This Flowmeter is based on the variable area principle
The Flowmeter Type 785 is based on the variable area principle.
The position of the top of the float against the scale on the tube shows the flow rate level. In addition to the visual readout, this flowmeter may be fitted with minimum and maximum limit switches, or with a transmitter.
Technical Data :
Temperature range : Tube Material Trogamid = 60 °C Tube Material Polysulfon = 60 °C End Connections uPVC = 100 °C End Connections Malleable Iron = 100°C End Connections Stainless Steel = 100 °C
´O´ Ring Seals :
EPDM or FPM.
Float Material :
Stainless Steel or PVC.
Accuracy Class :
2,5 according to VDE/VDI 3513 Sheet 2 e.g. +/- 0,625 % of end-scale, +/- 1,875 % of measured value, inaccuracy in l/hr resp. m³/hr.
Maximum Pressure :
10 bar bei Trogamid with PVC end connections. 16 bar bei Polysulfon with metal and connections.
Standard Scales :
l/hr and m³/hr based on water at 20 °C or % scale. Special scales available on request.
Limit Switches (K) and Transmitter (FG) :
Limit switches or a continuous transmitter may be fitted to the flowmeter tube. When these accessories are used a magnetic floater must also be used.
Installation Details :
Controlled System : When the flowmeter is used in a system with valve control the following criteria must be observed: 1) With liquid flows the valve can be fitted before or after the flowmeter 2) With gases, the valve must be fitted after the flowmeter.
Important! The floater in the flowmeter reacts very sensitively to any change in flow rate, therefore any valve setting adjustment must be gradual and slow.
