Ectaco SENCOR SDN 450 Bedienungsanleitung PDF herunterladen (Seite 3)

EGE-Elektronik Spezial-Sensoren GmbH • http://www.ege-elektronik.com

E11011 1.03

Function

The function of the flow controller is based on the thermo-

dynamic principle.

The sensor is heated internally a few degrees °C compared

to the medium into which it projects. When the medium

flows, the heat generated in the sensor is conducted away

by the medium, i. e. the sensor cools down. The tempera-

ture within the sensor is measured and compared to the

temperature of the medium. The state of flow can be derived

for each medium by the temperature difference attained.

Function of thermodynamic flow controllers

On the basis of this functional principle EGE manufactures

flow monitors for liquid and gaseous media.

Areas of application for flow monitors

Thermodynamic flow monitors function without any mov-

ing parts, therefore they are not subject to failure due to

corroded bearings, torn impellers or deflector deformation.

This reliability is highly valued in many industries. Today,

flow monitors are used both in liquids and in air, and are

employed even in explosive environments.

Monitoring of cooling

– The cooling water on welding machinery is monitored

using compact stainless steel devices. This ensures suf-

ficient cooling even for rapid cycles, otherwise the weld-

ing robot will be switched off.

– The cooling lubricant flow is monitored continuously in

processing centres. The tools are protected and have a

greater service life.

– In metal processing, e.g. rolling mills and wire drawing

machines, the rolls and coils will be cooled continually.

This is monitored by thermodynamic sensors. Due to the

rough environmental conditions the sensors are designed

for up to 160 °C and settings are made away from the

heat with special amplifiers.

Monitoring of flow medium

– The run-dry protection of pumps is a frequent applica-

tion, which often uses compact sensors with time delay.

– In dosing technology the aggregate, usually small flow

quantities, is measured exactly by means of inline sen-

sors. These sensors are inserted like a pipe into the line.

– Monitoring of filters and sieves can be ensured by medi-

um flow control; if the flow is progressively reduced, the

filter must be renewed. Where this is not carried out, the

pump is switched off in a second stage should the medi-

um flow drop further. This uses a sensor with two

switching points.

Run-dry protection of a feed pump

Sensors for explosive hazard environments

– The monitoring of cleaning processes using aggressive

media at times is often only possible with special materi-

als, e.g. hastelloy or tantalum.

– Extraction systems for hazardous vapours at laboratory

workstations as well as the hall ventilation in the hexane

processing industry are monitored using airflow sensors.

– CIP/SIP processes can be monitored and documented

with flow monitors.

Flow

No Flow

Flow Sensors

Technique and application

1 2 3 4 5 6 7 8 ... 83 84

Kommentare zu diesen Handbüchern

Keine Kommentare

Ectaco SENCOR SDN 450 Bedienungsanleitung Seite 3

Kommentare zu diesen Handbüchern