Digital Hydraulic Multimeter

Flow, Pressure, Peak Pressure and Temperature

Power and Volumetric Efficiency

• Up to 800 1pm
• Up to 480 bar
• Bi-directional

The HFP1 Digital Hydraulic Multimeter is an all-in-one unit designed to test the performance of hydraulic pumps, motors, valves and hydrostatic transmissions.

The easy-to-use design allows the operator to just switch on and test, without complex setup or special training. The HFP measures flow, pressure and temperature. In addition, the HFP holds the peak pressure value as well as calculating hydraulic power and volumetric efficiency using the unique P-Q test button.

The HFP is the ideal tool for pinpointing hydraulic system faults, reducing downtime, and helping in preventative maintenance. The design builds on the very successful DHT range of portable testers with the addition of a large digital display and a built-in pressure transducer.

The turbine flow meter with built-in loading valve is bi-directional and specifically designed to enable the operator to simulate the maximum working pressure safely during normal machine operation.

The loading valve has safety discs built-in to protect the operator and the multimeter in the event of excessive pressure, allowing oil to bypass the loading valve INTERNALLY with no spillage of oil from the hydraulic circuit, eliminating any danger to the
operator or environmental hazards.

Features

• ACCURATE measurement of flow, pressure peak pressure and temperature
• AUTOMATIC calculation of hydraulic power and volumetric efficiency
• SAFE to use in both directions of flows. Internal oil by-pass protects multimeter and operator against overpressure.
• BI-DIRECTIONAL for unrestricted connection and simplified testing.
• FAST checks on pumps, motors, valves, cylinders, hydrostatic transmissions.
• EASY to operate controls. Connect into the hydraulic system and simply “Switch on”.
• PORTABLE AND LIGHTWEIGHT with angled case for easier viewing and cleaning.

Specifications

Model Flow Range Temperature Range Pressure Port Size

HFP1 10-400 1pm 0-120°C 0-420 bar (0-600 bar peak) 1”BSPF
HFP2 20-800Ipm 0-120°C 0-480 bar (0-600 bar peak) 1 7/8” UN
SAE

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.

Measurement and Indication Flow

Measured by the electronic count of an axial turbine designed to minimise pressure drop and the effects of viscosity. The BSP ported version of the HFP displays flow in 1pm.
Accuracy: 1% of indicated reading (IR)

Pressure and peak pressure

Measured using a built-in pressure transducer rated to 600 bar. 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: 0.5% of the indicated reading (IR)

Temperature

Sensed by a termistor built into the flow transducer to maximise contact with the oil flow and ensure fast response. The BSP ported version of the HFP displays temperature in °C.
Accuracy: ±°C

Power

Calculated from the flow and pressure, the hydraulic power is displayed in either HP of 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: 2% of indicated reading (IR)

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.
Accuracy: ±1% point

Construction Readout

The HFP is microprocessor based and has three screens that can be toggled by the operator. Flow, pressure, peak pressure and temperature are displayed simultaneously on screens one and two. Power can be displayed in place of temperature at the touch of a button. The three screens show: all digital values, digital values with a bar graph, and P-Q test.

The readout refreshes three times per second and uses low power circuitry to maximise battery life. The HFP has an auto power off feature that turns the unit off if unused for more than 20 minutes. The standard 9-volt battery enables more than 6 months normal testing time. The 9v (PP3, 64F22, 6AM6, A1604) battery is available worldwide.

Turbine Block

High tensile aluminium block houses a six blade turbine rotating on a stainless steel bearing and shaft. Built-in flow straighteners reduce flow turbulence and allows accurate flow measurement in both directions.

General Loading Valve

The integral loading valve allows progressive pressure loading in either flow direction. Safety discs relieve at 440 bar to internally by-pass the oil if the maximum pressure is exceeded. Safety discs with different pressure ranges up to 480 bar are available. Consult the sales office for details.

Seals

Viton seals compatible with oil, water/oil emulsion are fitted as standard. EP seals for phosphate-ester are available to special order.
Dimensions
HFP1: 240mm Wide, 205mm High, 180mm Deep, Mass 8kg.
HFP2: 255MM Wife, 215mm High, 205mm Deep, Mass 10kg.

Operators Manual

Full instructions are supplied with each tester

How to Order

Specify the HFP1, which is a 10 – 400 1pm unit with BSP ports and Metric engineering units.