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Variable Area Switches-Plastic KSM

For liquids and gases

Measuring / switching range:

15 - 150 ... 8000 - 60 000 l/h water
0.8 - 5 ... 300 - 2500 m³/h air (0 bar rel, 20°C)
Connection: ½" ... 3½"
Material: trogamide-T, polysulfone
pmax: 16 bar
tmax: 60°C (trogamide), 100°C (polysulfone)
Accuracy: Cl. 4 according to VDI
Option: reed contact

-Description  

The KOBOLD plastic flow meters of model KSM are based on the float principle with the float moving freely without friction in the measuring tube. From nominal size DN 65 the devices are provided with a guide rod to stabilize the floats. The indication point is at the greatest diameter of the float.
The standard flow meters are supplied with a scale for water (+20 °C), a percentage scale, O-rings, two setpoint indicators and a guide rail for accessories. The measuring tube is available in polysulfone (KSM-2...) for less aggressive media or in Trogamide (model KSM-1...) for simple water or air applications.
The materials are resistant to impact, bending and compressive stresses. Optional threaded fittings can be fitted on the external threads integrally extruded at the ends. The floats are supplied with integrated magnets for operation with a bistable reed contact.

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Variable Area Flowmeter / switch V31

Measuring / switching range:
3 - 30 ... 1000 - 10 000 l/h water
36 - 360 Nl/h ... 18 - 180 Nm³/h air
Connection: G ¼ ... G 2 female thread, hose connector, glue-in connection, flange DN10 ... DN65, ANSI ½ ... 2½"
Material: glass inside protection tube
pmax: 15 bar
Temperature range: 0 ... 80°C
Accuracy class: 1.6 / 2.5
Option: contact

- Operating Principle 

The measuring element is composed of a float and a conical glass tube.
A medium flows from the bottom to the top through the measuring ring, lifting the float until the buoyancy force and the weight of the float establish equilibrium. The height of the float in the measuring ring is the measure of the flow. The flow rate is read directly from a scale inscribed on the glass.
The readings obtained apply solely to the medium for which the device has been calibrated or for a medium with the same density and viscosity.

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All Metall Variable Area Flowmeter BGK

For liquids and gases

Measuring range:

0.1 - 1 ... 20 - 200 l/h water
5.0 - 50  ... 600 - 6000 Nl/h air
Connection: flange DN10 - 25 or ANSI ½", ¾", 1"
Material: stainless steel
pmax: 40 bar (higher on request)
Temperature range: -40 ... +130°C
Contact: -25 ... +100°C, analogue output: -40 ... +100°C
Accuracy: ±3 % qG = 50 %
Option: contacts, analogue output
Protection: IP65 (EN60529)
Explosion protection: BVS 03 ATEX H/B 113

-Function 

The fluid flows from bottom to top through the meter tube of the flow meter. The float is lifted until an annular gap between the measuring cone and the float is produced which corresponds to the flow. The forces acting on the float are in equilibrium.
The height of the float resulting from the flow rate is transmitted by the permanent magnet in the float through the magnetic tracking system in a rotation to the pointer axis of the analog indicator unit.
The variable-area flowmeter consists of a stainless steel device with an integrated conical stainless steel measuring tube and a vertically movable float.

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