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HI 84431

Total Titratable Low to High Alkalinity Titrator

User-friendly interface
Dedicated HELP key
Simple to operate
Log on demand up to 100 samples (50 for pH; 50 for titration)
GLP features
One, two or three point calibration
pH temperature compensation

The HI 84431 is a dedicated mini titrator and pH meter designed for low to high levels of alkalinity. It utilizes an electrometric titration with a pH electrode to determine the total titratable alkalinity in water. Titrant is slowly added to the sample solution the pH and temperature are carefully monitored. The software analyzes the resulting pH curve and determines the volume of titrant required to reach the endpoint. The user can choose either 8.3 pH (known as phenolphthalein alkalinity) or 4.5 pH (known as bromcresol green alkalinity as endpoints).

The dispensed titrant volume is used to automatically calculate the water alkalinity, which can be displayed in mg/L CaCO3 or meq/L.  Titrations are conducted using the low range reagent HI 84431-50 (10 to 500 mg/L as CaCO3) or the high range reagent HI 84431-51
(400 to 4000 mg/L as CaCO3).

Order Information:
HI 84431-01 (115V) and HI 84431-02 (230V) are supplied with HI 84431-50 titrant solution low range (100 mL), HI 84431-51 titrant high range (100 mL) and HI 84431-55M pump calibration solution (230 mL).

Specifications

Range Total Titratable Alkalinity
(Very Low/Ultra Low Range) mg/L: 10.0 – 500.0 mg/L as CaCO3
meq/L : 0.3 – 10.0 meq/L
Total Titratable Alkalinity (HR) mg/L: 400 – 4000 mg/L as CaCO3
meq/L : 8 – 80 meq/L
pH -2.0 to 16.0 pH / -2.00 to 16.00 pH
Temperature -20.0 to 120.0 °C (-4.0 to 248.0 °F)
Resolution Total Titratable Alkalinity (VL/UL) 0.1 mg/L; 0.1 meq/L
Total Titratable Alkalinity (HR) 1 mg/L; 1 meq/L
pH 0.1 pH / 0.01 pH
Temperature 0.1 °C
Accuracy
(@25ºC) Titratable Alkalinity (VL/UL) 5% of reading
Titratable Alkalinity (HR) 5% of reading
pH ± 0.01 pH
Temperature ±0.4 °C without probe error
Titration Method   acid-base titration (total alkalinity)
Titration Principle   endpoint titration: 4.5 pH / 8.3 pH
Pump Volume   0.5 mL/min
Stirring Speed   600 rpm
pH Temperature   manual or automatic from: -20 to 120 °C (-4 to 248 °F)
Logging Titration up to 50 samples
pH up to 50 samples
pH Calibration   one, two or three point calibration; three available buffers (4.01; 8.30; 10.01)
pH Electrode   HI 1131B glass body pH electrode with BNC connector and 1 m (3.3’) cable
Temperature Probe   HI 7662-M stainless steel temperature probe with 1 m (3.3’) cable(included)
Environment   0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
Power Supply   12 VDC power adapter
Dimensions   208 × 214 × 163 mm (8.2 × 8.4 × 6.4”) (with beaker)
Weight   2200 g (77 oz.)

Dimensions

Accessories

Solutions
HI 84431-50 Titrant Solution for Low Range Alkalinity
HI 84431-51 Titrant Solution for High Range Alkalinity
HI 84431-55M Pump Calibration Solution
Accessories
HI 70483T Replacement Tubing Set
HI 731319 Micro Stir Bars for Magnetic Stirrers
HI 731342 2000 µL Graduated Pipette
HI 731352 Plastic Tip Set for 2000 µL Graduated Pipette
HI 731341 1000 µL Graduated Pipette
HI 731351 Plastic Tip Set for 1000 µL Graduated Pipette
Reagents & Standards
HI 84431-70 Reagents Kit for Low and High Range Alkalinity
HI 84431-71 Reagents Kit for Low Range Alkalinity
HI 84431-72 Reagents Kit for High Range Alkalinity