Fluke 726 FE 726 Users Manual - Page 38

Zeroing with Absolute Pressure Modules, for 3 seconds

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726 Users Manual • Never apply pressure above the rated maximum printed on the pressure module. • Only use the pressure module with specified materials. Refer to the printing on the pressure module or the pressure module instruction sheet for the acceptable material compatibility. 1. Connect a pressure module to the Calibrator as shown in Figure 13. The threads on the pressure modules accept standard ¼ NPT pipe fittings. Use the supplied ¼ NPT to ¼ ISO adapter if necessary. 2. Press either A or a. The Calibrator automatically senses which pressure module is attached and sets its range accordingly. 3. Zero the pressure module as described in the module's Instruction Sheet. Modules vary in zeroing procedures depending on module type, but all require pressing A for 3 seconds. Continue pressing A to change pressure display units to psi, mmHg, inHg, cmH2O@4 °C, cmH2O@20 °C, inH2O@4 °C, inH O@20 2 °C, inH O@60 2 °F, mbar, bar, kg/cm2, or kPa. Zeroing with Absolute Pressure Modules To zero, adjust the Calibrator to read a known pressure. This can be barometric pressure, if it is accurately known, for all but the 700PA3 module. The maximum range of 700PA3 is 5 psi; therefore the reference pressure must be applied with a vacuum pump. An accurate pressure standard can also apply a pressure within range for any absolute pressure module. To adjust the Calibrator reading, proceed as follows: 1. Press A, REF Adjust appears to the right of the pressure reading. 2. Use X to increase or W to decrease the Calibrator reading to equal the reference pressure. 3. Press A again to exit the zeroing procedure. The Calibrator stores and automatically reuses the zero offset correction for one absolute-pressure module so that the module is not rezeroed every time you use it. 28

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726
Users Manual
28
•
Never apply pressure above the rated
maximum printed on the pressure
module.
•
Only use the pressure module with
specified materials. Refer to the printing
on the pressure module or the pressure
module instruction sheet for the
acceptable material compatibility.
1.
Connect a pressure module to the Calibrator as
shown in Figure 13. The threads on the pressure
modules accept standard ¼ NPT pipe fittings. Use
the supplied ¼ NPT to ¼ ISO adapter if necessary.
2.
Press either
A
or
a
. The Calibrator
automatically senses which pressure module is
attached and sets its range accordingly.
3.
Zero the pressure module as described in the
module’s Instruction Sheet. Modules vary in zeroing
procedures depending on module type, but all require
pressing
A
for 3 seconds
.
Continue pressing
A
to change pressure display
units to psi, mmHg, inHg, cmH
2
O@4
°
C, cmH
2
O@20
°
C, inH
2
O@4
°
C, inH
2
O@20
°
C, inH
2
O@60
°
F, mbar,
bar, kg/cm
2
, or kPa.
Zeroing with Absolute Pressure Modules
To zero, adjust the Calibrator to read a known pressure.
This can be barometric pressure, if it is accurately known,
for all but the 700PA3 module. The maximum range of
700PA3 is 5 psi; therefore the reference pressure must be
applied with a vacuum pump. An accurate pressure
standard can also apply a pressure within range for any
absolute pressure module. To adjust the Calibrator
reading, proceed as follows:
1.
Press
A
, REF Adjust appears to the right of the
pressure reading.
2.
Use
X
to increase or
W
to decrease the Calibrator
reading to equal the reference pressure.
3.
Press
A
again to exit the zeroing procedure.
The Calibrator stores and automatically reuses the zero
offset correction for one absolute-pressure module so that
the module is not rezeroed every time you use it.