Tank level is commonly measured with pressure, hydrostatic, ultrasonic, or other level transmitters that provide a 4–20 mA output. By connecting the transmitter to a Microedge current-input data logger, the level can be recorded continuously, converted into engineering units, and monitored locally or remotely.This Application Note shows a typical system for monitoring tank level using a 4–20 mA transmitter. 1. Application Consider a storage tank where the liquid level must be monitored continuously.Instead of checking the tank manually, a 4–20 mA level transmitter measures the liquid level and sends the signal to a data logger.A typical system consists of:Level Transmitter → 4–20 mA → Data Logger → PC / Network → Monitoring SoftwareThe system can provide:Continuous level recordingReal-time level displayHistorical graphsEngineering-unit conversionRemote monitoringAlarm monitoring when used with supported software and system configurations 2. Typical Measurement System A common two-wire 4–20 mA transmitter requires an external DC power supply.A typical loop is:24 VDC Power Supply (+)
→ 4–20 mA Level Transmitter
→ Microedge Current Input
→ 24 VDC Power Supply (−)The transmitter cont...
