How accurate is a dead weight tester?

The deadweight tester output is typically very accurate, even at its lower ranges. Industrial deadweights are available with accuracies to ±0.015% of reading. By contrast, digital pressure standards must be combined with a pressure source to generate a known pressure.

Why is the piston spinning when taking readings in dead weight tester?

The piston is rotated to reduce friction as far as possible. Since the piston is spinning, it exerts a pressure that can be calculated by application of a derivative of the formula P = F/A.

What will happen if air is trapped in a deadweight tester?

Answer: Entrapped air will make the piston’s motion “springy” rather than solid and secure.

Why a measuring instruments get out of calibration?

The accuracy of all measuring devices degrade over time. This is typically caused by normal wear and tear. However, changes in accuracy can also be caused by electric or mechanical shock or a hazardous manufacturing environment (e.x., oils, metal chips etc.).

What is the difference between Chandler and deadweight testers?

Deadweight Testers are the basic primary standard for the accurate measurement of pressure. Chandler Testers are used to measure the pressure exerted by a gas or liquid and can also generate a test pressure for the calibration of pressure gauges, electronic pressure calibrators, transducers, transmitters, recorders, etc.

Is the Chandler 55-1 deadweight tester NIST traceable?

The Chandler 55-1 Deadweight Tester is NIST traceable, accurate to 0.05% of indicated pressure and guages gas or liquid pressure measurements. The unit is reliable and composed of hardened stainless steel pistons and corrosion resistant materials with a Screw Pump that allows for fine pressure adjustments.

What is the difference between the Chandler 2-1 and Chandler 23-1 tester?

The Chandler 2-1 Deadweight Tester is 22in x 8 in x 14 in and weighs 90 lbs. It is available in Dual Range Option with a maximum pressure of 5000 PSI and a minimum pressure of 50 PSI. The Chandler 23-1 Deadweight Tester is NIST traceable, accurate to 0.05% of indicated pressure and guages gas or liquid pressure measurements.

How accurate are the deadweight tester and deadweight gauge?

The Deadweight Tester and Deadweight Gauge are the most accurate and cost effective instruments to use to calibrate secondary pressure devices or to measure unknown pressure where a high degree of precision is required. Accurate: 0.05% of indicated pressure, traceable to the National Institute of Standards and Technology (NIST).