Apparatus for measuring and displaying leakage rates in a tracer gas leakage detector
A tracer gas leakage detector mainly comprises a primary vacuum pump which is selectably connectable to a unit to be tested for leakage, an inlet valve also connectable to the unit to be tested and communicating with a measurement cell capable of being evacuated by a primary pump and a secondary pump. The inlet valve includes a motor-controlled valve member to enable the aperture through the inlet valve to be servo-controlled to the inlet pressure of the measurement cell, and conversion means providing an electrical signal representative of the aperture. The apparatus for measuring and displaying the leakage flow rate is connected to receive the aperture size representing electrical signal and includes a display system for displaying, as a function of the aperture size representing electrical signal, a valid sub-range of n decades of possible valid measurements taken from a total measuring range of N decades for the apparatus as a whole, thereby warning users that any indicated leakage flow rate values outside the valid sub-range are spurious. The N decades may be marked on a band (22) which is movable relative to a window (24). A pointer (25) is also movable relative to the window. A reading is valid if the pointer lies in the window.
- Assignee:
- Compagnie Industrielle des Telecommunications Cita-Alcatel (France)
- Patent Number(s):
- US 4510792
- OSTI ID:
- 5204870
- Resource Relation:
- Patent Priority Date: Priority date 24 Aug 1983, France; Other Information: PAT-APPL-525902
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LEAK DETECTORS
TRACER TECHNIQUES
COMPUTERS
DISPLAY DEVICES
FLOW RATE
GAS FLOW
PRESSURE GAGES
VACUUM PUMPS
VALVES
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
ISOTOPE APPLICATIONS
LABORATORY EQUIPMENT
MEASURING INSTRUMENTS
PUMPS
440300* - Miscellaneous Instruments- (-1989)