Advertisement
The instrumentation consists of a 3
-inch speedometer with an integrated message
3
8
center, a 3
-inch tachometer, several 2-inch gauges, a Select/Reset switch, and a
3
8
remotely mounted Interface Module. Figure 1-1 shows how a typical system with
four 2-inch gauges might look, along with an Interface Module.
In conventional instrumentation, each electrical gauge is connected to a sensor by a
signal wire and a return wire. Additional wires for illumination, power, ground and
warning lights could total as many as six wires per gauge. Thus, a panel with 10
gauges plus a speedometer and a tachometer could require up to 60 separate wires.
By comparison, the Model 387 Instrument System uses a single 5-wire cable to con-
nect all the gauges together. This significantly reduces the number of wires behind
the instrument panel and makes the system much easier to troubleshoot and service.
The instrumentation is easy to repair. The 2-inch gauges can be disconnected, remov-
ed from the panel, disassembled, reassembled, and reinstalled without tools, and
they are maintenance-free.
With the exception of the scaleplate, all 2-inch gauges are identical. Each scaleplate is
coded and when installed in the gauge, configures the gauge to the function shown
on the scaleplate. This reduces the spare parts inventory by requiring only a few
blank gauges and a supply of inexpensive scaleplates rather than a complete spare
gauge of each type.
The instrumentation can also display warning messages and audible alarms, and has
built-in diagnostic capabilities to help diagnose problems.
Advertisement
