Theory of Operation

The TS103 interfaces directly to liquid level tilt sensors that utilise an electrolytic element to form a basic potentiometer. The sensor tilt angle is indicated by the potential difference across the sensor element when a voltage is applied to the ends of the potentiometer. As the tilt sensor element is an electrolytic sensor it requires an AC signal to be applied for excitation otherwise the sensor can become degraded by polarisation effects. The TS103 excitation signal is applied by using an AC square wave signal with amplitude of 3.3 Volts with duration of 600 microseconds positive and 600 microseconds negative. The output voltage is recorded at both positive and negative excitations. Signal processing is undertaken by the on-board microprocessor to determine the tilt angle.


Example

Setup the TS103 to operate on 914.65 MHz in Normal Mode (1 Acquisition / min) with Tilt 1 and temperature sensor values transmitted to the receiver unit.

Note. When operating on the 869 MHz band only 2 individual frequencies are available. The choice of 434 or 869 MHz operation is made at the time of order and is factory set..

Figure 6 shows the DIP switch settings needed to setup the TS103.modules.

1. Set DIP 1 to On and DIP 2 - 7 to Off

The DIP switches above set the Frequency of operation. In this example to
914.65 MHz.

2. Press button S2 and hold for approximately 2 seconds until. The LED’s will flash as soon as the button S2 is selected and then go out. The frequency of operation is now set.

3. Set DIP 8 to Off - Normal Mode Selected.

The TS103 detects the mode of operation automatically. Adjusting the position of DIP 8 at any time will be detected and the mode selection activated. Figure 7 shows the DIP switch settings for the TS103 running in Normal mode.

New configuration parameters can be assigned at any time by simply adjusting the position of DIP 8.

4. To select the sensor data to be transmitted.

Set DIP 1 and DIP 3 to On, DIP 2,DIP 4-6 to Off.

Press button S2 and hold for approximately 2 seconds and hold until the LED’s go out. The sensor data to be transmitted is now selected.

Figure 8 the DIP switch settings used to select Tilt 1 and temperature readings for data transmission.

Figure 8

Figures 6 and 7 show the DIP switch settings for assigning the frequency of operation.

Mounting Instructions

Use 2.5 mm mounting screws to fasten the TS103 into the tilt meter bars.

Ensure that no stress due incorrectly installed mounting screws is applied to the TS103 PCB in order to ensure reliable operation.