KOBOLD Instruments Inc • 1801 Parkway View Drive • 15205 Pittsburgh, PA • Tel: +1 412 788 2830 • E-mail: Please activate JavaScript visit koboldusa.com

bgn-durchfluss.png: Full Metal Variable Area Flow Meter / Counter BGN

Full Metal Variable Area Flow Meter / Counter BGN

For liquids and gases

Measuring / switching range:

0.5 - 5 ... 13 000 - 130 000 l/h water
0.015 - 0.15 ... 240 - 2400 Nm³/h air
Connection: flange DN15 ... DN150, ANSI ¾ ... 6"
Material: stainless steel 1.4404, PTFE-lining, Hastelloy®
pmax: PN40 (16) bar
tmax: 350°C
Accuracy: ±1.6 % of full scale (Gases: ±2 % of full scale)
Options: contacts, analogue output, totaliser, Hart®, Profibus® PA, ATEX
IP65 (aluminium housing)
IP67 (stainless steel housing)
Explosion protection: BVS 03 ATEX H/B 112


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361 KB
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II 1G Ex ia IIC T6...T1 Ga
II 2G Ex ia IIC T6...T1 Gb

3,8 MB
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II 1G Ex ia IIC T6...T1 Ga
II 2 G Ex ia IIC T6...T1 Gb

3,0 MB
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II 2G Ex ia IIC T6...T1 Gb

812 KB
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II 1G Ex ia IIC T6...T1 Ga
II 2G Ex ia IIC T6...T1 Gb

1,1 MB
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II 1D Ex iaD 20 T...°C

1,3 MB
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Ignition Hazard Assessment

87 KB
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IECEx BVS 16.0072

Ex ia IIC T6 Gb

514 KB


The fluid flows from bottom to top through the meter tube of the flowmeter. The float is lifted until an annular gap between the meter ring and the cone-shaped float is produced which corresponds to the flow. The forces acting on the float are in equilibrium. The forces that are mainly acting on the float comprise buoyancy according to the principle of Archimedes, the flow force of the medium and the weight force. Each position of the float corresponds to a flow value measured during calibration, which is transferred to a scale. The BGN variable area flowmeter consists of a meter tube with connections, a meter ring, and a conical float. By means of a magnet, the position of the float is transferred to an encapsulated follow magnet, which has been fitted to a pointer axle. The position of a second annular follow magnet fitted on the pointer axle is transferred to the scale by means of the pointer.

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