Bench Model Primary Pressure Balance Standards

Harwood offers 6 different bench model primary pressure balance standards. Each bench model has a number of piston-cylinder assemblies available, allowing for a variety of pressure outputs using the same weights. Replacement piston-cylinder assemblies are available for all models. Pistons and cylinders are not interchangeable and cannot be sold separately due the exacting tolerances required in machining.

 

DWT-100

Piston Part NumberCylinder Part NumberMaximum PressureMinimum Pressure (Tare)Nominal Piston DiameterNominal Piston AreaNominal Area Uncertainty
B-3497B-349820,000 psi200 psi0.079788″0.005 in20.0125%
B-3500B-350112,000 psi120 psi0.103006″0.00833 in20.0097%
B-3502B-350310,000 psi100 psi0.112838″0.01 in20.0089%
B-3504B-35056,000 psi60 psi0.145673″0.0166 in20.0069%
B-3506B-35075,000 psi50 psi0.159577″0.02 in20.0063%
B-3508B-35094,000 psi40 psi0.178412″0.025 in20.0056%
B-3510B-35112,000 psi20 psi0.252313″0.05 in20.004%
B-3512B-35131,000 psi10 psi0.356825″0.1 in20.0028%
Supplied weights: (3) 20 lb, (3) 10 lb, (1) 5 lb, (4) 1 lb, and (1) 1 lb tare weight.

DWT-75

Piston Part NumberCylinder Part NumberMaximum PressureMinimum Pressure (Tare)Nominal Piston DiameterNominal Piston AreaNominal Area Uncertainty
B-3497B-349815,000 psi200 psi0.079788″0.005 in20.0125%
B-3500B-35019,000 psi120 psi0.103006″0.00833 in20.0097%
B-3502B-35037,500 psi100 psi0.112838″0.01 in20.0089%
B-3504B-35054,500 psi60 psi0.145673″0.0166 in20.0069%
B-3506B-35073,750 psi50 psi0.159577″0.02 in20.0063%
B-3508B-35093,000 psi40 psi0.178412″0.025 in20.0056%
B-3510B-35111,500 psi20 psi0.252313″0.05 in20.004%
B-3512B-3513750 psi10 psi0.356825″0.1 in20.0028%
Supplied weights: (2) 20 lb, (2) 10 lb, (2) 5 lb, (4) 1 lb, and (1) 1 lb tare weight.

DWT-50

PISTON PART NUMBERCYLINDER PART NUMBERMAXIMUM PRESSUREMINIMUM PRESSURE (TARE)NOMINAL PISTON DIAMETERNOMINAL PISTON AREANOMINAL AREA UNCERTAINTY
B-3497B-349810,000 psi200 psi0.079788″0.005 in20.0125%
B-3500B-35016,000 psi120 psi0.103006″0.00833 in20.0097%
B-3502B-35035,000 psi100 psi0.112838″0.01 in20.0089%
B-3504B-35053,000 psi60 psi0.145673″0.0166 in20.0069%
B-3506B-35072,500 psi50 psi0.159577″0.02 in20.0063%
B-3508B-35092,000 psi40 psi0.178412″0.025 in20.0056%
B-3510B-35111,000 psi20 psi0.252313″0.05 in20.004%
B-3512B-3513500 psi10 psi0.356825″0.1 in20.0028%
Supplied weights: (1) 20 lb, (2) 10 lb, (1) 5 lb, and (1) 1 lb tare weight.

DWT-45 KG

PISTON PART NUMBERCYLINDER PART NUMBERMAXIMUM PRESSUREMINIMUMJ PRESSURE (TARE)NOMINAL PISTON DIAMETERNOMINAL PISTON AREANOMINAL AREA UNCERTAINTY
B-6973B-69741350 kg/cm215 kg/cm20.206012 cm1/30 cm20.0123%
B-6975B-69761125 kg/cm212.5 kg/cm20.225676 cm0.04 cm20.0113%
B-6977B-6978900 kg/cm210 kg/cm20.252313 cm0.05 cm20.0101%
B-6979B-6980675 kg/cm27.5 kg/cm20.291346 cm1/60 cm20.0087%
B-6981B-6982450 kg/cm25 kg/cm20.356824 cm0.1 cm20.0071%
B-6983B-6984225 kg/cm22.5 kg/cm20.504627 cm0.2 cm20.005%
B-6985B-698690 kg/cm21 kg/cm20.797885 cm0.5 cm20.0032%
Supplied weights: (3) 10 kg, (2) 5 kg, (2) 2 kg, (1) 1 kg, (1) 0.5 kg, (2) 0.2 kg, (1) 0.1 kg, and (1) 0.5 kg tare weight.

DWT-35 KG

PISTON PART NUMBERCYLINDER PART NUMBERMAXIMUM PRESSUREMINIMUM PRESSURE (TARE)NOMINAL PISTON DIAMETERNOMINAL PISTON AREANOMINAL AREA UNCERTAINTY
B-6973B-69741050 kg/cm215 kg/cm20.206012 cm1/30 cm20.0123%
B-6975B-6976875 kg/cm212.5 kg/cm20.225676 cm0.04 cm20.0113%
B-6977B-6978700 kg/cm210 kg/cm20.252313 cm0.05 cm20.0101%
B-6979B-6980525 kg/cm27.5 kg/cm20.291346 cm1/60 cm20.0087%
B-6981B-6982350 kg/cm25 kg/cm20.356824 cm0.1 cm20.0071%
B-6983B-6984175 kg/cm22.5 kg/cm20.504627 cm0.2 cm20.005%
B-6985B-698670 kg/cm21 kg/cm20.797885 cm0.5 cm20.0032%
Supplied weights: (2) 10 kg, (2) 5 kg, (2) 2 kg, (1) 1 kg, (1) 0.5 kg, (2) 0.2 kg, (1) 0.1 kg, and (1) 0.5 kg tare weight.

DWT-25 KG

PISTON PART NUMBERCYLINDER PART NUMBERMAXIMUM PRESSUREMINIMUM PRESSURE (TARE)NOMINAL PISTON DIAMETERNOMINAL PISTON AREANOMOINAL AREA UNCERTAINTY
B-6973B-6974750 kg/cm215 kg/cm20.206012 cm1/30 cm20.0123%
B-6975B-6976625 kg/cm212.5 kg/cm20.225676 cm0.04 cm20.0113%
B-6977B-6978500 kg/cm210 kg/cm20.252313 cm0.05 cm20.0101%
B-6979B-6980375 kg/cm27.5 kg/cm20.291346 cm1/60 cm20.0087%
B-6981B-6982250 kg/cm25 kg/cm20.356824 cm0.1 cm20.0071%
B-6983B-6984125 kg/cm22.5 kg/cm20.504627 cm0.2 cm20.005%
B-6985B-698650 kg/cm21 kg/cm20.797885 cm0.5 cm20.0032%
Supplied weights: (1) 10 kg, (2) 5 kg, (2) 2 kg, (1) 1 kg, (1) 0.5 kg, (2) 0.2 kg, (1) 0.1 kg, and (1) 0.5 kg tare weight.