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Data center environment monitoringPoseidon2-4002

Poseidon2 4002 is a system for remote monitoring of rack environmental conditions (occupies 1U).

Measures temperature, checks if the lights are on or the doors are open in the server room, and more.

Relay outputs (4x digital output) can activate fans or an additional light. Poseidon is SNMP compatible, includes a data logger, e-mail and SMS alerts.

It can be connected to the SensDesk online portal or cloud sensor systems.



Product Parameters

Product Parameters

  • Ethernet:RJ45 (10/100 BASE-T)
  • WEB: Built-in web server
  • Data logger: Data logger for more than 250.000 records
  • Sensors: 6xRJ11 – max. 16 external sensors (1-Wire / 1-Wire UNI)
  • Can measure: Humidity, voltage, current, 4-20mA, illumination, temperature (incl. Pt100, Pt1000) and many other quantities...
  • Digital inputs (DI): 12x DI for dry contacts (state detectors)
  • Supports: Door contacts, smoke detectors, 110/230V power supply detector, water leak detector, fan failure detector
  • Digital outputs (DO): 4x DO relay output (low-voltage NO/NC relay contact)
  • RS-485 support: Yes, external sensors by HW group can be connected
  • Power: 9-30V DC
  • Mechanical: Metal housing 100 x 213 x 35 [mm] – can be mounted on a wall, on a DIN rail, or as a 1U device into a 19" cabinet.
  • Operating temperature: –30°C to +85°C (-22°F to +185°F)
  • Warranty: 5 years
  • M2M communication protocols: SNMP, XML, Modbus/TCP, HWg-Push
  • Cloud support: HWg-Push protocol
  • GSM modem: An external GSM modem for sending text messages (SMS) can be connected to RS-232
  • SMS + ring upon alert: Supported
  • Text messages (SMS): Alerts can be sent as SMS (text messages) with up to 5 recipients (phone numbers). SMS can be sent through a local GSM modem or a remote HWg-SMS-GW over the network. No software is needed.
  • Support for programmers:HWg-SDK
  • Recommended online portal:SensDesk.com – free online portal

Supported software

  • HWg-Trigger: Control of other IP devices, alarm redirection to SMS
  • HWg-PDMS: Logging, export to MS Excel, reports
  • Third-party software (SCADA systems, Modbus/TCP)

Where to use

Where to use

  • Pharmaceuticals and food storage– temperature logging
  • Monitoring of storage conditions – warehouses, cooling plants, freezers, refrigerators.
Application software can create HACCP reports.

  • Remote thermostat / cabinet monitoring
  • Industrial applications
  • Monitoring at –48V telco nodes
  • Monitoring of power supply, back-up generators or UPS
  • Pharmaceuticals and food storage– temperature logging
  • Smart buildings

Usage example

Usage example

  • Server room environment monitoring
    • Temperature in a 19" cabinet and in the room
    • Remote environment monitoring (lights, power, fire protection system, ...)
    • IT monitoring of security systems (alarms, room / cabinet doors monitoring, ...)
  • Remote environmental monitoring in a cabinet or in a datacenter
    • Temperature and humidity in the datacenter (inside racks, in the A/C outlet, under the raised floor)
    • Detection of redundant power failures
    • SNMP environment monitoring system
  • Air-conditioning monitoring
    • A/C, temperature, humidity monitoring
    • Control of additional cooling in a room or in a rack
    • Alert to leaking water
  • UPS / back-up generator monitoring
  • Fuel level, diesel generator status, remote start over IP, monitoring of temperature and service contacts

  • Remote I/O control and monitoring over the Ethernet
  • Monitors a remote environment, sensor values can be fed into any SNMP system. Enables remote reading of dry contact inputs and remote control of relay outputs (to turn on HVAC, restart a server, start a diesel generator, ...).

  • Industrial applications
  • Remote monitoring of dry contacts, 4-20mA sensors or Pt-100 and Pt-1000 temperature probes.

    Data logger stores the values in the internal memory. Modbus/TCP protocol can be used for integration with SCADA systems.

  • Cooler and freezer monitoring + alarm indication
  • Measures temperature and humidity in a cooler or a freezer. When a value is out of a safe range, a relay output is activated to e.g. turn on a warning light or sound a horn. Suitable for monitoring storages of food or pharmaceuticals. We recommend the PDMS software to monitor temperature.

  • Temperature and other measurements in a cloud
  • Poseidon2 remote monitoring device can be connected to cloud systems. Contact us for details.

  • Surveillance systems
  • Sensor readings and detector states can be fed to IP camera systems of various brands. Digital Outputs can be used to turn on the lights in a certain zone or open/close gates.

