In-line Refractometer PRM-100α

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.


Model PRM-100α
Cat.No. 3574
Measurement item Refractive Index (nD), Brix, concentration (%),temperature.
Range Refractive index (nD) : 1.32000 to 1.55700
Brix : 0.00 to 100.00%
Resolution Refractive index (nD) : 0.0001 or 0.00001
Brix : 0.1 or 0.01%
Accuracy Refractive index : ±0.00010
Brix : ±0.05%
Temperature compensation 5.0 to 100.0゚C
Wetted parts temperature resistance 5 to 150゚C
High and low limit setting High and low control limits can be set with keys.
Output RS-232C, DC4 to 20mA
Alarm output Open-collector output for high- and low-limit settings (alarm output).
Cable Detection section – Display section (power supply 12V and RS-485)
Length: standard 15m (maximum up to 200m)


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