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Poseidon 3468: IP Thermostat with 230V relays

Product replaced by a new generation Poseidon2 3468.

Web enabled thermostat with temperature/humidity measurement, four dry contact inputs and two 110/230V relay outputs. Industrial version, supports SNMP and E-mail, DIN rail mount.

Poseidon 3468 alerts the operator to critical situations (contact opened/closed, or temperature/humidity out of safe range).

In case of an alarm, Poseidon sends an e-mail and connects to your NMS (Network Management System) with a SNMP trap.

Configuration and current sensor readings are accessible through a graphical WWW interface.

  • IP thermostat function to control outputs locally

  • 2 outputs rated at 250V / 16A (double-throw relay contacts)

  • Connect up to 4 temperature or humidity sensors and 4 Dry Contact inputs

  • When a contact is closed, e-mails or SNMP traps are sent to multiple recipients

IP termostat poseidon 3468

photo 1   photo 2

Poseidon2 3468 comparison to previous generation

  Poseidon2 3468
Poseidon 3468
Housing Plastic DIN rail Plastic DIN rail
Power input 9–30V Jack + Terminal block Jack + Terminal block
Power input -48VDC (electrically isolated)
Power output 12V
For powering a smoke detector or other external devices with relay outputs
RJ11 connectors for connecting external sensors 2 2
External sensors (data points) that can be connected
Combined temperature + humidity sensor counts as 2 sensors.
8 5
Supported sensors All RJ11 sensors from HW group
1-Wire UNI
Temperature, Humidity
DI (Digital Inputs for Dry Contacts) 4 4
DO (Digital Outputs – 110/230V / 16A relay) 2 2
Ethernet 100 Mbps 10 Mbps
Internal logger 250.000 records
SMS-GW client
For sending SMS alerts through a HWg-SMS-GW device without any software application
E-mail recipients 5 4
E-mail alert to values out of a defined SafeRange
Sending e-mail using SMTP TLS (e.g. gmail)
Periodic e-mail reports
E-mail alarm reminder
HWg-Push protocol (required for
SNMP protocol
Modbus/TCP protocol
Operating temperature range –30 to +70°C (–22 to 158 °F) 0 to 65°C (32 to 149 °F)

Basis features

  • Ethernet: RJ45 (10BASE-T)
  • WEB: Embedded WEB server / GUI
  • Sensors: 2xRJ11 1-Wire (max 4 temperature / humidity sensors)
  • Inputs: 4 dry contact inputs (for detectors)
    (Smoke, power, water leak, door contact, air flow, entry to the room)
  • Outputs: 2 output relays (250V AC / 16A)
    (Air conditioning, server power supply, horn / light tower)
  • M2M protocols: SNMP, XML
  • Sending SMS: With external software only
  • Physical features: dimensions: 102 x 76 x 36 [mm]
  • Response to thresholds: SNMP trap, E-mail
  • Built-in functions: Output controlled with an input or sensor value ("Thermostat" mode).
  • Support for programmers: HWg SDK
  • Supported software
    • HWg-PD Trigger: Controls other IP devices, redirects alarms to SMS
    • HWg-PDMS: Logging, export to MS Excel, reports
    • >> Third-party SNMP software
      (HP OpenView, IBM Tivoli, Nagios, Zabbix, Cacti, Monitor one, The Dude, Paessler IPCheck, Ipswitch WhatsUp, Axence nVision, CBR little:eye, LoriotPro, GFi NSM, SNMPc 7, CA NSM, ActiveXperts NM, Intellipool NM, MSC Operations Manager 2007)

>> Poseidon model XXXX - overview of models



  • Remote rack monitoring
    Door open, temperature / humidity, power outage, states of contacts, equipment restart

  • UPS / back-up generator monitoring
    Fuel level, diesel generator status, remote start over IP, monitoring of temperature and service contacts

  • Air conditioning control over IP
    Turns on heating / cooling when specified temperatures are sensed

  • IP-based security systems

    • Surveillance systems (external sensors)
    • Equipment status, access control systems
  • Operation logging: storages, coolers and freezers (food and pharmaceutical industry)

  • Monitoring systems: Information booths, ATMs, terminals


Temperature, humidity, voltage, AC current, air flow, flood, electricity supply, water leak detector, door contact, air flow, entry to the room1-Wire sensors

  • Total bus length max 60 m
  • Each sensor has its own SafeRange. When the range is exceeded (alarm), e-mail or SNMP trap is invoked.

