Revision 4.0
STT850 Series HART/DE Option User’s Manual
Page 67
Factory calibration can be specified when you order your Transmitter. Also, if precision equipment,
suitable environment, and required skill are available at your site, input calibration can be done
locally.
The procedure needs a precision Temperature source with an accuracy of 0.04% or better to do a
range calibration. Factory calibration of the STT850 Temperature Transmitter is accomplished with
inches-of- water ranges referenced to a temperature of 39.2 °F (4°C).
6.7 Input Calibration Procedures Description
The input calibration process consists of the following three parts:
Correcting the input LRV.
Correcting the input URV.
For the input calibration procedure, current loop component tolerances and values are
not critical if they support reliable communication between the Transmitter and the MC Toolkit.
Refer to the STT850 SmartLine Transmitter
User’s Manual, 34-TT-25-03.
For the input calibration procedures, connect the test setup illustrated in Figure 10. Either voltage
mode (Voltmeter across the resistor) or current mode (Ammeter in series with the resistor) is
satisfactory.
Figure 10
– Input Calibration Connections
