User-Entered Calibration; Overview - Hach POCKET COLORIMETER II Instruction Manual

Analysis system

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User-Entered Calibration

The Pocket Colorimeter™ II will accept a user-prepared calibration curve. The curve

can extend from 0 to 2.5 absorbance. A user-prepared calibration curve may be

entered into any channel that does not contain a factory-programmed curve. These

channels are labeled "abs" on instruments having a single factory calibration or

are labeled "1" and "2" on the uncalibrated single wavelength instruments. Any

chemistry that can be run at the instrument wavelength may be user-entered in

these channels.

Using prepared standard solutions that cover the range of interest, the meter

generates a calibration curve by calculating the straight-line segments between

each standard entered. A calibration curve may be entered using the keypad.

Factory-entered calibration curves may also be recalculated or adjusted using the

same procedure.

To enter the user-entered calibration mode, press the

key and hold it down

until the display shows "USER" (about 5 seconds), followed by "CAL". Press

to scroll through the options.

ZERO/SCROLL

Note: If the meter does not display USER followed by CAL after pressing the

key, the

factory calibration cannot be modified on this channel.

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