P8552 - Ethernet Temperature/Humidity Alarm Unit with Digital Alarm Inputs

P8552 - Ethernet Temperature/Humidity Alarm Unit with Digital Alarm Inputs
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Our Price:  £129.00(£154.80 Inc. VAT)
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Digital Inputs:  2
Temperature Inputs:  2
Humidity Inputs:  2


1 in stock, immediate despatch  

1 in stock, immediate despatch

A low-cost Ethernet solution for temperature and humidity monitoring and alarm in server room, data centre, museum, medical and industrial environment monitoring applications. Featuring upto 2 x temperature/history and 3 contact closure inputs, email and SNMP under/over alarm, a built-in webserver for real time temperature display and history chart and MODBUS protocol for SCADA compatibility

Special Offer:  Discounts of 7%, 10%, 12.5% and 15% are available when you order 10, 25, 50 and 100 items or more of this product.

  • Ethernet based temperature, humidity and digital input alarm unit
  • Up to 2 x DTSL temperature sensors or 2 x DSRH temperature/humidity probes
  • Temperature: -55 to +100°C with 0.1°C resolution (external probes required)
  • Humidity: 0-100% RH (external probe required)
  • 2 x Digital Inputs, either dry-contact or voltage (logic high > 2.5V, 30V max)
  • High and low alarm limits
  • email or SNMP alarm notification
  • supports up to 3 email addresses
  • Web browser interface showing real time temperature and history chart
  • 1000 sample memory history - can export to Excel file
  • 100 sample digital input events log
  • History record rate from 10 s to 18 h
  • Modbus TCP protocol for communication with SCADA software such as DAQFactory and LabVIEW
  • Standard RJ45 ethernet connector
  • 5V Main PSU (optional)
  • Dimensions: 88 x 126 x 39,5 mm (W x H x D)
The P8552 is designed for measurement of temperature, humidity and monitoring of 2 digital inputs. It is possible to read values from PC through the Ethernet connection. The following formats are supported:
  • www pages with user-design possibility
  • Modbus protocol
  • SNMPv1 protocol
  • SOAP
The instrument may send a warning message to several defined points if the measured value gets out of adjusted limits. There are the following possible ways to deliver the warning report:
  • to send an e-mail to maximum of three e-mail addresses
  • to send a SNMP trap to maximum of three IP addresses
  • to display an alarm state on the device www page
  • to send a message to Syslog server
Alarm limits may be set via the supplied TSensor program, Modbus or Telnet protocols. The alarm state may be read via the device www pages, Modbus or the SNMPv1 protocol. If channel isn’t wired, it is possible to turn off measured channel.

The P8552 has a built-in web server showing current values, alarm limits alarm state and recorded history in both tabular and chart formats. It can be viewed by any web browser. Measured value is in graph displayed by green colour, error or not yet measured values are displayed as grey broken line. Upper (lower) alarm value is in graph displayed as red (blue) line. If all values are over upper (lower) limit, the alarm line will be in the bottom (top) graph part displayed. It is possible export history to CSV file (comma or dot decimal separator) for import to Excel.

Example Pages >>


When temperature alarm limits are exceeded, an e-mail message is sent to addresses defined by the user (maximum three addresses). Maximum length of an e-mail address is 55 characters.


By means of the SNMPv1 protocol it is possible to find currently measured values and parameters concerning alarms. In case of alarm activation, warning message (a trap) can be sent to specified addresses. By means of the SNMPv1 protocol it is also possible to display history of last 600 measured values.


The device contains support for the Modbus protocol to communicate with control systems. The protocol runs in the RTU mode.


Comet Database

Complex solution for data acquisition and analysing. Easy to use and high flexible Database software for Comet Web Sensors and Regulators.

T-Sensor software

Free configuration utility for Comet Transmitters and Regulators.

SensorReader software

Basic data acquisition utility for Comet Transmitters and Regulators. Software is free for download.


Quick Start guide >>

User Manual >>

TSensor - free configuration program version >>

SensorReader - free program for data recording from one sensor >>

SNMP MIB Tables >>

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