The RO120 series of humidity and temperature transmitters comprises a versatile family of humidity probes and electronic modules renowned for their high accuracy in measuring various parameters. They are ideally suited for environmental chambers, HVAC, compressed air, furnace, and other industrial applications. In addition to percent relative humidity (%RH), these probes also offer measurement capabilities for temperature and pressure. They feature electrical analog and digital outputs not only for these measured parameters but also for microprocessor-computed parameters like parts-per-million by volume (ppmv), parts-per-million by weight (ppmw), grains of water per pound of dry gas (gr/lb), among others.

Designed for ease of installation and operation, the RO120 system incorporates field-replaceable sensor modules with standardized outputs, facilitating interchangeability without recalibration. It operates on a common unregulated DC power supply and offers user-available electrical outputs including linear analog voltage (or optional current), a digital bidirectional serial port, and alarm relays. Mounting options include wall mount, remote mount, and duct mount configurations, with additional choices such as high-temperature and high-pressure probes. Furthermore, a remote or local display unit (Type DIS) is available, featuring a two-line LCD display, alarm relays, and three 4 to 20 mA electrical outputs.