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Section 2 Scanner

2000 microEFM

Important If the process uid does not present an environmental risk and is stable when depressur-

ized, it may be used to bleed air from the lines. If the process uid can contaminate the

environment, or is highly volatile when depressurized as with liquied gases, a different

seal uid should be used to ll the legs. An ideal seal uid is one that does not dissolve

in the process uid.

Bleeding with Process Fluid

g. Make sure the shut-off valves in the tubing near the meter pressure taps are closed, and the meter is

lled with process uid.

h. Open the equalizer and bypass/block valves on the block manifold. Make sure the vent valve is

closed.

i. Open one of the shut-off valves near the meter.

j. Slowly loosen the corresponding vent screw on the MVT, and throttle the rate of ow from the vent

with the shut-off valve.

k. When air bubbles are no longer visible around the MVT vent, tighten the MVT vent screw.

l. Repeat steps a through e for the other leg.

Bleeding with a Different Seal Fluid

m. Make sure the shut-off valves in the tubing near the pressure taps are open.

n. Open the equalizer and bypass/block valves on the block manifold. Make sure the vent valve is

closed.

o. Remove the vent screw from one side of the MVT and insert a tting to allow connection of a hand

pump or funnel. If a funnel is used, attach a length of Tygon tubing that is long enough to elevate the

funnel well above the meter pressure taps to force the uid up the legs.

p. Connect a hand pump or funnel to the tting.

q. Estimate the amount of ll uid required to ll the tubing and push any air bubbles into the meter.

r. Pour ll liquid into the funnel, tapping the tubing occasionally to dislodge any bubbles.

s. When the leg is full of uid, remove the tting from the vent of the MVT and quickly replace the vent

screw and tighten.

t. Repeat steps a through g for the other leg.

6. Perform a manifold leak test as described on page 55.

7. Verify the zero offset, if required (and other calibration points, if desired). See the ModWorX™ Pro Soft-

ware User Manual, Part No. 9A-30165025, for complete instructions. See also Zero Offset (Static Pressure

or Differential Pressure), page 56, Static Pressure Calibration and Verication, page 56, and Differential Pres-

sure Calibration and Verication, page 57.

CAUTION Do not put the Scanner into operation until the valves are positioned properly so that

pressure is supplied to both sides of the MVT. For instructions on proper valve positions,

see Placing the Scanner into Operation, page 58.

Cameron Scanner 2000 microEFM User Manual

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