Using the purely mechanical version as a base, you can add or replace electronic modules, scaling functions to your needs. Anything is possible, from analogue flow measurement without auxiliary power to digital integration into a fieldbus system.
Just twist off the cover, insert the module until it clicks, twist the cover back on and you‘re finished – no tools, no process interruption. And it‘s just as easy to replace the measuring scale when there‘s a change in the application. It couldn‘t be easier.
H250 M40 from KROHNE offers a universal Ex-design across a wide range of usage zones and protection types.
All electronic components are designed intrinsically safe and non-sparking and can be used in areas that are explosive due to the presence of gas or dust. As an option, the same components, featuring a safety housing, can be installed as explosion proof devices. One device can thus accommodate the different regional explosion protection strategies.
H250 M40 is ATEX-, IECEx- and FM-approved for the USA and Canada and also according to NEPSI for China. In addition, the measuring device also features other local approvals such as INMETRO, CCOE/PESO, KGS and EAC/GOST-R.
Whether it‘s intrinsically safe or explosion proof – the devices are designed as IP66/IP68 or NEMA 4X/6 as standard. An IP69K version is also available on request.
With the indicator housing made of stainless steel, the H250 M40 R withstands attacks from salt fogs and contaminated precipitates. It can be reliably used in corrosive atmospheres and is perfectly suited for use in spray water zones, such as in the food and beverage industries as it features ingress protection type IP69K.
Unique to date: The indestructible stainless steel housing is also available on request in an explosion proof version for use in hazardous areas.
As a high-temperature variant, the H250 M40 HT measuring device is suitable both for very high product temperatures up to +400 °C / +752 °F as well as cryogenic applications down to -200 °C / -328 °F. The increased distance between the measuring tube and the display makes it easier to insulate the measuring tube.
The measuring principle allows for a robust, closed tube design without sensor feedthrough, as the height of the float is transferred to the indicator by way of a magnetic coupling. This enables high pressure versions that can withstand up to 900 barg / 13,000 psig.
All wetted, pressurised parts are made as standard of 1.4404/316L stainless steel and meet the requirements of the NACE MR0175 standard. To guarantee the longevity of the device even with chemically harsh products, it is possible to use special materials such as Hastelloy®, titanium, Monel®, etc. in production. In addition, the H250 C M40 is also available with a PTFE liner for applications involving aggressive acids and bases.
The H250 F M40 is the only variable area flowmeter with EHEDG approval for food and pharmaceutical applications. FDA-compliant materials meet strict hygienic and legal regulations. A design with no dead spaces or stagnation zones as well as the electro-polished surface of the wetted parts with a surface roughness Ra <0.8 μm make it difficult for deposits to settle and facilitate proper cleaning.
Depending on the technology, the standard measuring range span of the H250 M40 is 10:1. As an option, it is possible to refine the measuring range span – and this is worldwide unique for measuring devices in this category – to 100:1. This way the otherwise necessary additional measuring devices for small quantities are no longer necessary.
Typically, variable area flowmeters are installed vertically in rising pipes and the product must flow through them from bottom to top. This can lead to considerable expense.
The versions H250 H M40 and H250 U M40 offer the possibility to install the flowmeter in horizontal or even in descending pipes.
H250 H M40
For use in horizontal pipes
H250 U M40
For use in descending pipes
Thanks to a wide variety of process connections – common flange connections in accordance with DIN, ASME and JIS, male and female threads as well as clamp connections – this device is available to all sectors of industry.
User-friendliness was the top priority for KROHNE when developing the H250 M40. Following simple mechanical installation and start-up with an electrical connection if applicable, the device is immediately ready to use and it is good for long-term maintenance-free operation.
High flexibility as well as low purchase and operating costs make the H250 M40 variable area flowmeter a cost-effective all-rounder!
Today, as the world’s market leader, we cover a variety of applications with our comprehensive product portfolio of metal and glass cones.
The new standard device, explosion proof and intrinsically safe
DK32, 34, 37
With mechanical or electronic indicator and metering valve to set flow value accurately
DK46, 47, 48, 800
Small and compact dosing meters with valve
All-purpose flowmeters with various process connections
At KROHNE, the modular device design of the H250 M40 combined with a flexible production structure form the basis for application and customer specific versions.
As with every KROHNE variable area flowmeter, you can count on reliability and repeatability. Each device is individually calibrated for the respective application. And the robust metal version – available in a variety of materials – provides a high degree of resistance to pressure, temperature and medium.
Automated welding processes with radiographic inspection and surface crack detection as well as other quality assessments such as material certificates, pressure, leak and hardness testing, all under the control of a seamless quality management system, form the basis for the devices being authorised for use in areas where safety is critical such as chemical plants and nuclear power stations.