Rheonics Support

What products are involved?
Rheonics inline SRV viscometer and density meters and viscometers SRD, DVP and DVM. 

What is the purpose of this article?
Provide overview of chemical fluids compatibility with the Rheonics sensor materials, such as Stainless Steel 316L (1.4435) and Hastelloy C22 (2.4602) for SRV and SRD, and Titanium Gr. 5 (3.7165) for DVP.

1. Introduction

Rheonics sensors measure a fluid´s viscosity and density based on a balanced torsional resonator in the probe, that needs to be completely immersed in the fluid of interest. 

The most used wetted material of Rheonics probes is Stainless Steel 316L (1.4435). This is an austenitic chromium-nickel-molybdenum stainless steel variant that has a low carbon content, leading to a greater resistance to corrosion. 

Rheonics Stainless Steel surface is compatible with most of the fluids used in the industry to control and monitor viscosity and/or density. However, certain chemical fluids will behave as strong acids or bases. In those cases, care should be taken to not expose the Stainless Steel sensor probe to those fluids and instead, look for other wetted materials offered by Rheonics.

Next table shows the standard and alternative wetted materials available for Rheonics viscometers and density meters.

Table 1: Rheonics sensors wetted materials available

Rheonics Sensor	Description	Standard Material	Alternative Material
SRV	Rheonics Inline Viscometer	Stainless Steel 316L (1.4435)	Hastelloy C22 (2.4602)
SRD	Rheonics Inline Density and Viscosity meter	Stainless Steel 316L (1.4435)	Hastelloy C22 (2.4602)
DVP	Rheonics High Accuracy Inline Density and Viscosity meter	Titanium Gr. 5 (3.7165)	-
DVM	Rheonics HPHT* Density and Viscosity meter	Titanium Gr. 5 (3.7165)	-

*HPHT: High Pressure and Temperature

Note: Hastelloy C22 material is available for flush, short and hygienic long insertion probe of the SRV and SRD sensors.

Next, a compatibility table is shown for some common chemical fluids. This table is for reference only. It is recommended that the user conducts controlled tests before final installation of the sensors if final application involves chemicals that are not already known to be suitable for the sensor wetted material. Consider as well that concentration levels, temperature and pressure are important parameters for chemical fluids and can lead to even more corrosive characteristics.

Table 2: Rheonics viscometers and density meters material chemical compatibility.