Flowserve NRS1-8 Manuel d'utilisateur télécharger pdf (Page 14)

Wiring

NRS 1-8

Cable required for wiring to the electrode: four-core screened cable, e. g. I-Y(St)Y 2 x 2 x 0.8 or

LIYCY 4 x 0.5².

Max. cable length 100 m with a conductivity from 10 μS/cm.

Max. cable length 30 m with a conductivity from 0.5 μS/cm.

Max. cable length 15 m with a conductivity from 0.5 μS/cm when used in conjunction with inverter

URN 1 (24 V d. c.)

Tools

Screwdriver for slotted screws, size 2.5, completely insulated according to VDE 0680-1.

Voltage table

Use this voltage table as reference when checking the level electrode for malfunction or submersion.

Take the wiring diagram (see Fig. 10, Fig. 11) into account.

Attention

To protect the switching contacts provide the circuit with a 2.5 A slow-blow fuse or

according to TRD regulations (1.0 A for 72 hrs operation).

The screen must not make any other electrical contact.

Note

The self-checking routine of the ampliﬁer NRS 1-8 reduces U

1-2

every 40 sec.

down to 0 volt.

Connect screen only to terminal 8 of the temperature switch.

The sensitivity is indicated on the name plate.

The rated voltage is indicated on the name plate.

When switching off inductive loads, voltage spikes are produced that may impair the

operation of control and measuring systems. Inductive loads should therefore be

provided with commercial arc suppressor RC combinations, e. g. 0.1 μF/100 Ω.

1-2

2 V

eff

C=0.3 cm

-1

10 µS/cm

0.5 µS/cm

1-2

10 V

eff

C=0.13 cm

-1

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

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Flowserve NRS1-8 Manuel d'utilisateur Page 14