Features and Specifications

• Water Operated - Dual PCU - Hydraulic Deadweight Tester

• Unit: bar

• Pressure Range: 1 to 350 bar

• Pressure Range Increment: 1 bar

• Accuracy: +/- 0.015% of reading (+/- 0.008% optional)

• Materials of Construction:
  Piston material: Tungsten carbide with nickel binder Density: 15.0 g/cm3

  Cylinder material: Hardened martensitic steel Tungsten carbide

  Coefficient of expansion: Oil piston/cylinder 16.5 ppm/Celsius

• Reservoir Volume: 150 cm3 (9.2 in3)

• Operating Fluid: Distilled or deionized water

Highlights

• Built-in hand pumps standard

• High quality screw press for pressure generation and fine control

• Clear reservoir allows for easy visual inspection of fluid cleanliness

• Mounted spirit level with adjustable feet

• Units can be trimmed to local gravity FOC

P3223-BAR Overview

The P3223-BAR Deadweight Tester (DWT) is a water operated dual PCU instrument used for accurate pressure calibrations. It’s a high-performance pressure standard for pressure measurement, utilizing the well-proven piston-gauge system. The instrument’s piston/cylinder assembly is manufactured to the highest standards, with certified accuracies traceable to International Standards Laboratories such as the National Institute of Standards and Technology (NIST). The tester is part of the P3200 series, whose features are designed to improve accuracy and performance, increase reliability, and simplify operation.

Operating Principle of a DWT

Deadweight testers serve as the fundamental benchmark for gauging pressure. They employ a tried-and-true piston-gauge system, which includes a vertically oriented piston and cylinder assembly that has been precision lapped. Precisely calibrated weight masses, representing force, are placed on the piston, representing area, which rises unimpeded within its cylinder. These weights counterbalance the upward force generated by the system’s pressure.

The pressure is determined when it is applied to a properly rotating and levitating piston. The total pressure calculated is the summation of the weights in addition to the weight assembly of the piston carrier.

P3200 Series of Deadweight Testers

The P3200 series is an alternative to oil operated deadweight testers for media sensitive applications up to 10,000 psi. It uses distilled water as the operating fluid making it ideal for those applications where oil is not allowable. With features designed to improve accuracy and performance, increase reliability and simplify operation these deadweight testers can be used to calibrate virtually any pressure sensing device, including transducers, transmitters, gauges or pressure switches.

The P3200 series are available in single or dual piston formats for increased operating ranges. Units can be supplied in psi, bar, kgf/cm², and MPa. These robust instruments are highly accurate, quick and easy to use. Units feature a built-in priming pump for large volume applications, piston flotation indicators and a high quality screw press for fine pressure control.

Instrument Base

The hydraulic system comes in three fundamental types: models with low pressure, high pressure, and dual pistons. The creation and regulation of pressure are handled by a high-quality screw press situated at the tester’s front. All hydraulic models come standard with an integrated hand pump to prepare the system and handle substantial volume needs.

Categories of P3000 Models

There are many models in the P3000 product (including the P3100 and P3200), so for the purpose of this uncertainty analysis they are categorized as shown below.

*Full model names include variations depending on the nominal unit of measurement and inclusion of a built-in pressure pump.

Piston/Cylinder Assemblies

The piston/cylinder assembly is the heart of each deadweight tester. They are manufactured from materials that provide stability, durability, and low thermal coefficients and distortion. Fluke's experience and knowledge of piston/cylinder production and calibration ensures the precision and performance required for today’s demanding calibration requirements.

Masses

Standard weight masses are series 3 nonmagnetic austenitic stainless steel. Each mass is marked with the serial number of the instrument and the nominal pressure value relative to the high or low-pressure piston, when applicable. Optional fractional weights are stainless steel and/or solution heat treated aluminum.

Minimum Standard Weight Increments

• Up to 500 psi (35 bar): 1 psi (0.1 bar)

• 500 psi to 5 000 psi (35 bar to 350 bar): 10 psi (1 bar)

• 5 000 psi to 20 000 psi (350 bar to 1 400 bar): 20 psi (2 bar)

• Model P3112: 1 psi (0.1 bar)

Gravity

Gravity varies significantly with geographical location and this variation has a direct effect on the force of the weights and the accuracy of the deadweight tester. Each instrument can be trimmed to local gravity at no extra cost. If unspecified, instruments will be calibrated to Standard Gravity at 980.665 cm/s2.

PressCal Software

PressCal software is an optional Windows-based software program that allows users to easily apply all necessary corrections (e.g. local gravity, temperature, pressure head, etc.) to enhance the deadweight tester performance. Calibration details are then stored and/or used to automatically create a calibration certificate. The use of PressCal allows for an improved accuracy of 0.008 %. It will permit calibration in any of 12 different pressure units, using the existing weight set.

What's in the Box

• P3223-BAR Hydraulic Deadweight Tester

• Weight Set

• Detachable lid

• Accredited Calibration Certificate

• Adaptors

• Operating fluid

• Spare seals