Calorimetric flow monitor Type VES


Product description

Possible areas of application Calorimetric flow monitor Type VES

SIKA VE series calorimetric flow monitors are used to monitor flow rates with typical application areas such as:

  • Protection for pumps against dry running
  • Monitoring lubrication circuits
  • Cooling and heating circuits
  • Monitoring for leaks



Compact version
The flow monitor is easily screwed into the process pipe directly via a connection thread. As the measuring probe is available in two different lengths, a wide range of pipe sizes and wall thicknesses are covered.

At the compact version VES the flow sensor and the corresponding switching transducer form a single unit. This means that flow can be monitored directly at the point of measurement.

Function principle
The calorimetric flow monitor works on the principle of the detection of temperature differences. The cylindrical measuring probe contains two temperature sensors. These have optimum heat conducting contact with the medium and are thermally well insulated from each other. One sensor is heated with a constant electrical power while the other sensor is not heated and thus takes on the temperature of the medium. When the medium is not in motion the temperature difference between the two sensors stabilizes at a constant level.

The flowing medium cools down the heated sensor. The changing temperature difference between the two sensors depends on the velocity and is a parameter for monitoring the specified minimum flow rate. This signal is sent to a comparator which controls a transistor output signal.

With a potentiometer the output signal is set to the requested set point. When the flow rate fails to reach this limit the transistor activates the output signal. A six position LED array displays the proximity to the alarm point which has been specified.


Technical features

Technical features

Compact version
Switching transducer Integrated
Output signal PNP, open collector

Material electronic housing


Stand-by time

Ca. 2...15 s

Response time Ca. 1...13 s
Max. pressure rating 200 bar
Medium temperature -20...85 °C
Process connection G½ male
Degree of protection IP67

Material sensor

not wetted


stainless steel 1.4571
brass nickel-plated

Electrical connection 4 pin sensor plug M12 x 1 according IEC 947-5-2
Set point range (coverage water: 1...150 cm/s; oil: 3...300 cm/s)

Pipe size

DN 15
DN 20
DN 25
DN 32
DN 40
DN 50
DN 65
DN 80
DN 100
DN 150

Water [l/min]



Further details can be found in the datasheet.



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