Commissioning
SITRANS FPS200
20
Operating Instructions, 08/2019, A5E46744245-AB
Commissioning
In the scope of commissioning, a zero point adjustment of the pressure transmitter must be provided for in all cases.
At initial commissioning, all valves should be closed when starting up the process. Then the valves of the plus and
minus sides must be opened carefully. The equalizer valve remains closed. Then ensure that effective pressure
lines, valve block and transmitter are completely vented (for liquids and steam) or drained (for gas).
Zero Point adjustment
For zero point adjustment, first close the valve of the minus side and then open the equalizer valve so that both the
minus and the plus sides of the transmitter are subject to the same static pressure. In this condition, the zero-point
adjustment of the differential pressure transmitter can be performed (see transmitter's operating instructions). After
zero-point adjustment, the measuring system is commissioned again in reverse order. Zero-point setting should be
inspected or corrected at regular intervals. The measuring system should also be inspected for complete venting
or drainage at regular intervals.
Venting/Drainage
For 5-fold valve blocks, the additional valves are used for venting or drainage or complete emptying of the
differential pressure lines, e.g. for maintenance work. For steam applications, the valves are used to blow off the
differential pressure lines.
Note!
Complete venting/drainage of the differential pressure transmitter is always performed using the corresponding
devices at the side of the transmitter flanges that lay opposite to the valve block.
Attention!
If all three valves at the valve block are opened simultaneously, the present differential pressure permits a medium
flow through the valve block. This can lead to overheating of the valve block and the differential pressure transmitter
in hot media. Therefore, simultaneous opening of all three valves must be avoided absolutely in operation.