WIKA TR21 series Betriebsanleitung Seite 11

3. Commissioning, operation
Thermometer with direct sensor output with Pt100 (model TR21-x-xPx) and
■
Pt1000 (model TR21-x-xRx)
Parameters
Terminals
Voltage U
i
Current l
i
Power P
i
Effective internal capacitance C
Effective internal inductance L
Maximum self-heating at the
sensor or thermowell tip
3.5 Overview of the temperature zones
Model TR21-A
■
with transmitter
WIKA additional information model TR21 (Ex i)
Hazardous gas
atmosphere
1 - 4
DC 30 V
550 mA
1,500 mW
negligible
i
negligible
i
(R
th
without transmitter
T : -40 ... +85 °C
a
T : -40 ... +100 °C
a
T : -40 ... +150 °C
a
T : -30 ... +250 °C
Process
) = 335 K/W
T : -50 ... +85 °C
a
T : -50 ... +100 °C
a
T : -50 ... +150 °C
a
T : -30 ... +250 °C
Process
Hazardous dust
atmosphere
1 - 4
DC 30 V
250 mA
750/650/550 mW
negligible
negligible
(R ) = 335 K/W
th
EN
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