Haltech F10X - Manual (Page 108)

F10X Manual
108
E.1.6 Checking the Sensor
If you need to check that the Haltech Hall Effect sensor is operating correctly, then this can
be done easily with the use of a multimeter, a magnet and a 1000 Ohm resistor . By powering
up the sensor, using 12 volts (PIN F) and ground (PIN A), and connecting the 1K Ohm
resistor between 12 volts (PIN F) and the Trigger channel (PIN B), we can be checked to
confirm correct operation.
12V
Trigger
1k Ohm
Resistor
Multimeter
Ground
Haltech
Hall-Effect
Sensor
Pin A
Pin B
Pin F
Connecting the multimeter between PIN B and ground, 12 volts should be present. When
magnet is placed in front of the sensor this value should go to 0 volts.
Fitting the magnets
We insist that only Haltech rare earth magnets (part number REM1) be used for the purpose
of triggering the sensor. Rare earth magnets purchased from your local electronics store may
be less expensive but they are not good enough! Haltech rare earth magnets are strong with
good stability to withstand reasonably high temperatures and give a long service life. Some
rare earth magnets are stronger but break down under excessive temperature, or are too brittle
for the purpose, or do not have a long service life. Ordinary magnets ie not rare earth types,
may not have the strength required for satisfactory triggering at high speeds.
Haltech REM1 rare earth magnets are normally 5mm dia x 2mm depth.
The magnets should be fitted in non-ferrous surrounds such as aluminium, stainless steel or
titanium. The trigger wheel is normally made of the chosen material but various users have
reported good results when the magnets are set in a suitable non-ferrous surround and the
surround is set into a ferrous material.
The magnets should be set flush with or slightly back from the surface of the trigger wheel or
surround. If set too far back the magnetic signal may be too weak. The magnets should be set
in place with a strong and durable fixing compound such as high strength epoxy, Loctite stud
locking compound eg 603, or JBweld. Some users rely only on the fixing compound but to
ensure that the magnets remain in place but many prefer that they be retained by mechanical
means such as peening, and this gives an added safety factor.