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 Number Cylinder Part Number Maximum Pressure Minimum Pressure (Tare) Nominal Piston Diameter Nominal Piston Area Nominal Area Uncertainty
B-3497 B-3498 20,000 psi 200 psi 0.079788″ 0.005 in2 0.0125%
B-3500 B-3501 12,000 psi 120 psi 0.103006″ 0.00833 in2 0.0097%
B-3502 B-3503 10,000 psi 100 psi 0.112838″ 0.01 in2 0.0089%
B-3504 B-3505 6,000 psi 60 psi 0.145673″ 0.0166 in2 0.0069%
B-3506 B-3507 5,000 psi 50 psi 0.159577″ 0.02 in2 0.0063%
B-3508 B-3509 4,000 psi 40 psi 0.178412″ 0.025 in2 0.0056%
B-3510 B-3511 2,000 psi 20 psi 0.252313″ 0.05 in2 0.004%
B-3512 B-3513 1,000 psi 10 psi 0.356825″ 0.1 in2 0.0028%
Supplied weights: (3) 20 lb, (3) 10 lb, (1) 5 lb, (4) 1 lb, and (1) 1 lb tare weight.

DWT-75

Piston Part Number Cylinder Part Number Maximum Pressure Minimum Pressure (Tare) Nominal Piston Diameter Nominal Piston Area Nominal Area Uncertainty
B-3497 B-3498 15,000 psi 200 psi 0.079788″ 0.005 in2 0.0125%
B-3500 B-3501 9,000 psi 120 psi 0.103006″ 0.00833 in2 0.0097%
B-3502 B-3503 7,500 psi 100 psi 0.112838″ 0.01 in2 0.0089%
B-3504 B-3505 4,500 psi 60 psi 0.145673″ 0.0166 in2 0.0069%
B-3506 B-3507 3,750 psi 50 psi 0.159577″ 0.02 in2 0.0063%
B-3508 B-3509 3,000 psi 40 psi 0.178412″ 0.025 in2 0.0056%
B-3510 B-3511 1,500 psi 20 psi 0.252313″ 0.05 in2 0.004%
B-3512 B-3513 750 psi 10 psi 0.356825″ 0.1 in2 0.0028%
Supplied weights: (2) 20 lb, (2) 10 lb, (2) 5 lb, (4) 1 lb, and (1) 1 lb tare weight.

DWT-50

PISTON PART NUMBER CYLINDER PART NUMBER MAXIMUM PRESSURE MINIMUM PRESSURE (TARE) NOMINAL PISTON DIAMETER NOMINAL PISTON AREA NOMINAL AREA UNCERTAINTY
B-3497 B-3498 10,000 psi 200 psi 0.079788″ 0.005 in2 0.0125%
B-3500 B-3501 6,000 psi 120 psi 0.103006″ 0.00833 in2 0.0097%
B-3502 B-3503 5,000 psi 100 psi 0.112838″ 0.01 in2 0.0089%
B-3504 B-3505 3,000 psi 60 psi 0.145673″ 0.0166 in2 0.0069%
B-3506 B-3507 2,500 psi 50 psi 0.159577″ 0.02 in2 0.0063%
B-3508 B-3509 2,000 psi 40 psi 0.178412″ 0.025 in2 0.0056%
B-3510 B-3511 1,000 psi 20 psi 0.252313″ 0.05 in2 0.004%
B-3512 B-3513 500 psi 10 psi 0.356825″ 0.1 in2 0.0028%
Supplied weights: (1) 20 lb, (2) 10 lb, (1) 5 lb, and (1) 1 lb tare weight.

DWT-45 KG

PISTON PART NUMBER CYLINDER PART NUMBER MAXIMUM PRESSURE MINIMUMJ PRESSURE (TARE) NOMINAL PISTON DIAMETER NOMINAL PISTON AREA NOMINAL AREA UNCERTAINTY
B-6973 B-6974 1350 kg/cm2 15 kg/cm2 0.206012 cm 1/30 cm2 0.0123%
B-6975 B-6976 1125 kg/cm2 12.5 kg/cm2 0.225676 cm 0.04 cm2 0.0113%
B-6977 B-6978 900 kg/cm2 10 kg/cm2 0.252313 cm 0.05 cm2 0.0101%
B-6979 B-6980 675 kg/cm2 7.5 kg/cm2 0.291346 cm 1/60 cm2 0.0087%
B-6981 B-6982 450 kg/cm2 5 kg/cm2 0.356824 cm 0.1 cm2 0.0071%
B-6983 B-6984 225 kg/cm2 2.5 kg/cm2 0.504627 cm 0.2 cm2 0.005%
B-6985 B-6986 90 kg/cm2 1 kg/cm2 0.797885 cm 0.5 cm2 0.0032%
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 NUMBER CYLINDER PART NUMBER MAXIMUM PRESSURE MINIMUM PRESSURE (TARE) NOMINAL PISTON DIAMETER NOMINAL PISTON AREA NOMINAL AREA UNCERTAINTY
B-6973 B-6974 1050 kg/cm2 15 kg/cm2 0.206012 cm 1/30 cm2 0.0123%
B-6975 B-6976 875 kg/cm2 12.5 kg/cm2 0.225676 cm 0.04 cm2 0.0113%
B-6977 B-6978 700 kg/cm2 10 kg/cm2 0.252313 cm 0.05 cm2 0.0101%
B-6979 B-6980 525 kg/cm2 7.5 kg/cm2 0.291346 cm 1/60 cm2 0.0087%
B-6981 B-6982 350 kg/cm2 5 kg/cm2 0.356824 cm 0.1 cm2 0.0071%
B-6983 B-6984 175 kg/cm2 2.5 kg/cm2 0.504627 cm 0.2 cm2 0.005%
B-6985 B-6986 70 kg/cm2 1 kg/cm2 0.797885 cm 0.5 cm2 0.0032%
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 NUMBER CYLINDER PART NUMBER MAXIMUM PRESSURE MINIMUM PRESSURE (TARE) NOMINAL PISTON DIAMETER NOMINAL PISTON AREA NOMOINAL AREA UNCERTAINTY
B-6973 B-6974 750 kg/cm2 15 kg/cm2 0.206012 cm 1/30 cm2 0.0123%
B-6975 B-6976 625 kg/cm2 12.5 kg/cm2 0.225676 cm 0.04 cm2 0.0113%
B-6977 B-6978 500 kg/cm2 10 kg/cm2 0.252313 cm 0.05 cm2 0.0101%
B-6979 B-6980 375 kg/cm2 7.5 kg/cm2 0.291346 cm 1/60 cm2 0.0087%
B-6981 B-6982 250 kg/cm2 5 kg/cm2 0.356824 cm 0.1 cm2 0.0071%
B-6983 B-6984 125 kg/cm2 2.5 kg/cm2 0.504627 cm 0.2 cm2 0.005%
B-6985 B-6986 50 kg/cm2 1 kg/cm2 0.797885 cm 0.5 cm2 0.0032%
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.