Ma Multiple Loops; Alarm Output Al; Figure 5-6: Principle Circuit Diagram: Infrared Sensor With Multiple Loads; Figure 5-7: Exemplary Wiring The Alarm Output Al For The 2-Wire Sensor - Fluke Thermalert 4.0 User Manual

Installation
5
Model 2-Wire

5.4.4 mA Multiple Loops

The following figure is an example of a multiple loop system. Two loops are operated from a single power supply.
An arrangement of this type is suitable for measuring temperatures at two or more stations with an independent
readout for each station. The advantage is the economy of a single power supply for all loops.
An important consideration in this system is the current capacity of the power supply. For example, if both loops
are measuring full-scale temperature, the total supply current is calculated as follows:
�� = �� + �� = 20���� + 20���� = 40����
�������� ��������1 ��������2

Figure 5-6: Principle Circuit Diagram: Infrared Sensor with Multiple Loads

Controllers
Infrared Sensors Indicators
I
Loop1
I
Loop2
Power Supply
I
Loop

5.4.5 Alarm Output AL

The maximum current carrying capacity for the alarm output is 150 mA. Use the circuit diagram below. The alarm
output AL of the instrument is not electrically isolated from the power supply.

Figure 5-7: Exemplary Wiring the Alarm Output AL for the 2-Wire Sensor

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