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Force and mechanical measuring equipment
The HI84529 is a fast, convenient and easy way to determine the acid content of food. Based on the acid-base reaction, combined with a powerful algorithm and a dedicated pH electrode, the mini titrator can accurately determine the end point of the reaction. In addition, the HI84529 is also integrated with a piston pump in dynamic pumping mode, automatically adjusting the amount of reagent injected based on the change in the potential of the sample during the titration, helping to save reaction time while still ensuring reliable results. The HI84529 is supplied with all the necessary materials to determine the acid content of both low and high ranges. The chemicals supplied have been mixed in the correct ratio and packaged in a closed process including standards, reagents and pump calibration solutions, eliminating the need for additional glass pipettes and analytical balances.
Piston pump with dynamic pump mode.
The HI5315 reference electrode incorporates anti-contamination features.
Standard solutions and reagents.
The two basic measurements in food are acid titration and pH measurement. pH is a measurement of hydrogen ion concentration while acid titration is an acid-base reaction to determine the acidity of food using NaOH solution.
Acid concentration increases sharply when bacteria are present, so testing for acidity is an indicator of the quality and freshness of food. Acidity is determined by titration with NaOH, the endpoint is pH based, calculated as the total amount of NaOH required to change the pH value from 6.6 (pH of fresh milk) to the pH value preset in the meter. Although pH 7.0 is the theoretical value of the neutralization reaction, phenolphthalein indicator is often used to determine the end point of the reaction. When phenolphthalein is used as an indicator, the solution turns pink at pH 8.3. Acidity can be expressed in different units depending on the titration method, since each method has different sample sizes and NaOH concentrations.
% lactic acid(%l.a): is determined by taking 20mL or 20g of sample and diluting 2 times the sample volume with distilled or deionized water. The sample is then titrated with 0.1M NaOH, with phenolphthalein as indicator.
Degree Soxhlet Henkel (0SH): determined by titrating 50 mL of sample with 0.1 M NaOH, using phenolphthalein as indicator.
Degree Dornic (0D): determined by titrating 100mL of sample with 1/9N NaOH, with phenolphthalein as indicator.
Degree Thörner: determined by taking 10mL of diluted sample to 2 times the volume with distilled or deionized water, then titrating with 0.1M NaOH, with phenolphthalein as indicator.
Based on the relationship between sample mass, volume and concentration of NaOH, we can easily convert between different units according to the table below. The coefficients below have been installed in the machine to help users easily convert to the desired unit.
The HI84529 has a set of titration methods based on the AOAC Standard Methods for Food, which all display results in % lactic acid and conversion factors for converting to other units. The HI84529 can be set up to meet any food analysis laboratory's needs, samples can be titrated by volume or mass, diluted or undiluted (low range) and the endpoint can be adjusted. The HI84529 has three preset titration methods, low range 50 for titrating 50 mL or 50 g of undiluted sample, low range 20 and high range 20 for titrating 20 mL or 20 g of sample diluted to twice its volume.
Specialized pH electrode. The HI84529 is supplied with the FC260B pH half cell electrode, which is a spherical, room temperature, glass membrane pH indicator electrode specifically designed for measuring the pH of foods.
Low temperature glass structure
The glass membrane of the pH electrode is made of low temperature resistant glass (-5 to 60 degrees C) with a resistance of approximately 50MΩ, only half that of normal glass. Because the resistance of glass is inversely proportional to temperature, and food is often stored at low temperatures, when the electrode is inserted into the sample, the resistance of the electrode will increase, too high resistance will cause measurement errors, so the FC260B with low resistance glass membrane is an ideal product for measuring in food.
Reference electrode.
Most electrodes today integrate the reference electrode and the indicator electrode in the same electrode, these electrodes usually have a junction made of ceramic, glass or PTFE, which functions to provide current between the sample and the electrode. However, the HI84529 is provided with a special reference electrode, the HI5315, which is constructed with a PTFE junction, a tube-shaped design surrounding the electrode body, which can be easily moved up and down to remove solids accumulated on the electrode surface, ensuring a stable current, accurate measurement results, and high repeatability.
Piston pump. The most important device of HI84529 is the piston pump. Using a motor to control the operation of the piston makes it easier to control the pumping process, and the amount of reagent pumped out is also more accurate. The pumping mode is set to dynamic, so the amount of reagent pumped in will change depending on the change in potential in the sample after each pump, so when titrating, the machine will pump more reagent to shorten the time, when approaching the end point of the reaction, the amount of reagent will gradually decrease to ensure the accuracy of the measurement process.
pH calibration options
Since the instrument is set to calibrate according to the AOAC food standard method with an endpoint of pH 8.3, the HI84529 is set to optionally set the calibration point based on the pH of raw milk and the reaction endpoint (6.00 and 8.30) to achieve the most accurate results when measuring pH.
