Page 21 - Pressure Calibration Brochure

To perform the test:

The pressure gauge should be mounted in the same ori- STEP
TECH
1
entation (vertical or horizontal) as in the process.
TIPS

The reference pressure gauge (2700G) should be mount- STEP
• The key to a good experience in using a
ed vertically.
2
hand pump, either pneumatic or hydraulic, is
to test and debug your test setup in the shop

STEP
before going to the ield. Minimizing the
For hydraulic comparators prime the luid with the prim- number of pressure connections minimizes
ing pump, to remove any bubbles.
3
the probability for leaks. Mount the test
gauge carefully to the test pump in the shop.

Measurement points should be distributed uniformly over STEP
• Be sure to consider the hoses that connect

the calibration range. Conveniently source pressure with 4
from the hand pump to the device to be
a manual pump up to 300 psi, after that use an external tested. There are a variety of specialty “no

pressure supply.
tools required” connectors to connect to
the test hose to make this easy. If these

connectors are not available be sure to have
For gas comparators use the ine needle valve or ine STEP
a variety of adapters, wrenches and PFTE
adjustment screw press to precisely meter the pressure.
5
sealing tape to be able to connect from the
test hose to the input port of the device for

STEP
testing. If using “push it” hoses it is likely
With hydraulic models use the screw press to source and they will eventually leak. Each time - a push
ine adjust the pressure.
6
it hose is connected, it leaves a mark on the
test hose and eventually does not seal well.

The source pressure can be adjusted until the device To eliminate the leak cut off the affected
STEP
portion of the test hose so there is a clean
under test is reading a nominal pressure or until the 7
surface to connect to. This process will need
reference gauge reads the nominal pressure.
to be repeated with use.

•
When attempting to get maximum pressure
out of a pneumatic pump, adjust the ine

adjust vernier all the way to down to the stop
so turning the vernier increases the pressure.

When approaching the target pressure use
the vernier to increase to your target pressure.

• When using hydraulic hand pumps

remember the thermodynamic effect. Once
any luid is compressed, the temperature

increases and the luid expands. This
becomes obvious when pumping to a target
Additional resources
pressure with a hydraulic pump. Once
the target pressure is met the luid has For more in depth information about

expanded. As the luid cools and contracts this application check out these videos
the pressure quickly bleeds down until
and application notes from Fluke.

it reaches temperature equilibrium, this
can take 5 minutes or more. Once the
Check out the 700G videos.
temperature stops changing, dial the desired
pressure back in with the vernier adjuster.

700G Data Sheet.

Interpreting Speciications for Process Calibrators,
Application Note

21