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3.6. Valve control
Red Seal provides an optional single stage solenoid valve (gure 3-4) to control the opening and closing
of the differential valve on LPG meters. The valve is opened only when the E4000 is powered and the
start button has been pressed to commence a delivery. The valve will close whenever the stop button is
pressed during a delivery or power is lost to the register.
Dual stage valves are also available for making preset deliveries of LPG. The E4000 has 2 relays which
control the two-stage shut off either by volume or monetary amount. The rst stage reduces ow by 90%
to slowly bring delivered volume up to the preset amount. The second stage shuts off ow when the preset
amount is reached without hydraulic shock to the delivery system.
Figure 3-5. Single Stage LPG Valve
Figure 3-6. Dual Stage LPG Valve
Caution: All valves supplied with the E4000 (security valves and dual-stage preset) are wired with
an in-line TVS (transient voltage suppressor) to protect the E4000 from harmful voltage spikes. If
an E4000 is installed on another manufacturer’s meter with a different solenoid valve (or a Neptune
meter using another manufacturer’s valve), an appropriate TVS must be installed. Contact custom-
er service for details.
3.7. Junction Box
The junction box, located in the vehicle cab, houses a
PC board and serves as the connection point for the
E4000 peripherals mounted in the cab. The power to
the E4000 and printer is distributed from here. Data
passes through the junction box on its way to the printer.
The RS232 data link from the E4000 to any peripheral-
computing device such as a Hand held or Laptop is
made here. The same RS232 connector is used for
downloading the E4000 conguration parameters from a
laptop using the E4000 Conguration Program.
Figure 3-7. Junction Box
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