Ectaco SENCOR SDN 450 Manual do Utilizador descarregar pdf (Página 10)

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

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Flow Sensors

Technique and application • Inline-Digital display

Flow monitoring and measuring

The EGE-inline flow controllers with digital display monitor

flow rates in the range of 1...80 l/min and display the flow

rate digitally. They feature front panel buttons used to call

functions and modify settings. The application area

includes all areas of flow monitoring and measuring, in

which a flow display is desired.

Series SDN 552 / 554 – thermal principle

The SDN 552/554 series is based on the thermodynamic

principle, heat is created in a measuring pipe and absorbed

by the passing medium. The dissipated heat quantity is a

measurement for the flow speed. A microprocessor proc-

esses this data, calculates the flow rate quantity and dis-

plays the result in liters/minutes in a 3-digit, 7-segment

display.

Page 1.39 - 1.41

Series SDV 652 – vortex principle

The flow measurement devices Series SDV 652 are based

on the vortex principle. They are well suitable for applica-

tions, where a good linearity and larger measurement

precision is necessary. They are insensitive to quick tem-

perature changes and the reaction time of the device is

below one second. The vortex principle allows a flow

measurement without moving parts: Behind a bluff body in

the flow, vortexes are generated which are detected by

the device and yield the flow velocity.

Page 1.42

Series SDI 852 / 853 – magnetic-inductive

The new inline flow sensors SDI 852/853 offer a monitor-

ing function as well as precise flow measurements in the

range of 0...80 l / min with a measured error smaller than

2%. The flow rate is digitally depicted using a clear 3-dig-

it, 7-segment display. The magnetic-inductive measuring

system facilitates that this device i suitable for many dif-

ferent applications in the field of automating processes

and workflows. Furthermore, a high degree of measuring

accuracy is ensured.

The magnetic-inductive measuring principle requires the

electrical conductivity of the medium. Low limit values of

15 μS/cm for water or 10 μS/cm for other fluids still offer a

broad function range.

The combination of precise measuring system and small,

compact design distinguishes the series SDI from other

inline flow sensors. They are easy to install subsequently

into existing configurations or offer a space-saving alter-

native for new constructions.

Cooling and temperature control as well as metering cir-

cuits, for example in the field of water treatment, are pre-

cisely and accurately monitored. This is accomplished

with a set point function as well as an analogue linear cur-

rent output.

Page 1.43 - 1.45

Installation

The inline flow sensors are installed "in-line" into a pipe

line. The pipe may be connected directly with the com-

pression tube fitting connection or with an adaptor SDA....

Threaded bushings are located in the bottom housing

plate and are used to fasten the device to a support plate

or other similar base. A mounting plate (optional acces-

sory) may also be attached to the housing. This makes it

possible to fasten the unit from the front.

Signalfilter

The parameter for the signal filter allows inputting a value

that determines the time interval in which the measuring

signal is averaged. Inputs between 0 to 8 seconds are

possible. A low value results in a very quick response; a

high value results in a very steady display of the measured

value. The filter is switched off when the setting is 0.

Averaging has the same effect on display and outputs.

Access code

Protection against unauthorized access to the program-

ming functions provides an access code. Without this

number combination, only the currently saved values for

the switching points and further parameters can be dis-

played.

Reference adjustment

The accuracy of the displayed flow rate quantity can be

optimized with the CAL function using an exact reference

flow rate meter. Here you have the option to modify the

displayed flow rate value and adapt it to the reference

value.

Medium preselection SDN 552 / 554

Besides water, a water-glycol mixture is also often used

as a heat carrier in cooling systems. Due to the changed

thermal properties of the fluid through the incorporation of

glycol, the accuracy of the displayed flow rate value is

affected and the limit values are also changed. To correct

this effect, the devices of the SDN 552/554 type series

have a function for selecting the measurement medium.

Glycol fractions up to 30% can be entered. The micro-

processor working in the device then calculates the flow

rate quantities considering the glycol fraction.

Applications

These devices are especially suitable for flow rate moni-

toring in cooling systems due to the greater functionality,

as well as easy programming and installation.

These devices are characterized by short response times

and robust display values, even if the medium is subject

to large temperature fluctuations as to be found in welding

technology in the automotive industry.

In the display, the flow rate value, which is continuously

updated, is displayed in l/min. The person responsible for

the plant or the machine has thus constantly the informa-

tion on the available cooling performance.

Industrial climate control units are often operated with a

water-glycol mixture in the secondary cycle due to the

danger of freezing. The glycol fraction can be programmed

in the SDN menu in a couple of seconds to ensure a cor-

rect value is also displayed in the application.

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