Page 17 - Pressure Calibration Brochure

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TECH

TIPS

• Deadweight tester

weights are calibrated to
match a wide range of

pressure units.

• Local gravity often is the
largest factor affecting

accuracy. Use Fluke
PRESSCAL software to
To perform the test:
achieve accuracy of
+/- 0.008%.

STEP
The pressure gauge should be mounted in the same orientation • To increase the number of
1
(vertical or horizontal) as in the process.
available set points, use
incremental weight sets.

Measurement points should be distributed uniformly over the STEP
• Forgo wrenches or PTFE
2
calibration range.
tape by using adapters to
it multiple sizes and types

of devices with leak tight
Calibrated weights are placed on the instrument corresponding STEP
seals to 20,000 psi.
to the measurement points.
3

• Safety First! Choose ittings,
tubing and seals with
Pressure is added with an internal pump or screw press until the piston STEP
4
pressure ratings above the
holding the weights begins to loat.
full scale of the instrument.

• Hydraulic systems are
The piston and weight are spun by hand to minimize friction.
STEP
preferable to gas systems
5
for pressures above 2000

psi due to safety and ease
of use.
While the piston is loating the reading on the device under test is com- STEP
pared to the pressure corresponding to the sum of the selected weights.
6
• Consider achieving

cleanliness using distilled
water as a media or use a

liquid separator from Fluke
instead of gas.

• Lubrication can improve

performance by using oil

when it is allowed.

Additional resources
Check out the 700G videos.
For more in depth information about

this application check out these videos
and application notes from Fluke.
700G Data Sheet.
Interpreting Speciications for Process Calibrators, Application Note

17