Example of a Loading Cycle with 5-Wire Sensors
Symbol (any color) below means flashing Light Emitting
Diodes. A solid circle means LED indicator are solid on
Icons and compartments can also flash.
Indications and bypass possibilities are limited when 5-wire sensors
are connected. These limitations are caused by the 5-wire sensor
principle. The sensors are connected in series and all sensors
connected after a wet sensor will be disabled, therefore bypass is not
possible with one (or more) wet sensors. The led pattern and display
of a 8870 monitor will be identical of the pattern of a monitor with 2-
wire sensor connected.
The figure at the top of this page shows a 8 compartment tank truck
with dry sensors and verified grounding.
The second figure will appear as soon as one sensor becomes wet, in
this example sensor in compartment 3.
The indicator of the wet compartment (3) will be solid on and all remaining dry sensors indicators will flash red to
emphasis the non -permit status of the monitor. Shown by the in the upper right corner. Also, the compartment
on the display will flash as well as the second sensor icon on the bottom line of the display. The state of the permit
output relay will be shown as a cross in the right upper corner of the display.
Explanation of used icons on the Display
For detailed information a display is added. OPW has chosen to use an organic display to make sure the display is
visible when dark, consumes low power, and is usable in cold environments. Icons are used to avoid any language
confusion. A list of the used icon is shown in Table 4. Where possible In the right / bottom corner a four digit
numerically code appears when an error is detected.in most cases a rear view of the socket is shown with
corresponding icon and pin number. Since there are many possible messages it’s impossible to use icons or text on
a small display to present clear and unequivocal information. A rough subdivision is shown below in Table 3 the
number before the icon is the number of the terminal and plug NOT the compartment number.
Due to the complexity and number of possible faults contact OPW or your distributor for assistance when an error
number appears.
Table 3
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