Installing/connecting
SITRANS FPS200
Operating Instructions, 08/2019, A5E46744245-AB
15
Assembling in horizontal pipes
•
For flow rate measurement in gases, the differential pressure transmitter should be installed above the
center-line of the pipe at all times. An upwards vertical installation is preferred.
•
For flow rate measurement in liquids, the differential pressure transmitter should be installed below the
center-line of the pipe at all times. A downwards vertical installation is preferred.
•
For flow rate measurement in steam, the differential pressure transmitter should be installed within the
center-line of the pipe at all times. The differential pressure transmitter has to be mounted below the
connection of the differential pressure.
Assembling in vertical pipes
The differential pressure connections are always mounted horizontally. In case the equipment for direct assembling
is tilted, the transmitter has to be installed.
•
Above the connections of the differential pressure (for gases).
•
Below the connections of the differential pressure (for liquids and steam).
5.6.2
Installation position and piping for measurement in liquids
For flow rate measurement in liquids, the primary element should be installed that the pressure tapping nozzles in
horizontal pipes is allocated below the horizontal central-line of the pipe. Independent of the piping (horizontal or
vertical) the primary element (not always part of delivery) should be installed below the pipe at all times. The
differential pressure pipes have to be strictly monotonic decreasing from the primary element to the differential
pressure transmitter. The decline should indicate at least 4°. If the differential pressure pipe is accurately
dimensioned it is guaranteed that no air pockets falsify the measurement in those pipes.
For measurements with solids shares, such as contaminated liquids, installation of separators and discharge valves
is sensible to catch and remove deposits.
For flow measurement in vertical pipes, a de-aeration is absolutely necessary before initial operation especially at
assembly position with a downwards flow to avoid partial filling of the pipe during the measurement.
5.6.3
Installation position and piping for measurement in gases
For flow rate measurement in gases, the primary element should be installed that the pressure tapping nozzles in
horizontal pipes is allocated above the horizontal central-line of the pipe. Independent of the piping (horizontal or
vertical) the primary element (not always part of delivery) should be installed above the pipe at all times. The
differential pressure pipes have to be strictly monotonic increasing from the primary element to the differential
pressure transmitter. The incline should indicate at least 4°. If the differential pressure pipe is accurately
dimensioned it is guaranteed that no enclosed humidity falsify the measurement in those pipes.