| Three high accuracy
capacitance manometer transfer standards are used from 1333Pa down to 1x10-1
Pa. These devices have up to 4 decades of range overlap, providing a high
degree of cross-comparative confidence. Traceability is direct from the
National Vacuum Standard held by SP Technical Research Institute in Sweden
and the highest level of confidence is provided by over twenty years
of
calibration
history
on these standards. Calibration and drift errors are corrected using audited
bespoke linear regression software. These standards are regularly cross-compared
at 1x10-1 Pa with a Spinning Rotor Gauge and at 1333Pa with a 60inch Schwien
manometer producing a vacuum calibration facility with outstandingly low
uncertainties.
A gas friction manometer (Spinning Rotor Gauge) is used for high vacuum
calibrations over the range 1x10-4 Pa to 1x10-1 Pa. Traceability is bought-in
from a German DKD accredited vacuum laboratory providing traceability
to the German National Standards at PTB, Berlin.
Chell has over thirty years' experience in the calibration and repair
of vacuum instrumentation & controllers from all the major manufacturers
and this knowledge ensures that these often most delicate of devices
are handled appropriately.
The generic type of instruments supported include:
- Capacitance manometers
- Pirani & thermocouple gauges
- Cold Cathode & inverted magnetron Ion gauges
- Vacuum transducers & transmitters
- Vacuum switches
- Spinning rotor gauges
- Ion gauges
|
