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Table of Contents
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Summary of Contents for OTC 4278
- Page 1 4278 100 GPM Hydraulic Flow Meter User Manual...
- Page 2 Introduction The OTC 4278 Hydraulic Flow Meter has been designed for easy connection to a hydraulic circuit so that flow, pressure and temperature can be readily checked. The Flow Meter can take full back pressure up to 6000 psi (420 bar), and the built-in loading valve enables many of the operating conditions to be simulated.
- Page 3 Basic operation Flow measurement The unit measures flow using an axial turbine mounted in the aluminum base block. The oil flow rotates the turbine and its speed is proportional to the oil velocity. The revolutions of the turbine are measured by means of a magnetic sensing head which feeds a pulse every time a turbine blade goes by to an electronic circuit.
- Page 4 General Operation All tests should be performed by suitably qualified personnel. 1. Connect the unit to the circuit (see previous page for installation guidance). 2. Ensure the pressure loading valve is fully opened by turning the knob counterclockwise. 3. Switch the unit on. If the display flashes, then the battery needs replacing. 4.
- Page 5 Model Number Flow Range Pressure Range Inlet/Outlet Ports 2.5 - 100 gpm 0 - 6000 psi 4278 1-5/16” -12UN #16 SAE ORB (10 - 400 lpm) (0 - 420 bar) * per J518 SAE Code 61 standard Ambient temperature: 41 - 104°F (5 to 40°C)
- Page 6 OTC 4278 Hydraulic Flow Meter Digital display Pressure gauge On/Off switch Battery cover...
- Page 7 Maintenance and service Battery replacement Turn the unit off. Loosen the two screws on either end of the battery cover. Note: They are captive screws. Carefully remove battery and disconnect. Connect new battery (See page 4 for details), place in unit and replace battery cover. Note: Only replace with similar size and type of battery.
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