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AL-CARK Caustic Analyser

AL-CARK Caustic Analyser

Rugged Process Analysers for the Minerals Processing Sector


AL-CAR-K caustic analyser is a ruggedized inline refractometer sensor that provides continuous real-time slurry liquor phase density using refractive index. Refractive index sensors (RI meters) are extensively used in many process environments in industries such as sugar, pulp, and paper, chemical and food. This RI meter has been adapted to cater for measurement obstacles which are created by the rigors of the alumina process such as scaling and erosion.


  • Precise in-line real-time monitoring of slurry liquor-phase density
  • Density of the slurry liquor phase  is  independent of suspended solids or mud
  • Rugged probe designed specifically for the Alumina Industry
  • Reliance on lab sampling for caustic and A/C control is greatly reduced
  • Operators can respond immediately to process disturbances and have near immediate feedback of changes initiated
  • Closed loop feedback control for caustic liquor dilution loops is absolutely achievable


  • Unique design with completely digital sensing techniques: not moving parts
  • Jacking bolts to facilitate removal from the process
  • Digital transfer of data between the sensor and the indicating transmitter
  • Temperature compensation for changes in process temperature
  • Rugged all stainless steel external design
  • SAF2205 wetted parts with a PSZ ceramic tip.  Optical exotic wetted parts available.


The AL-CAR-K RI meter is suited for red and white side alumina processes. This refractometer sensor can be used to monitor liquor-phase density in areas such as the Digestion Blow Off (DBO)/Last Flash Tank and precipitation feed to provide accurate and repeatable control point measurements, resulting in large savings in production costs. In applications where the A/C ratio or molar ratio varies significantly, we recommend using the ALCAR-K in line refractometer sensor in conjunction with a conductivity device (AL-DCIK) or periodic lab sampling to assist in complete concentration control.

The AL-CAR-K  caustic analyser is also suitable for measurements of pressure acid leach (PAL) blow off in nickel refining. By monitoring the dissolved liquor components, free acid can be calculated and controlled. This impacts on pH levels resulting in fewer trace metals in the pregnant liquor as well as decreasing acid usage whilst increasing production with less downtime.

Precision Light and Air Offices

Precision Light and Air Australia
(Head office)

17 Sir Laurence Drive
Seaford Vic 3198
Phone: +61 3 9786 1711

Precision Light and Air North America (sales office)

Contact: Patrick Morgan
Phone: +1 876 381 0125
Fax: +1 876 963 0313

Nanjing Precision International Corp

Contact: Matt Chen
Level 6, Unit 2, Building 21
Yangzi Kechuang Headquarte
5 Pudong North Rd, Pukou District, Nanjing
P.R.China. 210031
Phone: +86 139 0515 8762


Utah and Surrounding States

Process Technology
4084 South 300 West
Salt Lake City, Utah 84107

South America: AS-Chile

Contact: Ruben Morales Aravena
Telefono: +56 2 277 7480


Yellow Solutions
Office phone: +55 19 3461 0525
Office address: Rua Castanheiras, nº 156, Jd. São Paulo - Americana – SP
Web address:


Contact: Sergio Burelli
Phone: +27 (0) 11 568 2092
7 Sam Green Road
Tunney, Germiston 1401, South Africa