GE SI Pressure S3000P

Pneumatic deadweight tester

Starting at $6,900

The GE SI Pressure S3000P Pneumatic Deadweight Tester is the culmination of over 50 years experience in the production and design of primary pressure standards. With features designed to improve accuracy and performance, increase reliability, and simplify operation, these deadweight testers from the GE SI Pressure S3000P Series can be used to calibrate virtually any pressure sensing device, including transducers, transmitters, gauges, or pressure switches.

Each deadweight tester is supplied with a detachable lid that makes it neat, compact, and easily portable. The S3000P's weight masses are stored in a high-quality case with a self-locking mechanism to protect them during transit. All DWTs are provided with a traceable certificate of accuracy, weight mass details, 1/8, 1/4, 3/8, and 1/2 NPT or BSP female adaptors, operating fluid (where applicable), and spare seals.

Operating Principle

Deadweight testers are the primary standard for pressure measurements. Utilizing the well proven piston-gauge system, consisting of a vertically mounted, precision lapped piston and cylinder assembly, accurately calibrated weight masses (Force) are loaded on the piston (Area), which rises freely within its cylinder. These weights balance the upward force created by the pressure within the system. The pressure is measured when placed on a correctly spinning and floating piston. The total pressure measured is the summation of the weights plus the piston weight carrier assembly.

Instrument Base

There are four basic variations in the pneumatic deadweight tester; single pressure, single vacuum, dual vacuum and pressure, and oil-lubricated, pneumatically driven high-pressure models. Pressure or vacuum is generated by an external source or an optional built-in hand pump. The hand pump option is not available on deadweight testers above 500 psi (35 bar).

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.

Gas Supply

All deadweight testers from the GE SI Pressure S3000P Series are fitted with a 1/4 NPT female external supply port for connection to the gas supply source. A compressed gas bottle (nitrogen or dry air) fitted with a pressure regulator is recommended. Ten percent above the maximum pressure is required. A built-in hand pump is available on some models to generate pressures to 300 psi (20 bar).

For vacuum requirements, an external vacuum pump can be connected to the 1/4 NPT port. The built-in hand pump will also generate up to 90% vacuum.