SRD
Inline process density meter and viscometer
online, real-time fluid density meter with viscosity
- Single instrument for simultaneous process density (specific gravity), viscosity and temperature measurement
- Compact form-factor for simple installation
- Real-time, stable, repeatable and reproducible measurements in Newtonian & non-Newtonian fluids
- Measures kinematic and dynamic viscosity
- All metal construction
- Completely insensitive to mounting conditions
- Operational up to 1500 bar and 285°C (20,000 psi, 545 °F)
- Threaded, flanged and sanitary process fittings
- Easy to clean, no maintenance or re-configurations needed
- Scale across multiple locations/installs without application re-engineering
316L Stainless Steel
Hastelloy C22
| Density Range | 0.0 - 4.0 g/cc 0.0 - 4000 kg/m3 0.0 - 33.38 lb/gal |
| Density Accuracy | 0.01 g/cc (0.001 g/cc & higher accuracy available) |
| Viscosity Range | 1 to 3,000 cP (standard) Wider range available |
| Viscosity Accuracy | 5% of reading (standard) 1% & higher accuracy available |
| Reproducibility | Better than 1% of reading |
| Temperature | Pt1000 (DIN EN 60751) |
| Process Fluid Temperature | -40 up to 285 °C (575°F) |
| Ambient Temperature | -40 up to 150 °C |
| Pressure Range | up to 20,000 psi (1500 bar) |
| Fluid Wetted Materials | 316L Stainless steel Hastelloy C22 |
- The rheonics density meter SRD measures viscosity and density by means of a balanced torsional resonator, one end of which is immersed in the fluid under test.
- Density of fluid is measured through the shift in resonant frequency of the resonator.
- The more viscous the fluid, the higher the mechanical damping of the resonator. By measuring the damping, the product of viscosity and density is calculated by rheonics’ proprietary algorithms.
- Density and viscosity of fluid is measured by the rheonics patented sensing and evaluation electronics and stable, high accuracy and repeatable readings are obtained based on rheonics’ proven gated phase-locked loop technology.
Sophisticated, patented 3rd generation electronics drive these sensors and evaluate their response. Ultra-fast and robust electronics, combined with comprehensive computational models, make SRDs one of the fastest and most accurate in the industry. SRD gives real time, accurate density measurements every second and is not affected by flow variations! In addition, you get real-time viscosity measurement of the fluids as well.
Communication
Acquire data in real-time. Transfer it to your computer, PLC or upload to the cloud
Standalone IP66 rated boxes to integrate into your system.
Standard PCB to integrate in your equipment panel box.
Next generation electronics in sensor head.
Ethernet, 4-20 mA, RS232 over USB.
CAN, Profinet, HART available.
Intrinsically safe EX certified density meter
| Title | Description | Link | File Category | Products | Tags | document_categories_hfilter | tags_hfilter |
|---|---|---|---|---|---|---|---|
| Article – Automated Slurry Monitoring for Investment Casting – INCAST April 2026 | Technical article published in the INCAST April 2026 issue covering automated inline slurry viscosity and density monitoring, shell quality improvement, and labor efficiency in investment casting operations. | Publications | SRD, SlurrySense | publications | |||
| Certificate – IECEx Certificate of Conformity for SRV & SRD – Issue 05 | This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the IEC Standards listed in the Certificate Issue 05 | EX Certificates, Certificates | SRV, SRD, DVM, DVP | ex-certificates certificates | |||
| Training Deck – Integration to Ignition | Training deck on Type-SR sensor UDT Configuration in Ignition | Information and Training Decks | SRV, SRD, Communication | training-deck | |||
| Certificate – RoHS 3 Conformance | This certificate is issued as verification of compliance with directive RoHS 3 | Certificates | SRV, SRD, DVM, DVP, Standard Products | certificates | |||
