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Configure the data recorder output
Note: The recorder minimum and maximum values are selected independently for
each measurement mode. When the measurement mode changes, the previous
settings are automatically used.
1. Push SETUP. The SETUP light turns on.
2. Use the arrow keys to select an option:
Option Description
14
Sets the minimum value of the recorder output for the current
measurements units.
15
Sets the the maximum value of the recorder output for the current
measurement units.
16
Moves the recorder minimum output to calibrate the recorder.
17
Moves the recorder full-scale output to calibrate the recorder.
18
Sets the recorder to zero scale.
19
Sets the recorder to half scale.
20
Sets the recorder to full scale.
3. Push ENTER.
4. If option 14 or 15 was selected, move the decimal point to the correct
location using the right arrow key, then push ENTER.
5. Use the arrow keys to change the value.
6. Push ENTER.
7. Push SETUP.
Advanced operation
Calibrate the turbidimeter with formazin standards
The instrument may be calibrated using prepared formazin standards
made from 4000-NTU formazin stock solution. Refer to
on page 47.
Note: Use recently prepared formazin standards to get the accuracy specifications
for turbidity in
Specifications
on page 5.
38 English
Prepare formazin standards
For the best accuracy and long-term data comparability, use formazin
stock solution from Hach to make formazin standards.
Note: As an alternative, a 4000-NTU formazin stock solution that is prepared by
the user may be used to make formazin standards. Refer to
formazin stock solution
Prepare formazin standards immediately before calibration in an
environment that is at the same ambient temperature as the instrument.
Discard after use.
Refer to
calibration standards.
Standard
20 NTU
200 NTU
Accessories
on page 41.
Table 6
for the procedures to make the recommended
Table 6 Formazin standard preparation
Step 1
Step 2
Add 100 mL of dilution
With a TenSette
water to a clean 200-
Pipet, add 1.00 mL
mL Class A volumetric
of well-mixed 4000-
flask. Refer to
Prepare
NTU formazin stock
dilution water
solution to the 200-
on page 23.
mL flask.
Add 50 mL of dilution
With a TenSette
water to a clean 100-
Pipet, add 5.00 mL
mL class A volumetric
of well-mixed 4000-
flask.
NTU formazin stock
solution to the 100-
mL flask.
Making 4000-NTU
Step 3
®
Dilute to the mark
with dilution water.
Stopper and mix.
1
Dilute to the mark
with dilution water.
Stopper and mix.
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