MICRO-EPSILON induSENSOR EDS Series, Инструкция по эксплуатации

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Page 32 induSENSOR, EDS
4.4.4 Load Resistor, Maximum Operating Temperature
The sensors are connected according to the pin assignment shown, see Fig. 18 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