> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-tx320-english-v1/parameters/k-calibration/k06-up-temperature-unit.md).

# K06 UP Temperature Unit

### Definition

Multiplier applied to the **upstream** PT100 temperature sensor reading. \
Use it when the sensor's error grows in proportion to temperature rather than staying constant.\
Default: **1** (no scaling)

<p align="center"><span class="math">\text{Upstream temperature} = \text{Raw value} \times K_{06} + K_{07} </span></p>

<p align="center"><span class="math">\text{Downstream temperature} = \text{Raw value} \times K_{08} + K_{09} </span></p>

### Notes

N/A

### Operation Procedure

<details>

<summary><strong>Button Functions</strong> <em>(Click to Expand)</em></summary>

When the main screen is displayed in **green backlight**, the four buttons function as follows:

* <img src="https://content.gitbook.com/content/fX3l9RzQpCUpspFteU5B/blobs/ya5mjywEtI16s3njJOBl/image" alt="" data-size="line"> **Blue Button (leftmost):** Return, exit, or save settings.
* Gray Direction Buttons:
  * <img src="https://content.gitbook.com/content/fX3l9RzQpCUpspFteU5B/blobs/0uWDDSFxxM6CfKg9agyl/image" alt="" data-size="line"> **Left Gray:** Previous Page, decrease value, or select item
  * <img src="https://content.gitbook.com/content/fX3l9RzQpCUpspFteU5B/blobs/MPA7mtqj4g7MXG4MSKfd/image" alt="" data-size="line"> **Right Gray:** Next Page, increase value, or select item
* <img src="https://content.gitbook.com/content/fX3l9RzQpCUpspFteU5B/blobs/tN3ntfY5TFvvlg0tCaZg/button-orange.png" alt="" data-size="line"> **Orange Button (rightmost):** Rightmost button: Enter settings, edit, or confirm selection

{% hint style="danger" %}
**Do not hold buttons for extended periods to avoid damage.**
{% endhint %}

{% hint style="info" %}
Button functions may change depending on the operation context to improve usability or prevent accidental presses.
{% endhint %}

</details>

<details>

<summary><strong>Temperature Calibration Function</strong> <em>(Click to Expand)</em></summary>

> Used to correct temperature reading deviations from the optional PT100 temperature sensors.
>
> Related Parameters: **K06** UP Temperature Scale, **K07** UP Temperature Offset, **K08** DN Temperature Scale, **K09** DN Temperature Offset

The gain multiplies the raw reading; the offset is then added. Setting gain to 1 and offset to 0 returns the uncorrected reading.

#### **Choosing which one to adjust**

* Sensor reads high or low by a **constant** amount → adjust the offset only (K07 / K09) and leave gain at 1. This is the typical case for a surface-strapped sensor, where contact resistance shifts the reading by a roughly fixed margin.
* Error **grows with temperature** → adjust the gain (K06 / K08), verified against a reference at two or more points.
* At a single test point a gain error and an offset error are indistinguishable, so a one-point check cannot tell you which to adjust.

#### **Two-point calibration**

With two reference measurements (T₁ reference / T₁ raw and T₂ reference / T₂ raw):

<h3 align="center"><span class="math">\text{Gain} = \frac{T_{2, \text{ref}} - T_{1, \text{ref}}}{T_{2, \text{raw}} - T_{1, \text{raw}}} </span></h3>

<p align="center"><span class="math"> \text{Offset} = T_{1, \text{ref}} - (\text{Gain} \times T_{1, \text{raw}}) </span></p>

Take the two points as far apart as the application allows — close-together points amplify measurement error in the gain.

#### **For thermal energy (BTU) measurement**

Each sensor is corrected independently from its own raw reading, and the result depends on the *difference* between the two. Calibrate both against the same reference at the same time; matching the pair matters more than either absolute value.

