Page 112 SMV800 Modbus User's Guide Revision 1.0
3.2.10. Implementing calibration
Each process variable in the SMV800 Modbus device (diffrential Pressure [DP],
static pressure[SP], and process temperature[PT]) can be calibrated through a trim
process, either a zero trim or two-point trim. The lower trim value acts the same as
zero trim. The upper trim serves to adjust the span (or slope) of the device. The trim
value should be written to the appropriate Floating Point Registers in Table 3-5.
For accurate calibration, the user should be prompted to wait for the process variable
to stabilize before attempting to trim the transmitter. For best result, a Lower Trim
should be completed before attempting the Upper Trim.
Refer section 4.1 on Calibration for more information.
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