Hanna Instruments HI 84181 User manual

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Instruction Manual
HI 84181
ISE Potassium
Meter
www.hannainst.com

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All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the
copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.
Dear Customer,
Thank you for choosing a Hanna product. This manual will provide you with the necessary
information for the correct use of the instrument. Please read it carefully before using the meter. If
you need additional technical information, do not hesitate to e-mail us at [email protected].
This instrument is in compliance with directives.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION................................................................................................. 3
GENERAL DESCRIPTION ........................................................................................................ 3
SPECIFICATIONS................................................................................................................... 5
PRINCIPLE OF OPERATION .................................................................................................... 5
FUNCTIONAL DESCRIPTION ................................................................................................... 6
START UP ............................................................................................................................ 7
GUIDE TO DISPLAY CODES ..................................................................................................... 8
TIPS FOR AN ACCURATE MEASUREMENT ............................................................................. 14
MEASUREMENT PROCEDURE .............................................................................................. 14
FUSE REPLACEMENT .......................................................................................................... 16
ELECTRODE CONDITIONING AND MAINTENANCE .................................................................. 16
ACCESSORIES .....................................................................................................................19
WARRANTY........................................................................................................................19
MODEL IDENTIFICATION
Two models are available:
HI 84181-01 - 115 Vac power supply
HI 84181-02 - 230 Vac power supply
WARRA (NTY

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PRELIMINARY EXAMINATION
Please examine this product carefully. Make sure that the instrument is not damaged. If any
damage occured during shipment, please notify your Dealer.
Each HI 84181 instrument is supplied complete with:
• Reagents set for 20 tests
• One 2000 µL automatic pipette
• Six plastic tips for the 2000 µL automatic pipette
• Two 50 mL beakers
• HI 61014 Potassium half cell
• HI 5315 Reference half cell
• HI 7662-T Temperature probe
• Stir bar (2 pcs)
• Power cable
• HI 7076 Refilling solution (4×30 mL)
• One 1 mL syringe
• One 1 mL pipette
• Instruction sheet
• Instruction manual
Note:Save all packing material until you are sure that the instrument works correctly.
Any defective item must be returned in its original packing.
GENERAL DESCRIPTION
The HI 84181 is a low cost, easy to use, potassium ISE instrument that performs automatic analysis
with all the necessary calculations assuring to the user a simple and effective interface.
The instrument comes with a powerful and effective built-in algorithm to analyze the shape of the ISE
electrode response and to determine the reaction completion.
By simply pressing the Start key, the instrument performs automatic analysis, all the necessary
calculations and verifications. The result is immediately displayed in convenient units, then the
instrument is ready for another measurement.

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SIGNIFICANCE OF USE
Potassium ion (K+) is absorbed in vine from earth. Unlike other essential nutrients potassium
remains in ionic form and passes to the grapes.
Potassium ion is by far the most important ion that can be found in wine with concentrations
between 0.7-2 g/L (ppt) and is mostly deriving from grapes.
Potassium ion is greatly influencing the taste of wine, the absence of potassium ion giving a sour
taste of wine.
The alcohol content and low temperature make potassium to precipitate as potassium bitartrate.
Red wines have an increased content of potassium compared to white wines because the phenols
inhibit the precipitation of potassium bitartrate in the red wine.
The HI 84181 ISE Potassium meter measures the potassium content in wine using an ion selective
electrode. The used method is double standard addition, a simple and rapid method of analysis, and
the result is readily displayed in g/L K+(ppt).
Above 2.5 g/L the instrument provides information about the approximate potassium content.

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PRINCIPLE OF OPERATION
The determination of potassium concentration is made according to double standard addition method.
This technique enables an unknown concentration and the electrode’s slope factor to be determined
simultaneously.
The Automatic Temperature compensation is available using HI 7662-T temperature probe. By
setting the electrode isopotential point and enabling temperature compensation option in Setup
menu, the obtained concentration is temperature compensated.
The accuracy of the obtained result depends on the stability of the mV reading in every step of the
measurement.
Three selectable stability criteria can be selected in Setup menu. Select Medium or Accurate
criteria in order to have accurate analysis.
Range 0.0 to 5.0 g/L (ppt) K+
Resolution 0.1 g/L (ppt) K+
Accuracy ±5% of reading (see note)
Sample volume 50 mL
Temperature Compensation Automatic from 0 to 80 °C
Electrodes HI 61014 Potassium half cell
HI 5315 Reference half cell
Temperature Probe HI 7662-T (included)
LOG feature 50 samples
Stirring speed 500 rpm
Environment 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
Power supply 220V/50Hz; 10VA
Dimensions 208 x 214 x 163 mm (8.2 x 8.4 x 6.4") (with beaker)
Weight 2200 g (77.6 oz.)
Note: Above 2.5 g/L the instrument provides information about the approximate potassium content.
REQUIRED REAGENTS
Code Description Quantity/Test
HI 84181-0 ISA 2 mL
HI 84181-1 Standard 1 2 mL
HI 84181-2 Standard 2 2 mL
SPECIFICATIONS