{% stepper %}
{% step %}

### K06 UP Temperature Scale Setting

h

<pre><code>K06 UP Temperature Scale Setting Steps
<strong>• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
</strong>• Use Gray Arrow Buttons to select K. Calibration, press Orange Button (Enter).
• Use Gray Arrow Buttons to select K06 UP Temperature Scale, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the digit to adjust (highlighted in dark gray).
• Press Orange Button (Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button (Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button (Save).
• Confirm by pressing Orange Button (Save) — or Blue Button (NOT) to cancel.
• Press Blue Button (ESC) to return to the main screen (green backlight).
</code></pre>

<figure><img src="https://2757023840-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfX3l9RzQpCUpspFteU5B%2Fuploads%2FlcZ6x4gwoieMlyGYu9sy%2FFU-TX320-K06-en.png?alt=media&amp;token=5fa3d575-9208-4c1b-92c7-b3e397b3d6a4" alt="" width="394"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### K07 UP Temperature Offset

<pre><code>K07 UP Temperature Offset Setting Steps
<strong>• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
</strong>• Use Gray Arrow Buttons to select K. Calibration, press Orange Button (Enter).
• Use Gray Arrow Buttons to select K07 UP Temperature Offset, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the digit to adjust (highlighted in dark gray).
• Press Orange Button (Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button (Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button (Save).
• Confirm by pressing Orange Button (Save) — or Blue Button (NOT) to cancel.
• Press Blue Button (ESC) to return to the main screen (green backlight).
</code></pre>

<figure><img src="https://2757023840-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfX3l9RzQpCUpspFteU5B%2Fuploads%2FqAc3TVW6YQuKcDJ9oBFH%2FFU-TX320-K07-en.png?alt=media&amp;token=c67fbf50-3627-4bb5-bd94-42ce4883de9c" alt="" width="394"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### K08 DN Temperature Scale

<pre><code>K08 DN Temperature Scale Setting Steps
<strong>• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
</strong>• Use Gray Arrow Buttons to select K. Calibration, press Orange Button (Enter).
• Use Gray Arrow Buttons to select K08 DN Temperature Scale, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the digit to adjust (highlighted in dark gray).
• Press Orange Button (Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button (Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button (Save).
• Confirm by pressing Orange Button (Save) — or Blue Button (NOT) to cancel.
• Press Blue Button (ESC) to return to the main screen (green backlight).
</code></pre>

<figure><img src="https://2757023840-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfX3l9RzQpCUpspFteU5B%2Fuploads%2FTtAEmjNRJa3i22jDNzAY%2FFU-TX320-K08-en.png?alt=media&amp;token=5a51a357-1476-4070-96c9-9759d82e0802" alt="" width="394"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### K09 DN Temperature Offset Setting

<pre><code>K09 DN Temperature Offset Setting Steps
<strong>• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
</strong>• Use Gray Arrow Buttons to select K. Calibration, press Orange Button (Enter).
• Use Gray Arrow Buttons to select K09 DN Temperature Offset, press Orange Button (Enter).
• Use Gray Arrow Buttons to choose the digit to adjust (highlighted in dark gray).
• Press Orange Button (Edit) to enter adjustment mode.
• Adjust digits: Left Gray Button to increase, Right Gray Button to decrease.
• Press Orange Button (Set) to confirm each digit; repeat for other digits as needed.
• After all digits are set, press Blue Button (Save).
• Confirm by pressing Orange Button (Save) — or Blue Button (NOT) to cancel.
• Press Blue Button (ESC) to return to the main screen (green backlight).
</code></pre>

<figure><img src="https://2757023840-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfX3l9RzQpCUpspFteU5B%2Fuploads%2Fh67nbsamKozZffoBrr9I%2FFU-TX320-K09-en.png?alt=media&amp;token=f45c9eef-1406-475f-96bb-8dcc788bb411" alt="" width="394"><figcaption></figcaption></figure>
{% endstep %}
{% endstepper %}

</details>

### K06 Options, RS485 Values, Read/Write Commands, and Formats

| Parameter Input Range | Corresponding Values | RS-485 Value |
| --------------------- | -------------------- | ------------ |
| Default               | 1                    | -            |
| Minimum               | 0.1                  | -            |
| Maximum               | 10                   | -            |

> Refer to the [Read/Write Memory List](/qr/fu-tx320-english-v1/communication/modbus-rtu-protocol/read-write-memory-ram/read-write-memory-read-listx.md) for the Modbus command format. This parameter uses the float 32 data format.


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