Vaisala DRYCAP DMT143 Guide de l'utilisateur Page 15

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Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 13
Loop-Powered Display
DMT143 can be connected to a loop-powered external LED display. The
display provides a reading of the output parameter. The display is
powered by the 4 ... 20 mA current signal, so there is no need for an
external power supply.
Two models are available:
- Nokeval 301
- Nokeval 302 (with alarm relays)
The display is delivered at its default settings. Configure the display
functions and scaling according to the documentation delivered with the
display. For a wiring example, see Nokeval 301/302 Display Wiring
Diagram (document code M211634EN). For the order codes of the
displays, see section Spare Parts and Accessories on page 72.
1102-053
Figure 3 Nokeval 301 Loop-Powered Display
NOTE
The loop resistance of the display must be included in the loop resistance
calculation for the complet
e current loop. For the loop resistance of the
display, refer to the manufacturer’s documentation.
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