Self-Powered Through Phone Line
The OMJ Series is a family of smart transducers that send formatted data over standard phone lines. Models are available to measure temperature, pressure, 4-20 mA current loops, and also tank level. The transducer converts the raw analog or digital information obtained from its sensor to a modulated data form that is transmitted over telephone lines, via a built-in modem. A personal computer can be programmed to contact multiple OMJ Series transducers in different remote locations. The remote interrogation ability of the OMJ Series allows cost-effective centralized data acquisition for applications ranging from remote locations anywhere in the world. OMJ Series transducers include all of the required electronics as well as the sensing element. No other signal conditioning or data gathering devices are required.
OMJ Series transducers are self-powered by virtue of the phone line. There is no need for expensive power lines, backup systems, or batteries. Simply connect the unit as a normal transducer and plug in a phone line. OMJ Series transducers are FCC approved. Using the optional OMJ-SOFT data acquisition software and a PC with Windows, the information from multiple remote locations can be linked or pasted into a spreadsheet or other user-generated software. Once the information is in the PC, historical records can be generated and process control charts can be monitored. Since OMJ Series transducers communicate using a simple ASCII format, you may also connect to them with any PC running a standard communication or terminal emulation program. With the OMJ Series, it is possible to conduct state-of-the-art data acquisition at a very attractive cost per point.
To use an OMJ Series transducer, simply connect it to the point of measurement in the manner of any typical transducer and plug it into a phone line. The unit is now fully operational. No power line hassles or expensive backup systems are required. In addition to the measurement/conditioning circuitry, each unit contains a 1200 baud auto answer modem connected to an RJ-11 phone jack. Each OMJ Series transducer is temperature profiled and calibrated at the factory.
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