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Chapter Four: Operation General
49
Chapter Four: Operation
General
After installation and during periodic maintenance, check the transducer zero (for compound
calibration gauges check the voltage or current reading) to verify proper output. If the output is
incorrect, set the output by adjusting the zero potentiometer. Refer to
How To Check the
Transducer Zero, page 41, for zeroing instructions.
Lowest Suggested Pressure Available for Reading
The pressures listed in the middle column of Table 20 reflect reliable and practical pressures for
different range transducers. Lower readings may be obtained in environments which have stable
temperature and air flow.
Lowest Suggested Pressure to Use for Control
The pressures listed in the last column of Table 20 are for reference, and represent the pressure
reading of the transducer at 50 mV signal output. A DC signal of at least 50 mV is the
recommended minimum signal level to use when integrating any transducer into complex
processing systems.
Suggested Pressures for Reading and Control
Full Scale Range Lowest Suggested Pressure
for Reading
Lowest Suggested Pressure
for Control
10 Torr
5 x 10
-3
Torr 5 x 10
-2
Torr
100 Torr 5 x 10 -2 Torr 5 x 10 -1 Torr
1000 Torr 0.5 Torr 5 Torr
30 psia 3 x 10
-2
psia 3 x 10
-1
psia
100 psia 0.1 psia 1 psia
500 psia 0.5 psia 5 psia
1000 psia 1 psia 10 psia
2000 psia 2 psia 20 psia
3000 psia 3 psia 30 psia
Table 20: Suggested Pressures for Reading and Control