5
TYPES OF SENSORS TO BE TESTED
The HT101S is designed to be compatible with any sensor on any machine. In some cases special cabling is needed.
These sensors require in some cases, very specific operating voltages. Sensors generally fall into two groups; DIGITAL
and ANALOG.
DIGITAL sensors generate PULSES which vary in FREQUENCY as changes occur.
Shaft Speed sensors are used in many applications from Dry Product Applicators
to Planters. They will generate a certain number of “pulses per revolution”. The
RAVEN sensor to the right generated 180 pulses per revolution. Others might
generate 60 or 360 pulses in a single revolution. This is the reference point for
the display. Cutting the pulses in half tells the console the shaft is running at half
speed. Doubling the pulses indicates double the speed. “Pulses per revolution” is
the calibration reference the display requires.
Flow Meters generate pulses reflecting the amount
of flow currently running through the meter. A
calibration Tag is generally attached and indicates
the “Pulses Per Gallon” generated by the sensor. This RAVEN Flowmeter has a
tag showing 730 which in the case of RAVEN indicate 73 pulses generated per gallon of liquid flow. The generated pulses
are linear in their output meaning, doubling the pulses means double the gallons.
ANALOG sensors have signals that vary in VOLTAGE as changes occur.
The graph to the left shows how a 100 pound pressure
sensor varies in voltage generated as the pressure
changes. Zero pounds of pressure is indicated with a
voltage generated of zero. At 100 pounds of pressure the
signal voltage is at 100. The sensor responds in a linear
fashion. 50 pounds is then indicated by a 2.5 volt signal.
A zero to 3000 pound pressure found in hydraulic systems
will also respond in a linear way with zero volts indicating zero pressure and a 5 volt
signal is generated at 3000 pounds.
Another analog sensor might be a POSITION SENSOR used to indicate the steering position on a GPS Auto-Steer System.
Hitch position sensors are also this type. Movement is indicated by a linear change in voltage.
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