Sensor Installation - Global Water GL400 User Manual

Chapter 2

Sensor Installation

Note, the following instructions and screenshots specifically refer to the GL400-7-1. If you have purchased
the GL400-1-1, you will only be able to utilize analog channel 1 (C1) and the pulse channel (Pulse).
You can connect 2-wire or 3-wire sensors to the
GL400. Before connecting a sensor, first discon-
nect the battery spade lugs from terminals.
battery terminals
To connect a sensor thread sensor cable through an enclosure strain relief, and attach cable wires to the
channel terminals. Before inserting wires into terminals you may need to loosen terminal screws.
For 2-wire analog sensors, insert black wire into the S (signal) terminal and tighten until secure. Next, in-
sert red wire into the + (power) terminal and tighten until secure.
For 3-wire analog sensors, insert black wire into the – (ground) terminal and tighten until secure. Next, in-
sert white wire into the S (signal) terminal and tighten until secure. Finally, insert red wire into the +
(power) terminal and tighten until secure.
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analog channels 1 – 7
red (+) terminal
pulse channel
You can connect analog sensors to chan-
nels 1 – 7 (C1 – C7) on the terminal strip
and a pulse sensor to the Pulse channel.
Note, you can connect an external power
source to the Ext. terminals, located be-
low the internal battery (Batt.) terminals.
2-wire:
terminals +/S
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black (-) terminal
3-wire:
terminals +/S/-