CAV controllers Type RN-Ex
Circular, mechanical self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems, approved and certified for potentially explosive atmospheres (ATEX)
Application
Special characteristics
Useful additions
Construction features
Materials and surfaces
Galvanised sheet steel constructionClassification
According to type examination certificate TÜV 05 ATEX 7159 XNominal sizes
80, 100, 125, 160, 200, 250, 315, 400Variants
Construction
Parts and characteristics
Standards and guidelines
Maintenance
Maintenance-free, as construction and materials are not subject to wear and tearAccessories
Functional description
The volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with low- friction bearings is adjusted by aerodynamic forces such that the set volume flow rate is maintained within the differential pressure range.
The aerodynamic forces of the airflow create a closing torque on the damper blade. The bellows extends and increases this force while at the same time acting as an oscillation damper. The closing force is countered by a leaf spring that unrolls over a cam plate. The shape of the cam plate is such that a change in the differential pressure leads to an adjustment of the damper blade in a way that the volume flow rate is maintained almost exactly.
Efficient commissioning
The volume flow rate setpoint value can be set quickly and easily using the pointer on the external scale; no measurements are required.
The advantage over flow adjustment dampers is that there is no need for repeat measurements or adjustments by an air conditioning engineer. Should the system pressure change, e.g. by opening or closing of duct sections, the flow rates in the entire system will also change if flow adjustment dampers are used; however, this is not the case with mechanical self-powered volume flow controllers A mechanical self-powered controller reacts immediately and adjusts the damper blade such that the set constant volume flow rate is maintained.
Nominal sizes | 80 – 400 mm |
Volume flow rate range | 11 – 1400 l/s or 40 – 5040 m³/h |
Volume flow rate control range | Approx. 25 – 100% of the nominal volume flow rate |
Scale accuracy | ± 4 % |
Minimum differential pressure | 50 Pa (nominal size 80: 100 Pa) |
Maximum differential pressure | 1000 Pa |
Operating temperature | 10 – 50 °C |
This tender text describes the general properties of the product. Texts for variants are generated by our Easy Product Finder design programme.
Volume flow controller in round design for constant volume flow systems in potentially explosive atmospheres, mechanically automatic, without auxiliary power, for supply air or extract air, in eight nominal sizes.
Controller ready for commissioning, consisting of the housing with smooth-running control damper, control bellows and external cam disc with leaf spring as well as components for equipotential bonding and explosion protection.
Volume flow controllers are factory-set to a reference volume flow (setting of the desired volume flow on site by the customer). Spigot with insert bead for lip seal, suitable for air ducts to EN 1506 or EN 13180.
Casing air leakage according to EN 1751, class C.
5 Accessories
No entry: without accessories
D2 Double lip seal both ends
Order example: RN-Ex/160/D2
Nominal size | 160 |
Material | Galvanised sheet steel |
Accessories | Lip seals on both ends |
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We are here for you
Please specify your message and type of request.
Tel.: +43 1 250 43-0 | Fax: +43 1 250 43 34
Contact
Thank you for your message!
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Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +43 1 250 43-0| Fax: +43 1 250 43 34
