background image

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.

Reviews: