Wika TR10-A Manual do Utilizador descarregar pdf (Página 35)

WIKA operating instructions RTD and TC, intrinsically safe designs (Ex i)

3345267.12 01/2014 GB/D

Simplied verication of intrinsic safety for the above-mentioned combination

Measuring insert Zener barrier Z954 Display instrument

(non-hazardous area)

: DC 30 V U

: DC 9 V U

: AC 250 V U

: AC 230 V

: 550 mA I

: 510 mA I

: nA I

: nA

(

max

) at the sensor: 1.5 W P

: 1150 mW P

: nA P

: nA

: negligible C

: 4.9 µF C

: nA C

: nA

: negligible L

: 0.12 mH L

: nA L

: nA

Upon comparing the values, it is obvious that it is permissible to connect these units to one

another. However, the operator must also take into account the values for inductance and

capacitance of the electrical connection leads.

These calculations apply to the Z954 Zener barrier in connection with a resistance thermometer

Pt100 in 3-channel mode without grounding, i.e., symmetrical operation of the resistance

thermometer in 3-wire circuit on a display or evaluation instrument.

Electrical connection

For sensor connections, terminal, cable or connector assignments, see chapter

6.1 “Electrical connection”.

10. Maintenance and cleaning

10.1 Maintenance

These thermometers are maintenance-free.

Repairs must only be carried out by the manufacturer.

10.2 Cleaning

CAUTION!

■

Clean the instrument with a moist cloth. This applies in particular to thermometers

with a housing made of plastic and cable probes with plastic-insulated connection

lead, to ensure that any risk of electrostatic discharge is avoided.

■

Electrical connections must not come into contact with moisture.

■

Wash or clean the dismounted instrument before returning it, in order to protect

sta and the environment from exposure to residual media.

■

Residual media in dismounted instruments can result in a risk to persons, the

environment and equipment. Take sucient precautionary measures.

For information on returning the instrument, see chapter 12.2 “Returns”.

9. Calculation examples for ... / 10. Maintenance and cleaning

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