Maintenance and Replacement 18
Type T Hydraulic Deadweight Tester Operation Manual
THE OPTIONAL ISOLATING MEMBRANE
An optional isolating membrane is available for installation on all deadweight tester models. The isolating membrane:
•
Isolates harmful dirt particles, originating in the system being calibrated and/or the pump, from the piston cylinder.
•
Allows the use of MGAAA instrument oil in contact with the piston-cylinder assembly which will reduce the rate of uid leakage through that assembly. This
reduces the frequency of the pumping required to maintain the piston in the referenced calibration plane.
!
CAUTION: Use only MGAAA oil provided by M&G for the isolating membrane. The AAA designation means that it is triple ltered for suspended solids.
!
CAUTION: Do not allow the parts exposed in the following steps to come into contact with dirt, debris, or ne particles of any kind.
X
To Install the Isolating Membrane
Once the piston and cylinder assembly has been removed, the optional isolating membrane may be installed.
1 Remove the piston and cylinder assembly.
See To Remove the Piston and Cylinder Assembly on page 15.
2
Remove the piston from the c
ylinder.
3
Remove the o-ring fr
om the cylinder and set it aside.
4
Install the isolating membrane on the cylinder.
Remove the cylinder o-ring… then install the isolating membrane.
5 Carefully insert the cylinder, with the membrane attached, into the column body.
Note: MGAAA instrument oil and a plastic ll bottle are necessary to complete this procedure. Both the oil and bottle may be ordered from AMETEK.
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