What products are involved?
SRV – Inline Viscosity Meter | SRD – Inline Density & Viscosity Meter | DVP | DVM
What is the purpose of this article?
To give an overview of all certificates and approvals available for Rheonics sensors, systems, and electronics, and to help you identify the right one for your application or region.
TABLE OF CONTENTS
Two types of certificates — understanding the difference
Two kinds of documents are often confused. It helps to separate them before looking at specific certificates:
| Type | What it certifies |
|---|
| Calibration certificate | The measurement accuracy of an individual unit (tied to its serial number). |
| Compliance / approval certificate | The product's design, safety, and regulatory conformity — not the calibration of a specific unit. |
1. Calibration certificates
Every Rheonics sensor is factory-calibrated to NIST-traceable viscosity and density standards. A standard calibration certificate ships with every unit. A detailed per-unit certificate (option CUS/VCAL2) is available on request — order it together with the sensor to avoid additional charges.
2. Hazardous-area approvals (Ex)
Rheonics SRV and SRD probes are intrinsically safe and approved across the major regional explosion-protection schemes for use where flammable gases, vapours, or dust may be present:
| Approval | Region |
|---|
| ATEX | European Union |
| IECEx | International |
| JPEx | Japan |
| KCs | Korea |
| cULus HazLoc | United States and Canada (see Section 3) |
Ratings, zones, temperature classes, certificate numbers, and installation guidance are covered in the dedicated Ex articles.
3. North America approvals (cULus)
Rheonics products are available with cULus approval, giving Nationally Recognised Testing Laboratory (NRTL) acceptance for the United States and certification for Canada. It covers two scopes:
| Scope | Application |
|---|
| Ordinary Locations (OrdLoc) | General electrical product-safety listing for non-classified areas. |
| Hazardous Locations (HazLoc) | Classified hazardous areas in the US and Canada, under both the Class/Division and Zone systems. |
| ⚠ Note: cULus is newly available. If it is not yet listed on the Certificates page, contact Rheonics Support for the current certificate and product-specific markings. |
4. Hygienic and food-safety certifications
For food, dairy, beverage, and pharmaceutical processes:
| Certification | Scope |
|---|
| EHEDG | European hygienic design certification; supports clean-in-place (CIP). |
| 3-A Sanitary Standards | Sanitary design approval recognised primarily in North America. |
| FDA food-contact materials | Confirms wetted materials are suitable for food contact. |
5. Quality and general conformity
| Certificate | Scope |
|---|
| ISO 9001 | Rheonics quality management system certification. |
| CE marking | EU conformity, including the EMC Directive (EN 61326) and RoHS, with the EU Declaration of Conformity. |
6. Which certificate do I need?
| Your situation | Look at |
|---|
| Proof a unit was calibrated / per-unit accuracy data | Section 1 — Calibration certificates |
| Installing in a classified hazardous area | Section 2 — Ex approval for your region (ATEX / IECEx / JPEx / KCs) or cULus HazLoc (US/Canada) |
| Electrical safety listing for the US or Canada (non-hazardous area) | Section 3 — cULus OrdLoc |
| Food, dairy, beverage, or pharma process | Section 4 — EHEDG, 3-A, FDA food-contact |
| EU market conformity / audit of quality system | Section 5 — CE (EMC, RoHS), ISO 9001 |
| If you are unsure which certificate your application, region, or auditor requires, contact Rheonics Support and we will point you to the right document. |
Further information
Calibration
Hazardous-area (Ex) installation
Hygienic and food-safety
EMC, CE, and sensor marking
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