Basic Operation - OTC 4291 Manual Del Usuario

Basic operation

Temperature
The thermistor-type temperature transducer mounted within the flow meter is in contact with the oil flow, and
temperature is displayed on the left-hand side of the digital display. Temperature from the remote flow meter plugged
into the side of the unit is displayed in the INT and TACH position; temperature from a remote flow meter plugged into
the EXT socket on the front is displayed in the EXT position. Pressing the °C/°F button toggles the display between
Centigrade and Fahrenheit; the unit selected is indicated by a cursor arrow.
Flow Block
The flow comprises an axial turbine mounted in an aluminum 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 electric circuit. The circuit amplifies the pulse, shapes
it into square wave form and has a digital output which is directly proportional to the number of pulses per second.
Flow rate is displayed in the right-hand side of the digital display when INT or EXT are selected. Pressing the units
button switches the display to lpm, IMP gpm or US gpm and the selection is indicated by a cursor arrow. When the
flow rate falls below the minimum allowable, "L" is indicated on the display. When flow rate exceeds the maximum,
"H" is indicated on the display.
Loading Valve - 100 GPM Model only
All loading valves work on the same theory - a poppet is moved in and out of a flow port via a threaded shaft. The
unique design of the pressure-balanced poppet ensures low handle effort throughout the flow and pressure ranges
in addition to excellent tactile feedback, regardless of flow direction. In the event of overpressure, replaceable burst
discs (situated within the poppet) rupture, to internally bypass the oil at low pressure.
Accessories
OTC 4292 Digital Hydraulic Readout
OTC 573295 Flow/Temp/Pressure Cable/Hose Assembly 20 ft.
OTC 573296 Flow/Temp Cable Assembly 6-1/2 ft.
Replacement Parts
OTC 573749 Test Point
OTC 573736 Burst Disc Kit
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