Hach POCKET COLORIMETER II, Instruction Manuals

Page: 93 / 116

2—17
User-Entered Calibration,
continued
•
Once in the CAL or Edit option, press the
READ/ENTER
key to navigate through
each option.
Note: Press
ZERO/SCROLL
to quickly scroll through each option.
Calibration Procedure Using Prepared Standards
Note:
Deionized water or a reagent blank can be used to zero during the calibration procedure.
Calibrations generated with deionized water as the zero will give less accurate results if
the reagent blank is significantly more turbid or colored than deionized water. Use the
deionized water or the reagent blank as the zero concentration point (S0) in the following
calibration procedure.
1. Turn on the instrument and select the range to be calibrated. An arrow at the
top of the display will point to the selected range. To change ranges, press the
MENU
key, then use the
READ/ENTER
key to toggle between ranges 1 and 2.
Press
MENU
again to return to measurement mode.
2. Follow the procedure for the chemical method to be calibrated. Prepare a
reagent blank (if needed) and a standard solution. Allow the color to
develop fully.