Chapter Four: Operation
General
61
Chapter Four: Operation
General
After installation and during periodic maintenance, check the transducer zero 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 56, for zeroing instructions.
Lowest Suggested Pressure Available for Reading
The pressures listed in the middle column of Table 7 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 7 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
1 Torr
5 x 10
-4
5 X 10
-3
2 Torr
1 x 10
-3
1 x 10
-2
10 Torr
5 x 10
-3
Torr
5 x 10
-2
Torr
100 Torr
5 x 10
-2
Torr
5 x 10
-1
Torr
500 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
Table 11: Suggested Pressures for Reading and Control
