Installation Instructions
10271 1-1/2" FPT Cooling Water Flow Switch
Introduction
The Maretron 10271 is an accessory for the SIM100 Switch Indicator Module. The 10271 has a set of normally
closed contacts that will open whenever a flow of cooling water of a user-settable amount is detected.
Instructions
Please follow these instructions to connect the 10271 to the NMEA 2000 network via a Maretron SIM100 Switch
Indicator Module. The wiring diagram appears in Figure 1. The diagram shows a connection to channel #1, but
connections to other channels are similar. Please refer to the original manufacturer’s instructions packaged with
the product for additional details including setting of the switch activation flow rate.
1. Install the two wires from the 10271 to a free switch channel on the SIM100. The two wires are
interchangeable. The example in Figure 1 shows the flow switch connected to switch channel 1, terminals
SW1A and SW1B.
2. Use a Maretron DSM250 display (firmware 1.3.5 or higher), or the DSM250 Viewing function of Maretron
N2KAnalyzer software, or other Maretron display product capable of configuring the SIM100 to set the
switch channel mode (indicated as “Channel #x Mode” on the DSM250) for the appropriate channel to the
“No End of Line Resistor” setting. For this example, you would set “Channel #1 Mode” to “No End of Line
Resistor”.
3. Supply Power to the NMEA 2000 network, Verify that the switch channel indicates an “on” (normal) state
using Maretron N2KView software, N2KAnalyzer, or other product capable of displaying switch indicator
state.
4. Start cooling water flow through the 10271 and verify that the switch channel indicates an “off” state.
Flow
SIM100 Screw Terminals
Switch
1
2
3
4
5
6
7
8
9 10 11 12
Figure 1 - Wiring Diagram
Copyright © 2011 Maretron, LLP All Rights Reserved
P/N: M003017 Rev.1.1 7/11
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