Depending on the flowrate, the float will assume a certain vertical position in the tube. The float position is transmitted by a magnetic coupling system to the scale. The flowmeter is designed for installation in a vertical pipe run with flow from bottom to top. The rugged construction of the H 250 variable-area flowmeter makes it particularly suitable for difficult application and environmental conditions. The H 250 flowmeter can be equipped with either the M9 or the M10 indicator.

In the M9 indicator, the rotational movement of the follower magnet system is transmitted to the indicator without being linearized and the flowrate value is indicated directly on the scale.
 

Special features
Measuring section

Resistant to extreme chemical, mechanical and thermal loads
Measuring section of rugged all-metal construction
All components replaceable
Tapered measuring tube
All weld seams accessible for X-ray examination
Bunched bar magnets in the float ensure interference-free data transmission
Ceramic float damper, can also be retrofitted
Heating jacket available for the measuring section 

H 250 / ceramic
Suitable for most acids and alkalis
Excellent long-term stability
All wetted parts made of ceramics or PTFE

M9 indicator
Direct flow indication
Indirectly mounted indicator (HT version) for use in conjunction with high process temperatures
Electrical signal output (ESK II) with HART® Communication (can be retrofitted)
One or two limit switches (K) adjustable on the scale (can be retrofitted)
Flow totalizer ESK-Z in conjunction with the ESK II current output (can be retrofitted)
Multipole ring magnet with eddy-current brake 
 

ESK electrical current output
Float position sensed by magnetic sensors
Non-interacting and hysteresis-free conversion of the flow value into a scaled current output (4-20 mA)
Linearization of the current output via electronic memory module

 

Modular, all-metal flowmeter for liquid and gas measurement in all sectors of industry A module rack in the M9 indicator accommodates all electrical components and also the scale plate. The modules of the ESK II, ESK-Z, K1 or K2 electrical options and the scale plate are simply plugged into the module rack. The modules can be replaced or retrofitted without interrupting the process.

Various materials and different liners are available for the measuring section.
Should process temperatures exceed the max. allowable temperatures
for the standard version, the indicator can be subsequently fitted with an adapter to suit the new operating conditions.
The flowmeter can be initially equipped or retrofitted with magnetic filters and/or a float damper.

Electromagnetic compatibility (EMC)
Type: H 250/M9/ESK II
conforms with the requirements of Directive 89/336/EEC and the following European Standards:
EN 61326-1+A1+A2
and also the requirements of the NAMUR Recommendation NE 21/98.

"Ex" version
The H 250 variable-area flowmeter with M9 and M7 indicators is certified for use in hazardous areas by the Physikalisch-Technische Bundesanstalt in versions EEx ia IIC T6…T3 and EEx ib IIC T6…T3.
H 250/M9: PTB No.: PTB01 ATEX2181

Electrical signal output ESK
Electrical signal output ESK for ESK II for the M9 indicator can be built into the indicator sections.
This supplies a load-independent current of 4 to 20 mA in two-wire connection that is proportional to the instantaneous flowrate.
With an intrinsically safe feed unit, the transmitter may also be used in hazardous areas.
Conversion of the ESK II to other products or measuring ranges can be carried out by using a HART® communicator.

Flow totalizer ESK-Z
The ESK-Z totalizer in conjunction with the ESK electrical current output can be installed in the indicator section M9. A 6-digit LED display indicates the total flow value and is switch-selectable to the current % flow value.
Data save: counts are saved in the event of a power failure.
Power supply. 16 to 30 V DC, powered by 3-wire circuit.
(Suitable for non-hazardous areas).

Magnetic filter
Should the fluid contain ferromagnetic particles, a magnetic filter must be installed upstream of the flowmeter. The filter contains bar magnets in helical arrangement for optimum efficiency at minimal pressure losses. All magnets are coated with PTFE as protection against corrosion.

Two types are available:

Type F
Flange adapter, for all meter sizes overall length 100 mm (3.94")  material 1.4571 (316 Ti) and others

Type FS
Adapter without flange for all meter sizes, overall length 50 mm (1.97") material 1.4571 (316 Ti) and others

Damping device (also available as retrofit kit)
For unstable flows or low operating (inlet) pressures, particularly with gaseous products, the measuring section can be fitted with a float damping device.
This device is self-locating, and its working parts are made of high-tech ceramics to ensure a long service life.
 

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