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A recorder, also called a datalogger, is an electronic device used to read input values from measuring devices to record and monitor them. They can be a model dedicated to this operation, or it can be a secondary function included with a sophisticated process controller. 

Variables are measured by suitable sensors and converted to signals acceptable to the recorder. The recorder provides numerical or graphical display of the measured values. The data is recorded and stored based on the schedule required for the application. Most recorders can accept multiple inputs from various sources at the same time. Many also include optional auxiliary functions for alarms, retransmission, communications, math functions, logic, batch processing, etc.  

For example, in a large industrial central chiller system: 

• Gems RFA Type -  flow sensor measures flow and sends 0-10 VDC signal for 0.1-1.0 GPM.  
• Gems 3100 Series - pressure transducer sends 4-20 mA signal for 0-200 PSIG.
• Gems CAP-300 Series - capacitive level sensor sends 12 VDC output via open collector when reservoir tank level is full.  
• West 4100 Plus Series - temperature controller sends 4-20 mA signal for 10° - 65° Fahrenheit. 

PMA KS98-2 touchscreen multi-function controller operating as a paperless recorder. Four channels simultaneous datalogging using 3 linear inputs to record flow, pressure, and temperature, with digital input to record tank-full level event. Numerical and graphical display of all channels are available on customizable screens, with manual or automatic trigger recording choices. All data is available for manual or automatic export to review as needed. 

• Alarm Outputs 
• Process Control 
• Retransmission 
• Communications 
• Transmitter Power Supply 
• Digital I/O 
• Real Time Clock 
• Math functions 
• And much more...