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.
