K09 DN Temperature Offset

Definition

Fixed value added to the downstream PT100 temperature sensor reading. Functions identically to K07, on the other sensor. Default: 0 (no offset)

$\text{Upstream temperature} = \text{Raw value} \times K_{06} + K_{07}$

$\text{Downstream temperature} = \text{Raw value} \times K_{08} + K_{09}$

Notes

N/A

Operation Procedure

Button Functions (Click to Expand)

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

Blue Button (leftmost): Return, exit, or save settings.
Gray Direction Buttons:
- Left Gray: Previous Page, decrease value, or select item
- Right Gray: Next Page, increase value, or select item
Orange Button (rightmost): Rightmost button: Enter settings, edit, or confirm selection

Do not hold buttons for extended periods to avoid damage.

Button functions may change depending on the operation context to improve usability or prevent accidental presses.

Temperature Calibration Function (Click to Expand)

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):

$\text{Gain} = \frac{T_{2, \text{ref}} - T_{1, \text{ref}}}{T_{2, \text{raw}} - T_{1, \text{raw}}}$

$\text{Offset} = T_{1, \text{ref}} - (\text{Gain} \times T_{1, \text{raw}})$

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.

K06 UP Temperature Scale Setting

K06 UP Temperature Scale Setting Steps
• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
• 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).

K07 UP Temperature Offset

K07 UP Temperature Offset Setting Steps
• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
• 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).

K08 DN Temperature Scale

K08 DN Temperature Scale Setting Steps
• From the main screen (green backlight), press Orange Button (Setup) to enter settings (orange backlight).
• 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).