Service & Support

LEOMI has developed a new measuring system which enclosed the old and proven technology together with a very new and high performance digital microprocessor technology.

The calorimetric measurement based on the physically principle of heat transfer from a heated element to the ambient medium (eg. air). This is effected by the velocity, by the density (temperature and pressure) and by the characteristic of the medium.

The temperature difference (over temperature) Δt between the reference sensor (medium temperature) and the heater sensor is controlled electrical constant by an analogue controller**

(CTA= Constant Temperature Anemometer).

LEOMI uses analogue technology utilizing a separate analogue controller for over temperature controlling instead a traditional drift prone Wheatstone Bridge.

Electrical drifting, no lead length compensation, difficult adjustment and many more disadvantages of a Wheatstone Bridge are not existing in the LEOMI solutions.

Thermal mass flow meters by LEOMI are designed to utilize industrial applications such as compressed air, combustion air, bio gas, natural gas, flue gas, aeration air, flare gas, welding gas and many more corrosive process gases.

Industries include textile & steel, power & petrochemicals, automobile & ancillaries, cement & chemical, food & pharmaceuticals and many more.

Additionally, our engineers are ready to join hands with you for any other application we can possess.

Insertion thermal mass flow meters measure direct gas mass flow with short response time and absolute accuracy. It eliminates difficulties of a traditional drift prone Wheatstone Bridge technology by utilizing a separate analogue controller for the over temperature controlling. It also has large span and low pressure drop than other technologies.

If there is no meaningful pressure drop, then LEOMI meters are nearly not influencing the flow. It provides direct mass flow. So, it also eliminates temperature or pressure transmitters.

 LEOMI meters can be used in high temperature ranges up to 400°C. Wide turn down ratio range 1:100. And it can calibrate velocity from 0.6 Nm/s to 60Nm/s.

There is no maintenance required other than periodically checking of the sensor for particle deposition. The procedure condition decides the support plan. Inert, clean & dry applications need no maintenance.

As the electrical characteristics and conditions are changing over the time, it is advisable to change components on a frequent basis. It is suggested to re-calibrate the meter on time to time (yearly) basis.

The customer should use thermal mass flowmeter mainly for dry and clean gas to ensure accuracy & for the gas it is calibrated. 

• Change in gas composition may degrade its accuracy 
• Wet gas conditions also reduce accuracy and liquid droplets may cause sudden rise in flowrate which is artificial and causes inaccuracy. 
• Dust or dirt or oil particles in gas may cause drift in readings as it will dampen actual differential temperature between sensors.     

Thermal mass flowmeters are mostly successful in various gas applications such as 

• Combustion Air in power plant for realizing combustion efficiency
• Compressed air consumption & leak monitoring as main utility in textile, automobiles & other industries
• Aeration air in wastewater & effluent treatment for DO control
• Natural gas metering in-plant (boilers/heaters/furnaces) process efficiency & production cost accounting

As thermal mass flowmeter offers benefits: 

• For dry and clean gas at certain conditions with highest accuracy
• Highest turndown ratio of 100:1 or better 
• No pressure drop or negligible against other technologies saves energy in low static line pressure like Biogas, Landfill gas etc. 
• Versatile & easy installation in 30mins at very low cost. 

The customer must know it’s process requirements and selection of correct flowmeters. Customer should provide below details for best performance:

• Flow rate operating min. & max ranges
• Temperature & pressure operating min.& max ranges
• Gas composition or Gas mixture (Dry or Wet)
• Installation piping layout & available straight lengths

Generally customer oversee few points while using thermal mass flowmeter as below:

• available straight lengths are in-sufficient 
• in-correct gas mixture composition estimation & it’s conditions 

As a manufacturer we have to provide suitable recommendation of flow conditioner for in-sufficient straight length for better accuracy. On-site K-factor may be applied for some typical process condition by application study for error compensation in a limit way.

NO. As in thermal mass flowmeter heat is dispersed from heater sensors to gas stream & cooling effect of heater sensor generate change in differential temperature in most of real gases while in steam flow heater sensor has no effect of cooling which prevents change in differential temperature thus measurement not possible.

Now a day’s Ultrasonic flowmeter for gas flow measurement is under advancement and it’s Non-Intrusive working is the major advantages against Thermal mass flow technology off-course at a higher cost. Dirt or moist gas may create effect accuracy of ultrasonic flowmeter than thermal mass flowmeter. Inside pipe corrosion have much impact in performance in Ultrasonic flowmeter than thermal mass flowmeter. For fix gas flowmeters application still thermal mass flowmeter will still a preference due to its cost versus performance. Portable applications ultrasonic is much preferred.

As many companies see big potential in this technology, it has persuaded researchers on developing rugged sensor design & materials configuration and writing software algorithms on sensor behavioral simulation analysis as per actual site conditions. Also, developing suitable accessories such as cleaning mechanisms, onsite re-calibration for solving complex applications is also underway. All above and customers demand will improve this technology demand. Thermal Mass flowmeter seems to have a great future considering it’s cost versus performance against some of the conventional technologies such as Orifice, Vortex, turbine flowmeter etc. 

Insertion thermal mass flow meters offer several advantages for flue stack applications. Firstly, they provide accurate measurements of gas flow rates, helping optimize combustion processes and ensuring regulatory compliance. Secondly, they are easy to install, requiring minimal disruption to the flue stack system. Additionally, these meters are highly durable, capable of withstanding harsh operating conditions commonly found in flue stack environments.

An insertion thermal mass flow meter operates based on the principle of heat transfer. It typically consists of a heated sensor and one or more temperature sensors. The heated sensor measures the cooling effect of the gas flow, which is directly proportional to the mass flow rate. By comparing the temperature difference between the heated and non-heated sensors, the meter calculates the gas flow rate accurately.

Air Flow Meters are critical for optimizing and monitoring air consumption in various industrial processes, ensuring efficiency and reducing operational costs.

By providing accurate real-time data on gas usage, Gas Flow Meters help industries in monitoring and controlling their gas consumption, leading to improved process efficiency and cost savings.

Absolutely, Bio Gas Flow Meters are specifically designed to measure biogas production accurately, essential for optimizing the performance of renewable energy systems.

An Actual Mass Flow Meter measures the mass flow of gases or liquids directly, offering precise control in processes where exact quantities are crucial for quality and efficiency.

Inline Thermal Mass Flow Meters provide direct, in-line measurement of mass flow rates for gases, offering superior accuracy and minimal pressure drop, ideal for both monitoring and control applications.