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5-1
Chapter 5
Maintenance & Servicing
Introduction
Note
The piston/cylinder assembly is the most critical and sensitive part of the
deadweight tester. To maintain accuracy, the piston must always slide
freely in the cylinder, and the gas supply must remain clean and dry.
The Figures on the following pages detail the components of each assembly,
together with the relevant part numbers. Where “Spec” appears as a part
number, this indicates that this particular component varies with the
specification of the deadweight tester, and is usually associated with other
components in an assembly for replacement purposes.
PCU Assembly — 10 mm Nominal Diameter — Pressure
Piston Disassembly
1. Hold the weight carrier (1), and lift the piston to its full extent. Tap the carrier
sharply down onto the cylinder (2) to release the tapered fit between the piston and
carrier. Remove the weight carrier.
2. Unscrew the PCU assembly from the instrument; use the dowel hole if the cylinder
is tight.
3. Carefully withdraw the piston from the cylinder.
Piston Cleaning
4. Use “non-fluffing”, non-abrasive, lint-free tissue or absorbent cloth. Hold the piston
by the larger “head” end, and rub the tissue back and forth along its length.
5. To remove all traces of contamination, the piston can be cleaned in a suitable solvent.
W Caution
O-ring seals (where fitted) are Nitrile rubber, and should not be
immersed in solvents, as they will become damaged. They
should be wiped carefully with a new tissue.
6. After removal from the solvent, using a NEW tissue, repeat the cleaning procedure in
step 4.
7. Place piston carefully on a NEW tissue where it will not be damaged while the
cylinder is cleaned.
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