| Certificate – IECEx Certificate of Conformity for SRV & SRD – Issue 04 | This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the IEC Standards listed in the Certificate Issue 04 | EX Certificates, Certificates | SRD, SRV | ex-certificates certificates | |||
| Certificate – ATEX Certificate for SRV & SRD – Issue 04 | Certificate for Equipment and Protective Systems intended for use in Potentially Explosive Atmosphere – Directive 2014/34/EU – Issue 04 | EX Certificates, Certificates | SRD, SRV | ex-certificates certificates | |||
| Certificate – ATEX Certificate for SRV & SRD – Issue 03 | Certificate for Equipment and Protective Systems intended for use in Potentially Explosive Atmosphere – Directive 2014/34/EU – Issue 03 | Certificates, EX Certificates | SRD, SRV | certificates ex-certificates | |||
| Certificate – JPEx Certificate for SRV & SRD – Issue 01 | This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the JPEx Standards – Issue 01 | Certificates, EX Certificates | SRD, SRV | certificates ex-certificates | |||
| CAD Model – SRD-X5 Flange | CAD Model (STEP File), 2D PDF Drawing, DXF File of SRD-X5 with custom Flange connection | CAD Models | SRD | cad-models | |||
| Certificate – JPEx Certificate for SRV & SRD – Issue 00 | This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the JPEx Standards – Issue 00 | Certificates, EX Certificates | SRV, SRD | certificates ex-certificates | |||
| Drawing – SRD-HS-X5 – Hygienic long insertion – Flange | 2D drawing of SRD-HS-X5, 3-A EHEDG, Process Connection: Flange |
| Drawings | SRD | drawings | ||
| Manual – Ex Installation and Intrinsic Safety V3.1 | Installation and Intrinsic Safety Installation and intrinsic safety manual V3.1 for Rheonics sensors types SRV, SRV-FPC, SRD and SRD-FPC. Valid only for Issue 2 of Ex certificate. | Manuals | SRV, SRD | manuals | |||
| Certificate – 3-A viscosity and density meter and weld-in accessories | Certificate for 3-A Sanitary Standards for SRV and SRD probes and weld-in accessories | Certificates | SRV, SRD, Accessories | certificates | |||
| Teletube sensor probe parts list and assembly guide | Assembly manual for Rheonics Teletube ultra-long probe SRV and SRD | Manuals | SRV, SRD | manuals | |||
| Drawing – SR RP Reactor Probes | SRV and SRD Reactor Probes Configuration Order Drawing | Drawings | SRV, SRD | drawings | |||
| Drawing – SR SLP Slimline Probes | SRV and SRD Slimline Probes Configuration Order Drawing | Drawings | SRV, SRD | drawings | |||
| Drawing – SRD-SLP-A117-BH40 | Drawing for SRD-SLP: Density and viscosity meter Slimline Probe design with Hygienic DN40 connection. | Drawings | SRD | Technical Information | drawings | technical-information | |
| CAD Model – SRD-SLP-A117-BH40 | CAD Model (pdf, dxf, 3D step) for SRD-SLP: Density and viscosity meter Slimline Probe design. | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| Drawing – SRD-SLP in elbow DN40 | Drawing for SRD-SLP: Density and viscosity meter Slimline Probe design in a jacketed elbow DN40. | Drawings | SRD | Technical Information | drawings | technical-information | |
| CAD Model – SRD-SLP in elbow DN40 | CAD Model (pdf, dxf, 3D step) for SRD-SLP: Density and viscosity meter Slimline Probe design in a jacketed elbow DN40. | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| Rheonics EHEDG density meter and viscometer – Installation guide | Installation guidelines for EHEDG certified hygienic process density meter and viscometer – SRD and SRV | Manuals | SRV, SRD | Technical Information | manuals | technical-information | |
| Certificate – EHEDG SRD inline density and viscosity meter | Certificate for Hygienic EHEDG certified design for SRD probe | Certificates | SRD | Technical Information | certificates | technical-information | |
| CAD Model – SRD Flush Tri-Clamp | CAD Model (STEP File), 2D PDF Drawing, DXF File of SRD – Flush Tri-Clamp | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| Drawing – SME-TR Electronics option: E2 | Drawing for SME-TR: Sensor electronics in Transmitter Housing | Drawings | Electronics, SRD, DVM, DVP, SRV | Technical Information | drawings | technical-information | |
