Technology - Tailored to your individual needs

In each property, the conditions and metering equipment are different. Our extensive range of products and solutions for consumption measuring, meter reading and billing of costs for cooling, hot & cold water and electric is tailored to the individual needs.

Chilled Water Energy Meters

Precision and accuracy in energy metering

In times of increasing energy costs, it is important to measure and control energy consumption accurately. We meet our costumers' requirements by offering a variety of highly advanced cooling metering instruments. 

Chilled Water Energy Meters, commonly referred to as BTU meters, can be defined by the measurement of heat/chilled water energy consumption.

The BTU meter comprises of a flow measurement sensor, two temperature sensors and a microprocessor based energy calculator. The Flow Sensor shall be installed in chilled water return lines in the direction of the chilled water flow either in vertical or horizontal position. The two temperature sensors, one sensor shall be installed on return line and the second sensor shall be installed in supply line. The quantity of thermal energy transferred from the cooling water to the consumer over a defined period of time is proportional to the temperature difference between the flow and return and the volume of cooling water that has flowed through.

ista offers two types of BTU meters, one with ultrasonic measuring technology (ultrasonic BTU meters) and other with conventional multi jet impeller (mechanical BTU meters).

Ultrasonic Cooling Meter

Precise measurement of energy consumption

The cooling/heat meter generation ultego III with their different series and sizing provides a multitude of combination and application possibilities. The compact version ultego III smart plus and the modular type perfect III range consists of a calculator, flow sensor and temperature sensors. The calculators can be removed and mounted separately and the two external sensors specified at a number of lengths to meet all requirements. Both series can be provided with a number of integrated communication modules and are compliant to the European Measuring Instruments Directive MID.


  • Cooling / heating systems with water as a cooling/heat carrier
  • Transfer stations
  • Larger cooling/heating systems in apartment buildings
  • Flow range : 0.6 to 60 m3 / h

Your Benefits

  • Accurate, reliable and wear- free measurement
  • Precise detection of even the smallest flow rates
  • Insensitive to dirt and mess resistant
  • Extremely low energy consumption
  • Low pressure loss
  • Fast, intelligent temperature - measuring grid
  • Can be installed horizontally or vertically ( III ultego smart plus even upside down with removable calculator )
  • Measuring range of flow 1: 100 to EN 1434 , total 1 : 1000
  • Tamper-proof by sealing

Features of the ultego III

ultego III consists of a flow measuring section with two integrated ultrasonic sensors and an electronic calculator with bus output and a lithium battery. The battery life is 10 years plus one year reserve. Flow meters with a nominal flow rate from 3.5 to 60 m3 / h can be delivered.

Combined Heat and Cooling Meters - Sensonic II

The sensonic II has a hybrid calculator for the combined detection of heat and cold. The consumption values ​​for both heat and cooling calibration conform to regulation approved devices are shown two counter registers. The meter is available as a compact and combined version suitable for flexible use in residential and commercial properties. Using a combined sensonic II meter means that the installation of an additional refrigeration and heat meter can be omitted, reducing the equipment and installation costs.

Performance of sensonic II

Calibration-law requirements

Our sensonic II hybrid heat meters are approved in Europe under the EU Directive 2004 /22 / EC on measuring instruments. In addition, the refrigerant detection has been certified for Germany according to the guidelines of the Physikalisch -Technische Bundesanstalt ( PTB). So that the devices meet all statutory calibration requirements for precise measurement and legally compliant billing.

Different Configurations

The different types cover a wide range of requirements. The compact version with nominal flow rates of 0.6 / 1.5 and 2.5 m³ / h has been developed specifically for use in residential buildings. With an electronic multi-jet turbine , they have a high measurement stability throughout the life. The larger combined meters where the calculator, flow sensor and temperature sensor are installed separately, are at nominal flow rates up to 250 m³ / h and more suited for the commercial sector .

Switching between heating and cooling Measurement

The temperature difference between supply and return is recorded in 60 second intervals and converted to ​​an energy measurement. This also determines the automatic switching between heating and cooling measurement. The hybrid counter starts with heat detection, when the temperature difference is greater than 0 Kelvin and the flow temperature is above 20 ° C. Similarly, the device switches to cold mode as soon as the water temperature in the flow is less than the return , so there is a negative temperature difference and the flow temperature is less than 20 ° C. The amount of energy consumed is then calculated from the integrated electronic microchip (ASIC ) from the measured readings and various constants for the fluid flowing through (K - factor) and displayed on the LCD.

Water meters

Water meters - Metering water with a system

Water meters measure individual water consumption. Whether hot or cold water, in the kitchen, bathroom or cellar, in a new build or old building: we have the appropriate version for every field of application.

The M-Bus system

M-Bus system - Instantaneous control, flexible reaction

All meters connected to the symphonic M-bus system can be read centrally: either directly on the spot or by data transfer to an external central control. This improves the quality of life for your tenants, and enables you to monitor the energy balance of the building more flexible.

Your advantages

  • Connection of up to 2,000 consumption recording devices possible
  • Use of commercially available electric materials
  • Simple installation
  • M-Bus cable protected against reverse polarity
  • Various line topologies (star, tree and linear structures)
  • Benefits of central wired readout with symphonic mbus
  • Frequent and fast meter reading possible (electronic data can be directly put to other uses)
  • No problems gaining access to homes as the users do not have to be disturbed (advance notice unnecessary)
  • Avoidance of meter reading errors guarantees high reliability

Combined heat and cold meter

Ultrasonic cooling meter

Heat meters

Contact us to find out more

ista Middle East FZE - HO
Cayan Business Center
Office 204
P.O.Box 502302
United Arab Emirates

24x7 Call Center: 800 4782 63 (ista ME)