Density / Relative Density of Light Hydrocarbons - Constant Temperature Water Bath

Density and relative density measurements of light hydrocarbons, including LPG, are used for transportation, storage and regulatory purposes. The measurement is made by floating a thermohydrometer in a sample that has been introduced into a pressure cylinder.

  • Conforms to ASTM D1657 and related specifications
  • Built-in safety relief valve
  • Safety relief valve: 200psi (1.4MPa)
  • Mechanically refrigerated for convenient sub-ambient temperature operation

Pressure Hydrometer Cylinder - Transparent plastic cylinder mounted between machined aluminum end plates and surrounded by stainless steel safety guard. Use together with ASTM 310H Thermohydrometer to determine density or relative density of LPG and light hydrocarbons. Equipped with inlet, outlet and vapor vent valves for admitting sample and purging cylinder. End plates have positive sealing buna-N O-rings and are joined by sturdy steel support rods. Top plate detaches easily without tools for insertion or removal of thermohydrometer. Safety relief valve prevents unsafe pressure build-up inside cylinder. Mounted on a finished steel base. 

Constant Temperature Water Bath - Immerses two Pressure Hydrometer Cylinders at 60°F (15°C) for density and relative density determinations of LPG and other light hydrocarbons. Mechanically refrigerated cooling system maintains sub-ambient temperature. Thermistor activated solid state temperature controller and 750W copper immersion heater maintain bath temperature with ±0.5°F (±0.2°C) stability. A 1⁄20 hp ball bearing stirrer circulates the bath medium to assure temperature uniformity. Stainless steel tank is fiberglass insulated. Equipped with overflow standpipe/drain. Steel exterior has a durable polyurethane enamel finish.

Conforms to the specifications of: ASTM D1657; IP 235; ISO 3993 

Controller Sensitivity: ±0.5°F (±0.2°C)

Capacity: Two (2) K26150 cylinders

115V 60Hz, Single Phase, 12.5A
220-240V 50 or 60Hz, Single Phase, 6.4A


Bath interior: 12x18x22(30x46x56)
Overall: 18x20x49 (46x51x124)


Pressure Hydrometer Cylinder: 8 1⁄4x23 3⁄4 (21x60)

Net Weight: 

Overall: 158 lbs (71.7kg)
Pressure Hydrometer Cylinder: 5 lbs (2.3kg)

Shipping Weight: 194 lbs (88.0 kg)

Dimensions: 30x24x53 in. (76.2x61.0x134.6 cm)"

  • K26150 Pressure Hydrometer Cylinder
  • 251-000-001 ASTM 101H Thermohydrometer

                Nominal Relative Density Range: 0.500 to 0.650
                Standard Temperature, °F: 60/60
                Temperature Range, °F: 30 to 90

  • 251-000-004 ASTM 310H Thermohydrometer

                Density Range kg/m3: 500-650
                Standard Temperature, °C: 15
                Temperature Range, °C: 0 to 35

  • 250-000-12F ASTM 12F Thermometer. Range –5 to +215°F
  • 250-000-12C ASTM 12C Thermometer. Range –20 to +102°C