Wika TR33 Uživatelský manuál stáhnout pdf (Strana 20)

14073818.01 01/2014 GB/D

20 WIKA operating instructions model TR33

Do not exceed the following values:

■

Version with 4 ... 20 mA output signal

Power supply and current loop circuit (connections)

Voltage U

DC 30 V

Current I

120 mA

Eective internal capacitance C

6.2 nF

Eective internal inductance L

110 µH

Sensor current loop

Power P

37.5 mW

Ambient temperature -40 ... +85 °C (-40 ... +185 °F)

The maximum self-heating at the sensor tip is 4 K

■

Version with Pt100 and Pt1000 output signal

Sensor current loop

Voltage U

DC 30 V

Current I

550 mA

Eective internal capacitance negligibly small

Eective internal inductance negligibly small

Ambient temperature -40 ... +85 °C (-40 ... +185 °F)

6.3 Behaviour of the electrical output signal

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Sensor break and short-circuit

Sensor break or short-circuit are signalled after positive detection

(after approx. 1 second). If this fault condition has been caused by

a malfunction, then a relevant measurement signal must exist for

approx. 1 second in order to return to measuring mode. From the time

of the error detection up to the fault signal, the last relevant measured

value will be delivered on the current loop.

Therefore, in the event of a “true” sensor break or short-circuit, this

is also signalled permanently. In the event of a “false” sensor break

or short-circuit, the transmitter has the possibility of reverting to

measuring mode.

6. Commissioning, operation

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