| CAD Model – SRD G1/2″ | CAD Model (STEP File), 2D PDF Drawing, DXF File of SRD – G1/2″ | CAD Models | SRD | cad-models | |||
| RFQ Request for quotation SRD density and viscosity meter | Fill out this PDF file and send it to to request a quote for the SRD. We recommend using the online RFQ form | Sales Document | SRD | Sales Information | sales-document | sales-information | |
| CAD Model- SME-TRD Electronics option: E1 | CAD Model (pdf, dxf, 3D step) for SME-TRD: Sensor electronics in Transmitter Housing with Display | CAD Models | SRD, Electronics, DVM, DVP, SRV | Technical Information | cad-models | technical-information | |
| Drawing – SME-TRD Electronics option: E1 | Drawing for SME-TRD: Sensor electronics in Transmitter Housing with Display | Drawings | SRD, Electronics, DVM, DVP, SRV | Technical Information | drawings | technical-information | |
| CAD Model – SME-TR Electronics option: E2 | CAD Model (pdf, dxf, 3D step) for SME-TR: Sensor electronics in Transmitter Housing | CAD Models | SRD, Electronics, DVM, DVP, SRV | Technical Information | cad-models | technical-information | |
| CAD Model – SME-DRM Electronics option: E3 | CAD Model (pdf, dxf, 3D step) for SME-DRM: DIN rail mount Sensor electronics | CAD Models | Electronics, DVM, DVP, SRV, SRD | Technical Information | cad-models | technical-information | |
| Drawing – SME-DRM Electronics option: E3 | Drawing for SME-DRM: DIN rail mount Sensor electronics | Drawings | Electronics, DVM, DVP, SRV, SRD | Technical Information | drawings | technical-information | |
| CAD Model – SRD Tri-Clamp | CAD Model (STEP File), 2D PDF Drawing, DXF & DWG files of SRD – Tri-Clamp | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| CAD Model – SRD Long Flange | CAD Model (STEP File), 2D PDF Drawing, DXF & DWG files of SRD – Long Flange | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| CAD Model – SRD Flange | CAD Model (STEP File), 2D PDF Drawing, DXF & DWG files of SRD – Flange | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| CAD Model – SRD NPT | CAD Model (STEP File), 2D PDF Drawing, DXF & DWG files of SRD – NPT | CAD Models | SRD | Technical Information | cad-models | technical-information | |
| Drawings – SRD – EHEDG | SRD – EHEDG (European Hygienic Engineering and Design Group) certified variants | Drawings | SRD | pharmaceutical, food, EHEDG | drawings | pharmaceutical food ehedg | |
| Drawing – SRD – Long insertion – VARINLINE | 2D drawing of SRD – FPC, Process Connection: VARINLINE |
| Drawings | SRD | Technical Information, FPC | drawings | technical-information fpc |
| Drawing – SRD – Long insertion – Triclamp | 2D drawing of SRD – FPC, Process Connection: Triclamp | Drawings | SRD | Technical Information, FPC | drawings | technical-information fpc | |
| Drawing – SRD – Long insertion – Threaded | 2D drawing of SRD – FPC, Process Connection: Threaded (G, NPT, others) | Drawings | SRD | Technical Information, FPC | drawings | technical-information fpc | |
| Drawing – SRD-X5 – Long insertion – Flange | 2D drawing of SRD-X5, Process Connection: Flange | Drawings | SRD | Technical Information, FPC | drawings | technical-information fpc | |
| Drawing – SRD – Long insertion – DIN11851 | 2D drawing of SRD – FPC, Process Connection: DIN11851 | Drawings | SRD | Technical Information, FPC | drawings | technical-information fpc | |
| Drawing – SRD – Sanitary | 2D drawing of SRD – Sanitary Process Connection |
| Drawings | SRD | Technical Information | drawings | technical-information |
| Drawing – SRD – Triclamp | 2D drawing of SRD – Triclamp Process Connection |
| Drawings | SRD | Technical Information | drawings | technical-information |
| Drawing – SRD – Flange | 2D drawing of SRD – Flange Process Connection |
| Drawings | SRD | Technical Information | drawings | technical-information |
