E-DWT-H User Guide
TEST port (DH500F)
Reservoir cap
Priming pump plunger
Reservoir cap vent valve
Reference pressure monitor (RPM4-E-DWT)
Test shut off valve and fine pressure adjustment
‘Lo Q-RPT shut off’ valve position prompt LED
Figure 1: E-DWT-H with Hi and Lo Q-RPT
Introduction
This demo guide is to assist customers and
representatives to perform an effective
demonstration or evaluation of E-DWT-H. It is
written for the more complex case of a dual Q-RPT
E-DWT-H model.
Preparation
Plug in the E-DWT-H to power up.
Attach the four variable volume handles.
Open the reservoir cap (vent port) by turning
counter-clockwise.
Lo Q-RPT shut off valve
‘Lo Q-RPT active’ valve position prompt LED
‘Lo Q-RPT active’ caution indicator
Reservoir shut off valve
Variable volume (screw press)
Variable volume piston position indicator
Back out the variable volume by turning
counter-clockwise. Back it out all the way,
then turn back in (clockwise) ½ turn.
Set the Lo Q-RPT shutoff valve to the Hi
Q-RPT (clockwise).
Set the RPM4 to the Hi Q-RPT using the
[7/Range] key.
Open the test shutoff valve by turning counter-
clockwise until it is fully backed out. Turn the
handle back in (clockwise) 4 turns to bring the
valve close to mid-stroke.
Open the reservoir shutoff valve.
PN 3469593
April 2014
© 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
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DUT Connection and Priming
Note:
Remove the shipping plug from the test port on
top of the E-DWT-H enclosure.
Connect the gauge to be tested loosely into the
test port. One point in the DUT connection
should remain loose enough to bleed some test
fluid out through it. If there are multiple
adaptors used to connect the DUT, leave the
loose fitting at the highest point possible. If the
DUT is a gauge with a built-in bleed port, open
this port.
Pull up on the reservoir plunger.
Push down the reservoir plunger until clear
fluid, with no air bubbles, bleeds out the loose
DUT connection. For a system with a large
volume of air, you may need to cycle the
plunger more than once to start the fluid
flowing out the open port.
Tighten the loose DUT connection.
Push the reservoir plunger down until 30 to 50
psig is indicated on the RPM4-E-DWT display,
or until the bottom of the plunger stroke is
reached. While holding the 30 to 50 psig
pressure with the plunger, close the reservoir
shutoff valve to hold pressure in the system.
Warning
Do not generate more than 100 psig
pressure using the reservoir
priming pump plunger. The
reservoir hardware and seals are
not designed for greater pressures
and may be damaged.
Running an E-DWT-H Quick Test
As an example, the DUT tolerance
may be ±0.25%, but you may want to
enter 0.1% for the purposes of the
demonstration. It will be more likely
you’ll see an out of tolerance data
point and see E-DWT’s reaction.
Select test increments, ie. 20%
Select Up and Down points, if desired.
Confirm the test selections by pressure [ENT].
Confirm the unit’s setting of an AutoRange.
Note:
When an AutoRange is selected on
RPM4, the unit automatically sets it’s
pressure upper limit (for alarms),
stability test pass/fail criteria,
pressure display resolution and
Q-RPT range selection based on the
DUT range and tolerance entered by
the operator.
If a zero point is required for your test, open
the reservoir shutoff valve and confirm that the
test shutoff valve is open. This will produce
zero gauge pressure in the test system. After
recording this point, you should repeat step 6
of DUT Connection and Priming to prime the
system again. Be aware that even when the
reservoir shutoff and test shutoff valves are
open, there may be a difference in pressure
between the DUT and the E-DWT due to fluid
head. For more precise instruments with lower
ranges, you may need to zero the DUT before
making final test connections.
Select [ENT] on the RPM4-E-DWT to begin
Quick Test setup.
Note:
The RPM4 must be in a display
mode , such as the Rate display,
that does not use the [ENT] key for
other display functions.
Choose Quick
Select units, ie. psi.
Select DUT FS range, ie. 10,000.
Enter DUT Tolerance.
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AutoTest will guide you to set each pressure that
was defined in Running an E-DWT-H Quick Test.
Note.
Use the variable volume to control
pressures. For more precise control,
use the test shutoff/fine pressure
adjust valve. When testing DUTs,
especially analog gauges, set test
pressures according to the
indication on the DUT, then read (or
let the RPM4-E-DWT’s software read
and record) the reference pressure
value for you. When running the
AutoTest, you will not be prompted
to enter DUT indications because the
DUT is expected to be set to the
nominal test point.
Once you have set a test pressure,
E-DWT-H will automatically test for stability,
and indicate to the operator when it is safe to
take data. Press [ENT] to collect a data point
.
Hint:
Try collecting a data point while the
pressure is still unstable and you
have not yet seen the stability light
illuminate green – to see and prove
the unit’s reaction to a technician
trying to ignore or override the
stability test.
Note:
The stability ready/not ready limit is
equal to 10% of the DUT tolerance.
To collect test data, simply select [ENT].
E-DWT-H will either respond with a tone to
indicate that the DUT measurement at that point
is in tolerance, or a lower tone and OT
indication on the display to indicate that the
DUT measurement is out of tolerance.
• There is a relief valve built into E-DWT-H that
protects the Lo Q-RPT in the event that the
operator mistakenly applies a high pressure to
the Lo Q-RPT circuit.
• In addition to audible warnings upon nearoverpressure of a Q-RPT; if the Lo Q-RPT
shutoff valve is set to Lo and the Hi Q-RPT is
selected on the RPM4-E-DWT, an audible
warning sounds if over 300 psi is sensed
because it is likely that the operator has
forgotten to change one of the settings and is
applying pressure to the Lo Q-RPT without the
ability to see the measured pressure.
When the test is complete, use [SETUP],
<5ATest>, to view the stored test results.
Performance and Safety Features to Note
• Note that in the E-DWT-H design, special
attention was given to making a system that
minimize vessel expansion and thermal effects
that can cause the system to require a long
time to reach stability. As such, an operator
should be able to set stable test points in about
30 seconds, or no more than 1 minute
depending on the DUT tolerance.
• The system of lights and audible warnings on
E-DWT-H is intended to keep operators from
applying a high pressure to RPM4-E-DWT while
the Lo Q-RPT is selected. The green lights near
the Lo Q-RPT shutoff valve indicate the position
that the valve should be in based on the current
RPM4-E-DWT selection.
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