Chapter Four: Operation
How to Configure the 270 Instrument
39
12. Position the
RANGE SELECT
switch in the x0.01 position.
Refer to your sensor’s Instruction Manual for the proper pressure to set the zero. If you
are using a differential sensor, crossport the unit.
13. Check the zero reading and adjust if necessary.
If you are using the 270 with a single pressure sensor, use the
COARSE
and
FINE
zero controls on the 270 to adjust the zero reading.
If you are using the 270 with a 274 multiplex unit, use the
COARSE
and
FINE
zero
controls on the 274 multiplexer to adjust the zero reading. Repeat steps 11 through 13
for each channel in use.
Note
When a 274 multiplexer is attached to the 270 instrument, the zero
controls on the 274 unit override the controls on the 270 instrument. Use
the zero controls on the multiplexer unit to adjust the zero.
14. Position the
RANGE SELECT
switch in the x1 position and adjust the
NULL
pot for a
zero reading, if necessary.
15. Repeat steps 11 through 14 to produce a zero reading on all ranges.
Note
The frequency of setting the zero will depend on the application and its
accuracy requirements, variations in ambient temperature, and the length
of time since the instrument zero was last set. For extremely critical
measurement of low pressures, check the zero more often and make
minor adjustments, to ensure the most accurate readings.
16. Position the
DISPLAY UNITS
selector switch in the desired display units.
17. Place the
RANGE SELECT
switch in the x1 position.
The system is now ready to display the pressure range of the sensor. For ¹/
10
of that
range, use the x0.1 position; for ¹/
100
use the x0.01 position.
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