DH SERIES - Hall Effect Sensors

AI-Tek has taken its years of experience of
designing and manufacturing Hall Effect sensors
for harsh applications and has developed a line
of durable products for industrial, rail,
military and automotive use.

The new Al-TEK DH series sensors are differential
based, zero-speed, precision, single channel,
speed sensors. At power-up, they calibrate
themselves to the unique magnetic signature
of their installed application and continue
to update the cali- bration as the sensor is
running. This unique combination of
differential sensing technology and
calibration make these sensors highly
tolerant of installation mis-alignment,
target geometry and composition, target
run-out, vibration and air gap changes.

In comparison, the RH series are single-element based, zero speed, single
channel speed sensors and are an excellent choice for general purpose speed
sensing. Unlike the DH series that requires rotational alignment at installation,
the RH requires no alignment. Air gap adjustment is precise and easy and similar
to a VR type sensor.

The new DH sensor can sense each change in target movement, regardless of
speed, from near zero to 15 kHz frequency range, generating a steady pulse train
of frequency proportional to target speed. Typically, each time a gear tooth
(or any ferrous discontinuity) passes in front of the sensor the output changes
state. This type of sensor is known as a "P" type because it uses N-P-N transistor
logic (as opposed to "N" type, which uses P-N-P transistor logic).

Key Features:

• Reverse voltage protection, up to -30 Vdc, to prevent damage if miswired
• High temperature range of -40¡C to +125¡C
• Wide range of supply voltage in single design of 4.5 - 24 Vdc
• Two output options of Supply Tracking or TTL Compatible
• Rugged design meeting IEC 77 Standards (European Railroad Applications)
• Require special alignment
• Improved duty cycle
• Improved fine pitch performance
• Increased air gaps

Suitable for 32 diametral pitch or coarser gear (target), the standard catalog sensors
are easily applied to your various sensing needs. If you have a unique, special
requirement which cannot be met with any of the standard options, we will gladly review
your specs and work with you on a special sensor design.