Fluke E-DWT-H Operating Manual

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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

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.

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.

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