Afriso EURO-INDEX RG 210 Gebrauchsanweisung - Seite 7

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Probe

The control unit and the PTC thermistor probe are connected by

means of a signal cable. The tip of the probe is equipped with a PTC

thermistor. During operation, the PTC thermistor is heated and can

distinguish between gaseous and liquid media due to the different

heat dissipation.

Fig. 2: Probe type 150

3.1

Operating modes

When the mains voltage is switched on, the connected PTC thermis-

tor heats up. Three different operating modes must be distinguished.

The various operating modes are set by means of a selector on the

printed circuit board.

Operating mode "Probe 1": level switch

Only the signal received from probe 1 is processed. A second probe

may be connected, but it will not be considered.

If the PTC thermistor is exposed to air (i. e. not submerged in liquid)

once probe 1 is fully heated up, the yellow LED "Probe 1" goes out,

the green LED "Release" lights up and the output relay is energised.

If the PTC thermistor of probe 1 is submerged in liquid or if the heat-

up process of probe 1 is not yet finished or if probe 1 is not con-

nected or short-circuited, the yellow LED "Probe 1" lights up, the

green LED "Release" goes out and the output relay is de-energised.

Operating mode "Filling": level control for filling

Both PTC thermistor probes "Probe 1" and "Probe 2" must be con-

nected. The following applies to both probes in this operating mode:

If the PTC thermistor is exposed to air (not submerged in a liquid)

RG 210

Product description

Plastic screw

connector

Probe cable

Brass weight

Protective sleeve

for PTC thermis-

tor

Fig. 3: Probe type 937