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Data sheet:


  • Web-Thermo-Hygrograph

Temperatures and relative humidity to the Power-over-Ethernet network


General information

  • NEW! Encrypted e-mail sending via SSL/TLS

  • NEW! cloud Document measurement data online in the W&T Measurement Cloud

  • NEW! Device language selectable German/English
  • Monitor temperatures and curves with your browser
    • HTML page design user-variable
    • Direct access to the actual value, e.g., for integration into other Web pages

    Characteristic curves
    • Freely selectable line color
    • Freely selectable display size
    • Extreme value or current value display
    • Various scales displayed
    • Automatic or manual scaling
  • SNMP polling / alarm traps for temperature and relative humidity values for incorporating into your existing SNMP management system

  • Time synchronization via time server calibration
  • Supply voltage via Power-over-Ethernet (PoE)
    • Phantom power using data pairs
    • Power over unused wire pairs
    • Alternate external supply possible
  • Connections:
    • 10/100MBit
    • Combined temperature-humidity sensor included
  • Easy Start:
    • Connect sensor and network cable
    • Connect supply voltage
    • Assign IP number
    • That’s it!
  • Application examples:
    • Monitor temperatures in the server room, network cabinet or office
    • Send alarms when limits are exceeded via e-mail, SNMP trap, TCP client, Syslog
    • Logging of the measured values via FTP, Excel file, e-mail attachment, internal memory
    • Dewpoint measurement
    • Climate monitoring
  • Software interfaces
    • HTTP, Web browser
    • AJAX, JavaScript
    • TCP and UDP sockets, client and server
    • OPC server
    • SMTP (e-mail)
    • SNMP (including trap)
    • SYSLOG
    • FTP (data logging)
  • Green IT: Monitor efficiency of the server room climate control
  • Conforms to standards both in office and industrial environments:
    • High noise resistance for industrial environments
    • Low noise emission for residential and business areas
  • 5 year guarantee

Background information:

Like all models in the Web-IO Climate series, the Web-Thermo-Hygrograph 57620 provides everything you need for connecting a temperature and relative humidity sensor to the computer network. In addition, the supply voltage, in accordance with IEEE 802.3af (Power-over-Ethernet) can be provided over the network cable, with both phantom power over the data pairs as well as power using the wire pairs not used for 10/100BT. Problems with receptacles, country-specific plug types, different line voltages etc. are a thing of the past.

For cases in which PoE is planned but not yet fully implemented, it is also possible to provide power using an external power supply and screw terminals.

Technical data

  • Thermo-Hygro Probe:
    • I2C connection
  • Network:
  • Power supply:
    • Power-over-Ethernet (PoE) or via screw terminal with
    • DC 18V .. 48V (+/-10%) or AC 18Veff .. 30Veff (+/-10%)

  • Measuring unit
  • Measuring range:
    • -40°C...85°C, 0..100% rh
  • Resolution:
    • 1/10 °C, 1/10% rh
  • Measuring error:
    • Temperature:
    • typ. @ 25°C ±0.3°C
    • max. @ -40..85°C ±1.5°C
    • Relative humidity:
    • typ. @ -20..60°C (normal range) ±1.8%rH (10-90%rH)
    • max. @ -20..60°C (normal range) ±4%rH (0-100%rH)
    • temporary @ -40..85°C (max range) +3%rH nach 60h Operation outside normal range
    • Long-term stability typ. <0.5%rH / year
  • Measuring frequency:
    • 4s
  • Storage frequency:
    • 1, 5, 15, 60 min
  • Memory depth (832kB):
    • min. 10 weeks, max. 8 years
  • Deviation of the internal clock:
    • max. 4.32 min. / month (without time server calibration)
    • max. 3 sec. (with time server calibration)

  • Other data
  • Galvanic isolation:
    • Measurement inputs to network: min. 500 volts
  • E-mail function:
    • Mail for sending alarms or as reporting function
  • Power supply:
    • Power-over-Ethernet (PoE) or via screw terminal with
    • DC 18V .. 48V (+/-10%) or AC 18Veff .. 30Veff (+/-10%)
  • Current consumption:
    • AVG: 80mA @24VDC, 100mA @20VAC
    • Max: 90mA @24VDC, 50mA @48VDC
    • PoE Class 1 (0.44 - 3.84W)
  • Configuration interface:
    • RS232 serial port, 9600 baud, 8 data bits, 1 stop bit, no parity
  • Housing:
    • Plastic compact housing, 105x75x22mm
  • Weight:
    • approx. 200g
  • Ambient storage temperature:
    • -40..+70°C
  • Ambient operating temperature:
    • 0 .. +60°C
  • Permissible relative humidity:
    • 0..95% RH (non-condensing)
  • Scope of delivery:
    • 1x Web-Thermo-Hygrograph for rail mount
    • 1x W&T transducer, 2m (temperature and humidity)
    • 1x product CD with WuTility management tool, OPC server, programming examples for VB/Delphi, SNMP-MIB, reference manual in German/English