Example of RTD analog input deadband supervision
Temperature sensor Pt100 is used in the temperature range of 15...180 °C.
Value unit
“Degrees Celsius” is used and the set values
Value minimum
and
Value maximum
are set to 15 and 180, respectively.
Value deadband = 7500 (7.5% of the total measuring range 165)
AI_VAL# = AI_DB# = 85
If AI_VAL# changes to 90, the reporting delay is:
t s( )
( )
.=
° − ° ⋅
° − °
≈
180 15
7500
100000
90 85
2 5
C C
%s
s
C C
s
(Equation 5)
Table 55: Settings for RTD analog input deadband supervision
Funtion Setting Maximum/minimum
(=range)
RTD analog input Value deadband Value maximum / Value
minimum (=20000)
Since the function can be utilized in various measurement
modes, the default values are set to the extremes; thus,
it is very important to set correct limit values to suit
the application before the deadband supervision works
properly.
3.13.2.9 RTD temperature vs. resistance
Table 56: Temperature vs. resistance
Temp
°C
Platinum TCR 0.00385 Nickel TCR 0.00618 Copper
TCR
0.00427
Pt 100 Pt 250 Ni 100 Ni 120 Ni 250 Cu 10
-40 84.27 210.675 79.1 94.92 197.75 7.49
-30 88.22 220.55 84.1 100.92 210.25 -
-20 92.16 230.4 89.3 107.16 223.25 8.263
-10 96.09 240.225 94.6 113.52 236.5 -
0 100 250 100 120 250 9.035
10 103.9 259.75 105.6 126.72 264 -
20 107.79 269.475 111.2 133.44 278 9.807
30 111.67 279.175 117.1 140.52 292.75 -
40 115.54 288.85 123 147.6 307.5 10.58
50 119.4 298.5 129.1 154.92 322.75 -
Table continues on the next page
Basic functions 1MRS757644 H
124 620 series
Technical Manual
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