TQ TQ4000 - Exit Menu; Change Password; Exit Sub Menu; Set Span

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press the UP and DOWN buttons to display the required channel location and
then press the SELECT button to accept that channel location.
2.8.1. Set Zero
The user may press the MENU button to toggle between gas zero and
4-20mA zero calibration.
The user must apply zero gas to the sensor and adjust the value
appropriately on the LCD using the UP and DOWN buttons. Once the
desired value is displayed the user may press the SELECT button to
accept this zero level.
2.8.2. Set Span
The user may press the MENU button to toggle between gas span and
4-20mA span calibration.
The user must apply span gas to the sensor and adjust the value
appropriately on the LCD using the UP and DOWN buttons. Once the
desired value is displayed the user may press the SELECT button to
accept this span level.
2.8.3. Exit Sub Menu
Pressing the SELECT button will exit from the Calibrate Channel sub
menu and return the user to the main menu.
2.9. Change Password
This option allows the user to change the default password. The user is
prompted to enter the new four digit password, using the UP and DOWN
buttons to change the digits and the SELECT button to accept the digit. Once
the password is entered the user is prompted to re-enter the password to
ensure that the required password was correct.
2.10. Exit Menu
Pressing the SELECT button will exit from the main menu and the TQ4000
system will resume normal system operation.