Why this instrument is so important... Beer haze may be dened as an insoluble or semi-soluble particulate matter which is small enough to form a colloidal suspension in beer. These particles scatter transmitted light and are observed as a degradation in the transparency of the beer. The beer clarity is a parameter constantly controlled in a brewery, and to assure a consistent product quality, the brewmaster needs more than visual inspection. Several substances can cause haze in beer, but the most frequently encountered problem is due to a cross-linking of polyphenol and protein. A range of stabilization treatments are available for avoiding haze problems. The products have to be controlled on several steps during the brewing process, in particular after ltration and before the beer enters the single tanks. Beer Haze Table Grade EBC ASBC Brilliant 0.0 to 0.5 0.0 to 34.5 Almost Brilliant 0.5 to 1.0 34.5 to 69 Very Slightly Hazy 1.0 to 2.0 69 to 138 Slightly Hazy 2.0 to 4.0 138 to 276 Hazy 4.0 to 8.0 276 to 552 Very Hazy > 8.0 > 552 NTU/FNU/FTU EBC ASBC HELM 1 NTU/1 FNU/1 FTU 1 0.25 17.25 10 1 EBC 4 1 69 40 1 ASBC 0.058 0.014 1 0.579 1 HELM 0.1 0.025 1.725 1 Specifications HI847492 Range 0.00 to 9.99; 10.0 to 99.9; 100 to 1000 FTU; 0.00 to 9.99; 10.0 to 99.9; 100 to 250 EBC; 0.00 to 9.99; 10.0 to 99.9; 100 to 17250 ASBC; 0.00 to 9.99; 10.0 to 99.9; 100 to 10000 HELM Range Selection automatic Resolution 0.01, 0.1, 1 FTU,EBC,ASBC, HELM Accuracy ±2% of reading plus 0.05 FTU (0.01 EBC, 0.86 ASBC, 0.5 HELM) Repeatability ±1% of reading or 0.02 FTU, 0.01 EBC, 0.035 ASBC, 0.2 HELM; whichever is greater Stray Light <0.1 FTU, 0.03 EBC, 1.73 ASBC, 1 HELM Light Source LED @ 580 nm Light Detector silicon photocell Method ratio nephelometric method. Display 60 x 90 mm backlit LCD Calibration two, three or four-point calibration Log Memory 200 records Serial Interface USB Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing Power Supply 1.5V AA alkaline batteries (4) or AC adapter Auto-off after 15 minutes of non-use Dimensions 224 x 87 x 77 mm (8.8 x 3.4 x 3.0”) Weight 512 g (18 oz.) Ordering Information HI847492-01 (115V) and HI847492-02 (230V) is supplied with iButton® tags with tag holders (5), sample cuvettes and caps (6), calibration cuvettes (4), silicone oil (HI98703-58), 25 mL glass vials with caps (4), cuvette cleaning cloth, batteries, AC adapter, HI98501 thermometer, instrument quality certificate, instructions and rugged carrying case. Accessories HI847492-11 Calibration standard cuvette Methods Many methods were used to measure turbidity over the years. The Jackson Candle Turbidimeter was used to measure turbidity as Jackson turbidity units (JTU). The method is visual and is not considered very accurate. To obtain more accurate readings, a nephelometer should be used as a turbidity reading instrument. HI847492 can report the measurements in FTU (Formazin Turbidity Units), EBC (European Brewing Convention), ASBC (American Society of Brewing Chemists) and HELM. FTU units are equal to NTU units (Nephelometric Turbidity Units). A conversion table between these measurement units is shown below. See page 12.26 for standards and accessories 12 Turbidity 12.23 www.hannainst.com | beer applications
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