| Drawing – SRD – NPT | 2D drawing of SRD – NPT Process Connection |
| Drawings | SRD | Technical Information | drawings | technical-information |
| Datasheet – STCM | Information and specifications about SRV and SRD Smart Thermal Control Module | Datasheets & Brochures | SRV, SRD, STCM | Technical Information | datasheets | technical-information | |
| Certificate – IECEx Quality Assessment Report for SRV & SRD | IECEx Quality Assessment Report Summary | EX Certificates, Certificates | SRV, SRD | Technical Information | ex-certificates certificates | technical-information | |
| Declaration of Conformity – Food Contact Compliance as per US FDA and EU Compliance for SRV & SRD | Rheonics’ Declaration of Conformity for Food Contact Compliance as per US FDA and EU Compliance for SRV & SRD | Certificates | SRV, SRD | Technical Information, Application | certificates | technical-information application | |
| Declaration of Conformity – CE Declaration of Conformity as per EN 61326-1:2013, EN 61326-2-3:2013 & EN 50581:2012 | Declaration of Conformity for SME-TRD, SME-TR & SME-DRM as per directives – Electromagnetic compatibility (EMC) Directive 2014/30/EU & Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS2) Directive 2011/65/EU | Certificates | SRV, SRD, Electronics, DVM, DVP | Technical Information | certificates | technical-information | |
| Certificate – ATEX Quality Assurance Notification (QAN) – German | ATEX-QAN (Quality Assurance Notification) in German – Requirements according to directive 2014/34/EU have been fulfilled | Certificates, EX Certificates | SRD, SRV | Technical Information | certificates ex-certificates | technical-information | |
| Certificate – ATEX Quality Assurance Notification (QAN) – English | ATEX-QAN (Quality Assurance Notification) in English – Requirements according to directive 2014/34/EU have been fulfilled. | Certificates, EX Certificates | SRV, SRD | Technical Information | certificates ex-certificates | technical-information | |
| Declaration of Conformity – CE Declaration of Conformity according to directive 2014/34/EU (ATEX) for SRV & SRD | Rheonics’ EU Declaration of Conformity according to directive 2014/34/EU (ATEX) and relevant standards for SRV, SRV-FPC, SRD & SRD-FPC | Certificates, EX Certificates | SRV, SRD | Technical Information | certificates ex-certificates | technical-information | |
| Certificate – ATEX Certificate for SRV & SRD – Issue 02 | Certificate for Equipment and Protective Systems intended for use in Potentially Explosive Atmosphere – Directive 2014/34/EU – Issue 02 | Certificates, EX Certificates | SRV, SRD | Technical Information | certificates ex-certificates | technical-information | |
| Certificate – IECEx Certificate of Conformity for SRV & SRD – Issue 02 | This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the IEC Standards listed in the Certificate Issue 02 | Certificates, EX Certificates | SRV, SRD | Technical Information | certificates ex-certificates | technical-information | |
| Article – Laboratory for Mechanics and Experimental Dynamics, ETH Zurich | ETH Zurich, Laboratory for Mechanics and Experimental Dynamics – Article on Dynamic viscosity and density sensing featuring Rheonics (previously Viscoteers) | Publications | SRV, SRD, DVM, DVP | Technical Information | publications | technical-information | |
| Manual – SRD | SRD Installation and Operating Instructions | Manuals | SRD | Training | manuals | training | |
| Product Portfolio – SRV, SRD, DVM, DVP | Overview of the Standard Products – Information on Specifications, Electronics, Communication, Mechanical, Dimensions, Software and installation. | Datasheets & Brochures | SRV, SRD, DVM, DVP | Marketing, Technical Information | datasheets | marketing technical-information | |
| Datasheet – SRD | Information on Specifications, Electronics, Communication, Mechanical, Dimensions, Software and installation. | Datasheets & Brochures | SRD | Technical Information | datasheets | technical-information |
