HIGHLY SENSITIVE CAPACITIVE PRESSURE GAUGE

Two capacitive pressure gauges which have been used extensively in the study of liquid and solid helium are described. The first gauge, constructed of Be single bond Cu, has a sensitivity of Δp∼2×10-6 atm for pressures of 100 atm. It is highly stable, has essentially no hysteresis, and is affected very little by changes in temperature below 4.2 K. The second gauge is of nylon construction and is suitable for NMR or with paramagnetic salt thermometry. A detailed description of the construction and use of both gauges is given. © 1969 The American Institute of Physics.