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20

METHOD PROCEDURE

8.  METHOD PROCEDURE

REQUIRED REAGENTS
Code Description 

Quantity

HI93749-0 

Chromium(VI) LR Reagent 

1 packet

REAGENT SETS

HI93749-01

 

Chromium(VI) LR Reagent - 100 tests

HI93749-03

 

Chromium(VI) LR Reagent - 300 tests

For other accessories see ACCESSORIES section.

MEASUREMENT PROCEDURE

Note: 

If tutorial mode is disabled follow the measurement procedure below. If the 

tutorial mode is enabled, press 

Measure

 and follow the messages on the screen.

• Fill the cuvette with 10 mL of unreacted sample 

(up to the mark). Replace the plastic stopper and 
the cap.

• Insert the cuvette into the holder and ensure that 

the notch on the cap is positioned securely in the 
groove.

• Press 

Zero

. The display will show “-0.0-” when the meter is zeroed and ready for 

measurement.

 

 

• Remove the cuvette.

• Add one packet of 

HI93749-0

 Chromium(VI) LR 

Reagent. Replace the plastic stopper and the cap. 
Shake vigorously for about 10 seconds.

10 mL

Summary of Contents for HI97749

Page 1: ...INSTRUCTION MANUAL HI97749 Chromium VI Low Range Photometer ...

Page 2: ...g a Hanna Instruments product Pleasereadthisinstructionmanualcarefullybeforeusingthisinstrument This manual will provide you with the necessary information for correct use of this instrument as well as a precise idea of its versatility If you need additional technical information do not hesitate to e mail us at tech hannainst com or view our worldwide contact list at www hannainst com Dear Custome...

Page 3: ... 6 1 METER VALIDATION CAL CHECK CALIBRATION 11 6 2 CHEMICAL FORMULA UNIT CONVERSION 12 6 3 GLP 13 6 4 LOGGING DATA LOG RECALL 13 6 5 GENERAL SETUP 14 6 6 REAGENTS ACCESSORIES 16 6 7 CONTEXTUAL HELP 17 6 8 BATTERY MANAGEMENT 17 7 PHOTOMETER 18 7 1 PROPER USE OF POWDER PACKET 18 7 2 CUVETTE PREPARATION 18 8 METHOD PROCEDURE 20 9 WARNING ERROR DESCRIPTIONS 22 10 BATTERY REPLACEMENT 24 11 ACCESSORIES ...

Page 4: ...e A HI97749B CAL Check Cuvette B for Chromium VI Low Range Cloth for wiping cuvettes Scissors 1 5V AA Alkaline batteries CAL Check standard certificate Instrument quality certificate Instruction manual Each HI97749 is delivered in a cardboard box and is supplied with Sample cuvette 2 pcs Sample cuvette cap 2 pcs Plastic stopper 2 pcs 1 5V AA Alkaline batteries Instrument quality certificate Instru...

Page 5: ...nd rinse with plenty of water If reagent contacts skin rinse the affected area thoroughly with water Avoid breathing released vapors Waste disposal For proper disposal of reagent kits and reacted samples contact a licensed waste disposal provider 3 ABBREVIATIONS µ L micrograms per liter ppb mL milliliter C degree Celsius F degree Fahrenheit EPA US Environmental Protection Agency GLP Good Laborator...

Page 6: ...r wavelength accuracy 1 0 nm Light detector Silicon photocell Cuvette type Round 24 6 mm diameter 22 mm inside Additional Specifications Auto logging 50 readings Display 128 x 64 pixel B W LCD with backlight Auto off After 15 minutes of inactivity 30 minutes before a READ measurement Battery type 1 5 V AA Alkaline 3 pcs Battery life 800 measurements without backlight Environment 0 to 50 C 32 to 12...

Page 7: ...performance of the instrument at any time and apply a user calibration if necessary Hanna Instruments CAL Check cuvettes are made with NIST traceable standards The built in tutorial mode guides users step by step through the measurement process It includes all steps required for sample preparation the required reagents and quantities The HI97749 meter measures the chromium content in water samples...

Page 8: ...over Keypad Description The keypad contains 3 direct keys and 3 functional keys with the following functions Press the functional key to perform the function displayed above it on the LCD Press and hold to power off on Press briefly to return to the previous screen Press to access the menu screen Press to display the context sensitive help menu ...

Page 9: ...sorbed by atoms molecules or crystal lattices Photometric chemical analysis is based on specific chemical reactions between a sample and reagent to produce a light absorbing compound If pure absorption occurs the fraction of light absorbed depends both on the optical path length through the matter and on the physical chemical characteristics of the substance according to the Lambert Beer Law If al...

Page 10: ... luminous efficiency providing more light while using less power They also produce little heat which could otherwise affect electronic stability LEDs are available in a wide array of wavelengths whereas tungsten lamps have poor blue violet light output Improved optical filters ensure greater wavelength accuracy and allow a brighter stronger signal to be received The end result is higher measuremen...

Page 11: ...om direct sunlight by keeping them in the original packing Store between 5 and 30 C 41 to 86 F do not freeze To perform a CAL Check 1 Press CAL Check from measurement mode The Not Available message or the date time and status of the last CAL Check will be displayed on the screen 2 Press Check to start a new CAL Check Press the key at any time to abort the validation process 3 Use the functional ke...

