Hach DR 1900 Basic User Manual page 16

Problem
Initializing Failed!
Calibration Needed!
Air Scan Needed!
Please attach the
module!
Failed in sending data!
16 English
Possible cause
While initializing, the instrument failed.
The calibration data is corrupt.
The calibration data is corrupt.
The module is not found when data is sent.
Solution
Set the instrument to off and then
to on.
Contact technical support.
Contact technical support.
Contact technical support.
Insert a module.
Make sure that the module is
inserted and latched correctly.