Vortex Flow sensor VA Di Ex-d (3) Materials in contact with the medium Design Material ... GE ... stainless steel 1.4571, ceramics ... GT ... titanium 3.7161, ceramics ... GH ... Hastelloy 2.4610 (HC4), ceramics ... GL ... tantalum, ceramics (4) Measuring range Di flow rate V/t average flow velocity v
m interrelationship [mm] [m³/h] [m/s] v
m -V/t 25 0.7 ... 44 0.4 ... 25 1m/s = 1.77 m³/h 40 1.8 ... 135 0.4 ... 30 1m/s = 4.52 m³/h 50 2.8 ... 212 0.4 ... 30 1m/s = 7.07 m³/h 80 7.2 ... 724 0.4 ... 40 1m/s = 18.1 m³/h 100 11.0 ... 1131 0.4 ... 40 1m/s = 28.3 m³/h Measurement <1%of measured value + 0.3 % of terminal value (at +20 °C / 1000 hPa) uncertainty Repeatability ± (0.2 % of measured value + 0.025 % of terminal value) Input/output sections in order to achieve as great a measurement accuracy as possible, an input/output section of 20/10 x Di is recommended. The input section can be reduced considerably by using a flow rectifier (see Accessories). Further information on this subject can be found in the Operating Instructions U283_VADi_B_e. (5) Max. working pressure up to 10 bar / 1 MPa overpressure (6) Design as in Drawing 1 (7) Ex-protection for gas : Ex II 1/2 G Ex d e [ia] IIC T6 for dust : Ex II 1/2 D Ex iaD20/tDA21 IP6X TX sensor for application in Category 1 (Ex-Zone 0 or 20), transducer housing for application in Category 2 (Ex-Zone 1 or 21) Ex-d transducer housing Dimensions outside diameter/length/height: approx. 110/205/182 mm Material die-cast aluminium max. 0.5 % Mg, coated Type of protection IP68, IEC 529 and EN 60 529 Connection bush for shielded cables with external diameter 5 ... 9 mm, contacting of the overall shielding on the earth terminal in the housing; connection via screw-type terminals Ex-e for wires with cross-section 0.14 1.5 mm² Alignment to connection housing rotatable by approx. 350 ° and lockable sensor Setup dual chamber system, consisting of 1) electronics in Ex-d protection (pressure-resistant casing) and 2) connections in Ex-e protection (increased safety) with terminal block and bush U350_VADi Exd_DoP_e_070604 http://www.hoentzsch.com 3/6