A few years ago, we heard from a customer that they had many PTT, Potentiometer Transmitters in use at a large dam on a branch of the Colorado River. The dam is part of a system to deliver water and power via one of the largest public power utilities for consumers and businesses in the southwest..
All of the PTT units had operated flawlessly in service, even after they were sent back for refurbishment due to capacitor wear out (dry out of electrolytic) four years after the calculated 15-year lifespan.
The customer inquired of whether or not we had a site programmable potentiometer transmitter that was line powered that he could start keeping in stock and consider replacing the PTTs over time. This would alleviate the downtime he has while waiting on PTT refurbishment.
Moore Industries recommended the CPT, a PC-Programmable Temperature Transmitter and Signal Isolator/Converter, as the most economical product suited to the application at the time.
Today, we would recommend the 4-wire (universal line/mains-powered) SPA2 Temperature Alarm Trip/Transmitter with the analog output option. The SPA2 can be ordered with two or four alarms and accepts a potentiometer input of 0-4K Ohms as standard and can accept higher range inputs with externally fitted custom input resistors (contact Moore Industries for assistance). The SPA2 is push button field configurable or PC programmable and comes standard with a display. The analog output can be field configured for either voltage or current, any range between 0-10V or 0-20mA and supports reverse, split range or linear outputs. The universal power supply input (22-375VDC or 90-260VAC) and full field configurability makes the SPA2 an ideal universal transmitter to keep in stock to meet a variety of last-minute instrument needs.
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