSE011180R1

ABB PPD512A10-150000

ABB REU615E_D

ABB UFC911B108 3BHE037864R0108

ABB IMRIO02

ABB REM610C55HCNN02