DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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1. INTRODUCTION
Page 1 © 2009 DH Instruments, a Fluke Company
1. Introduction
1.1 Product Overview
The E-DWT-H electronic deadweight tester is to generate, set and measure pressure as required for a
variety of pressure calibration and testing applications. The E-DWT-H is used in the lab or instrument
shop or can be taken into the field for performing in-situ calibrations and tests. This hydraulic pressure
calibration system combines a high performance electronic reference pressure monitor and manually
operated pressure generation and control hardware in a single, compact and rugged package. E-DWT-H
offers the ease of use and precision of continuous, real time electronic pressure measurement with the
simple and direct pressure control of high quality manual pressure hardware. E-DWT is named
“electronic deadweight tester” because it is intended as a lightweight and easy to use, modern alternative
to conventional piston-cylinder and weight based deadweight testers.
The E-DWT’s electronic reference pressure monitor is a special version of DHI’s 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 (1 000 psi) to 200 MPa (30 000 psi).
The RPM4-E-DWT is controlled locally by the operator using its front panel display, keypad and optional
foot pedal or remotely by a computer using ASCII character command strings over its RS-232 interface.
RPM4-E-DWT uses an AutoRange feature to automatically select the most appropriate Q-RPT and to
optimize the E-DWT-H setup to cover the desired range of operation. When two Q-RPTs are included, a
half-turn valve isolates and protects the Lo Q-RPT from high pressure when the Hi Q-RPT is in use.
Visual and audible indicators assist the operator in setting the shut off valve correctly.
The E-DWT-H includes the hardware necessary to fill and prime the system under test and generate and
precisely adjust pressure up to E-DWT’s 200 MPa (30 000 psi).
The E-DWT-H can be powered with an optional battery/charger pack for use in locations where AC power
is not readily available.