Assembly Of The Pressure Balance - WIKA CPB3800 Betriebsanleitung

6. Commissioning, operation

6.5 Assembly of the pressure balance

1. Fit the piston unit to the left hand connection. Ensure that the mating faces are clean
and the 12 mm diameter O-ring seal correctly located. Excess force is not required
to achieve an effective seal.
2. Check the level of the system base with the spirit level on the piston-cylinder
unit. Level if necessary by using the levelling screws. If using as a comparator, fit
additional loose union connection (order number 14031251) to port that piston unit
would be fitted to.
3. Fit the appropriate connection to the gauge stand, using a bonded seal to make the
joint and screw a test gauge (for installation use a known gauge) into position, also
with a bonded seal.
If preferred, a copper or leather washer can be substituted for the bonded seal at
the gauge. The loose nut on the pressure balance base enables the gauge to be
positioned as required and for back connection gauges the angle connection is
screwed into the loose union connection.
6.5.1 Filling the base unit with liquid
1. Remove filler plug from reservoir by prising plug out. (This plug should be left out
whilst in use).
2. Open valves A and B.
3. Wind screw pump handle fully clockwise.
4. Fill reservoir with appropriate liquid. Use the oil supplied or an approved substitute
for oil systems. Do not use other liquids. Castor based oils, Skydrol, solvents or
similar liquids will attack the seals fitted in the pressure balance.
5. Wind screw pump handle fully anti-clockwise.
6. Top up reservoir if necessary.
Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
6.5.2 Post assembly test
1. Carry out a test calibration of a known instrument (see chapter 6.6 "Procedure") to
ensure that the unit is working correctly.
WIKA operating instructions model CPB3800
GB
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