Start-Up; Flow Rate Measurement; Liquid Level Measurement - Samson Media 05 Mounting And Operating Instructions

Start-up

5 Start-up
NOTICE
!
Risk of damage to the differential pressure
and flow meter due to impermissible nega-
tive pressure (vacuum) in the measuring
chambers.
A negative pressure in the measuring cham-
bers is not permissible during operation. The
following applies:
Operating pressure ≥ atmospheric pressure
A vacuum in both measuring chambers for a
brief period of time, e.g. to clean tanks, is
permissible.

5.1 Flow rate measurement

For steam measurement
Make sure that the steam does not have di-
rect contact with the measuring diaphragm
of the device. To prevent this, screw off the
differential pressure lines below the shut-off
valves or valve block and fill the device with
water.
Alternatively, make sure the shut-off and
equalizing valves or valve block are shut off
and wait approx. 20 minutes after start up
of the plant (steam in the system) until con-
densate has collected in the differential pres-
sure lines above the valve and up to the ori-
fice plate.
1. Slowly open the high-pressure line.
2. Close the equalizing valve or bypass of
the valve block.
3. Open the low-pressure line.
18
4. Wait a while. Open both vent screws of
the dp cell one after the other until the
escaping condensate is free of bubbles.
Retighten the screws. Vent the compensa-
tion chambers in the same way.
Lightly tap the housing of the indicating
unit or the compensation chambers to
help let the air escape.
5. Check zero (see section 6.1) and put the
device back into operation.
NOTICE
!
When using reverse installation (with the de-
vice mounted above the measuring point),
the differential pressure lines may partly get
drained when depressurizing the system.
When starting up the system again, vent the
measurement setup to allow it to fill with con-
densate.
For liquid measurement
1. Slowly open the high-pressure line.
2. Close the equalizing valve or bypass of
the valve block.
3. Open the low-pressure line.
4. Undo the vent screw on the dp cell until
all the air has escaped. Retighten the
screw.
5. Check zero (see section 6.1) and put the
device back into operation.

5.2 Liquid level measurement

Î Refer to Fig. 4
1. Slowly open the high-pressure line.
EB 9520 EN