INSTRUMENT MANUAL
VACUUM GAUGE MODEL MM200
160Phone:(215) 947-2500 fax:(215) 947-7464 e-mail:sales@televac.com web site:www.televac.com
MM-200_im REV M
Page 133 of 160
703 CALIBRATION OF VACUUM MEASURING INSTRUMENTS FOR ALTERNATE GASSES
All thermal conductivity gauges, such as thermocouple gauges, are gas dependent. That is, their response
depends on the gas being measured. These gauges are calibrated for nitrogen or air. Their response to other
gasses is shown in Fig. 7.3.
Fig. 7.3 - Actual Pressure -vs- Meter Reading
ACTUAL PRESSURE – VS – METER READING
FOR TYPE 2A & 2C THERMOCOUPLE
GAUGES
ACTUAL PRESSURE – McCLEOD GAUGE (microns Hg.)
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