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Copyright © 2011 Maretron, LLP All Rights Reserved P/N: M001808 Rev.1.1 1/11
Installation Instructions
VS-07.0HG Vacuum Switch
Introduction
The Maretron VS-07.0HG is a accessory for the SIM100 Switch Indicator Module/ The VS-07.0HG has a set of
normally open contacts that will close whenever a vacuum in excess of 7.0” Hg (3.4 PSI or 0.237 bar) is detected.
The VS-07.0HG has a factory installed 8KΩ end of line resistor so that the SIM100 can detect and report any
break in the connecting wires.
Instructions
Please follow these instructions to connect the VS-07.0HG to the NMEA 2000 network via a Maretron SIM100
Switch Indicator Module. The wiring diagram appears in Figure 1 on the reverse side of this page. The diagram
shows a connection to channel #1, but connections to other channels are similar.
1. Install two wires using the screws on the alarm contacts terminals from the VS-07.0HG to a free switch
channel on the SIM100. To keep the end of line resistor in place, please do not remove the screws. The
example in Figure 1 shows the VS-07.0HG 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
“End of Line Resistor” setting. For this example, you would set “Channel #1 Mode” to “End of Line
Resistor”.
3. Supply Power to the NMEA 2000 network, Verify that the switch channel indicates an “off” (normal) state
using Maretron N2KView software, N2KAnalyzer, or other product capable of displaying switch indicator
state.
4. Testing the vacuum switch can be accomplished using a hand vacuum pump. Supply minimum of 10” Hg
vacuum to the VS-07.0HG and verify that the switch channel indicates an “on” state.
5. Disconnect either of the two VS-07.0HG switch wires from the SIM100 and verify that the switch channel
indicates an “error” state.
6. Reconnect the alarm wires to the SIM100 and verify that the switch channel indicates an “off” (normal)
state.
7. Install the supplied rubber boot over the vacuum switch.
WARNING: The VS-07.0HG is shipped with an 8KΩ end-of-line resistor installed between the
alarm contacts terminals. Do not remove this resistor as it is required for proper operation.
Suitability of application is responsibility of the user. Extreme heat and vibration should be avoided
at mounting points such as on top of an engine over a hot manifold (MAX operation temp
250°F/121°C).
Always install by using a wrench on the hex base. Torquing at any other part of the switch voids
the warranty or may cause malfunction. A Polyimide film diaphragm is used in the pressure
switch and is not recommended for use with water. Compatibility with the brass or steel
external pressure switch material is the responsibility of the user. Contact Maretron whenever use
of switch or fluid compatibility is questioned.
PERSONAL INJURY
DO NOT USE this product as a safety or emergency stop device, or in any other application where failure of
the product could result in personal injury. Failure to comply with these instructions could result in death
or serious injury.
(continued on reverse)