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Page Title: Figure 10-8. Typical Process Instrument Loop
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DOE-HDBK-1092-98
24V
+
+
I = 4-20mA
Signal
RL = 250 ohms
ground
Sensor
1-5V
Recorder
Figure 10-8. Typical Process Instrument Loop.
10.9.2.2.1 HAZARDS
The use of materials for something other than their original design criteria has the potential for
providing an additional hazard, especially to personnel unfamiliar with the research apparatus.
Personnel may assume that the material is used as originally designed and can unknowingly expose
themselves to hazards unless special precautions are followed.
Some examples of items used in an unconventional manner are:
1. Copper pipe used as an electrical conductor
2. Insulated flexible copper pipe used as an electrical conductor
3. Specially designed high-voltage or high-current connectors
4. Specially designed high-voltage or high-current switches
5. Water column used as a high-voltage resistor
6. Standard coax cable used in special high-voltage pulsed circuits
10-20


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