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Model Flow Range Pressure Range Temperature Inlet/Outlet
Number (gpm) (psi) Range (°F) Ports
DHM403-S-6 4 - 100 0 - 6000 (0 - 8700 peak) 32 - 250 1-5/16 UN -12 #16 ORB
DHM803-S-7 7 - 210 0 - 7000 (0 - 8700 peak) 32 - 250 1-7/8" UN-12 #24 ORB
Model Flow Range Pressure Range Temperature Inlet/Outlet
N
umber (lpm) (bar) Range (°C) Ports
DHM403-B-6 10 - 400 0 - 420 (0 - 600 peak) 0 - 120 1” BSPF
DHM803-S-7 20 - 800 0 - 480 (0 - 600 peak) 0 - 120 1 7/8” - 12 UN
Specification
EU Specification
US Specification
Connections
Flow block connection by flexible hoses 1 - 2 metres (3 - 6ft) long.
Adaptors
Adaptor Fitting kits and flanges are available to suit the range of flow blocks. Consult the sales office.
Flow
Measured by the electronic count of an axial turbine designed to minimise pressure drop and the
effects of viscosity. The EU version displays flow in lpm, the US version displays flow in gpm.
Accuracy: ± 1% of indicated reading (over 15 - 100% of range).
Pressure and peak pressure
Measured using a built-in pressure transducer rated to 600 bar / 8700 psi. The transducer has a
typical response time of <1 ms to enable the accurate capture of peak pressures. The engineering
units for pressure can be changed using the ‘pressure units’ button on the front panel. Standard units
are ‘BAR, PSI, MPA, KSC’.
Accuracy: Pressure 0.5% FSD, Peak 1% FSD.
Temperature
Sensed by a thermistor built into the flow transducer to maximise contact with the oil flow and ensure
fast response. The EU version displays temperature in °C, the US version displays temperature in °F.
Accuracy: ± 1°C, 2°F.
Power
Calculated from the flow and pressure, the hydraulic power is displayed in either HP or KW. The
engineering units for power are linked to the pressure units and can be changed using the ‘pressure
units’ button on the front panel.
Accuracy: ± 3 kW / 4 HP (≤ 100 kW / 134 HP), ± 5 kW / 6.7 HP (> 100 kW / 134 HP).
Volumetric efficiency
Calculated as a ratio of the flow at high pressure to the flow under reference conditions. Volumetric
Efficiency is expressed as a percentage, at constant rpm.
Accuracy: ± 1% point.
Seals
Viton seals compatible with oil, water/oil emulsion are fitted as standard. EP seals for phosphate-
ester are available to special order.
Dimensions (Millimetres)
D
HM403: 240 Wide, 200 Deep, 200 High
W
eight: Unpacked 6.5 kg, Shipped 7 kg (Approx.)
DHM803: 245 Wide, 225 Deep, 225 High
Weight: Unpacked 10 kg, Shipped 11 kg (Approx.)
Dimensions (Inch)
DHM403: 9.45" W, 7.87" D, 7.87" H
Weight: Unpacked 14.33 lb
Shipped approximately 15.4 lb
DHM803: 9.65" W, 8.86" D, 8.86" H
Weight: Unpacked 22 lb
Shipped approximately 24.2 lb
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