Wika T32.xS Manual do Utilizador descarregar pdf (Página 11)

WIKA safety manual temperature transmitter T32.xS

11583631.02 11/2010 GB/D/F/E

2.6 Accuracy of the safe measuring function

The following information on the Total Safety Accuracy contains the following components:

■

Basic accuracy (measuring deviation from input and output, and the linearity error

of the transmitter)

■

In addition, for thermocouples, the internal cold-junction compensation (CJC),

except for type B thermocouples

■

Inuence of the ambient temperature in the range -50 ... +85 °C

The dened value for the Total Safety Accuracy for this instrument depends on the

chosen sensor type, and the congured measuring span (see following table).

Up to the minimum spans given in the table, the Total Safety Accuracy is 2 % of the

measuring range with respect to the current output signal of 16 mA.

Otherwise, the absolute values given directly in the table are valid.

CAUTION!

The measuring span is the dierence between the full scale value and the

initial value of a measuring range.

Sensor

type

Permissible

sensor range

for the accuracy

specications

Min. span for

2 % total safety

accuracy

Absolute total

safety accuracy for

small measuring

spans

Pt100 -200 ... +850 °C 84 K

2 K

JPt100 -200 ... +500 °C 50 K

Ni100 -60 ... +250 °C 21 K

Pt1000

-200 ... +850 °C

69 K 2 K

Pt500 70 K 2 K

Pt25 134 K 3 K

Pt10 241 K 5 K

TC type T -150 ... +400 °C 134 K

3 K

TC typeL -150 ... +900 °C 138 K

TC type U -150 ... +600 °C 136 K

TC type E -150 ... +1000 °C 164 K

4 K

TC type J -150 ... +1200 °C 176 K

TC type K -140 ... +1200 °C 197 K

TC type N -150 ... +1300 °C 154 K

TC type R +50 … +1600 °C 255 K

6 K

TC type S +50 … +1600 °C 273 K

TC type B +500 …+1820 °C 283 K

2. Safety

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 59 60

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