can be used for measure volume flow of liquid or air, example air flow measuring, water flow test, diesel oil flow meter.

Rotameter Flow Meter, Rotameter, Rotary Gas, Liquid Flowmeter

Functional
The series LZ flow meter consists essentially of three basic parts:

The metering tube
The tapered float
The indicator.
The flow rate determines the position of the float, the meter float is in dynamic balance, when the difference between the weight of the float and the weight of the displaced fluid equals the upward pressure resulting from the fluid velocity through the meter. The annular area between the tapered float and the tube increases until the upward and downward forces are in dynamic balance.
Since the position of the float in the metering tube can not be seen, an indicator is required, this indicator employs a magnetic coupling where a magnet follows the position of the float. The float encase an AlNiCo-transmitting magnet with two follower magnets arranged in parallel on the indicator shaft.

Special features
Rugged all-metal design
Easy stocking of parts thanks to modular concept
Complete interchangeability of all components and assemblies
Linear display
Adjustable to any fluid through replaceable cam plate
Shot-stroke design/parts do not project beyond the flanges, no matter what position the float is in
Electrical or pneumatic remote data transmission system
Limit switches can be installed
Thechnical data
Metering range(100% values) water (20º C) 6~15000 l/h
Air (0.1013MPa 20º C) 0.05~4000 m3/h
Range ability 10: 1
Accuracy class 1.5 (Special version 1.0)
Operating data
Max pressure DN15~DN50 PN4.0MPa (Special version 25MPa)
DN80~DN100 PN1.6MPa (Special version 16MPa)
Temperature of fluid -80º C~+220º C
Ambient temperature Max 120º C(Max. 60º C if signal output is electrical)
Viscosity of fluid DN15: ≤ 5mPa. S(H15.1~H15.3)
≤ 30mPa. S(H15.4~H15.9)
DN25: ≤ 250mPa. S
DN50~DN150: ≤ 300mPa. S

Connection Standard: Flange to DIN2501 or ANSI
Special Other standards on request
Electric M20× 1.5, PG11, 1/2″NPT
Overall height 250mm
Protection category to DIN 40050 IP65
Explosion Proof ExiaIICT3~6
ExdIIBT4