Wika TR25 Bedienungsanleitung PDF herunterladen (Seite 23)

WIKA operating instructions model TR25 (Ex i)

14073045.01 10/2013 GB/D

As safety clearance for type-examined instruments (for T6 to T3), another 5 °C must be

subtracted from the 200 °C; hence 195 °C would be permissible. This means that in this case

temperature class T3 is not exceeded.

Additional information

Temperature class forT3 = 200 °C

Safety clearance for type-examined instruments (T6 to T3)

= 5 K

Safety clearance for type-examined instruments (T1 to T2)

= 10 K

1) EN/IEC 60079-0: 2009 Section 26.5.1

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

Measuring insert Head transmitter Power supply

: DC 30 V U

: DC 6.5 V U

: DC 30 V U

: DC 25.4 V

: 550 mA I

: 9.3 mA I

: 130 mA I

: 88.2 mA

(

max

) at the sensor: 1.5 W P

: 15.2 mW P

: 800 mW P

: 560 mW

: negligible C

: 24 µF C

: 7.8 nF C

: 93 nF

: negligible L

: 365 mH L

: 100 µH L

: 2.7 mH

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 capaci-

tance of the electrical connection leads.

10. Maintenance and cleaning

10.1 Maintenance

The resistance thermometer described here is maintenance-free.

Repairs should only be carried out by the manufacturer or, following prior consultation, by

correspondingly qualied skilled personnel.

10.2 Cleaning

CAUTION!

■

Before cleaning, correctly disconnect the instrument from the pressure supply,

switch it o and disconnect it from the mains.

■

Clean the instrument with a moist cloth.

■

Electrical connections must not come into contact with moisture.

■

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

persons and the environment from exposure to residual media.

■

Residual media in the dismounted instrument 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 “Return”.

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

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 51 52

Kommentare zu diesen Handbüchern

Keine Kommentare

Wika TR25 Bedienungsanleitung Seite 23

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Messgeräte Wika TR25