The Series 1 probe was built around an 8-bit peripheral interface controller (PIC) chip. Development of the firmware for the probe was sub-contracted to a local electronics engineer who received a royalty on each unit sold.
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To match the capabilities available in Sentek's software, new features had to be made available in the addVANTAGE program. The modular nature of the program meant this could be achieved with a new module - the C-Probe Extension.
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Although it took a few incarnations to get the probe working properly, many units are still working ten years later.