Ametek - Test & Calibration Instruments

HL Hydraulic and Gauge Deadweight Tester

The HydraLite Hydraulic Deadweight Tester is a primary standard that features a re-entrant type measuring piston and cylinder assembly that helps maintain accuracy as the test pressure increases. The HL Series tester is designed for rapid interchanging between high and low pistons and is NIST traceable and accurate to ±0.05% using non-magnetic die-cast alloy or aluminum weights  calibrated to international standard gravity at 9.80665 m/s2. A compact screw pump with ratchet handle is easy-to-use. The unit is also available as a deadweight gauge for accurate measurements and use as a comparison standard.

Low center of gravity
he HL tester is an easy-to-use and portable primary standard capable of offering laboratory accuracy in the field. The unit is designed to be self-contained with all necessary components stored under the cover. A screwpump pressure source on the tester model offers a convenient method to raise and lower pressure for rapid testing.


  • Presure Range
    100 to 22,500 kPa (10 to 3,000 psi)
  • Accuracy
    to ±0.05% of Indicated Reading
  • Available units
    psi, kg/cm2, bar, kPa
  • Interchangeable Weights
    Models are available with dual piston/cylinder assemblies that utilize one weight set.
  • Compact Design and Portability
    The HydraLite is designed for use in the field and is completely self-contained within the cover of the unit.
  • Includes Compact Screw Pump with Ratchet Handle
    The tester models are supplied with a convenient screwpump as a pressure source. This pump has a ratchet feature that prevents the unit from depressurizing unexpectedly. The gauge model can be retrofitted with the pump as an accessory.
  • Overhung Weight Carrier
    Reduces side thrust and friction on the measuring piston and cylinder assembly, thus improving measurement accuracy
  • Positive Over-pressure Protection
    Prevents Piston Damage
  • NIST Traceable
    All units are supplied with certifications that are traceable to NIST.


Model: HydraLite HL and HLG
Type: Hydraulic, piston gauge
Pressure range: to 22,500 kPa / 3,000 psi (model dependent)
Accuracy (12 months): to ±0.050% rdg
Increments (low - min): 0.1 psi, 0.005 kg/cm2, 5 mbar, 0.5 kPa
Increments (high - min): 0.5 psi, 0.025 kg/cm2, 25 mbar, 2.5 kPa
Gravity: 9.80665 m/s2 (international standard)
Piston/cylinders: Single or dual (as ordered)
Columns: Single
Weight sets: Single (as ordered)


  • A wide range of features and Specs available in a DataSheet .
Order no. Description
T-536 Overall rebuild kit - HL/HLG Buna N (standard material)
MGAAA/QT Tester oil - 0.95 l (1 qt)
MGAAA/GL Tester oil - 3.79 l (1 gal)
99-90019 Oil dispenser
11-90009 Adapter (1/4” NPT male x 1/2” NPT female)
T-786 Adapter (1/4” NPT male x 1/4” BSP female)
T-787 Adapter (1/4” NPT male x 1/2” BSP female)
60I104 Roll of Teflon tape
101549 Bonded seal (1/2”)
60R120 Bonded seal (1/4”)
60R122 Bonded seal (1/8”)
K-1562 Tripod for convenient field use