Vaisala K-PATENTS® Sanitary Compact Refractometer


pr23ac Sanitary Compact Refractometer


Vaisala K-PATENTS® Sanitary Compact Refractometer 

Vaisala K-PATENTS® Sanitary Compact Refractometer

 provides accurate means for measuring Brix and liquid concentrations in small pipe line sizes of 2.5 inch and smaller.

The PR-23-AC sensor is installed in the pipe bend. It is angle mounted in the outer corner of the pipe bend directly or through a flow cell and 3A Sanitary clamp or Varivent® connection. This way the best flow conditions and selfcleaning effect can be achieved.

The measurement range covers 0-100 Brix. The accuracy is ± 0.1 Brix and the measurement is automatically temperature compensated. Low and high concentration alarms can be configured. Because of the digital sensing technology, even large amounts of suspended solids, crystals, bubbles or color changes do not affect the measurement or the accuracy.

  • Universal calibration of each PR23AC sensor: All sensors are freely interchangeable.
  • Full measurement range Refractive Index (nD) 1.3200 – 1.5300, which
    corresponds to 0-100 Brix/Conc.
  • Meets 3A Sanitary Standard and tested for CIP clean-ability according to EHEDG.
  • Withstands CIP cleaning.
  • Completely digital system: particles and bubbles do not affect operation or accuracy.
  • Patented CORE-optics: no drift, no re-calibration, no mechanical adjustments.
  • Includes an Ethernet communication solution for data-logging. Together with the user’s own
    procedural and administrative user controls this facilitates electronic data records for FDA 21
    CFR Part 11 adherence.
  • Effective heat transfer and isolation using Teflon® and ceramics in the sensor provide safe
    operation also in higher process temperatures (max. 130 °C/266 °F.
  • Fast process temperature measurement by built-in Pt1000 and automatic temperature
  • Calibration and accuracy traceability with easy on-site instrument verification using standard
    Refractive Index liquids.
  • PR23AC is ATEX approved for Zone II, area classification EX II 3 G EEx nA II T4.
  • ATEX approved for Zones 0 and 1, area classification ATEX II 1G Ex ia IIC T4 (only Intrinsically
    safe PR-23-AC-IA with single sensor transmitter STR ).
  • FM approved for Class I, Div. 2, Groups A, B, C and D, T6.
  • CSA certified for Class I, Div. 2, Groups A, B, C and D, T4.
  • cCSAus certified for Electrical Safety, Sensor: Class I, Pollution Deg. 3; Transmitter: Class I,
    Pollution Deg. 2; Installation Cat. II.
PR23AC Refracometer is used in the following applications:
  • Pharmaceutical Chemicals
    Acetylsalicylic acid, Calcium gluconate, Glycerophosphates, Chloral hydrate, Saccharin, 
    Antihistamines, Tranquilizers, Antifilarials, Diethyl carbamazine citrate, Antidiabetics and more.
  • Active Pharmaceutical Ingredients
    Actives, Excipients, Intermediates, Raw material, Fine chemicals, and Bulk chemicals.
  • Antibiotics
    Penicillin, Streptomycin, Tetracyclines, Chloramphenicol, and Antifungals.
  • Blood Products
    Blood, Plasma, Serum, Infusion liquids, Sodium chloride, and Glucose.
  • Proteins
    Proteins and Protein buffer solutions
  • Synthetic Drugs
    Sulfa drugs, Antituberculosis drugs, Antileprotic drugs, Analgesics, 
    Anesthetics, and Antimalarials.
  • Vitamins
    Ascorbid acid, Ca-arabonate, Riboflavin, Vitamin-B, Vitamin-C Sodium 
    Pantonate. and more.
  • Synthetic Hormones
  • Syrups
    Concentrated aqueous solutions of sucrose.
  • Drugs of Vegetable Origin
    Quinine, Strychnine and Brucine, Emetine, and Digitalis Glycosides, and 
    Herbal extracts.
  • Vaccines and Sera
  • Surgical Sutures
    Glue for human tissue.
  • Acids, Bases and Solvents

Technical Details

Refractive Index RangeFull range, nD = 1.3200…1.5300
(corresponds to hot water…100 b.w.)
AccuracyRefractive index nD ±0.0002
(corresponds typically to ± 0.1% by weight)
Repeatability nD ±0.0001
(corresponds typically to ±0.05% by weight)
Speed of Response1 s undamped, damping time selectable up to 5 min
CalibrationWith Cargille standard R.I. liquids over full range of nD 1.3200…1.5300
CORE-OpticsNo mechanical adjustments (US Patent No. US6067151)
Digital Measurement3648 pixel CCD element
Light SourceLight emitting diode (LED), 589 nm wavelength, sodium D-line
Temperature SensorBuilt-in Pt-1000, linearization according to IEC 751
Temperature CompensationAutomatic, digital compensation
Instrument VerificationAccording to ISO 9000 quality system: NIST traceable with standard R.I. liquids and Transmitter’s menu guided procedure and report for printing
Ambient TemperatureSensor: max. 45°C (113°F), min. -20°C (-4°F)
Indicating transmitter: max. 50°C (122°F), min. 0°C (32°F)
Sensor PR-23-AC
Process ConnectionSanitary 3A-clamp 2.5″
Process Temperature-20°C…130°C (-4°F…266°F)
Surface Roughness, OptionRa 0.4μm (15μ inch)
Process Wetted Part StandardAISI 316L stainless steel, prism spinel, prism gaskets PTFE (teflon), EPDM
Sensor Protection ClassIP67, Nema 4X
Sensor Weight2.0 kg (4.4 lbs)
Laboratory Test Cuvette LTC
for Off-line Laboratory Testing
AISI 316 L stainless steel laboratory test cuvette for manual and static sampling. Contains an agitator with PTFE (teflon) stirrer, and connections for sample inlet and outlet, and 1/4″ tube connections for thermostat controlled water
Pharma Mini Flow Cell PMFCFor in-line testing of low volume samples in pilot conditions, process connection Sanitary 3A-clamp 1,5″, electropolished wetted parts material with surface roughness of Ra 0.4μm (15μ inch)
Indicating Transmitter DTR
Display320×240 pixel graphical LCD with LED backlight
Keypad18 membrane keys
Current OutputTwo independent current sources,
4-20 mA, max. load 1000 Ohm,
galvanic isolation 1500 VDC or AC (peak),
hold function during prism wash
Ethernet Connection10/100 Mbit/s, data acquisition over UDP/IP Protocol with K-Patents data logging software
PowerAC input 100-240 VAC/50-60 Hz, optional 24 VDC, 30VA
Alarms / Wash RelaysTwo built-in signal relays, max. 250 V/3 A
Sensor ConnectivityOne or two sensors can be connected to the DTR. Sensors independent of each other: own parameter sets and usable in different applications. Two current outputs configurable independently to indicate process concentration or temperature of either sensor.
Transmitter Protection ClassEnclosure IP66, Nema 4X
Enclosure MaterialStandard: Polycarbonate, optional: AISI 304 stainless steel
Indicating Transmitter Weight4.5 kg (10 lbs)
Interconnecting CableIEC 61158-2 compliant two-wire cable
Interconnecting Cable LengthStandard 10 m (33 ft), max. 200 m (660 ft)

Note: Specification are subject to change without notice.