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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.
Relieve Pressure or Vacuum
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.
9
Connection Diagrams
8
T-900 Series Pump Operation Manual
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