Revision 4 STT750 Temperature Transmitter User’s Manual Page 27
4.3. Three Button Operation with no Display Installed
When there is no Display installed, the buttons can be used to perform a Zero or Span adjustment of
the Transmitter. Caution should be taken to insure these adjustments are only made when the correct
input values are applied.
4.3.1. Zero Adjustment
This adjustment is the same as performing a Set LRV using the Display.
1. Connect a current meter or voltmeter as shown in Figure 14 to monitor the PV output of the
Transmitter.
2. Using an accurate input source, apply a signal equivalent to the Transmitter LRV.
3. Press the Down (↓ ) and Zero ( ) buttons together to set the Zero.
4. Verify that the output is now 4 mA.
4.3.2. Span Adjustment
This adjustment is the same as performing a Set URV using the Display.
1. Connect a current meter or voltmeter as shown in Figure 14 to monitor the PV output of the
Transmitter.
2. Using an accurate input source, apply a signal equivalent to the desired Upper Range Value
of the transmitter.
3. Press the Down (↓) and Span ( ) buttons together to set the span.
4. Verify that the PV output is now 20 mA.
You can also use the MCT 202 and MCT404 Toolkit to make any adjustments to an
STT750 SmartLine Temperature Transmitter.
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