Ht-instruments HT950N Bedienungsanleitung PDF herunterladen (Seite 10)

HT950N

EN - 10

5.2.2. Temperature probes

WARNING

 Input circuits (2U, 2V, 2W, 1F) operates with small signals therefore its

necessary to execute a separated wiring from relay command output circuits,

supply circuit and from other power circuit.

 We always recommended to connect of each Pt100 to use a shielded

cable with shield connected from meter front only. Connect at S terminal

(31) the shield of each thermoresistance, like shown on Fig. 3.

 Resistance of each Pt100 connection cable must be 5 max and each of

three conductors must have the same resistance. I value is over 5 is

possible to have a reading error at display. You can refer at the following

Table 1 to obtain correct measurements.

Lenght Pt100 conductor from transformer connector to HT950N meter

Twisted conductor Single conductor

0.5 mm

…… about 100 m

0.75 mm

…. about 150 m

Diameter 1.0 mm…..about 150 m

Diameter 1.2 mm…..about 250 m

Diameter 1.6 mm…..about 400 m

Table 1: conductors section on HT950N connection

5.2.3. CONTR output circuit

The output circuit CONTR can be used to connect a forced ventilation system or a parallel

device installation. The electrical scheme of connection is presented on following Fig. 6.

Fig. 6: CONTR relay on no alarm condition (normally disabled)

CONTR relay operate a commutation in the following cases:

 When HT950N measures a temperature over UA threshold CONTR is activated.

 When HT950N measures a temperature under UF threshold CONTR is disabled.

CONTR relay can be more important for operators on solution of various installations

problems.

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Ht-instruments HT950N Bedienungsanleitung Seite 10