Often, sensors only have two wires. Use the 3WHB10K as a fixed, known resistor to measure them.
Wire a jumper between the H and L terminals on the 3WHB10K to allow the sensor to receive
excitation voltage. Without the jumper, the sensor will not function. See
When using a 2-wire sensor with the 3WHB10K, use the
BrHalf()
(or
CDM_BrHalf()
)
instruction in place of the
BrHalf3W()
(or
CDM_BrHalf3W()
) instruction. The parameters of
the
BrHalf3W()
and
BrHalf()
instructions are identical; so, only the instruction name
needs to be changed in the
(p. 4) example programs.
FIGURE 3-1. 3-wire half bridge used to measure PRT
The terminal spacing of the GRANITE 6 and GRANITE analog input module is different than
other data loggers. The terminal input modules are still compatible, but the pins must be gently
bent inward a small amount to allow the terminal input module to be mounted.
It is still possible to use terminal input modules in adjacent terminal blocks if the modules are
staggered. This is done by gently bending one module forward and the next terminal backward
enough to clear the first module. Continue to alternate the modules as needed.
3WHB10K 3-Wire Half Bridge Terminal Input Module
3
