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.

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