• Turn the meter on by pressing the button. All
segments will be displayed. When the display
shows
“Add”
,
“C1”
with “
Press
” blinking, the
meter is ready.
• Fill the cuvette with 10 mL of unreacted sample
and replace the cap. Place the cuvette into the
meter and close the meter’s cap.
• Press the button. When the display shows
“
Add
”, “
C.2
” with “
Press
” blinking the meter
is zeroed.
• Remove the cuvette from the meter and unscrew
the cap. Add the content of one packet of
HI749-0
reagent. Replace the cap and shake
vigorously for about 10 seconds. Place the
cuvette back into the meter.
• Press and hold the button until the timer is
displayed on the LCD (the display will show
the countdown prior to the measurement) or,
alternatively, wait 6 minutes and press the
button.
• The instrument directly displays the
concentration of chromium VI in ppb. The
meter automatically turns off after 10 minutes.
Light High:
There is too much light to perform a measurement. Please
check the preparation of the zero cuvette.
Light Low:
There is not enough light to perform a measurement. Please
check the preparation of the zero cuvette.
Inverted Cuvettes:
The sample and the zero cuvette are inverted.
Under Range:
A blinking
“0”
indicates that the sample absorbs less
light than the zero reference. Check the procedure and make sure you
use the same cuvette for reference (zero) and measurement.
Over Range:
A flashing value of the maximum concentration indicates
the reading is over range. Dilute the sample and re-run the test.
Battery Low:
The battery must be replaced soon.
Dead Battery:
This indicates that the battery is dead and must be
replaced. Once this indication is displayed, normal operation of the
instrument will be interrupted. Change the battery and restart the meter.
Cover
Cuvette with cap
Cuvette holder
LCD Liquid Crystal Display
Operation Button
Functional Description
Errors and Warnings
Measurement Procedure
Hanna Instruments reserves the right to modify the design, construction or appearance of
its products without advance notice.
Thank You
Thank you for choosing a Hanna Instruments product. Please read this instruction
manual carefully before using the instrument.
For more information about Hanna Instruments and our products, visit
www.hannainst.com.
For technical support, contact your local Hanna Instruments Office or e-mail us at
[email protected].
Find your local Hanna Instruments Office on www.hannainst.com.
Please examine this product carefully. Make sure that the instrument is not damaged. If
any damage occurred during shipment, please contact your local Hanna Instruments Office.
Each
HI749
meter is supplied complete with:
• Sample Cuvettes and Caps (2 pcs.)
• Reagents for 6 tests
• 1.5V AAA Battery (1 pc.)
• Instruction Manual and Quick Reference Guide
Preliminary Examination
Range
0 to 300 ppb
Resolution
1 ppb
Accuracy
±3 ppb ±5% of reading @25 °C/77 °F
Light Source
Light Emitting Diode @525 nm
Light Detector
Silicon Photocell
Method
Adaptation of the ASTM Manual of Water and Environmental Technol-
ogy, D1687-92, Diphenylcarbohydrazide method. The reaction be-
tween chromium VI and the reagent causes a purple tint in the sample.
Environment
0 to 50 °C (32 to 122 °F); max 95% RH non-condesing
Battery Type
1.5V AAA (1 pc.)
Auto-Shut off
After 10 minutes of non-use
Dimensions
86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”)
Weight
52 g (1.84 oz.)
Specifications
