Overview:
DLCc measures CO2, humidity and temperature and transmits data to the base station. Sensing is done using internal digital sensors. The intervals for sensing and transmission are set at installation time using the PC program SensorGraph.
Sensor values are sent by the receiving base station to:
- ESTEDE® PC software SensorGraph via a serial interface or to
- ESTEDE® internet Websensys via TCP/IP or GPRS
- Or to a data logger, PLC, automation system via RS485/422
The sensor has a unique identity and a network ID. Transmitted data is encrypted thereby avoiding other sensor systems or receivers to receive the data.
Optionally the following values can be assigned to the sensor: Friendly Name, Minimum Trip Value and Maximum Trip Value. Trip values are used to signal an alarm condition to the base station when these values are exceeded.
The sensor can locally store up to 10.000 measurements in non-volatile memory. This means about 3000 for each quantity. This storage is used when a connection to the base station is not available to ensure that measurements are not lost. Whenever the sensor and base station are in range again, the data is transmitted to the base station.
The distance between sensor and base station can be up to 1000 meters in case of free line-ofsight. Characteristic in-building range values are between 50 and 80 meters.
For CO2 measurements the sensor has a self-calibration technique that is designed to be used in applications where concentrations will drop to outside ambient conditions (approximately 400 ppm) at least 3 times in a 14 days period. For applications that do not see periodic ambient conditions a yearly calibration may be necessary. Unit is calibrated 0-2000ppm. On request the unit can be calibrated for higher ppm values. Serial digital output will read to 20.000ppm.
The sensor is externally powered with 8 - 30VDC.
