Fluke E-DWT-H User Manual

™

E-DWT-H

Electronic Deadweight Tester

Hydraulic deadweight tester performance

with digital measurement convenience

E-DWT-H Electronic Deadweight Tester™— leave the deadweight behind

A modern alternative to the traditional deadweight tester

E-DWT-H breaks new ground,
improving the hydraulic pressure
calibration process. E-DWT-H is
an electronic calibrator designed
to replace mechanical, piston­cylinder and weight based
deadweight testers. It’s a lighter
weight, easier-to-use deadweight
tester alternative that is at home in
the lab or instrument shop, as well
as in the field performing in-situ
calibrations and tests.

This complete hydraulic pres­sure calibration system combines
the convenience and precision of
continuous, real time electronic
pressure measurement with the
simple and direct operation of
high quality operator controlled
pressure generation hardware.

E-DWT-H one year measurement
uncertainty is ± 0.02 %
of reading with ranges up to
30,000 psi. It can be configured to
provide this uncertainty from its
full scale down to 1% of its range.
Built-in pressure generation and
control hardware allow the opera­tor to fill and prime the system
under test and generate and pre­cisely adjust pressure throughout
the range with ease.

Deadweight tester perfor­mance with digital measure­ment convenience

E-DWT-H offers precision, low
measurement uncertainty and the
stability over time of a conven­tional deadweight tester without
the inconveniences associated
with the piston-cylinders, weights,
hand pumps, and interconnecting
plumbing.

• No weights to load and unload
or regularly send out for
calibration

• No need to know and correct
for local gravity or ambient
temperature

• No piston-cylinder changes;
switch Q-RPT ranges in seconds

• Not sensitive to level or
vibration

• Able to set and read any pres­sure value exactly, no minimum
increment limited by smallest
available masses

• Operates in any unit of measure
while deadweight tester is typi­cally limited to the pressure unit
stamped on the mass

• Perfect for applications that
require setting a nominal
pressure precisely on the

device under test and measur­ing it, such as analog gauge
calibration

• On-board, AutoTest calibration
routines and data acquisition

• Interfaceable with a PC or
laptop to allow for automated
data acquisition

• Two year calibration interval
supported at measurement
uncertainty of ± 0.025 % of
reading.

• Easily recalibrated without
crossfloating. Automated cali­bration of E-DWT-H is possible
using COMPASS
software.

®

for Pressure

Versatility to cover a broad
workload in a variety of
environments

The E-DWT-H is at home in
metrology and calibration labs, on
the production floor or in the field.

It operates with Sebacate cali­bration fluid, mineral oil, Skydrol
and other liquids.

An optional battery/charger
pack supports up to eight hours of
operation away from line power.

®

AutoTest™ lets E-DWT-H
operators quickly define test
points and adjust all of the
range-dependent settings
with a single function.

The resolution and stability test
used by the RPM4-E-DWT are
set according to the range of the
device under test. The upper limit
setting is also set and provides
range-based warnings and
overpressure protection. While
running AutoTests, the operator is
prompted to set each sequential
test point and test data is stored

2 Fluke Calibration E-DWT-H™ Electronic Deadweight Tester

in the RPM4-E-DWT for recall or
download. Typical test setup is
quick and easy, but more com­plex tests can also be stored and
reused.

Broad workload coverage

The E-DWT-H has the operational
versatility to calibrate and test a
broad range of pressure measur­ing instruments including:

• Analog gauges

• Transducers

• Calibrators

• Sensors

• Transmitters

E-DWT-H in lab environment

All the features you expect in today’s

Measurement Uncertainty (% of Q-RPT Max Span)

state-of-the-art instruments, including:

Accuracy and performance

• Can be configured to provide
uncertainty of ± 0.02 % of read­ing from 1 % to 100 % of full
scale range

• Low torque variable volume
allows for pressure generation
up to 200 MPa (30,000 psi) with
minimal physical effort

• Separate fine adjustment
tool for maximum, superfine
controlresolution

• User defined resolution and
ready limits enable user to
optimize performance based
on DUT specifications

• High pressure isolation valve
and pressure relief valve protect
the low pressure reference
transducer from over pressure
when high pressure reference
transducer is active

Ease of use

• AutoRange feature optimizes
measurement and safety
features for the specific range of
the instrument being calibrated

• Simple rezeroing while vented
at atmospheric pressure

• Simple, objective pressure
“ready/not ready” indicator
with user adjustable criteria
to ensure repeatable results
among operators

• Not dependent on local gravity
or ambient temperature

• Sets and reads any pressure
value directly in any unit of
measure, without moving
weights

• Built-in priming system to fill
system with test fluid and purge
unwanted air to assure smooth
operation

• Optional foot switch accessory
allows hands-free data collec­tion when running AutoTests

Portability

• Rechargeable battery pack
option for eight hours of field
operation

• Everything to set, adjust and
read pressure in one compact,
transportable package

• Optional shipping/carrying
case with handles and wheels
allows for easy transport to field
application

• Proven rugged and weath­erproof design with room for
accessories.

Automation

• RS-232 interface allows for
real time automated data
collection and customized
report generation using Fluke
Calibration’s COMPASS for
Pressure Calibration software

Free upgrades

• Flash memory for simple and
free embedded software
upgrades from
www.flukecal.com

Q-RPT 2 Years : ±(0.025% of reading,
or 0.0025% of Q-RPT span, whichever is greater)

Q-RPT 1 Year: ±(0.02% of reading, or 0.002% of
Q-RPT span, whichever is greater)

0.02% FS Device

Measured Pressure (% of Q-RPT Span)

Reference pressure monitor and
Q-RPT quartz reference pressure
transducers

The E-DWT-H’s electronic reference pressure
monitor is a dedicated version of the Fluke
Calibration RPM4, designated RPM4-E-DWT.
RPM4-E-DWT can be configured with one
or two high precision quartz reference pres­sure transducers (Q-RPTs) with ranges from
7 MPa (1000 psi) to 200 MPa (30,000 psi).

E-DWT-H’s outstanding pressure measure­ment specifications are made possible by
Fluke Calibration’s exclusive quartz reference
pressure transducer (Q-RPT) modules.

Q-RPTs measure pressure by measur­ing the change in the natural oscillating
frequency of a quartz crystal with pressure
induced stress. To be qualified for use in
a Q-RPT module, each transducer is indi­vidually evaluated and characterized using
automated primary pressure standards. Only
transducers exhibiting superior levels of lin­earity, repeatability and stability are selected.
A proprietary compensation model, derived
from 20+ years experience with thousands
of quartz pressure transducers, is applied to
optimize the metrological characteristics.

Q-RPT module advantages

In addition to outstanding metrological
characteristics, Q-RPT modules offer the
advantages of:

• Negligible warm-up time

• Quartz element isolated from test medium

• Minimal sensitivity to orientation

Q-RPT
measurement
uncertainty

% of reading
uncertainty gives
tremendous
rangeability.

30 40 60 70 80 90 1002010 50

E-DWT-H™ Electronic Deadweight Tester Fluke Calibration 3