H7531 - Ethernet Temperature, Humidity and Pressure Alarm with LCD and Digital IO - External Sensor

H7531 - Ethernet Temperature, Humidity and Pressure Alarm with LCD and Digital IO - External Sensor
H7531 - Ethernet Temperature, Humidity and Pressure Alarm with LCD and Digital IO - External SensorH7531 - Ethernet Temperature, Humidity and Pressure Alarm with LCD and Digital IO - External SensorH7531 - Ethernet Temperature, Humidity and Pressure Alarm with LCD and Digital IO - External Sensor
Our Price:  £442.00(£530.40 Inc. VAT)
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Digital Inputs:  3
Digital Outputs:  2
Temperature Inputs:  1
Humidity Inputs:  1
Pressure:  1



Special order, 5-10 day despatch

A low-cost Ethernet solution for Temperature, humidity and barometric pressure monitoring and alarm in server room, data centre, museum, medical and industrial environment monitoring applications. Featuring a wide input temperature range, 3 digital inputs, 2 alarm relay outputs, LCD for local display, email and SNMP under/over temperature/humidity alarm, a built-in webserver for real time temperature/humidity 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 atmospheric pressure alarm unit
  • External 1m sensor with 
    • -30 to +80°C temperature range
    • 0-100% Relative Humidity range
    • 600 to 1100hPa pressure range
  • Accepts up to 3 contact closure inputs - Fire, flood and PIR sensors available
  • Has 2 x Relay alarm outputs rated 50V, 2A, 60VA
  • 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
  • 600 sample memory history - can export to Excel file
  • 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
  • Requires 9 - 30 Vdc 250mA PSU (not supplied)
  • Dimensions: 135 x 136 x 45 mm (W x H x D)
The H series devices are designed for measurement of temperature in °C or °F, humidity and barometric pressure. 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
  • output relay activation

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.

Any alarm input can be assigned to a relay output. 

Web Interface

The H series has a built-in web server showing current temperature 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 Web Page >>

Alarm Reporting


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.


FREE LabVIEW examples using Modbus - For viewing of actual values and graphs following examples of application were created in LabVIEW 8.5


Digital Inputs

A range of digital alarm detectors for connection to the H series digital inputs is available;

  • PIR Detector - alarm on motion detection
  • Fire/ Smoke Detector - alarm when smoke, heat or both are detected
  • Flood Detector - alarm when an area becomes flooded with water



User Manual >>

TSensor Configuration Software >>

SensorReader - Datalogger Software >>

SNMP MIB Tables >>



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