User Interface; Key Functions; Zero Key; Span Key - Honeywell IAQPoint2 User Manual

User Interface

Key Functions

User Interface
Key Functions
The circuit board offer two buttons, or switches, each performing a
specific function:

Zero Key

The zero key provides the unit with the zero reference. This function must
be performed without any calibration gas connected. To unlock the
function, put switch D7 (lock) in the OFF position (see wiring details).
This activates the calibration. By pressing the Zero key, the calibration will
be activated and the LED will blink slowly for 15 to 30 seconds. The LED
will stop blinking when the calibration is complete.

Span Key

This function calibrates the sensor span. The calibration gas must be
connected to the unit. To unlock the function, put switch D7 (lock) in the
OFF position (see wiring details). By pressing the span key, the calibration
will be activated and the LED will blink quickly for 1 to 2 minutes. The LED
will stop blinking when the calibration is complete.
16 901T User Manual