Chapter 5
Operation
Precautions
1.Do not over pressure the piston
2.Do not increase or decrease the pressure in the gauge rapidly. Always use a metering valve for flow control. If possible, hold a hand lightly on the weights to protect the piston from injury. The maximum rate is 0.7 MPa (100 psi) per minute.
3.Before operation, be sure the retaining ring of the high pressure piston is securely in place.
4.Do not operate the gauge with a dirty or sticky piston.
5.Do not rotate the pistons against the upper or lower stop longer than necessary because the bearings, of necessity, are not lubricated.
6.Because of extremely small tolerances between mating parts, every effort should be made to insure careful handling of gauge parts. All parts, especially those concerned with the piston and cylinder, should be kept scrupulously clean. Acid from finger prints can etch a piston or cylinder. Handle piston and cylinder using cotton gloves on the hands to prevent acid etching of piston and cylinder walls.
7.Pistons and cylinders are matched assemblies. Each piston will operate properly only in its particular cylinder.
8.Any sound which indicates
9.Always give the serial number of the instrument when ordering replacement parts.
10.The circular
11.The Low Range Piston/Cylinder
See Figure