E-DWT-H™ Electronic Deadweight Tester

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E-DWT-H™ Electronic Deadweight Tester

Download PDF data sheet (1,417kb)

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, piston-cylinder 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® for Pressure software.

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 • RS232 interface allows for real time automated data collection and customized report generation using DHI’s COMPASS® for Pressure calibration software Free upgrades • Flash memory for simple and free embedded software upgrades from www.dhinstruments.com
For full specification please download the PDF data sheet (1,417kb).

Chell Instruments