Atago PRM-100Α



These in-line models can be incorporated in piping of manufacturing plants, liquid mixing devices, and washing apparatuses to continuously measure the concentration of various liquids.   
They are suitable for use in the control of mixing, concentration, fermentation, and control of the concentration of water-based or alkali-based detergent, etc.
Refractometer Type Inline Process
RI Range 1.32 to 1.557 nD
RI Accuracy ± .0001 nD
Brix Range 0 to 100 %
Brix Accuracy ± .05 %
Temperature Measurement Range 5 to 100 °C (Clean-in-process (CIP) up to 130°C for no more than 30 minutes)
Refractometer Interface RS-232C
Power Requirements AC 100 to 240V, 50 / 60Hz
Weight 3.3 kg (detection section)
Additional Specifications Minimum Indication    
Refractive index (nD):   
0.0001 or 0.00001   
0.1% or 0.01% (by selection)   
Alarm output:    
Open-collector output for high and low limit settings (alarm output)   
International Protection class:   
Detection section IP66, Calculation Display section IP65   
Included Accessories:    
Detection section - display section connecting cable (Standard 15m)   
Recorder output cable (4-20mA) (Standard 10m)   
Clamp band (for use in mounting a sample inlet unit)   
O-ring (for use in mounting a sample inlet unit)   
RS-232C Output Cable (Standard 10m) : RE-65301   
Alarm Output Cable (Standard 10m) : RE-65302   
* Calibration Certificate : Contact an ATAGO representative for details.   
Dimensions & Weight    
Detection section:    
12.8 × 26.6 × 12.8cm, 3.3kg   
Calculation Display section:    
19.2 × 10 × 24cm, 3.3kg


The unit measures the refraction of light generated between the prism surface and a liquid sample. The PRM-100Α is upgraded from the PRM-85 in the following aspects:   
  • Wider than ever 0.0 to 100.00% Brix range   
  • Improved measurement accuracy: Brix ±0.05%, nD ±0.00010   
  • Two options for setting the minimum indication decimal place   
  • Simple two-piece construction: detection section and operation display section   
  • Easy-to-read color display panel.   
Simply attach the unit to a piping system to monitor food or beverage production, pharmaceutical production, industrial fluid, washing devices, dilution/mixing devices, etc. Continuously monitor water content and mixing ratio with successive measurements of refractive index, Brix, or concentration.   
*The prism is specially designed to prevent solid materials from collecting on the surface, even after extended periods of use.


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