APPLICATIONS OF HYDRAULIC DEADWEIGHT TESTERS:
• Repeatability better than ±0.005% of reading
• Accuracy up to ±0.025% of reading and even better using a DADT converter
• Dual volume control valve delivers high volume to rapidly build pressure
• Vernier adjustment for fine adjustment of pump pressure
• Re-entrant type piston and cylinder assembly maintains accuracy as test pressure increases and improves the spin and float times
• Single and dual-column versions. Conversion kits available
• Enclosed piston/cylinder assembly for safe operation
• Available engineering units: psi, bar, kPa, kg/cm2
AMETEK APPLIED TECHNOLOGY:
Overhung weight carriers - minimizes side thrust on the measuring piston and cylinder assembly resulting in improved measurement accuracy.
Re-entrant piston/cylinder - This design reduces the rate of fluid leakage, thus increasing the time available for calibration of instruments.
Dual volume hand pump - This allows the pump to deliver a high volume in order to rapidly fill systems and build pressure. The low volume permits easy pumping at high pressures and a more gradual approach to the point of pressure calibration.
Positive overpressure protection - The vertical movement of the measuring piston assembly is restricted by a positive stop. This will prevent the piston from damage caused by accidental removal of the weights while pressurized. These stops are rated at the maximum tester pressure.
DEADWEIGHT TESTER TYPE T
These high accuracy deadweight testers are ideal for laboratory or field use. The type T tester uses distilled water or fluid compatible with 300 series stainless steel and MONEL (including AAA tester oil). For applications up to 15,000 psi (1,000 bar). An optional dual piston lets you interchange piston/cylinder assemblies to extend the pressure measurement range using the same weight set. A kit is available for converting to a dual column tester.
Separate columns are provided for high and low pressure measuring piston/ cylinder assemblies. Range changes are achieved using a built-in crossover valve that allows three-point calibrations to be performed in seconds. It is not necessary to purchase a second set of weights. Fill fluids and pressure ranges are the same as type T single column testers.
HYDRALITE (HL) PORTABLE DEADWEIGHT TESTER
This extremely compact, self-contained portable tester is designed for pressure ranges from 10-200 psi (1-15 bar) up to 50-3,000 psi (5-225 bar). Accurate to ±0.05% of reading, the unit features an easy-to-use screw pump with ratcheting handle and re-entrant type piston/cylinder assembly. This helps maintain accuracy as the test pressure increases. Weights and piston assemblies are interchangeable. The unit's AAA tester oil may be easily inspected through the transparent reservoir. Compact design in only 9 x 9 x 10 in (23 x 23 x 24.5 cm). Tripod option available for field applications.