Wika CPB3800 Manual de usuario descargar pdf (Pagina 29)

WIKA operating instructions model CPB3800

14062232.03 12/2013 GB/D

6. Commissioning, operation

2. Load the weights equivalent to the desired pressure. Each weight is marked with its

pressure value. The piston-cylinder unit has a basic lb/in² start, for other pressure

units a make-up weight is added to the piston head for conversion to bar.

For calibrating pressures less than the pressure value of the overhang

make-up weight value, it is recommended that the top loading weights

are used for calibration. When the required pressure calibration unit is

bar, it is essential that the small make-up weight is tted rst before any

other top loading weights.

For calibrating pressures greater than the pressure value overhang

make-up weight value, the overhang should be tted. All top loading

weights must be removed before tting the overhang.

When the overhang is tted, the initial weight that goes onto it is a large

annular make-up weight. The small type make-up weight should not be

used when the overhang is tted.

6.6.1 To apply pressure

For pressures up to 140 bar (2,000lb/in²)

1. Close valve B (valve A remaining open).

2. Wind spindle pump handle clockwise. This will generate pressure up to approxi-

mately 140 bar or 2,000 lb/in², as handle is wound in. When handle becomes sti to

rotate this will indicate that the pressure limit for this range has been reached.

For pressures above 140 bar (2,000lb/in²)

1. Ensure valve B closed and valve A open.

2. Wind spindle pump handle clockwise until the handle becomes sti to operate.

3. Close Valve A and open valve B.

4. Continue to wind spindle pump handle clockwise. This will generate pressure up to

approximately 1,200 bar or 16,000 lb/in².

5. When the piston rises and appears to oats, this indicates it is at its nominal desired

pressure. When only top loading weights are being utilised, a blue and yellow band

indicates the oat position. When the overhang is being employed, the bottom of

the overhang will line up with a machined groove in the piston holders main body, to

indicate its nominal desired pressure.

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Wika CPB3800 Manual de usuario Pagina 29