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P-line Web Sensor with PoE for measuring temperature, and relative humidity, with flood detector and binary inputs for two-state signals.

Web Sensors P8653 is designed to measure temperature or relative humidity from up to two external probes. This allows to measure values from two different places by one device.

The device is equipped with three binary inputs. P8653 has a dedicated first binary input for connection of flood detector LD-81 (included).
Other two binary inputs can be used to connect dry contacts or binary sensors with voltage output.
Communication with the device is realized via the Ethernet network. P8653 can be powered from an external power supply adapter or by using power over Ethernet – PoE.
Processing and analysis of measured data:

online in COMET Cloud
COMET Database software
integration into 3-party systems

3 years
In stock
on request
Technical data

Measured value
Relative humidity
Two-state signal
Measuring range -55 to +105 °C
Accuracy according to the connected probe DSxx
Resolution 0.1 °C
Measuring range according to the connected probe DSxx
Accuracy according to the connected probe DSxx
Resolution 0.1% RH
Usage Intended for indoor usage only
Cable length 2.5 meters (can`t be extended)
Two wire connection red wire – active, black wire – GND, directly powered from P8653
Parameters of the voltage contact Voltage input level for „L“:< 1,0 V;
Voltage input level for „H“:> 2,5 V;
Internal resistivity of the voltage source < 2kOhm
Input voltage range 0 to +30 V
Parameters of the voltage-free contact Voltage on the unclosed contact 3,3 V
Current through closed contact 0,1 mA
Maximum resistivity of the contact < 5kOhm


Operating temperature -20 to +60 °C
Channels 1x external temperature probe nebo 1x connectable temperature+humidity probe
Output Ethernet
Measuring interval 2 s
Available temperature units degrees Celsius, degrees Fahrenheit
Communication protocol WWW, Modbus TCP, SNMPv1, SOAP, XML
Alarm protocols E-mail, SNMP Trap, Syslog
Power Power over Ethernet according to IEEE 802.3af or 5Vdc
Protection class IP30
Dimensions 88 x 74 x 39,5 mm
Weight approx. 125 g
Warranty 3 years

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