A device that meets all requirements

The explosion proof housing guarantees safe application in hazardous areas with non-sparking, explosion proof and dust ignition proof explosion protection – globally approved for the use in a wide range of usage zones.
Explosion proof housing
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.
Intrinsically safe electronics

Globally approved for hazardous areas

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.

Ex approvals of the flowmeter H250 M40

Special indicator variants for extreme operating conditions

Close-up image of the H250 M40 variable area flowmeter with stainless steel housing

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 rugged stainless steel housing M40 R complements the robust measuring cones to withstand the roughest conditions – both from the process and from the environment.
H250 M40 R

Robust design for harsh process conditions

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 EHEDG certified H250 F M40 for use in hygienic applications in the food industry.
Hygienic EHEDG certified design

EHEDG certification for use in the food and pharma industries

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.

As an option, it is possible to refine the measuring range span to 100:1. This way the otherwise necessary additional measuring devices for small quantities are no longer necessary.
Expanded measuring range

Expanded measuring range for more process information

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.