9
The Calc-An-Acre II
must be connected to a speed sensor to utilize its calculating function.
Several possible options are listed below:
ASTRO SERIES OR OTHER GPS SPEED SENSOR INTERFACES
The Calc-An-Acre II is designed to easily connect to the Micro-Trak Astro series speed sensor. It also may be used with most
GPS speed sensors that output a pulsed signal, such as the Squibb-Taylor
®
SkyTrak or Dickey-John
®
GPS speed sensors. An
adapter cable may be required.
MAGNETIC WHEEL SENSOR
This system uses magnets attached to a wheel hub or drive shaft and a hall-effect sensor. The movement of the magnets
near the sensor creates an electrical pulse which the console uses as a speed input. The system must be carefully calibrated
to ensure accurate readings.
VANSCO
™
RADAR SPEED SENSOR (AVAILABLE FROM MICRO-TRAK DEALERS & DISTRIBUTORS)
The Vansco radar speed sensor uses a microwave (radar) signal to deliver a reliable, accurate speed signal for electronic
equipment. It features state-of-the-art electronic design/manufacturing, rugged aluminum housing and complete testing
and certification.
RADAR INTERFACE
The Calc-An-Acre II may also be interfaced with most popular radar ground speed sensors. An adapter cable is re quired for
proper interface.
SEE Appendix B FOR LIST OF ADAPTER CABLES FOR RADAR.
PROXIMITY SENSOR - P/N 01554
The proximity sensor is useful in situations where it is impractical or inadvisable to
use other options. The P/N 01554 Proximity Sensor responds to the close presence of
ferrous metals and sends a signal to the console via Speed connection.
Typically it is
mounted near the teeth of sprocket using a recommended air gap of 1/16” (tip: use a
U.S. dime as a gauge).
To calibrate the system to use this sensor for speed use pg. 18 Fine Tuning Speed/
Distance.
Installation (cont.)
Speed Sensor Options
Astro Speed Sensor Installation
RECEIVER:
The GPS receiver may be mounted either externally (roof of the cab or other place
with a clear view of the sky) or inside the vehicle cab. However, if mounted inside the cab
there may be some loss of accuracy due to blockage of satellite signals. For most reliable
operation, mount the GPS receiver in a location where it has an unobstructed view of the sky.
Mount the receiver using the integral magnet or the included self-adhesive fastener tape. If
using the fastener tape - clean the mounting location, remove the plastic backing, and press
firmly to the surface.
WIRING:
Route the 10 foot cable from the receiver into the cab (if receiver is externally
mounted). Avoid sharp edges or heat sources. The rectangular module is roughly the same
size as the connector and will fit through the same opening.
MODULE:
The small potted module includes a power LED and a GPS status LED. The module can be mounted in a visible
location using the included self-adhesive fastener tape, or placed out of sight.
•
Power LED
(closest to connector) : On when 12VDC is connected
•
GPS Status LED
(closest to receiver): Flashes when the GPS receiver is active and scanning for a satellite. When a signal is found, it will
remain on. If the GPS system fails, the light will turn off.
CONSOLE CONNECTION:
Connect the short cable from the Astro to the 3-pin connector labeled SPEED on your console.
Summary of Contents for Calc-An-Acre II
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