 |
 Output contacts 1) MSK limit switch 2) M12 angular connector 3) Variable area flow meters 4) Measuring tube 5) Magnetic float |
 Principe |
Direct measurement and visualisation of flow rate for gases and liquids:
Water treatment, industrial processes (paper, textiles, etc.), chemical and pharmaceutical industries, heating or cooling circuits.
Due to their design, which is entirely made of plastic and includes a glass tube, these flowmeters are particularly suitable for aggressive liquids and harsh environments.
The measuring principle is based on a variable area flowmeter, where the flow rate is determined by a float moving inside a calibrated conical glass tube. The borosilicate glass cone is housed in a protective casing with a viewing window.
Available versions:
| RA 77 | threaded connection DN 10 to DN 80 | |
| FA 77 | flanged connection DN 10 to DN 80 | |
| RA / FA 77-MSK1 | with limit switch (normally closed contact) | |
| RA / FA 77-MSK2 | with limit switch (normally open contact) | |
| RA / FA 77-MSKW | with changeover contact |
LIMIT SWITCHES
These flowmeters can be equipped with a magnetic float and electrical reed contacts, adjustable across the full measuring range.
| Nominal pressure rating | PN 10 at 20 °C | |
| Temperature / max pressure | PVC: max 6 bar at 40 °C PP: max 1.5 bar at 80 °C PVDF: max 5.5 bar at 80 °C |
|
| Max operating pressure | see measuring ranges | |
| Measuring range | 1:10 | |
| Accuracy class | VDE/VDI 3513 sheet 2 (08/2008) | |
| Maximum error (G) | 1.6% | |
| Linearity limit (qG) | 50% | |
| Connection RA 77 | union nut / solvent socket DIN 8063; optional thread DIN EN ISO 228-1 | |
| Connection FA 77 | flanges PN 10 according to DIN EN 1092-1 (other standards on request) | |
| MATERIALS | ||
| Housing with viewing window | PVC-CAW pipe, dark grey | |
| Fittings and inserts RA 77 | standard PVC (optional PP, PVDF) | |
| Flanges FA 77 | PVC (optional PP, UP-GF) | |
| Measuring cone | borosilicate glass | |
| Safety screen | PMMA (Plexiglas) | |
| Seals | EPDM (optional FKM) | |
| Float for liquids¹) | standard PVC red (optional stainless steel 1.4571, PP, PVDF) | |
| Float for gases¹) | standard PVC red (optional anodised aluminium, PP, PVDF) | |
| For limit switch versions | PVC red float with magnetic core | |
¹) Floats are unguided for small sizes; from size 30 partially guided with a guide rod. Detailed tables available on request.
