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induSENSOR, EDS
4.4.4
Load Resistor, Maximum Operating Temperature
The sensors are connected according to the pin assignment shown, see
et seq. (all series). Notice the
different criterias:
- R
L max
= (U
B
- 10 V) / 20 mA
- R
L min
= 82.5 * 1/V * U
B
- 1625 Ohm
- T
max
= 150 °C - 3.3 °C/V * U
B
+ 0.04 °C/W * R
L
The maximum load resistor R
L
is limited by the operating voltage U
B
.
(U - 10 V)
20 mA
B
R
=
L max
A small load resistor loads the sensor electronics more thermical. With a maximum operating temperature of
85 °C (+185 °F) the minimum load resistor R
L
permitted is calculated as:
R = - 1625 Ohm
L min
82.5 * U
V
B
(If the result is negative: R
L
= 0 Ω)
With a preset load resistor the maximum operating temperature permitted is calculated as:
T = 150 °C - +
0.04 * R
L
max
3.3 * U
V
B
Ohm
;
and T
max
≤ 85 °C
R
L
=
Load resistor
U
B
=
Operating voltage
T
max
=
Maximum operating temperature