1. level indicator 2. CE,CQC,ISO9001 3. Measure, display,alarm 4. 4loops ... . Various dimensions selectable AI-501 Intelligent Digital Temperature Gas Level Indicator Suitable for measuring and displaying temperature, pressure, flow, level, humidity ... inputDual display windows, easy to set parameters and alarms points.Universal input power- 85~264VAC, or 11~26VAC/VDCAlarms can be ...