How to Set Decimal Point and Change Input Type to PT100 on the TCN5 Temperature Controller

Introduction

The TCN5 temperature controller provides a flexible interface that allows users to customize how values are displayed and which sensor type is used. In this guide, you will learn how to:

• Adjust the decimal point position (0 / 0.0)
  
• Change the input type from thermocouple to PT100
  

Why These Settings Matter

✅ Decimal Point Adjustment
Precise control requires the right resolution. You may choose:

• 0: Integer display (e.g., 120)
  
• 0.0: One decimal (e.g., 120.5)
  

✅ Sensor Input Type (e.g., PT100)
If you're using a PT100 platinum RTD sensor, the controller must be set to accept PT input. Otherwise, temperature readings will be inaccurate or fail to register.

Watch the full tutorial

Step-by-Step Instructions

Step 1: Enter Parameter Setting Mode

• Press and hold SET for 3 seconds until parameter codes appear.
  

Step 2: Set Decimal Point

• Scroll to the dp parameter.
  

Choose:

• 0000: No decimal
  
• 0001: One decimal
  

Press SET to save.

Step 3: Change Input Type to PT100

• Scroll to the parameter labeled InP, or similar (depends on the firmware version).
  
• Select PT for PT100 input.
  
• Press SET to confirm.
  

Practical Tips

• Always check the sensor precision before enabling additional decimal places.
  
• For fast-reading applications, using fewer decimals can improve visual clarity.
  
• After adjusting, re-verify your setpoint and alarm values for compatibility with the new format.
  

Useful Tips

• After changing the input type, allow the controller to stabilize for accurate readings.
  
• If using thermocouples instead, select K, J, or other supported types.
  
• Recheck your alarm and control parameters after changing decimal precision.
  

Conclusion

Adjusting the decimal point on your TCN5 controller helps tailor the device to your specific process needs. Whether you're working in high-precision environments or prefer simplified displays, the TCN5 makes it easy to configure.

Need help with advanced settings? Contact our support team or visit the TCN5 product page.