Faulty Detected Sensors
LED indication when a sensor fault (or more) is (are) detected
Green indicators : all off
Red indicator : all correct detected sensors are flashing and faulty sensor(s) is (are) continuous on
If the fault is bypassed the rack monitor will revert to the state mentioned above with the faulty channels bypassed.
Note: In some cases most likely with Five-Wire sensors it is not possible to continue with overfill detection
functionality.
Sensor Detection
The 88XX Rack monitor is an auto switching rack monitor and will detect automatically the 2 types commonly used
overfill sensors. Before the rack monitor switch to permissive the following steps will be performed.
1. Individual short detection between sensors and ground.
2. Resistive ground detection via pin 9
3. Ground bolt detection via pin 9
4. Sensor type detection
5. Detected sensors complies to EN13922
6. Detected sensors complies to Rest Of the World specifications (ROW)
7. Detected sensors appears to work but not complies to the above specifications.
Note: Overfill sensors commonly used in industry are not necessarily compatible with commonly used Rack
Monitors in industry. The specification of the ROW overfill sensor are based on an extensive worldwide
sensor collection. All parameters of those sensors are collected and the boundaries are stored in a table
inside the 88XX Rack monitor.
Note: The European Standard EN13922 describes the following points.
- Functions
- Major components
- Characteristics
- Test methods
Note: in some cases, the rack monitor is still able to use the connected sensor as an overfill detection device. The
operator will be asked to accept the detected sensor by using the Blue bypass key.
Step 1
In this step the rack monitor is checking if all wires are connected to a sensor and there are no shorts between
channels. E.g. If on the tank truck one sensor is connected to two pins on the socket or one dummy channel is used
to emulate two dry sensors the Rack monitor will detect this as a short and show this on the Oled-Display.
Step 2 & 3
Although ground verification is continues it is mention in this document as a step. Since many Tank-Trucks are
equipped with a ground bolt the 88XX Rack Monitor will accept this automatically as a proper ground verification.
Be aware that conform the EN13922 in combination with Five-Wire sensor(s) the earth verification is
connected in series with the vapour recovery hose interlock switch
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