Technical Data
Electrical Specifications
9
•
NO = Normally Open
•
NC = Normally Close
•
PO = Permanently Open
•
PC = Permanently Close
Analog Output (current loop, 0/4
– 20mA)
Galvanically isolated analog output signal, to stimulate output currents (0/4 - 20 mA). The
output signal is an active output with 16 Bit resolution, to drive a maximum resistive load of
500Ω. Just the acquired object temperature, measured by either 1C or 2C devices and
displayed on on the rear Endurance operators display, is converted to a 16 Bit current
equivalent. The user has to define the temperature measurement range and must assign
the lower and upper range limits to the current equivalent (0
– 20mA / 4 – 20mA).
The following formula demonstrates the output current (I
c)
calculation regarding the given
measurement span [upper temperature(T
U
)
– lower temperature(T
L
)].
Given example values:
•
Upper meas. Temp. (T
u
): 2000°C, Lower meas. Temp.(T
L
): 1000°C
•
Choosen output current range: 4
– 20mA, I
CL
= 4mA at T
L
I
CU
= 20mA at T
U
•
Actual meas. Temp.: Tmeas = 1578°C
Ic = Icl +
Icu − Icl
Tu − Tl
∗ (Tmeas − Tl) = 4mA +
20mA − 4mA
2000°C − 1000°C
∗ (1578°C − 1000°C) = 13.248mA
RS485 Serial Communication Interface (2-wire half duplex transmission)
Galvanically isolated 2-wire RS485 communication interface:
•
Half duplex transmission with multidrop line capability
•
Network compatible up to 32 connected Endurance sensors
Relay
Relay
Endurance®
External process device
Relay control or contact input (PLC)
≤ 48 V
R
i
=
500
Ω
External process
PLC, Computer…
-mA Out
I
c
Endurance
+mA Out
0
– 20mA
4
– 20mA
Current loop out
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