Summary #

Select GHL devices use capacitive touch keys that may occasionally require recalibration — for example when keys become unresponsive or trigger unexpectedly due to electrical interference from nearby equipment. This article explains when and how to run a calibration.

Applies to #

• ProfiLux 4 Series (incl. Industrial Line / IL)
• Mitras LX7 Series (incl. Industrial Line / IL)
• Software:
  • GHL Connect (App, Webinterface, myGHL)
  • GHL Control Center

When to calibrate #

Calibration is not required as part of the initial setup — the factory calibration is suitable for normal use. Recalibrate when:

• One or more keys do not respond to touch.
• Keys trigger on their own without being touched. Electrical interference from nearby equipment (pumps, ballasts, power supplies) is a common cause.

Calibration #

Open the calibration settings #

• GHL Control Center: Open the Extras tab in the top menu bar. Under the Hardware section, click Keys.
• GHL Connect: Navigate to Extras → Capacitive Keys.

The settings page shows a table with current key values and calibration data for diagnostic purposes.

Choose calibration type #

Select the calibration type using the radio buttons (GHL Control Center) or the Calibration dropdown (GHL Connect). The selection takes effect immediately and is saved automatically.

• Standard calibration: The device uses the factory default calibration values stored in the firmware. No further action is required after selecting this option.
• Custom calibration: The device uses the values from the last custom calibration run. To record new custom values, click Calibrate Keys and follow the on-screen instructions — press each key firmly for approximately 2 seconds when prompted. The Calibrate Keys button determines the custom values but only has an effect when Custom calibration is selected.

Tips for a successful calibration #

• If keys are behaving erratically due to interference, place the device away from other hardware before calibrating to minimize electrical noise during the process.
• During custom calibration, do not touch the device except when explicitly prompted to press the keys.

Notes #

• “Hands off!” message does not disappear: Restart the device and try again. If the issue occurs repeatedly, contact GHL support.