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Idiomas disponibles
Idiomas disponibles
Principles of 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 meter
The flow meter comprises an axial turbine mounted in an aluminium 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.
Flowrate 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 flowrate exceeds the maximum "H" is indicated on the display.
Tachometer
An optional handheld infra-red tachometer is available. RPM is displayed in the right hand
side of the digital display when "TACH" is selected on the rotary switch. Pressing the units
button switches to RPM or RPM/N indication. RPM assumes the sensor provides one pulse
per revolution of the shaft. RPM/N assumes the sensor provides N pulses each revolution of
the shaft. (See section on Tacho Generator) The value of N can be varied (See section on
programming).
Pressure Gauge
The pressure gauge has a spiral Bourdon tube and the gauge case is filled with glycerine to
ensure good dampening on pulsating pressures. The gauge is connected to the flow meter via
a micro-bore hose.
Fast Button
The fast button changes the update time of the display. In some situations quick response to
flowrate changes is required. With the cursor arrow highlighting the fast position, the update
time is approximately 1/3 second. Otherwise the update time is approximately 1 second. When
using the fast update, the display will be less stable on flow and shaft speed.
ON Button
The unit is designed to turn off automatically after approximately 15 minutes to conserve power.
When this occurs user programmed values are retained in the memory. The unit is restarted
by pressing the "ON" button.
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