Wire the 3-Wire Pt100
Connect the probe directly to analog input 1 using the documented ATR444 terminal assignment. The evidence identifies two red conductors and one white conductor; it does not state that the two red conductors are interchangeable, so preserve the specified terminal mapping.
| ATR444 terminal | Pt100 conductor |
|---|---|
| 16 | Red |
| 17 | White |
| 18 | Red |
Configure Analog Input 1
- Press FNC for 3 seconds.
- Enter password 1234, then press FNC to confirm.
- Use the arrow keys to select parameter group A1 – [A.in.1] – Analog input 1.
- Select parameter 1 [SEn.1] and press SET to enable editing.
- Use the arrow keys to select Pt100, then press SET to confirm.
- Press FNC once to return to parameter-group selection, then press it again to exit setup mode.
Adjust the Setpoints
Use the up and down arrow keys to change the main setpoint shown on display 2, the bottom row. If alarm or other setpoints are enabled, press SET to display them: display 1, the top row, shows the setpoint value, while display 2 identifies the setpoint type. Change the value on display 1 with the arrow keys.
Verify the Installation
Before placing the controller in service, compare all three conductors with the terminal table and reopen group A1 to confirm that [SEn.1] retained the Pt100 selection. The available evidence does not provide a resistance test, calibration tolerance, temperature range, or accuracy criterion, so verify measurement performance against the applicable ATR444 documentation and process requirements.
FAQ
Which ATR444 terminals connect to a 3-wire Pt100?
Connect the red conductors to terminals 16 and 18 and the white conductor to terminal 17, preserving that documented mapping.
Which ATR444 parameter selects a Pt100 sensor?
Open group A1, [A.in.1], and set parameter 1, [SEn.1], to Pt100.
How do I enter ATR444 configuration mode?
Hold FNC for 3 seconds, enter password 1234, and press FNC again to confirm.
