Hanna Instruments Chromium VI User manual

Chromium VI Low Range Preliminary examination:
Please examine this product carefully. Make sure that the instrument is not damaged. If
any damage occurred during shipment, please notify your Dealer.
Each HI 749 meter is supplied complete with:
• Two Sample Cuvettes and Caps
• Six packets of Chromium VI LR Reagent
• 1 x 1.5V AAA Battery
• Instruction Manual
HI 749
Technical specifications:
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
Technology, D1687-92
, Diphenylcarbohydrazide method.
The reaction between 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-condensing
Battery Type 1 x 1.5V AAA
Auto-Shut off After 10 minutes of non-use
Dimensions 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight 64 g (2.25 oz.)
Functional description:
Errors and warnings:
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.
1. Dust cover.
2.Cuvette with cap.
3.Cuvette holder.
4.Liquid Crystal Display.
5.Button.
For more details about spare parts and accessories
see “Accessories”.
Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instrument. If you need
additional technical information, do not hesitate to e-mail us at [email protected] or
view our worldwide contact list at www.hannainst.com.

•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 HI 749-0 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 in ppb. The meter
automatically turns off after 10 minutes.
10 mL
•It is important that the sample does not contain any debris.
•Whenever the cuvette is placed into the measurement cell, it must be dry
outside, and completely free of fingerprints, oil and dirt. Wipe it thoroughly
with HI 731318 or a lint-free cloth prior to insertion.
•Shaking the cuvette can generate bubbles, causing lower readings. To obtain
accurate measurements, remove bubbles by swirling or by gently tapping the
cuvette.
•Do not let the reacted sample stand for too long after reagent is added, as
accuracy will be affected.
•After the reading it is important to immediately discard the sample, otherwise the
glass might become permanently stained.
REAGENT SETS
HI 749-25 Reagent set for 25 Chromium VI Low Range tests
OTHER ACCESSORIES
HI 749-11 Chromium VI LR Certified Standard Kit
HI 731318 Cloth for wiping cuvettes (4 pcs.)
HI 731321 Glass cuvettes (4 pcs.)
HI 731225 Cuvette black cap for checker HC (4 pcs.)
HI 731353 Cuvette seal cap for checker HC (4 pcs.)
HI 740028 1.5V AAA batteries (4 pcs.)
HI 93703-50 Cuvette cleaning solution (230 mL)
Recommendations for Users
Before using this product, make sure that it is entirely suitable for your specific application and for
the environment in which it is used.
Operation of this instrument may cause unacceptable interferences to other electronic equipment,
thus requiring the operator to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may degrade the instrument’s EMC
performance.
To avoid damage or burns, do not put the instrument in microwave oven. For the safety of you
and the instrument do not use or store the instrument in hazardous environments.
Hanna Instruments reserves the right to modify the design, construction or
appearance of its products without advance notice.
Battery management
IST749 04/13
Measurement procedure: Accessories:Tips for an accurate measurement
To save the battery, the instrument shuts down after 10 minutes of non-use.
One fresh battery lasts for a minimum of 5000 measurements. When the battery is dead
the instrument will display “bAd” then ”bAt” for 1 second and then turns off.
To restart the instrument, the battery must be replaced with a new one.
To replace the instrument’s battery:
•Turn the instrument off by holding the button until the meter shuts off.
•Turn the instrument upside down and remove the battery cover with a screwdriver.
•Remove the battery from its location and replace it with a new one, inserting the
negative end first.
•Insert the battery cover and replace the screw with a screwdriver.