6531, 6532 E-DWT Electronic Deadweight Tester Kits

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A powerful, complete hydraulic pressure calibration system to cover a wide workload

Fluke Calibration improved the hydraulic pressure calibration process with the introduction of E-DWT-H electronic deadweight tester. E-DWT-H is an electronic calibrator designed to deliver traditional hydraulic deadweight tester performance with digital measurement features and convenience. Some improvements offered by E-DWT-H include:

  • No weights to load and unload, transport or send out for calibration
  • Provides real-time pressure indication with no need to know and correct for local gravity or ambient temperature
  • No piston-cylinder changes
  • No significant sensitivity to level or vibration
  • Able to set and read any pressure value exactly, no minimum increment limited by smallest available masses; perfect for applications that require setting a nominal pressure precisely on the device under test and measuring it, such as analog gauge calibration
  • Operates in any unit of measure, switching easily from one unit to the next

 The E-DWT-H is at home in metrology and calibration labs, on the production floor or in the field. It can operate with a wide selection of test mediums, including Sebacate calibration fluid, mineral oil, water and other liquids. ± 0.02 % of reading total one-year measurement uncertainty rivals the best laboratory deadweight testers.




Power requirements
To RPM4-E-DWT: 12 V dc 1.2 A
To AC to DC power supply: 100 V ac to 240 V ac, 50/60 Hz
Temperature range
Storage: - 20 °C to 70 °C
Operating: 10 °C to 40 °C
Relative Humidity
Storage: 0 % to 100 %
Operating: 0 % to 70 %
1 Q-RPT: 12 kg (26 lb) approximate
2 Q-RPT: 14 kg (30 lb) approximate
E-DWT footprint: 41.4 cm W x 37.1 cm D (16.3 in x 14.6 in)
E-DWT height: 26.9 cm (10.6 in), 33.6 cm (13.2 in) to max variable volume handle height
Pressure range Up to 200 MPa (30k psi), depending on configuration
Operating medium All 6531 and 6532 E-DWT Kits are shipped dry, standard preparation. Can be filled with di-ethyl-hexyl sebacate, silicon oils, propylene glycol, fully fluorinated liquids, partially fluorinated liquids, isopropyl alcohol and distilled water or mineral oil.
Reservoir capacity 300 cc (18 in3)
Variable volume displacement 3 cc (0.18 in3), 200 MPa (30,000 psi) maximum
Filling and priming pump displacement 3.7 cc (0.23 in3)
TEST pressure connection DH500 female, 200 MPa (30k psi) maximum working pressure. Adapters included for 1/8 in, 1/4 in, 3/8 in and 1/2 in NPT, 1/8 in, 1/4 in, 3/8 in and 1/2 in BSP, M20 x 1.5 and M14 x 1.5. Adapter maximum working pressure is 140 MPa (20k psi). Note: DH500 is a gland and collar type fitting for 6 mm (1/4 in) coned and left hand threaded tubes equivalent to AE F250C, HIP HF4, 9/16-18 UNF, etc.
Pressure Limits
Maximum Working Pressure: Range of RPM4-E-DWT monitor’s Hi Q-RPT
Maximum priming pump pressure: 700 kPa (100 psi)
Maximum Working Pressure: with Lo Q-RPT selected: Range of RPM4-E-DWT monitor’s Lo Q-RPT
Communication ports: RS-232 (COM1, COM2)

Pressure measurement

Warm up time 15 minute temperature stabilization recommended from cold power up
Normal Operating Temperature Range 10 °C to 40 °C (50 °F to 104 °F)
Resolution Default: 0.01 % of active range
User adjustable to 1 ppm of Q-RPT maximum or 10 ppm of active AutoRange, whichever is larger
200 MPa (30,000 psi) ranges:  ± 0.018 % of reading or 0.0036 % of Q-RPT span, whichever is greater
All other ranges:  ± 0.018 % of reading or 0.0018 % of Q-RPT span, whichever is greater
Predicted Stability2
One year: ± 0.0075 % of reading
Two year: ± 0.015 % of reading
Measurement Uncertainty3
One year:
200 MPa (30,000 psi) ranges:  ± 0.02 % of reading or 0.004 % of Q-RPT span, whichever is greater
All other ranges:  ± 0.02 % of reading or 0.002 % of Q-RPT span, whichever is greater
Two year:
200 MPa (30,000 psi) ranges:  ± 0.025 % of reading or 0.005 % of Q-RPT span, whichever is greater
All other ranges:  ± 0.025 % of reading or 0.0025 % of Q-RPT span, whichever is greater

1. Combined linearity, hysteresis, and repeatability. Precision does not include stability or calibration reference uncertainty.
2. Predicted Q-RPT measurement stability limit (k=2) assuming regular use of AutoZero function and short term stability between rezeroing.
3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted stability with rezeroing, temperature effect from 10 ºC to 40 ºC and calibration uncertainty (assumes calibration reference uncertainty of ±0.005 % of reading, k=2), combined and expanded (k=2) following the ISO “Guide to the Expression of Uncertainty in Measurement.

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