Page 12: ...screen OUT OF SPECIFICATION A user calibration is not allowed the measured value is outside of the tolerance window Check the certified value expiration date and clean the outside of the cuvette Repeat the CAL Check procedure If this error continues contact your nearest Hanna Instruments Customer Service Center 6 2 CHEMICAL FORMULA UNIT CONVERSION Chemical formula and unit conversion factors are p...

Page 13: ...ll measurements Every time a measurement is made the data is automatically saved The data log can hold 50 individual measurements When the data log is full 50 data points the meter will rewrite the oldest data point Viewing and deleting the data is possible using the Log Recall menu Press the key to enter the menu Use the functional keys to select Log Recall and press Select Use the functional key...

Page 14: ...rease or decrease the value Press Accept to confirm or the key to return to the Setup menu without saving the new value Contrast Option 0 to 100 Press Modify to change the display s contrast Use the functional keys to increase or decrease the value Press Accept to confirm the value or the key to return to the Setup menu without saving the new value Date Time Press Modify to change the date and tim...

Page 15: ...format Press Accept to confirm or the key to return to the Setup menu without saving the new format Decimal Separator Option Comma or Period Press the functional key to select the desired decimal separator The decimal separator is used on the measurement screen Language Press Modify to change the language Use the functional keys to select the desired language Press Accept to choose one of the lang...

Page 16: ...ded step by step through the measurement procedure Meter Information Press Select to view the model serial number firmware version and selected language Press the key to return to the Setup menu Restore Factory Settings Press Select to reset to factory settings Press Accept to confirm or Cancel to exit without restoring the factory settings 6 6 REAGENTS ACCESSORIES Pressthe keytoenterthemenu Useth...

Page 17: ... to the previous screen 6 8 BATTERY MANAGEMENT The meter will perform an auto diagnostic test when it is powered on During this test the Hanna Instruments logo will appear on the LCD If the auto diagnostic test was successful the meter is ready for use The battery icon on the LCD will indicate the battery status battery full battery below 10 replace the batteries soon battery is low replace the ba...

Page 18: ...TE PREPARATION Proper mixing is very important for reproducibility of the measurements The proper mixing technique is listed in the method procedure The mixing method is indicated with shake vigorously using one of the following icons In order to avoid reagent leaking and to obtain more accurate measurements close the cuvette first with the supplied HDPE plastic stopper and then the black cap ...

Page 19: ...e reacted sample stand too long after reagent has been added For best accuracy respect the timings described in the method It is possible to take multiple readings in a row but it is recommended to take a new zero reading for each sample and to use the same cuvette for zeroing and measurement when possible Discard the sample immediately after the reading has been taken or the glass might become pe...

Page 20: ...procedure below If the tutorial mode is enabled press Measure and follow the messages on the screen Fill the cuvette with 10 mL of unreacted sample up to the mark Replace the plastic stopper and the cap Insert the cuvette into the holder and ensure that the notch on the cap is positioned securely in the groove Press Zero The display will show 0 0 when the meter is zeroed and ready for measurement ...

Page 21: ...form the reading The instrument displays concentration in µg L of chromium Cr6 Press the key and use the functional keys to select Chemical Form Use the functional keys and press Select to change the displayed chemical formula to µg L of chromate CrO4 2 and dichromate Cr2O7 2 INTERFERENCES Interference may be caused by Vanadiumabove1mg L waitfor10minutesbeforereadingtoremovetheinterference Iron ab...

Page 22: ...d the zero cuvettes are inverted Swap the cuvettes and repeat the measurement There is either too much light or the instrument can not adjust the light level Please check the preparation of the zero cuvette and that the sample does not contain any debris The meter is either overheating or its temperature has dropped too low to operate within published accuracy specifications The meter must be betw...

Page 23: ...he meter If the issue persists please contact Hanna Instruments technical support Battery level is too low for the meter to function properly Replace the batteries with new ones Tutorial mode has been enabled in the Setup menu Press Continue and follow the prompt on the screen Tutorial mode can be disabled in the Setup menu A critical error has occurred Restart the meter If the issue persists plea...

Page 24: ...ent s batteries follow these steps Turn the instrument off by pressing and holding the key Remove the battery cover by turning it counterclockwise Remove the old batteries replace them with three new 1 5V AA batteries Replace the battery cover turn it clockwise to close ...

Page 25: ...Reagent 300 tests 11 2 OTHER ACCESSORIES Code Description HI7101412 blue carrying case for HI977xx and 2 CAL Check cuvettes HI731318 cloth for wiping cuvettes 4 pcs HI731331 glass cuvette 4 pcs HI731336N cap for glass cuvette 4 pcs HI93703 50 cuvette cleaning solution 230 mL HI97749 11 CAL Check standards for Chromium VI LR cuvette kit ...

Page 26: ...t in which it is used Any variation introduced by the user to the supplied equipment may degrade the meter s performance For yours and the meter s safety do not use or store the meter in hazardous environments WARRANTY The HI97749 is warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to instructions This warranty is limi...

Page 27: ...Hanna Instruments reserves the right to modify the design construction or appearance of its products without advance notice ...

Page 28: ...World Headquarters Hanna Instruments Inc Highland Industrial Park 584 Park East Drive Woonsocket RI 02895 USA www hannainst com MAN97749 Printed in ROMANIA ...

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