Juergensen Marine

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The Juergensen Marine Heads Up Display!

(CONTINUED)

The wiring diagram for the HUD shows the configuration with three Oxygen Sensors. Were you to use only one sensor, you would then route the single Positive (+) lead from the Oxygen Sensor to all three Sensor Ports (S1, S2 and S3 respectively).

OPERATION

The HUD utilizes a pattern of flashes, Red, Green and Orange (a combination of the Red and Green side of the LED flashing at once). Since the HUD is designed for the use of three Oxygen Sensors, it is important to note that a complete sequence of flashing is comprised of a series of three patterns.

The pattern of flashing is a function of the fraction of a ppO2 for each sensor read.

To wit: The LED will flash Orange (both Red and Green at the same time) for a ppO2 of 1.0. For every POINT above 1.0 (i.e. 1.1, 1.2, 1.3, etc.) the GREEN LED will flash once. For every POINT BELOW 1.0, the RED LED will flash once.

For example:

If the gas mixture in your loop has a ppO2 of 1.2, your HUD will flash two greens THREE TIMES (remember, it is responding to all three sensors). It will look to your eye like this:

Green green - slight pause - Green green - slight pause - Green green - longer pause, then a repeat of the same pattern.

Conversely, if the gas mixture in your loop had a ppO2 of .8 (two points below 1.0), your HUD will flash two reds THREE TIMES. It will look like this:

Red red - slight pause - Red red - slight pause - Red red

Here is the complete ÒcodeÓ for the LED signals:

NOW I NEED TO KNOW HOW TO CALIBRATE IT AND MAINTAIN IT!

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