Question about Milltronics BW500

IT sounds likethe optional mA board is alreadyin your unit/There is a parameter that defines the input as moisture compensation, so go for it!

Page 63:
(mA) Input
The optional mA I/O board provides two mA inputs, programmable as inputs 1 and 2. If
programmed for PID control, generally, input 1 is assigned to PID control loop 1 and input
2 is assigned to PID control loop 2.

The input range can be set to 0-20 mA or 4-20 mA (P250), and assigned a function (P255),
e.g. PID setpoint. The 4 and 20 mA levels can be trimmed (P261 and P262) to agree with an
external device. The external device could be a moisture sensor, or an inclinometer.

parameter: P255 (page 118):
P255 mA Input Function
Assigns the mA input function for the input selected, inputs 1 to 2 (P250 - 01 to - 02)
Entry:
0 = OFF
1 = PID setpoint
2 = PID process variable
3 = On-line calibration*
4 = Moisture compensation
5 = Incline compensation
* Valid only if On-line Calibration is turned on, (P355 = 1).

Moisture Compensation (page 55)
Moisture Compensation is used to compensate for the moisture component of the
material being weighed. It factors out the moisture component of load, rate and total for
all multispans selected. The factored value is meant to report the dry mean values of the
material being conveyed.

The BW500 receives the static load cell signal, and adjusts the value of the load being
displayed and integrated by the moisture percentage. The mA I/O card is required to
accept the mA signal from the Moisture Meter. This mA signal can represent 0 to 100%
moisture. The moisture percentage is displayed in P398-01. Using P398-02, the moisture
percentage can be represented as a percentage of mass to be deducted from the total
mass.

Example:
Setting P398-02 = 30% will allow the 4 - 20 mA input to correspond to 0 - 30% moisture.
The Zero and Span calibration is not affected by the presence of a moisture meter. It is
understood that the calibrations are performed using dry static weights.

The Moisture Meter must be connected to the appropriate mA input and programmed as
described in the following steps:
1. Enable mA input function for moisture compensation P255-01 or 02 = 4 (moisture
compensation).
2. Set appropriate mA input range P250-01 or 02 = 2 (default is 4 - 20 mA).
3. Set mA input moisture ratio P398-02 = 100% (default).
4. Observe moisture percentage using P398-01.