Ectaco SENCOR SDN 450 Manual do Utilizador descarregar pdf (Página 4)

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1.04 E11011

Flow Sensors

Technique and application

Lateral installation Underside installation

1 = Sensor

2 = Gasket

3 = Chamber

4 = Locating

5 = Counterpart

Dimensions of the gasket

Thread D hdt

G1/4 13.2 1.519.5 1

G1/2 21 227.5 1.5

G3/4 26.5 232.5 1.5

seal thread

air

Deposits

Sensors

The probe is made of special steel in one piece, using a

robust electronic and mechanical constructions. By means

of this, absolute tightness and a high pressure resistance

is obtained. The chemical stability of the sensor material

must be verified individually for every application Assem-

bly is independent of flow direction. A basic requirement is

that the sensor tip must be completely surrounded by the

monitored medium, whether the medium flows or is at rest.

With smaller cross sections care must be taken that the

sensor tip does not narrow the pipe profile considerably.

In order to avoid function failures due to flow turbulence,

no parts which influence flow cross-section or flow direc-

tion should be installed immediately before or behind a

sensor. Recommended values for inlet and outlet are 4 to 8

times the interior pipe diameter.

Assembly

Sensors with short thread-pieces of the STK... type are

particulary suited for fitting into T-pieces. Sensor length is

designed in such a way that the sensor tip

is completely immersed in the medium

without touching the opposite side.

Sensors with long thread-pieces of the ST...

type are suitable for larger pipe diameters

or for use with longer assembly thread-

pieces.

Sensor threads are G-pipe threads to DIN

ISO 228 and also comply with the BSP

standard. A flat gasket centered by a step

on the sensor ensures a good seal. A good

seal can also be ensured using Teflon tape.

For pressure above 30 bar or very high

screw-down torques, a flat gasket may be

damaged, especially if it is made of plastic.

In this case, a recess must be incorporated

into the fitting which will keep the gasket in

the right position in the case of high loads. PTFE gaskets

must always be used with this technique. For high pres-

sure applications, metal gaskets must be used.

The standard material for gaskets is AFM 30/34. Special

gaskets made of other materials such as moving iron, cop-

per or PTFE are also available on request.

A rising pipe should be used in case of open systems or in

the presence of air pockets. Deposits and air pockets do

not impair sensor function in the case of lateral assembly,

providing the sensor is completely

immersed in the medium. Assembly

from below assures flow monitoring

function even if there are air pockets in

the pipe. However, the monitored

medium level must not fall below the

upper edge of the measuring tip.

Assembly from above is only applica-

ble if there is no air in the pipe.

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