materials. It can be used with non-flammable, non-hazardous liquids
up to 5 centipoise viscosity, but field calibration is recommended for
accurate measurements.
It is important to note that most process water contains dissolved
minerals. If the flowsensor is repeatedly exposed to process water and
then the line is allowed to dry, these dissolved minerals will deposit
onto the FP7002 and will inhibit the low flowrate operation of the
sensor. If this occurs, cleaning of the sensor is recommended.
CAUTION
WATER HAMMER AND SURGES CAN BE DAMAGING TO
ANY FLOWMETER AND MUST ALWAYS BE AVOIDED.
WATER HAMMER OCCURS WHEN A LIQUID FLOW IS
SUDDENLY STOPPED AS WITH QUICK CLOSING AND
SOLENOID OPERATED VALVES. SURGES OCCUR WHEN
FLOW IS SUDDENLY BEGUN, AS WHEN A PUMP IS
TURNED ON AT FULL POWER OR A VALVE IS QUICKLY
OPENED.
LIQUID SURGES ARE PARTICULARLY DAMAGING TO
FLOWMETERS IF THE PIPE IS ORIGINALLY EMPTY. TO
AVOID DAMAGING SURGES, FLUID LINES SHOULD
REMAIN FULL (IF POSSIBLE) AND PUMPS SHOULD
BE BROUGHT UP TO POWER AND VALVES OPENED
SLOWLY. IN ADDITION, TO AVOID BOTH WATER
HAMMER AND SURGES, A SURGE CHAMBER SHOULD
BE INSTALLED.
2.3 Flowmeter Installation
The FP7002 can be mounted in vertical or horizontal pipe runs;
however, the pipe must be full of liquid for proper readings. Thus, the
sensor should not be mounted in vertical pipe where the liquid flows
down, since the pipe may not always be full in this situation. Refer to
Figures 2-1 and 2-2.
FP7002/FP7002A Flow/Temperature Transmitter
2
2
