Type VES Calorimetric flow monitors Compact version with integrated switching transmitter 0 .1...1707 l/min DN 15...150

Calorimetric flow monitor – Compact design with integrated switching transmitter

Type VES

• Wear-free measurement: No moving parts in the flow area

• Sensitive flow detection: Switching point can be set even at very low flow rates

• High pressure resistance: Suitable for demanding industrial applications

• Flexible application options: Can be used in pipes with different nominal diameters

Description

The VE series of calorimetric flow monitors from SIKA are used for reliable monitoring of volume flows in liquids. They are used in numerous industrial applications where reliable flow control is required.

Typical areas of application include:

• Dry-running protection for pumps

• Monitoring of lubrication circuits

• Inspection of cooling and heating systems

• Detection of leaks in piping systems

The flow monitor is screwed directly into the pipe via a connection thread and can therefore be easily integrated into existing systems. The measuring probe is available in two different lengths, making the sensor suitable for pipes with different nominal diameters and wall thicknesses.

In the compact VES version, the flow sensor and the associated evaluation electronics are integrated in a common housing. This allows the flow to be monitored directly at the measuring point.

Measuring principle

The flow monitor operates according to the calorimetric measurement method, which evaluates a temperature difference. The cylindrical measuring probe contains two temperature sensors with optimal thermal contact to the medium, while at the same time being thermally insulated from each other.

One of the sensors is heated at a constant power level, while the second sensor measures the current temperature of the medium. When the medium is at rest, a constant temperature difference develops between the two sensors.

As soon as flow occurs, the heated sensor is cooled by the flowing medium. The resulting change in temperature difference depends on the flow velocity and serves as the basis for monitoring the set minimum flow rate.

Signal processing and adjustment

The measured signal is evaluated in the integrated electronics and forwarded to a comparator. This then controls a transistor output signal, which can be used for further processing in control or monitoring systems.

The desired flow limit value can be set using a potentiometer. If the flow falls below the set minimum flow rate, the sensor activates the output signal.

A 6-digit LED display also shows how close the current flow rate is to the set switching point, making it easier to adjust and monitor during operation.