A Simple Solution for Large-Scale Temperature and Humidity Monitoring

The X-406™ is a fully-featured, web-enabled temperature and humidity module with four, independent 1-Wire Buses.

Each 1-Wire Bus supports up to 16 sensors, for a total of up to 64 sensors.

No software required, no programming necessary, and no subscription to buy.

Important Features

Reliable Wired Solution

Simple. Reliable. Five-Year Warranty.


Custom Email/Text Alerts


Record Temperature/Humidity History


Monitor Temperature and Humidity from the Web

Applications – Industrial Internet of Things (IIoT)

The X-406 is ideal for applications which require many 1-Wire sensors or isolation between sensors. For example:

Server Room Monitoring

The X-406 is a very useful tool for monitoring server temperatures.

Connect up to 64 Sensors

The X-406 features four 1-Wire Buses, making it optimal for monitoring the temperature of multiple servers. Each 1-Wire Bus can support up to 16 sensors for monitoring a total of up to 64 different server temperatures.

Peer to Peer Communication

Link the X-406 to other ControlByWeb products for additional monitoring and control.

Logging/Email Alerts

Enable logging to keep a real-time record of server temperatures over time. The X-406 can be configured to send custom email/text alerts if the sensor goes out of range.

X-406 monitoring temperatures for multiple servers


  • Four independent 1-Wire Buses
  • Connect up to 16 sensors per 1-Wire bus for monitoring up to 64 sensors (temperature, humidity, etc.)
  • Monitor, log, and control 32 remote modules, or up to 100 I/O
  • User Permissions: Admin, Manager, User
  • Tasks
    • 50 Scheduled
    • 50 Conditional
    • 20 Override Schedules
  • Send email alerts based on user-defined conditions (supports encrypted email servers, such as Gmail)
  • Real-Time Clock with NTP server synchronization
  • Automatic daylight savings and leap year adjustment
  • No software required
  • Customizable web-based Control Page
  • BASIC script support for advanced flexibility
  • Configurable logging
  • Graphing (logged data)
  • HTTPS/TLS encrypted
  • Static or DHCP IP address configuration
  • Modbus, SNMP, Remote Service, IP Filtering
  • Field updatable
  • Removable 14-Terminal connector for easy installation
  • Rugged DIN-Rail/wall-mountable enclosure
CE listed RoHS compliant Made in the USA

X-406 Part Numbers (Differences highlighted in green)

X-406-I Temp: Up to 64 sensors. Task builder, email daily log file, add 100 I/O on up to 32 Remote I/O Modules 9-28 VDC
X-406-E Temp: Up to 64 sensors Task builder, email daily log file, add 100 I/O on up to 32 Remote I/O Modules 9-28 VDC

Power Requirements

  • Voltage:
    • X-406-I: 9-28 VDC
    • X-406-E: 9-28 VDC
  • Max Current: 134mA

Temperature Sensors

  • Maximum Number of Sensors: 64
  • Type: Digital 1-Wire (Maxim Semiconductor DS18B20)
  • Temperature Range: -67°F to 257°F (-55°C to +125°C)
  • Accuracy: ±0.5°C (from -10°C to +85°C)
  • Sensor Functions: Monitor Temperature, Log Temperature, Email Alerts, SNMP Traps
  • Humidity Type: Xytronix Model X-DTHS-P sensor
  • Humidity Range: 0-100% RH
  • Accuracy: ±2%
  • Max Cable Length: 600 feet (180m) maximum combined cable length

Real-Time Clock:

  • Manual or NTP(Network Time Protocol) setup
  • NTP Sync Period: Once, Daily, Weekly, On Powerup
  • Auto Daylight Savings Adjustment
  • Battery (capacitor) Power Backup

Capacitor Power Backup

  • Backup Functions: Retain Real-Time Clock, 1 Register, 2 Counters, 4 Relay States
  • Backup Duration: 2 week minimum


  • Type: 10/100 Base-T Ethernet Port
  • Setup: Static or DHCP IP address configuration


  • Power and 1-Wire Bus: 14-Position, 3.81mm terminal spacing, Removable. For 16-28 AWG wire.
  • Network: 8-pin RJ-45

LED Indicators

  • Number of LEDs: 3
    • Power on
    • Network linked
    • Network activity


  • Operating Temperature: -40°F to 150°F (-40°C to 65.5°C)
  • Size:
    • 1.41in (35.7mm) wide
    • 3.88in (98.5mm) tall
    • 3.1in (78mm) deep (not including connector)
  • Weight: 5 oz (142 grams)
  • Enclosure Material: Lexan 940 Polycarbonate Plastic
  • Enclosure Flame Rating: UL94 V0




    • Log File Size: 3,072-Kbyte (up to 50,688 logs)
    • Storage: Nonvolatile Flash
    • Buffer Architecture: Circular Buffer

Log data can be periodically stored on a computer via FTP or email.

Advanced Features

  • Task Builder
  • BASIC interpreter (up to 4-Kbytes script file size)
  • Remote services

Password Settings

  • Password Length: 6-18 Characters

Electromagnetic Compliance

  • IEC CISPR 22, CISPR 24
  • EU EN55024, EN55022
  • X-406-I: FCC 47CFR15 (Class B)
  • X-406-E: FCC 47CFR15 (Class A)

Product Safety Compliance

  • UL 61010-1 (Electrical Equipment for Measurement, Control, and Laboratory Use)
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