Gemue 815 Variable area flowmeter for liquids, PP float with magnet, DN 20–65
The Gemue 815 is the variable area flowmeter of the 800 series with a PP float and magnet, designed for liquids in nominal sizes DN 20, DN 25, DN 32, DN 40, DN 50 and DN 65. It measures purely mechanically, without auxiliary power, and shows the flow directly on the metering tube. Compared with the Gemue 805, which carries the same float without a magnet, what is added here is contactless evaluation of the float position: the moulded-on dovetail rails can hold limit switch and signalling units as well as setpoint pointers. As an authorised dealer we stock 1,642 versions of this group.
Scale, unit and measuring range
Of the 1,642 versions, GEMÜ lists a measuring range for 1,180, and it comes in two units: 875 versions are scaled in litres per hour, from 0.5 to 6,000 l/h, a further 226 in cubic metres per hour, from 0.2 to 13 m³/h; 78 carry a percentage scale from 10 to 100 %, plus a single version in US units (gph). Which unit is printed on the metering tube is not a matter of conversion but part of the version — to read in m³/h you need a device printed accordingly. The metering tube size appears as a cone in the type code: 19 sizes from cone 46 to cone 77; together with the nominal size it determines which range is attainable. The reading is taken at the upper edge of the float. For the remaining versions GEMÜ does not list a measuring range; we clarify which scale is fitted on request, using the type code.
Medium, concentration and seal material
The scales are calibrated for three media: water (790 versions), sodium hydroxide (166) at 30 % and 50 % and hydrochloric acid (153) at 30 %. The hydrochloric acid versions are the substantive difference from the Gemue 817, which does not offer them. Which medium applies is held as a separate attribute on the article; the concentration is not supplied in GEMÜ’s search index, so we took it from the product data sheets. Sealing is by O-rings in EPDM (1,182), FPM (446) and FEP encapsulated (13). With alkalis and acids the choice of material is not a detail but the actual selection criterion: seal material and metering tube material together determine which medium is permissible. One version is a special design for oxygen; for it the medium temperature is limited to 60 °C and there is no BAM approval. All 1,642 versions conform to RoHS.
Metering tube, connections and traceability
The metering tube is available in three materials: PSU (775), PA transparent (712) and PVC-U transparent (154). Clear PA and clear PVC-U make the float easy to see, PSU is the mechanically more robust material. Connection is made via 15 connection types: union ends with inserts to DIN as a socket, for butt welding or IR butt welding, as a female thread Rp and in inches to BS, plus spigots to EN 10357, ISO 1127 and DIN 11866, clamp connections and flanges. For the connection parts there are 12 material combinations, mostly with inserts in PVC-U, PP, PE or PVDF; a variant entirely without insert and union nut is also available. In every version the body is a straight through tube. In 8 versions a CONEXO RFID chip is integrated, allowing the device to be identified electronically and traced over its service life.
The 800 series at a glance
The 800 series is organised by two features: the float material and whether the float carries a magnet. PVC without a magnet is the Gemue 801, with a magnet the Gemue 811; PP without a magnet the Gemue 805, with a magnet this 815; 1.4571 stainless steel without a magnet the Gemue 807, with a magnet the Gemue 817. The Gemue 806 carries a guided stainless steel float. The PVDF variants 820 and 822 are not in our shop; they are available on request. Only the magnet versions can be fitted with limit switch and signalling units — anyone who wants to monitor the flow rather than just read it needs one of them. There is no nominal size below DN 20 in the 800 series; the 850 series starts at DN 10 instead, with the Gemue 855 without and the Gemue 865 with a magnet. For air rather than liquid the Gemue 875 for air is the one to use, and the matching accessories are under Gemue accessories for flowmeters. All series at a glance: Gemue brand page.
Your Benefits With Us
- Worldwide shipping of all valves and measuring devices
- Large stock levels for many products – current lead time available on request
- Spare parts and service kits available
- Fast shipping via UPS (parcel) or freight forwarder (pallets), express delivery available on request
- Extensive hands-on application know-how
- Personal advice on selecting the right component