DI (Dry contact inputs) for detectors:

DO (Digital Outputs) Relay:

  • Power Detector / Control 110/230V AC: PowerEgg 

>> Other sensors


IP thermostat = output control

Each relay output can be controlled either by a local condition, or manually:

  • Over WWW by the user
  • M2M XML protocol
  • M2M SNMP protocol

The local condition mode works as a thermostat or hygrostat over IP. The output can be tied to any connected sensor, including dry contact inputs. The control is affected by sensor hysteresis.

Which software to use

    HWg-PDMS: rack mount temperature monitoring system
  • Configuration: UDP Config  - IP address configuration
  • Event processing: PD Trigger - reacts to events
  • Monitoring and logging: HWg-PDMS - Monitoring software with MS Excel reporting
  • Simple Visualization: SNMPcap - I/O and sensors
  • Visualization: CapTemp - Process monitoring and control
  • Other applications: Third-party SNMP software
  • For programmers: HWg-SDK contains interface descriptions and examples of using M2M protocols in several programming languages
    (JAVA, PHP, Borland C++ Builder 6.0, Microsoft Visual C++ 6.0, Borland Delphi 6.0, Microsoft Visual Basic & Excel VBA, VB.NET, C code for Linux, JavaScript (AJAX) Microsoft Visual C# 2005 (.NET))


PD Trigger application example

With the PD Trigger application for Windows, it is possible to receive alarms (SNMP traps) from an unlimited number of Poseidon products and define conditions and actions based on the originating device and the probe name. For example:
  • In case of air conditioning failure in server room A, send a SMS to Peter
  • In case of alarm in server room B, send e-mail to Tom
  • In case of electricity supply failure anywhere, send SMS to Peter and turn on a warning light at the receptionist's desk

Poseidon 4002: rack mount environment monitoring, e-mail alerting, sms alerts

>> Software for the Poseidon family


    Ask for the price or details:
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    Spam protection. How many is SIX times six?

  • What is the lead time for ordered samples?
    We keep Poseidon 3468 units in stock, samples are shipped within 24 to 48 hours.
    When the order is confirmed, we inform you by e-mail about the approximate delivery date.
  • What is the warranty?
    The standard warranty for Poseidon 3468 is 5 years, can be extended upon request.
  • Where can I find the prices of your devices?
    Ask our distributors, or request a quote by (e-mail or by filling out this form).
  • How can I find out the price of Poseidons, sensors and accessories for my project?
    E-mail us (see Contacts) or use the quote request form. Specify the number of sensors, their distances, what you need to measure and how accurately. Mention the software in which you will process the data, or what do you expect from such software. Also tell us where you are from, perhaps we can recommend you an authorized installer near you.
  • Can I pay by credit card?
    Yes, but offline only. Fill out your order using our online form. When you press the button, the form is printed. Fill in your credit card information, sign the form and fax it to us.
    Another option is to pay by wire transfer.
  • How do you ship?
    We work with several shipping companies, and we use FedEx for express deliveries.

>> Online order form


Ordering numbers


OID Description
600 349
Poseidon 3468
No supply adapter, no sensors.
600 255
Poseidon 3268 Tset (photo)
Recommended quick start set with a Poseidon 3268, power supply adapter, temperature sensor (cable 3m) and door contact.
The 3268 model is fully SW compatible with 3468.


Poseidon accessories


IP thermostat, web enabled thermostat, IP relay 110V, web relay 230V
snmp relay, digital thermostat, humidity controller, ip relay, hygrometer, two thermostats

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