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REAR PANEL
5) Potassium half cell 10) Temperature probe socket
6) Reference half cell 11) BNC electrode connector
7) Temperature probe 12) Power switch
8) Electrode holder 13) Fuse
9) Reference socket 14) Power cable connector
FUNCTIONAL DESCRIPTION
FRONT PANEL
INSTRUMENT DESCRIPTION
1) Graphic LCD
2) Functional keys
3) Keypad
4) Electrode holder

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KEYPAD DESCRIPTION
1) ESC - to leave the current screen and to return either to the previous screen or to the
main screen. In the setup parameter modifying mode by pressing ESC the value is
not modified.
2) - to modify a parameter value, to scroll the information from the instrument’s setup
3) HELP - to access/leave the instrument’s contextual help
4) - to modify a parameter value, to scroll the information from the instrument’s setup
5) Functional Keys
START UP
• Place the instrument on a flat table. Do not place the instrument in direct sunlight.
• Connect the instrument to mains socket with ground connection and the correct voltage and
frequency. See the label on the instrument rear for this.
• Connect the HI 61014 potassium half cell, the HI 5315 reference half cell and the HI 7662-T
temperature probe.
• Turn the instrument ON using the power switch from the rear panel of the instrument and
wait until main screen is displayed.

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When the input reading is unstable.
When the stirrer is on.
Temperature warning (only if the “Temperature compensation” is disabled). The
warning symbol will be displayed if the temperature difference between the temperature of
the sample confirmed at the first step and the subsequent readings is greater than 3 °C.
Measure screen
Press ESC at any moment during the measurement cycle and
the instrument will return to the main screen.
Press Pause to pause the measurement process.
Press Stir to start/stop the stirrer.
If the difference between the temperature of the sample
confirmed at the first step and the subsequent readings is
greater than 3°C and the temperature compensation feature is
disabled in Setup, the temperature warning icon will blink
and the message “WARNING: Large temperature change!”
will be displayed.
Main screen display
Press Setup to acces the instrument’s setup.
Press RCL to view logged data.
Press Start to begin a new measurement cycle.
Press HELP at any moment to view the contextual help.
Measure screens
Icons from the stirrer and reading status area
GUIDE TO DISPLAY CODES
During the instrument’s operation a series of informations are displayed on the LCD.
1) current time information area
2) instrument status area
3) functional keys area
4) stability criteria
5) stirrer and reading status area
Conditioning screen
A two minutes conditioning period is initiated.
Press Continue to stop the conditioning period and skip the
message.

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Result screen
The ion concentration is displayed in g/L (ppt) K+. If the
concentration is out of range, the instrument displays the upper
range limit blinking.
Press LOG to save the measured concentration. A message
indicating the free log space will be displayed for a few seconds.
If the free log space is under 10% this message will be
permanently displayed.
Press Start to begin a new measurement cycle.
Wrong slope screen
This screen appears if the computed slope isn’t in the
acceptable range. The acceptable range is 30% to 140%
default slope (53mV/decade).
Press Start to begin a new measurement cycle.
Add standard screen
Add the corresponding standard. Press READ to start the next
step analysis if “Reading confirm” option is enabled in the
Setup menu. If “Reading confirm” option is disabled, the
instrument will start the next step analysis.
Wrong standard error screen
This screen is displayed if step 2 and 3 of the current reading is
out of ±2000mV range or if the difference between the stable
readings from the current and the previous step is too small
(±3mV) or, if in auto confirm mode, the standard addition is
not detected.
Wrong input error screen
This screen is displayed if the current reading is out of
±2000mV range.
Pause screen
Press Resume to continue the measurement process.
Press Stir to start/stop the stirrer.
Sample reading confirm screen (only if this feature is enabled
in setup)
Press CFM to memorize the reading.

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Setup screens
Stability criteria
Options: Accurate, Medium, Fast.
Press the corresponding functional key to select the desired option.
Select Accurate for accurate measurements; long duration.
Select Medium for normal measurements.
Select Fast only for quick estimations; low accuracy in short time.
While in the Setup menu it is possible to modify the instrument’s parameters. By pressing the
/keys it is possible to move between the Setup options. Each menu item displays the
current option. Press HELP to view the contextual help.
Temperature compensation
Options: Enable, Disable
Enable this feature only if HI 7662-T temperature probe is
connected and electrode isopotential point is known.
If enabled, the meter will take into account the temperature of
the readings when evaluating the final result.
If disabled, the computed concentration will not be temperature
compensated.
Press the functional key to select the desired option.
Isopotential point
Options: 1.0 to 50.0 mg/L (ppm).
Press Modify to access the isopotential point concentration
modify screen.
Press /to increase/decrease the isopotential point concentration.
Press Accept to confirm the value or ESC to return to the
Setup menu without saving.
If the temperature compensation feature is disabled the
meter will display “None” for the isopotential point, and the
isopotential point modify screen cannot be accessed.
Concentration unit
Options: g/L, ppt
Press the corresponding functional key to select the desired
concentration unit to be used in displaying measurements results.