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Model Number
Flow Range (lpm)
Pressure Range (bar)
Inlet/Outlet Ports
DHM404-B-6
10 - 400
0 - 420 (0 - 600 peak)
1” BSPP
DHM804-S-7-L
20 - 800
0 - 480 (0 - 600 peak)
1-7/8” -12UN #24 SAE ORB
Specification
EU (lpm/Centigrade)
US (gpm/Fahrenheit)
Flow
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
meter samples the pressure transducer 1000 times per second and updates the peak display
appropriately. 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.
Peak Pressure: capture rate = 1ms
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.
Data Recording: up to 12 sets of data points can be saved to internal memory
LCD Display: High contrast, fast response 4 line display. Update rates of measurements:
Digital values @1.4Hz
Analogue bars @ 14Hz
Peak Pressure capture @1ms
Battery Life: approximately 15 hours of normal use with high capacity Alkaline unit.
IP54 Internal Protection of electronic circuits.
iOS® App’
Application programs are only available for phones or tablets running iOS operating systems.
Handheld devices must support Bluetooth® Smart (v4.1) or greater.
Apple iOS v8.1 or higher.
NB. For Apple iPhone 5S upwards.
Model Number
Flow Range (gpm)
Pressure Range (psi)
Inlet/Outlet Ports
DHM404-S-6
2.5 - 100
0 - 6000 (0 - 8700 peak)
1-5/16” -12UN #16 SAE ORB
DHM804-S-7
5 - 210
0 - 7000 (0 - 8700 peak)
1-7/8” -12UN #24 SAE ORB
Visit the iTunes® store and download the Webtec Quick Cert App’ to your mobile device.
