Despatch MIC1462 Controller Manual Manual do Utilizador descarregar pdf (Página 14)

Contacts - Arcing may occur across contacts when the contact opens and closes. This

results in electrical noise as well as damage to the contacts. Connecting a RC network

properly sized can eliminate this arc.

For circuits up to 3 amps, a combination of a 47 ohm resistor and 0.1 microfarad

capacitor (1000 volts) is recommended. For circuits from 3 to 5 amps, connect 2 of

these in parallel. See Figure 2-5, below.

FIGURE 2-5

2.4 Sensor Placement (Thermocouple Or RTD)

Two wire RTD's should be used only with lead lengths less than 10 feet.

If the temperature probe is to be subjected to corrosive or abrasive conditions, it should

be protected by the appropriate thermowell. The probe should be positioned to reflect

true process temperature:

• In liquid media - the most agitated area

• In air - the best circulated area

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Despatch MIC1462 Controller Manual Manual do Utilizador Página 14