Crystal T-975-CPF Pneumatic Hand Pump - Manual (Page 9)

Operating and Safety Instructions  7
T-900 Series Pump Operation Manual
3 Zero your reference indicator.
4 Close the vent valve.
To apply pressure...
5 Operate the hand pump until the target pressure is nearly reached, but no more than 25 bar (for T-970, T-975, and T-975-CPF) or 1.5 bar (for T-960 and T-965).
6 Turn the fine adjustment valve to reach the target pressure, as indicated on the reference indicator.
Note: After increasing pressure, the reading may drop slightly. This is due to thermodynamic or adiabatic effects , hose expansion, and sealing gaskets.
If pressure does not stabilize, check the measuring circuit for tightness.
Note: Due to the low volume of each compression stroke of the hand pump, only small volume instruments should be tested.
To apply vacuum...
5 Turn the fine adjust valve counter-clockwise to generate a first vacuum.
6 Operate the hand pump smoothly and slowly to reach the target pressure.
Note: After decreasing pressure, the reading may increase slightly. This is due to thermodynamic or adiabatic effects , hose expansion, and sealing gaskets.
If pressure does not stabilize, check the measuring circuit for tightness.
Note: Due to the low volume of each compression stroke of the hand pump, only small volume instruments should be tested.
!
WARNING: Never connect an external pressure supply to the pump.
X Relieve Pressure or Vacuum
ƒ Relieve pressure by carefully opening the vent valve.
!
WARNING: Remove the reference indicator or the device-under-test only once the vent valve is open and no pressure is applied to the hand pump.
Adjustable Stroke
The T-900 Series hand pumps include a stroke adjustment in order to reduce the risk of overpressure. The knurled nut is used to set the lift stop. A shorter
travel will generate less pressure per stroke; a longer travel will generate more pressure per stroke.
Set the lift stop with the knurled nut.