Honeywell STT25D, Operator'S Manual

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8 Smart Temperature Transmitter STT250 – Operator Manual
R T D
2 wires RTD
or 2 wires ohm
3 wires RTD
or 3 wires ohm
4 wires RTD
or 4 wires ohm
RTD RTD
Single T/C and mV
White
White
Red
Red
White
Red
Red
White
Red
2 wires
4 wires
Potentiometer wiring
3 wires
46188466-201
Figure 3: Output Sensor Wiring Connections
4.4 Grounding and Shielding Techniques
The current output signal will operate in either a floating or grounded system. If the
signal appears noisy or erratic, it is recommended to ground the loop at the negative
terminal of the power supply.
Shielding should only be connected to ground at one point to avoid ground loops.
4.5 STT250 Configuration
NOTE: If the transmitter is Model STT25D and configured for digital DE output,
the DVM will not display the output during the bench check. The output can be
changed to 4-20 mA analog for calibration checks. Remember to change the
mode back to digital DE at the completion of the check.
4.5.1 Analog Output Configuration (based on STS103)
1. Turn on the power supply and the SFC. On power up, the SFC will display " Self
Check " for a few seconds, verify proper operation and display " put loop in
manual ".
2. Press ID button. The transmitter will respond with a display of its name, typically
"
STT TagNo XXXXXXXX ". " STT " cannot be changed since it identifies the type of
transmitter. The current name XXXXXXXX has a cursor under the first letter
showing that it can be changed to an 8 character alpha-numeric tag number by
using number and letter keys.