Process Analyzer

Vaisala K-PATENTS® Saunders Body Refractometer


pr23w saunders body refractometer


Vaisala K-Patents PR23W Saunders Body Refractometer  is designed for use in chemically aggressive solutions and ultra-pure fine chemical processes in large-scale production and in large pipelines. Installation through a flange or a clamp connection. Area classification Zone 2 (Class I, Div. 2); Intrinsically safe process refractometer PR-23-W-IA Area classification Zone 0 and Zone 1.

PR23W Refractometer comes together with Saunders (Diaphragm) valve body that can be mounted horizontally or vetically. 

  • PR23W Refractometer comes with a Saunders (DIAPHRAGM) valve body and can be mounted either in a
    vertical or horizontal pipe.
  • Saunders body material is graphite cast iron, which provides a solid mechanical base.
  • PFA-lining ensures the chemical resistance.
  • Sensor wetted parts materials are Spinel or Sapphire (prism), PTFE (prism gasket),
    PVDF or PTFE (Teflon®).
  • Sensor cover is stainless steel AISI 316L
  • Digital sensing technology, even large amounts of suspended solids, bubbles or Color changes do
    not affect the measurement or the curacy.
  • Chlor-Alkali Industry
  • Corrosive Chemicals
  • Ultra Pure Fine Chemicals
  • Semiconductor Industry and Electro-Chemicals
  • Acetic acid CH3COOH, Ammonium fluoride NH4F, Ammonium hydroxide NH4OH, Ammonium
    sulphate (NH4)2SO4
  • Calsium hypochlorite Ca(ClO)2, Copper chloride CuCl2, Citric acid C6H8O7, Chromic acid CrO3
    Ferric chloride FeCl2, Fluosilic acid, Formic acid HCO2H
  • Hydrochloric acid HCl, Hydrofluoric acid HF, Hydrogen peroxide H2O2, Buffered HF
    (BHF), Aqua Regia HNO3/HCl
  • Lactic acid C2H4(OH)COOH
  • Magnesium chloride MgCl2, Nickel chloride NiCl2, Nitric acid HNO3
  • Phosphoric acid H3PO4, Potassium carbonate K2CO3 · 11/2 H2O, Potassium hydroxide KOH,
    Potassium thiocyanate KSCN, Potassium nitrate KNO3
  • Sodium bicarbonate NaHCO3, Sodium carbonate Na2CO3, Sodium chloride NaCl, Sodium
    dichromate Na2Cr2O7 · 2H2O, Sodium hydroxide NaOH, Sodium hypochlorite NaClO2, Sulphuric
    acid H2SO4 and more.

Technical Details

Refractive Index Range (Standard)StandardFull range, nD=1.3200…1.5300 (corresponds to 0…100% b.w.), spinel prism
Refractive Index Range (Option)nD=1.2600…1.5000, sapphire prism
AccuracyR.I. ± 0.0002 (corresponds typically to ± 0.1% b.w.).
Repeatability and stability correspond to accuracy
Speed of Response1s undamped, damping time selectable up to 5 min
Patented CORE-opticsNo mechanical adjustments and digital measurement with 3648 pixel CCD element,
589 wavelength sodium D-line light emitting diode (LED), built-in Pt-1000 temperature sensor (linearization according to IEC 751)
Temperature CompensationAutomatic, digital compensation
Instrument VerificationWith standard R.I. liquids and K-Patents documented procedure (ISO 9000)
Ambient TemperatureSensor: min. -20°C (-4°F), max. 45°C (113°F)
Indicating transmitter: min. 0°C (32°F), max. 50°C (122 °F)
Sensor HousingAISI 316 L stainless steel sensor cover
Sensor Protection ClassIP67, Nema 4
ExproofExproof by purging
PatentsUS Patents US6067151 and US6760098B2, German Patent DE19855218
Sensor PR-23-WProcess connection with PFA (Fluorinated ethylene propylene) lined Saunders (diaphragm) valve body 2″, 3″ or 4″; valve body material Graphite cast iron
Saunders Body Process
DIN-flange DN50 PN 16/DIN-flange DN80 PN 16/DIN-flange DN100 PN 16/ ANSI- flange 4″ 150 lbs/ANSI-flange 3″ 150 lbs/ANSI-flange 2″ 150 lbs
Sensor Wetted PartsTeflon® PTFE, prism gasket Teflon® PTFE,
prism spinel or sapphire, O-ring Kalrez, adaptor sapphire
Sensor WeightWith 2″ Saunders body 15 kg (33 lbs)/3″ 26 kg (57 lbs)/4″ 33 kg (73 lbs) Process pressure: max. 10 bar (145 psi)
Process PressureMax. 10 bar (145 psi)
Sensor PR-23-MProcess connection with Thread G1/2″ (F) or Thread NPT 1/2″ (F)
Sensor Wetted PartsTeflon® PTFE or Kynar® PVDF, prism gasket Teflon®, prism spinel (standard), O-ring Kalrez, adaptor sapphire
Sensor Weight5.5 kg (12 lbs)
Indicating Transmitter DTR
Display320×240 pixel graphical LCD with LED backlight, keypad with 8 membrane keys
Current OutputTwo independent current outputs, 4-20 mA, max. load 1000 Ohm, galvanic isolation 1500 VDC or AC (peak), hold function during prism wash
Ethernet ConnectionTwo independent current outputs, 4-20 mA, max. load 1000 Ohm, galvanic isolation 1500 VDC or AC (peak), hold function during prism wash
PowerAC input 100-240 VAC/50-60 Hz, optional 24 VDC, 30 VA
Alarms / Wash RelaysTwo built-in signal relays, max. 250 V/3 A
Sensor ConnectivityOne or two sensors can be connected to one DTR.
Sensors independent with own parameter sets and usable in different applications.
Two current outputs configurable independently to indicate process concentration or temperature of either sensor.
Indicating Transmitter Weight4.5 kg (10 lbs)
Transmitter Protection ClassEnclosure IP66, Nema 4X
Interconnecting CableStandard 10 m (33 ft), max. 200 m (660 ft)
OptionsCable fittings to Indicating transmitter European cable glands M20x1.5 or US conduit hubs

Note: Specification are subject to change without notice.