"Process Instruments and Calibrators"
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Instruction Manual
Description
Baseplate:
The main components of the tester are fixed on a rigid aluminum baseplate. The baseplate is
provided with 4 levelling screws. A sheet metal cover is provided for protecting the interconnecting pipesagainst
damage.
Screw Pump:
The screw pump provides the main pressure generation mechanism of the tester. It consists of
a plunger operating inside a cylinder used to suck the oil into the cylinder from the oil reservoir as well as to
generate the pressure.
H.P. ( High Pressure) Block:
This is the manifold that houses the high pressure piston. Oil from the screw
pump cylinder enters this block and pressurises the high pressure piston. The high pressure block is connected
to the low pressure block also.
L.P.( Low Pressure) Block:
This is the manifold that houses the low pressure piston. Oil from the HP block
flows into the LP block in a simple line circuit.
Main Block:
This is the manifold that connects the screw pump to the tester.
Piston Cylinder Unit ( PCU):
This is mounted on the top face of the low/high pressure block. Oil from the
block flows through the mounting column and the pressure acts below thepiston. A weight carrier is fixed on
the piston to provide a loading surface on which weights are stacked. A weight marked 'carrier' (if supplied)
must also be loaded on the carrier each time before use.
The pistons and weights should be rotated before any readings are taken. Oil pressure generated by the screw
pump acts on the bottom of the free piston, producing a force that pushes the loaded piston vertically upwards.
This force is balanced by dead weights which are marked in pressure units. The piston should be vertical before
use. This is ensured by using leveling screws and placing a spirit level on the weight carrier.
The tester is provided with separate LP and HP PCUs. The LP PCU is direct top loading type, whereas the HP
PCU is provided with a bell for loading weights in an overhang fashion. Both pistons can take the full pressure
of the tester and no separate isolation is required.
