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 and Hastelloy C22 for SRV and SRD, and Titanium Gr. 5 for DVP.

Material compatibility of Rheonics inline process sensors
Rheonics does not provide compatibility testing or analysis for customer fluids. Customers need to evaluate the wetted material of the sensor for their process fluids. Rheonics provides a detailed list of materials that are used in the sensing elements. The table below highlights all the materials and also their relevant codes.

Viscometer and Density Meter Material Compatibility

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 (1.4404). 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.

The next table shows the materials available for Rheonics viscometers and density meters.

Table 1: Rheonics sensors wetted materials available

Rheonics Sensor	Description	Stainless Steel Material	Hastelloy Material	Titanium Material
SRV	Rheonics Inline Viscometer	Stainless Steel 316 & 316L  Wetted parts: 1.4401/1.4404/1.4435/1.4115 Non-wetted parts: 1.4435/1.4404/1.4115 Process connection flanges are often 1.4404	Hastelloy C22 Wetted parts: C22 2.4607/2.4602 Non-wetted parts: 1.4435/1.4404/1.4115/2.8131	-
SRD	Rheonics Inline Density and Viscosity meter	Stainless Steel 316 & 316L  Wetted parts: 1.4401/1.4404/1.4435/1.4115 Non-wetted parts: 1.4435/1.4404/1.4115 Process connection flanges are often 1.4404	Hastelloy C22 Wetted parts: C22 2.4607/2.4602 Non-wetted parts: 1.4435/1.4404/1.4115/2.8131	-
DVP	Rheonics High Accuracy Inline Density and Viscosity meter	-	-	Titanium Gr. 5  Wetted and non-wetted parts: 3.7164/3.7165
DVM	Rheonics HPHT* Density and Viscosity meter	-	-	Titanium Gr. 5  Wetted and non-wetted parts: 3.7164/3.7165

*HPHT: High Pressure and Temperature

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.