Hanna Instruments HI 749 Instruction Manual

Chromium VI Low Range
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Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instrument. If you need
HI 749
additional technical information, do not hesitate to e-mail us at tech@hannainst.com or
view our worldwide contact list at www.hannainst.com.
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
Range
Resolution
Accuracy
Light Source
Light Detector
Method
Environment
Battery Type
Auto-Shut off
Dimensions
Weight
w w w . h a n n a i n s t . c o m
For more details about spare parts and accessories
see "Accessories".

Technical specifications:

0 to 300 ppb
1 ppb
±3 ppb ±5% of reading @ 25 °C / 77 °F
Light Emitting Diode @ 525 nm
Silicon Photocell
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.
0 to 50 °C (32 to 122 °F);
max 95% RH non-condensing
1 x 1.5V AAA
After 10 minutes of non-use
81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
64 g (2.25 oz.)

Functional description:

1. Dust cover.
2. Cuvette with cap.
3. Cuvette holder.
4. Liquid Crystal Display.
5. Button.

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.
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