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3.10: Setting Zero & Span
Position (Analog LDTs Only)
The 952A-V LDT generates a voltage output based
on position. The 952A BlueOx with analog output
offers 16 bits of resolution and is fully programmable
over the entire active stroke length of the LDT. Keep
in mind that there is a 2” Null area at the connector
end of the LDT and a 2.5” Dead area at the other
end of the LDT that the magnet must stay out of at
all times. The units come fully programmed from the
factory and do not require re-programming unless
desired. The analog units are 100% absolute and
will not lose programmed parameters on power loss.
To set the ZERO and SPAN position for the LDT
follow these steps:
1. Apply power to the LDT.
2. Place magnet assembly where ZERO is to be
located, but within the active region of the probe.
3. Momentarily short the program input pin to the
power supply common.
4. Place magnet assembly where SPAN is to be
located, but within the active region of the probe.
5. Momentarily short the program input pin to the
power pin (the maximum
distance must be within the active stroke range).
This completes the programming process.
3.11: Differential Analog Output
(Options D0, D1 or D2)
The 952A analog LDT’s are available with an
optional differential analog output. This feature is
hardware specific and must be specified at time of
order. The differential feature allows the distance
between two magnets to be measured. The
magnets must remain within the active stroke range
at all times and cannot be any closer than 2.5” to
each other. Keep in mind that there is a 2” Null area
at the connector end of the LDT and a 2.5” Dead
area at the other end of the LDT that the magnet
must stay out of at all times. The units come fully
programmed from the factory and do not require
re-programming unless desired. The analog units
are 100% absolute and will not lose programmed
parameters on power loss.
The differential feature is user programmable for
ZERO and SPAN dimensions and can programmed
anywhere within the active stroke range. The zero
can either be programmed for fully open or closed.
To set the ZERO and SPAN position for the probe
follow these steps:
1. Apply power to the probe.
2. Move the magnets to the desired minimum
(ZERO) setting, but within the active region of
the probe.
3. Momentarily short the program input pin to the
power supply common.
4. Move the magnets to the desired maximum
(SPAN) setting, but within the active region of
the probe.
5. Momentarily short the program input pin to the
power pin (the maximum
distance must be within the active stroke range).
This completes the programming process.
NOTE:
The maximum programmmable stroke
range on units with the differential analog output is
2.5” less than the active stroke. Refer to your part
number label or Chapter 1 for active stroke range.
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