Good laboratory practice
The HI84529 integrates a GLP information storage function including electrode and pump calibration date, helping users understand the status of the instrument before use and can be more confident in the measurement results.
Magnetic stirring feature.
The magnetic stirrer is integrated into the machine, automatically maintaining a speed of 800 rpm (low range) or 1000 rpm (high range), making it easy for the device to titrate highly viscous samples.
On-screen features
Easy-to-use interface: HI84529 has a user-friendly design, sharp keypad, large screen for easy use. In addition, the device is installed with a tutorial software, when activated, will guide the user on how to use the device step by step. During use, if there are any questions, the user can press the HELP key for information support.
Warning sign: users will be alerted in case errors occur when using the machine (eg: reagent volume exceeds the allowable limit..)
Graph mode: the mini titrator displays data throughout the titration, including real-time graphs.
Logging on Demand: The HI84529 allows for logging of up to 400 samples: 200 titration results and 200 pH/mV measurements. These data can be stored to a USB drive or transferred to a PC via the USB port.
As a pH/mV meter: in addition to being a titrator, the HI84529 can also be used as a benchtop pH meter, with automatic temperature compensation, automatic buffer recognition, up to 3-point calibration, ±0.01pH accuracy, and GLP data storage.
CAL Check feature. The machine will automatically analyze the electrode response signal during the calibration process and notify the user of problems that may affect the measurement results such as contaminated buffer solution, dirty electrode or cracking… the CAL Check feature not only ensures the accuracy of pH measurements but also helps ensure accuracy in determining the end point of the titration process.
Specifications
|
The scale |
Low ladder: %l.a.: 0.01 – 0.20; °SH: 0.4 – 8.9; °D: 1.0 – 20.0; °Th: 1.1 – 22.2 Height: %l.a.: 0.1 – 2.0; °SH: 4.4 – 88.9; °D: 10 – 200; °Th: 11.1 – 222.2 |
|---|---|
|
Resolution |
Low scale: %I.a.: 0.01 ; °SH: 0.1; °D: 0.1; °Th: 0.1 High scale: %I.a.: 0.1; °SH: 0.1; °D: 1; °Th: 0.1 |
|
Accuracy (@25ºC/77ºF) |
Low range: ± 0.01 %l.a. Height range: ± 0.1 %l.a. |
|
Sample volume |
Low scale 20: 20 mL or 20 g Low scale 50: 50 mL or 50 g 20 mL scale: 20 mL or 20 g |
|
Method |
Acid-base reaction |
|
Rule |
Fixed endpoint, selectable in pH range 8.0 – 8.7 in 0.1 increments |
|
Pump speed |
10 mL/min |
|
Stirring speed |
800 (low scale) / 1000 (high scale) |
|
pH scale |
-2.0 – 16.0 pH; -2.00 – 16.00 pH |
|
pH resolution |
0.1 pH / 0.01 pH |
|
pH accuracy(@25ºC/77ºF) |
±0.01 pH |
|
pH calibration |
Maximum 3 points based on rear buffer system (4.01, 7.01, 8.20, 10.01) |
|
Heat compensation |
Manual or automatic |
|
mV scale |
-2000.0 – 2000.0 mV |
|
mV resolution |
0.1 mV |
|
mV accuracy (@25ºC/77ºF) |
±1.0 mV |
|
Temperature scale |
-20.0 – 120.0°C; -4.0 – 248.0°F; 253.2 – 393.2 K |
|
Temperature resolution |
0.1°C; 0.1°F; 0.1K |
|
Temperature accuracy (@25ºC/77ºF) |
±0.4°C; ±0.8°F; ±0.4 K |
|
Save the template |
Maximum 400 (200 titrations, 200 pH/mV measurements) |
|
Electrode |
FC260B pH electrode with BNC connector, 1m cable and HI5315 reference electrode, 1m cable |
|
Temperature electrode |
HI7662-M, 1 m (3.3') cable |
|
Operating environment |
0 – 50°C (32 – 122°F); Max RH 95% non-condensing |
|
Source |
12 VDC adapter |
|
Size |
235 x 200 x 150 mm (9.2 x 7.9 x 5.9”) |
|
Mass |
1.9 kg (67.0 oz.) |
|
Supply includes |
HI84529-02 (230V) is supplied with FC260B pH electrode, HI5315 reference electrode, HI7662-M temperature electrode, HI7072 electrode fill solution (30 mL), HI84529-50 low range 20 titrant solution (120 mL), HI84529-52 low range 50 titrant solution (120 mL), HI84529-51 high range 20 titrant solution (120 mL), HI84529-55 calibration solution (230 mL), 100 mL plastic beaker (2), pump valve, 5 mL syringe, 1 mL plastic pipette, tubing, magnetic filter, HI700640 milk solids cleaning solution (2x20 mL), 12 VDC adapter, quality certificate and instructions. |
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
Hanna experimental measuring equipment
