ITABAR-Sensor Type
IBFD
Operating
Manual
8. Measurement
Start-Up
Make sure that:
- all installation openings are closed,
- all installed parts are securely bolted together,
- all shut-off valve are closed,
- all valves of the 3-valve or 5-valve manifold are
closed
Now the pipe can be cleared for the appropriate
medium.
Check all connections, especially the flange gasket.
It takes about 30-60 minutes that the condensation
vessels will filled with condensate.
Now you can open the primary line valves A and B.
To vent the measuring system open valves F and G.
Close the valves when water without air pockets is
to be seen.
ATTENTION!
Take care that for high pressure application the
vent/drain lines are mounted according to the safety
instructions.
Open now the valves for the
∆
p-transmitter (valve C
and D).
Open the valve E for transmitter zero only.
If transmitter zero is O.K. close the valve E. Allow
condensate level to stabilise 1/2 hour before
recording transmitter readings again.
9. Preventive
Maintenance
ITABAR sensors are insensitive to dirt and soil
build-up and therefore nearly maintenance-free.
However, if cleaning is required:
- remove the sensor
- flush
completely
- hand clean with a soft wire brush
10.
Trouble shooting sensors with
condensate pots
If, after the start-up of the ITABAR sensor, any
measuring errors occur, they may possibly be
corrected quite easily:
Error:
No differential pressure indication
Correction:
Check whether all instrument valves to the
∆
p
transmitter are opened.
The valve E must be closed (only for zero).
Check the alignment of the sensor with the pipe. The
arrow on the sensor must point exactly in the flow
direction (downstream).
Error:
Alternating differential pressure
Correction:
Verify that the whole sensor up to the condensation
vessel is insulated.
Remove any insulation from condensation vessels!
NOTE:
Two-Phase flow or alternating phase flow will cause
an erratic spiking signal. The ITABAR sensors are
head-measuring devices and will not accurately
measure two-phase flow.
ITABAR-Flow-Sensors for low pressure steam have
condensate pots in which the condensate water line
is 25mm higher than the flange connection of the
sensor is installed precise horizontal.
That means that water column of static and dynamic
pressure side must have the same high to guarantee
zero differential pressure when steam is not flowing.
The arrangment of higher condensate line than
sensor connection has been done to secure the exact
water column onto the d.p. transmitter.
During steam flow the steam will move into the
condensate pots and will condensate to water. The
water level above line 1 will flow back into the
sensor and change again into steam. The steam
pressure from dynamic and static connection is
pressing onto the water level and the difference ot
these pressures will be transmitted into mA- signal
through the differential pressure transmitter.
Please note that 25mm deviation in the line of 1 will
give 25mm WG differential pressure.
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