Hach Pocket Colorimeter II Instruction Manuals page 86

Error Codes,
3. E-2 LED Error
The LED (light source) is out of regulation.
•
Replace batteries.
•
Verify LED lights up (inside the cell holder) when the
ZERO/SCROLL
•
If the problem persists, contact a Service Center
Note: When an E-1 or E-2 error occurs on a measurement, the display will show "_.__". (The
decimal place is determined by the chemistry.) If the E-1 or E-2 error occurs while
zeroing the meter, the meter will require the user to re-zero.
4. E-3 Standard Adjust Error
The value obtained on the prepared standard exceeds the adjustment limits
allowed for the standard concentration, or the concentration of the standard is
outside the concentration range allowed for standard calibration adjust.
•
Prepare the standard and rerun according to the procedure.
•
Prepare a standard at or near the recommended concentrations given in the
procedure.
•
Verify that the concentration of the standard has been entered correctly.
continued
key is pressed.
2—10
READ/ENTER
(page 2—37).
or