MNR 700-VLP Minerva Low Pressure Deadweight Tester

This deadweight tester is a robust and flexible pressure measurement instrument with high accuracy.

Accurate and stable pressure measurement in a low measuring range.

  • Pressure range 0,005 to 25 kPa
  • Accuracy 0,020% of reading, optional 0,015% or 0,010%
  • Traceable to International Standards. Supplied with ISO/IEC 17025 accredited certificate
  • Quick and simple to operate
  • Gas operated

Operating principle

operating principle mnr 700The operating principle of the MNR-700-VLP is based on the dynamic interaction between a flow of gas and a non-cylindrical piston. The diagram shows piston (1) coaxially located in the cylinder (2) transforming force (mg) into pneumatic pressure (P). The inclusion of the insert (3) and the two volumes (5 & 6) assures dynamic stability. The high accuracy of the MNR-700-VLP is provided by the two cascade regulators (4) which also isolate the output pressure from supply pressure fluctuations. When air is passing between the piston and cylinder a reactive feedback force is generated. This force does not exceed 0,0015 mg which is sufficient to self-centre the piston.

Technical Specifications

Pressure range:  
MNR-700-VLP-25kPa 0,02 – 25 kPa (gauge) or 0,005 – 25 kPa (differential)
Accuracy 
*Note1
Accuracy Reading 0,020%
0 .. 0,4 kPa : ± 0,1 Pa
0,4 .. 2 kPa : ± 0,030% of reading
>2 kPa : ± 0,020% of reading

Accuracy Reading 0,015%
0 .. 0,4 kPa : ± 0,1 Pa
0,4 .. 2 kPa : ± 0,025% of reading
>2 kPa : ± 0,015% of reading

Accuracy Reading 0,010% **Note2
0 .. 0,4 kPa : ± 0,1 Pa
0,4 .. 2 kPa : ± 0,020% of reading
>2 kPa : ± 0,010% of reading
Operating temperature 15 to 35 °C
Operating atmospheric pressure 85 -110 kPa abs
Operating humidity range 30 to 80 % RH
External air supply 300-400 kPa

Setting internal pressure regulator
150 +/- 7,5 kPa
External air supply quality Dry clean air, purity class 1-2-1 (ISO 8573-1)
Dimensions calibrator 390 x 310 x 240 mm (l x w x h)
Dimensions case for piston, mass set & accesoiries 390 x 310 x 147 mm (l x w x h)
Weight calibrator 13,5 kg

Weight case for piston, mass set & accesoiries 5,3 kg
Ordering code Accuracy Reading 0,020%  MNR-700-VLP-25kPa-0.020
Ordering code Accuracy Reading 0,015%  MNR-700-VLP-25kPa-0.015
Ordering code Accuracy Reading 0,010%  MNR-700-VLP-25kPa-0.010

 

*Note 1: reference parameters for defined specification:
- Temperature: 20 +/- 1 Deg.C.
- Atmospheric pressure: 101,325 +/- 3 kPa
- Relative Humidity: 50 +/- 20%

**Note 2: Consult Minerva for availability

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