is expressed in a variety of units based on the one which reflects the titration method and strength of NaOH used during titration. Titratable acidity can be expressed in several units. Each of these units corresponds to a specific procedure used to titrate dairy products. % Lactic Acid (% l.a.): is determined by titrating a 20 mL or 20 g sample diluted with twice its volume of deionized or distilled water with 0.1 M sodium hydroxide to a phenolphthalein endpoint. Degree Soxhlet Henkel (°SH): is determined by titrating a 50 mL sample with 0.1 M sodium hydroxide to a phenolphthalein endpoint. Degree Dornic (°D): is determined by titrating a 100 mL sample with N/9 sodium hydroxide to a phenolphthalein endpoint. Degree Thörner: is determined by titrating a 10 mL sample diluted with twice its volume of deionized or distilled water with 0.1 M sodium hydroxide to a phenolphthalein endpoint. From: To: Divide By: %l.a. °SH 0.0225 %l.a. °D 0.0100 %l.a. °Th 0.0090 Eliminate Subjectivity and Increase Efficiency The HI84529 Mini Titrator eliminates the subjective endpoint color change detection determined by the human eye, and instead employs the sensitivity and accuracy of a pH sensor. The titration method is a potentiometric endpoint determination using a pre-determined pH value. The titratable acidity values will vary depending on the method used. Select Low 50 to titrate a non diluted sample, or select low 20/High 20 to titrate 20 mL or 20 g samples that are diluted with twice its volume or deionized or distilled water. The HI84529 uses methods based on AOAC International and Standard Methods for the Examination of Dairy Products. Both of these methods report titratable acidity as % lactic acid, a rough conversion factor can be used to convert the results to the other available units. The HI84529 can be customized to meet the needs of any dairy analysis lab. Samples can be titrated by weight or volume, diluted or non-diluted (low range only) and titrated to a fixed pH endpoint that can be adjusted by the user. Specifications HI84529 Titrator Range Low Range: %l.a.: 0.01 to 0.20; °SH: 0.4 to 8.9; °D: 1.0 to 20.0; °Th: 1.1 to 22.2 High Range: %l.a.: 0.1 to 2.0; °SH: 4.4 to 88.9; °D: 10 to 200; °Th: 11.1 to 222.2 Resolution Low Range: %I.a.: 0.01 ; °SH: 0.1; °D: 0.1; °Th: 0.1 High Range: %I.a.: 0.1; °SH: 0.1; °D: 1; °Th: 0.1 Accuracy (@25°C/77°F) Low Range: ± 0.01 %l.a. High Range: ± 0.1 %l.a. Method acid-base titration Sample Size (LR 20) 20 mL or 20 g Sample Size (LR 50) 50 mL or 50 g Sample Size (HR 20) 20 mL or 20 g Principle endpoint titration, adjustable (pH 8.0 - 8.7 in 0.1 increments) Pump Speed 10 mL/min Stirring Speed 800 (Low Range) / 1000 (High Range) pH Meter Range -2.0 to 16.0 pH / -2.00 to 16.00 pH Resolution 0.1 pH / 0.01 pH Accuracy (@25°C/77°F) ±0.01 pH Calibration one, two or three-point calibration; four available buffers (pH 4.01, 6.00, 8.30, 10.01) Temperature Compensation manual or automatic mV Meter Range -2000.0 to 2000.0 mV Resolution 0.1 mV Accuracy ± 1.0 mV Temperature Range -20.0 to 120.0°C; -4.0 to 248.0°F; 253.2 to 393.2 K Resolution 0.1°C; 0.1°F; 0.1 K Accuracy ±0.4°C; ±0.8°F; ±0.4 K Additional Specifications Logging Data up to 400 samples (200 pH/mV, 200 titration) Electrodes FC260B pH electrode with 1 m (3.3’) cable (included), HI5315 reference probe with 1 m (3.3’) cable (included) Temperature Probe HI7662-T stainless steel temperature probe with 1 m (3.3’) cable (included) Connectivity (1) Type-B USB for PC interface, (1) Type-A USB for storage Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Power Supply 12 VDC power adapter (included) Dimensions 235 x 200 x 150 mm (9.2 x 7.9 x 5.9”) Weight 1.9 kg (67.0 oz.) Ordering Information HI84529-01 (115V) and HI84529-02 (230V) are supplied with HI84529-70 Reagent Kit for titratable acidity in dairy products, FC260B pH electrode, HI5315 reference electrode, HI7662-M temperature probe, HI7072 fill solution (30 mL), HI700640 cleaning solution for milk deposits (2 x 20 mL), capillary dropper pipette, 100 mL beakers (2), dosing pump valve, 5 mL syringe, 1 mL plastic pipette, tube set (aspiration tube with titrant bottle cap and dispensing tube with tip), stir bar, power adapter, instruction manual and quality certificate. See reagents and accessories on page 4.79 4 Titration 4.63 www.hannainst.com |
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