  • Smart buildings
  • Sensor readings can be shared in several applications. Relay outputs can be controlled as remote I/O.


Poseidon2-4002 icons



Server room: environment monitoring in the room

P2-4002-app1 Server-room-environment-monitoring-in-the-room

  • When the main A/C in the server room fails (temperature in the room becomes too high), Poseidon2 4002 turns on back-up A/C and alerts the operator.
  • Poseidon2 logs every opening of room or rack (cabinet) doors, can also send an e-mail.
  • Many customers use e-mail alerts and detection of light turned on in a room to detect the arrival of an operator.
  • Remote environment monitoring (humidity, power status, smoke detection, battery state measurement).
  • Water leak detection with a 2D water leak detector (WLD) on the server room floor. Leaking water can be detected with the sensing cable at multiple places and detection zones.
  • Humidity and temperature sensor monitors the dew point and operational conditions of supplementary air-conditioning.
  • Smoke detector is powered directly from the power-out output of Poseidon2 4002, no additional power adapter is necessary.
  • Server room status can be checked remotely in a smartphone app (available for Android and iPhone).
  • Server room alarm monitoring can also take place over the web or e-mail.
  • For remote monitoring of several datacenters, you can use the SensDesk.com online portal and monitor your devices with SensDesk mobile (mobile app for Android and iPhone).

Rack (cabinet): Remote environment monitoring

P2-4002-app2 Rack-cabinet-Remote-environment-monitoring

  • Poseidon2 4002 monitors the rack environmental conditions:
    • Temperature too high at the air inlet/outlet
    • Front/rear door opening
    • Light turned on in the server room
    • UPS status (power outages)
    • Smoke detector
    • Temperature at critical points (disk arrays, servers)
  • Relay outputs of Poseidon2 4002 can control:
    • Remote server restart
    • Fans
    • Light tower / cabinet indicators
    • Rack door lock
  • Temperature sensors can be placed outside the rack and measure e.g. the room temperature or the temperature in another rack.
  • To evaluate alarm situations and send alerts, we recommend the HWg-Trigger app for Windows.
  • Poseidon logs the values to its internal memory. The log can be displayed and processed e.g. in the HWg-PDMS utility for Windows.
  • Remote environment monitoring in a datacenter over SNMP
  • Can be connected to BMS (Building Management System) or SCADA (Modbus/TCP).

SMS alerts: One SIM card for all your devices

P2-4002-app3 SMS-alerts Just-a-single-SIM-card-for-all-your-devices

  • Poseidon2 4002 with a GSM modem can work as a SMS gateway for all your other HW group monitoring devices in the same LAN.
  • Poseidon2 4002 with a GSM modem is a "SMS Gateway" for other devices – just as the dedicated “HWg-SMS-GW” product. Poseidon2 4002 offers somewhat lower throughput in terms of SMS per minute.
  • Works entirely at the hardware level – as long as the LAN works, text message alerts will be sent.
  • "Power OUT" terminals at the Poseidon unit can be used to power the GSM modem.

Multiple rack monitoring: 6 racks (12 sensors) monitored by a single Poseidon2 4002


  • Poseidon2 4002 is located in one of the racks, where it also monitors the door with a door contact.
  • The other five racks are equipped with a temperature and humidity sensor.
  • Sensors are daisy-chained. Several sensors can be connected to a single active RJ11 port on the Poseidon2 4002.
  • CAT5 cabling can be used to connect sensors in external racks.
  • Temperature/humidity sensor can be also placed in the room, or at an air-conditioning outlet.


Comparation of Poseidons

  Poseidon2 3266 Poseidon2 3268 Poseidon2 3468 Poseidon2 4002
Digital Inputs (DI) 4 DI 4 DI 4 DI 12 DI
Digital Outputs (DO)   2 DO (relay) 2 DO (relay 110/230V) 4 DO (relay)
1-Wire sensors 8 sensors 8 sensors 8 sensors 16 sensors
1-Wire UNI sensors ano ano ano ano
Industrial sensors - - - 24 sensors
Power 9-30V 9-30V 9-30V / -48V 9-30V
Logger capacity 250.000 records 250.000 records 250.000 records 250.000 records
HTML, XML, Flash setup ano ano ano ano
Modbus/TCP ano ano ano ano
SNMP, SNMP Traps ano ano ano ano
SMTP Email ano ano ano ano
Local SMS Alarms - - - ano
HWg-SMS-GW client ano ano ano ano
www.SensDesk.com ano ano ano ano
HWg-SDK for programmers ano ano ano ano

Contact us

Vrážská 1418
153 00, Prague 5
Czech republic


Phone: (+420) 723 069 809
Fax: (+420) 773 553 054
E-mail: sales@st-hw.com 



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