Using The Spec √ Standards - Hach POCKET COLORIMETER II Instruction Manual

Specê Secondary Standards for DPD Chlorine,
Note:
Before proceeding, make sure the instrument is in the low
See Switching Ranges on page 2—4.
Using the Spec
1. Place the colorless Spec
mark facing the keypad. Tightly cover the cell with the instrument cap.
2. Press . The display will show "0.00".
ZERO
3. Place the STD 1 cell into the cell holder. Tightly cover the cell with the
instrument cap.
4. Press
READ/ENTER
5. Repeat steps 3 and 4 with cells labeled STD 2 and STD 3.
6. Compare these measurements with previous measurements to verify the
instrument is performing consistently. (If these are the first measurements,
record them for comparison with later measurements.)
Note:
If the instrument is user-calibrated, initial standard measurements of the Spec
Standards will need to be performed again for the user calibration.
√
Standards
√
blank into the cell holder with the alignment
. Record the concentration measurement.
1—52
continued
range channel.
(LR)
√