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Ametek HL Series
Hydraulic Portable Deadweight Tester

 
  • Dual Range: 1-45 & 5-225 kg/cm2
  • Accurate to ±0.05% of Indicated Pressure
  • Integral Screw-Type Piston Pump
  • Non-Magnetic, Die-Cast Alloy or Aluminum Weights
  • Completely Self Contained in Anodized Aluminum Case
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Ametek HL-36 Shown

Product Information
Datasheet 1.47 MB
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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.

The 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 screw pump pressure source on the tester model offers a convenient method to raise and lower pressure for rapid testing.
 
Features
Functions

Details

Re-entrant piston/Cylinders

The HL deadweight employs a re-entrant type piston/cylinder assembly. This design applies test fluid to the outside and inside of the cylinder. Unlike a simple piston/cylinder, this configuration reduces clearance between the piston and cylinder as pres-sure increases. This reduces the rate of fluid leakage and increases float time, offers the technician more time for testing, and reduces the amount of pumping necessary to sustain the fluid loss.
Pressure Media Because the HL is manufactured using brass and aluminum components, AAA Tester Oil is the recommended and supplied pressure media. Other fluids compatible with stainless steel, brass, aluminum, and Buna may be used; however, consideration should be given to the cleanliness of the fluid. AAA Tester Oil is triple-filtered to remove suspended solids that can harm the piston/cylinder assembly.
Overhung Weight Carriers Another feature of HL deadweight tester is the way that the weights are positioned on the carrier - an overhung weight carrier design. This design employs a tube carrier that is positioned over the column and onto the piston driver, which lowers the center of gravity of the weights reducing side thrust and friction. This design lengthens the life of the piston and cylinder assembly thus improving measurement accuracy.
Overpressure protection The measuring piston assembly features positive over-pressure protection restricting vertical movement of the measuring piston by a piston cap. This positive stop will prevent the piston from damage due to accidental removal of the weights when pressurized.
Quick Setup and Operation The setup for the HK tester is completed by simply connecting two tubes,- one for the supply and one for the unit-under-test, leveling the HK, and adding the appropriate weights. Operation is fast and efficient with no valves to adjust and no regulation needed between set points. Pressure regulators are not required if the air supply is within the tester’s operational requirements.
Worldwide engineering units The HL deadweight tester and HLG gauge can be manufactured in four different engineering units: psi, bar, kg/cm2, and kPa. All of the different engineering units are available in any of the configurations.
HydraLite HLG Gauge The AMETEK HydraLite HLG Gauge is a precision, portable instrument used to accurately measure pressure in field conditions. The HydraLite HLG gauge may be used as a primary standard instrument where a high accuracy reference measurement is needed. Simply connect the gauge to the process and add weights until there is a proper float. Standard accuracy is ±0.1% of indicated pressure traceable to the U.S. National Institute of Standards and Technology (NIST). The instrument may also be specified with +0.05% accuracy. If you initially need a gauge and later find that you need a full tester, an accessory kit is available to incorporate the screw pump into the gauge.
Easy Leveling AMETEK floating ball testers incorporate a bulls-eye level for reference when preparing the unit for use. The tester also employs a 3-leg leveling system which is more convenient and is superior to a 4-leg system.
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Specifications
Functions

Details

Type

Hydraulic, piston gauge
Pressure Range to 22,500 kPa / 3,000 psi (model dependent)
Accuracy (12 months) to ±0.050% rdg
Engineering Units psi, kg/cm2, bar, kPa
Repeatability ±0.005% rdg
Temperature coefficient ±0.00167% of rdg/°C (@23°C)
Increments  (low-min) 0.1 psi, 0.005 kg/cm2, 5 mbar, 0.5 kPa
(high-min) 0.5 psi, 0.025 kg/cm2, 25 mbar, 2.5 kPa
Gravity 9.80665 m/s2 (international standard) or Local gravity (specify when ordering)
Weight Sets Single (as ordered)
Piston/cylinders Single or dual, depending on model
Columns Single
Pressure Source Screwpump, hand-actuated, hydraulic pump (tester models only)
Medium AAA oil
Reservoir capacity 0.24 l /14.4 in3 (tester models only)
Wetting surfaces 300 series stainless steel, brass, aluminum
O-rings Buna N
Test Connections 1/4” NPT and 1/2” NPT
Weight Material Hard, non-magnetic alloy and aluminum
 
Specifications
HL-36

Basic model

Dual piston/cylinder assembly, imperial engineering units, ±0.100% accuracy, standard accessories, NIST traceable certificate

 

Operating Range

Increment

Piston Area

Weight Set

Accuracy

Gravity

Data

  10 to 200 psi 0.1 psi 0.05 in² 3 ±0.100% rdg (standard) Standard or local
gravity (specify)
No
50 to 1,000 psi 0.5 psi 0.01 in²
HL-270M-1/C

Basic model

Single piston/cylinder assembly, imperial engineering units, 0.100% accuracy, standard accessories, NIST traceable certificate
 

Operating Range

Increment

Piston Area

Weight Set

Accuracy

Gravity

Data

  1 to 45 kg/cm² 0.005 kg/cm² 0.05 in² 3M ±0.100% rdg (standard) Standard or local
gravity (specify)
Yes
5 to 225 kg/cm² 0.025 kg/cm² 0.01 in²
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Ordering Information
Model Description Buy Online Price
6151P Ametek HL36 Hydraulic Portable Deadweight Tester, 10 to 1000 psi Buy Now Sale $4,115.49
(Reg. $4,332.00)
HL270M Ametek HL-270-M-1/C Hydraulic Portable Deadweight Tester, 1 to 225 kg/cm2 Discontinued
Included Accessories
 
  • 1 - Weight Set with Case
  • 1 - Certificate of Calibration
  • 1 - Case
  • 1 - Instruction Manual
Included