-
Technical Specifications
| Nominal diameter(mm) | 15、20、25、32、40、50、65、80、100、125、150、200、250、300、(300～1000 plug-in) | |
| Nominal Pressure (MPa) | Clamping flange connection | DN15~DN50，≤4.0MPa DN65~DN100，≤2.5MPa DN125 or above, ≤1.6MPa |
| Flange connection | DN15~DN50，≤2.5MPa DN65~DN300，≤1.6MPa | |
| Use condition | Operational temperature | Std：-40～100℃ KST-M：-40～250℃ KST-HC：-40～330℃(Agreement order) |
| Environmental temperature | -20℃～55℃ | |
| Relative humidity | 5%～90% | |
| Atmospheric pressure | 86～106kPa | |
| Material | Body | 304(Other materials are supplied by agreement) |
| Integrator housing | Die Casting Aluminum | |
| Allowable vibration acceleration | Piezoelectric type:0.2g | |
| Accuracy | ±1%R，±1.5%R；Plug-in：±2.5%R | |
| Range ability | 1：6～1：25 | |
| Supply voltage | Sensor：DC +24V；transducer：DC +24V；battery-powered：3.6Vbattery | |
| Output signal | Pulse output；4～20mA current、RS485（modbus- RTU agreement）and so on | |
-
Applications
District heating and energy metering
Gas and compressed air systems
Chemical and pharmaceutical industries
Environmental protection and emissions monitoring
Metallurgy and steel plants
Textile and paper industries
Water supply and drainage systems
-
Measuring principle
The vortex flow meter works on the principle of the generated vortex and the relation between vortex and flow by the theory of Karman and Strouhal, which specializes in the measurement of steam, gas, and liquid of lower viscosity. As shown in the below illustration, the medium flows through the bluff body, and then vortex is generated, vortices are alternately formed on both sides with opposite directions of rotation, Vortices frequency is directly proportional to medium velocity. Through the number of vortices that are measured by the sensor head, medium velocity is calculated, plus flow meter diameter and the final volume flow comes out.
Computational formula is as follows:
F=St*V/md ………………………………………………… Formula 1
Q=3600*F/K ………………………………………………… Formula 2
M=Q*ρ ……………………………………………………… Formula 3
Among Formula:
F…… Fluid flow through the bluff body generates the frequency of vortex (Unit: Hz)
St… Strouhal constant ( zero dimension )
V……Mean velocity of fluid inside the pipeline (Unit: m/s)
m……The ratio between the Lune Circulation area of the bluff body at both sides and cross-sectional area ( Unit: zero dimension )
d…… The upstream face width of the bluff body inside the vortex flow meter Unit: m )
D…… Inside diameter (ID) of vortex flow meter (Unit: m )
Q…… Instantaneous volume flow (Unit: m 3 / h )
K…… Instrument coefficient of vortex flow meter (Unit: pulses / m 3 )
M…… Instantaneous mass flow (Unit: kg/ h )
ρ……. Fluid density (Unit: kg/ m 3 )
Note: vortex flow meter "K" coefficient corresponds with one diameter, the exact ''K" value
should be calibrated in practice. Viz. one cubic meter fluid through sensor output numbers of pulse under working conditions.
