Fluke 725Ex FE 725ex Users Manual - Page 39

Zeroing with Absolute Pressure Modules, or the pressure module instruction sheet

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• To avoid damaging the pressure module from corrosion, use it only 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 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 K. If desired, continue pressing A to change pressure display units to psi, mmHg, inHg, cmH O@4 °C, 2 cmH2O@20 °C, inH2O@4 °C, inH2O@20 °C, inH2O@60 °F, mbar, bar, kg/cm2, or kPa. Using Measure Mode 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. 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 K, REF Adjust will appear 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 Kagain to exit 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 it is used. 29

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Using Measure Mode
29
•
To avoid damaging the pressure module from
corrosion, use it only 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
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
K
.
If desired, 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.
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
K
, REF Adjust will appear 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
K
again to exit 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 it is used.