Ergonomic pneumatic calibration power
A pressure calibration pump comprises a manifold having a port for connection to a reference device and a port for connection to a device to be calibrated. A piston is operated by two handles to pressurize air in the manifold. A pressure adjustment knob is provided to adjust the pressure of air in the manifold and a vent valve, operated by a vent knob is provided to vent air from the manifold. The vent knob is positioned within and concentric with the adjustment knob.
1. A pressure calibration pump comprising: a manifold; a piston arranged to compress air in the manifold; a pressure adjustment knob configured to rotate to adjust the pressure of the air in the manifold by adjusting the volume of the manifold; a Schrader valve; and a vent knob operable to open the Schrader valve to release air from the manifold, wherein the vent knob is positioned entirely inside the adjustment knob, except for an opening to allow operation of the vent knob.
2. A pressure calibration pump according to claim 1 , wherein the vent knob is positioned concentric with the adjustment knob.
3. A pressure calibration pump according to claim 1 wherein the Schrader valve comprises threads and is arranged to vent air from the manifold over the threads.
4. A pressure calibration pump according to claim 1 , further comprising handles arranged to be squeezed together to operate the piston.
5. A pressure calibration pump according to claim 4 wherein the handles comprise cushioned pads.
6. A pressure calibration pump according to claim 1 wherein the manifold has two ports, one of which is for connection to a device to be calibrated and one of which is for connection to a reference device.