Ectaco SENCOR SDN 450 Manual de usuario descargar pdf (Pagina 7)

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

E11011 1.07

Flow Sensors

Technique and application

High temperature

High temperature sensors are manufactured from temper-

ature-resistant components and feature FEP cables.

The functional range of these special sensors of series 400

is specified as +10...+120 °C. Temporarily 135 °C is per-

missible for max. 10 min. High temperature sensors of

series 500 can be used for media temperatures of up to

160 °C / 320 °F

EX sensors

Sensors for gas and dust explosive environments are

design approved to ATEX 100a and operated with an

approved switching device of series SZA... or SEA...

Subject to approval the use of flow monitors is possible in

areas for devices of category 1 and category 2.

Stainless steel 1.4571 (AISI 316 Ti) is used as a standard

material for all sensors. All other stainless steels such as

Hastelloy, Monel and bronzes can be provided on request.

Corrosion resistance of the materials to be used must be

specifically checked for the intended application.

Connection

Flow monitoring sensors are available with a M12 plug

connector or fixed cable. The connection cable from the

sensor to the amplifier may be up to 100 m long. For dis-

tances above 30 m a shielded cable is preferred. In all

cases the chosen wire strength must be checked against

the requirements.

Amplifiers

Terminal rail devices

The terminal rail devices SKZ... and SKM... evaluate the

signals from the sensors and provide relays or analog

outputs. Adjustment is via two potentiometers accessible

from the front. 6 LEDs indicate the flow state. The switch-

ing devices SKZ offer an additional switching delay and

temperature monitoring. When installing amplifiers it

must be ensured that the devices are not subject to heat

build-up.

EX devices

For Ex flow sensors switching devices SEA... and SZA are

available. They have their own intrinsically safe circuit to

which the sensors are connected. This circuit is electri-

cally isolated from the mains circuit and the relays or

analog output. Notes on installation:

1. All Ex-Amplifiers must be installed outside the hazar-

dous area.

2. The installation of the amplifier must at least meet pro-

tection to IP 20 EN 60529.

3. When installing the amplifier there must be a safe dis-

tance between intrinsically-safe and unsafe connec-

tions. The minimum distance is 50 mm. Alternatively

each connection can be equipped with a shrink-sleeve

or crimp connection.

LED array

All flow monitors feature an array of LEDs giving a visual

indication of the flow tendency. If the red LED illuminates,

the flow falls short of the preset limit and the switching

output is not enabled. The yellow LED indicates that the

limit has been reached and the output enabled. In addition

to the yellow LED a further 4 green LEDs may illuminate

representing a relative measure for how much the limit has

been exceeded.

Compact devices

Compact devices integrate amplifier and sensor within

one housing. This permits setting a limit value directly at

the measuring location. The cabling is thus reduced to the

less interference-prone mains supply cables and the

switching output.

Designs

Compact devices are available in an all stainless steel

design (SC 440) and a design with PBT plastic housing (SN

450 / LN 450). Types SC 440 have been proven for more

than 10 years in industrial applications and excel through

their ruggedness and small shape. The families SN 450 /

LN 450 come in a multitude of electrical designs. The

devices are available as direct and alternating current ver-

sions and fitted with switching, relays or analog output.

Special designs further incorporate limit temperature

monitoring or a shut-down time delay.

Inline compact devices

Inline compact devices SDN 500... are inserted inline into

a pipe. The measuring pipes are smooth inside and do not

have any components protruding into the flow. They are

characterised by short response times and a large detec-

tion range. Due to their small shape they can also be used

where installation room is sparse. The SDN 500... are fitted

with PNP, relays, or analog outputs. For pulsating flows

the EGE programme contains a compact device capable

of detecting very short flows of smallest amounts at the

start of the flow.

0.1

l / min

0.5 1 5 10 50 100

l / min

Sensing range

Working range

SDN 503

SDN 504

SDN 510

SDN 515

SDN 520

SDN 552

Flow ranges for EGE-Inline-Compact models

1 2 3 4 5 6 7 8 9 10 11 12 ... 83 84

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