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About Sensor Transmitters
Sensor transmitters are measurement or signal conditioning packages that provide standard, calibrated outputs from sensors or transducers. Outputs types include current loops, variable voltage levels, frequency or pulse signals, timers or counters, relays, and variable resistance outputs. Sensor transmitters can also provide radio frequency (RF) signals and transistor-transistor logic (TTL) outputs. Current loops such as 4 – 20 mA are suitable for sending signals over long distances. Typically, a current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise and impedance. Variable voltage outputs are simple, usually linear functions of the measurement. Frequency or modulated frequency outputs for sensor transmitters include amplitude modulation (AM), frequency modulation (FM), sine waves, and pulse trains.
Sensor transmitters can receive three types of inputs: signal inputs, sensor inputs, and inputs from special devices. Signal inputs include DC voltage, DC current, AC voltage, and AC current. They also include frequency and charge, signals that often require filtering and amplification. Sensor transmitters receive sensor inputs from accelerometers, thermocouples, thermistors, and resistance temperature detectors (RTD). They also receive inputs from strain gauges, many of which use a Wheatstone bridge, and from both linear and rotary variable differential transformers (LVDT and RVDT). Inputs from special devices include signals from encoders and signal per cycle counts from counters and tachometers. Timers, clocks, relays, and switches can also provided special inputs to sensor transmitters.
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Engineering Web: Sensor Transmitters
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AST Sensors - Pressure Sensor, Transmitter, and Transducer... American Sensor Technologies, Inc. (AST) offers state-of-the-art MEMS based pressure sensors, transducers, and transmitters with the best See American Sensor Technologies, Inc. - AST Profile & Catalog |
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Sensors, Sensor Conditioning, 4-20mA... |
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EETimes.com - Companies test prototype wireless-sensor nets Companies test prototype wireless-sensor nets See EE Times Information |
Part Numbers for Sensor Transmitters
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| E4B-RS70E4 5M | Digi-Key | Omron Electronics Inc-IA Div | Sensors, Transducers | ULTRASONIC SENSOR |
| PCUA30M30-AV | Digi-Key | Honeywell Sensing and Control | Sensors, Transducers | ULTRASONIC SENSOR 30"" 0-5V |
| E4B-LS70E4 5M | Digi-Key | Omron Electronics Inc-IA Div | Sensors, Transducers | ULTRASONIC SENSOR |
| E4E2-TS50C1 2M | Digi-Key | Omron Electronics Inc-IA Div | Sensors, Transducers | ULTRASONIC SENSOR |
| E4E2-TS50C2 2M | Digi-Key | Omron Electronics Inc-IA Div | Sensors, Transducers | ULTRASONIC SENSOR |
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