

X-300™ | Advanced Web-Enabled Temperature Monitoring & Thermostat
The X-300 by ControlByWeb is a powerful web thermostat, temperature logger, and temperature alarm that can be monitored and controlled over an IP network.
Overview
The X-300™ is two products in one package:
Temperature Logging
First, the X-300™ is a powerful web-based temperature logging instrument that allows you to monitor and control temperatures via an IP network. Up to 8 temperature sensors can be connected at a time.
Temperatures can be viewed in real-time using a web browser. In addition, the X-300™ has many advanced features including email alerts, relay control, a BASIC interpreter, and much more.
Web-Enabled Thermostat
Second, the X-300™ is a 7-day programmable web-enabled thermostat. Users can adjust and set temperatures for heating and cooling systems and view current indoor and outdoor temperatures from any web browser.
As a web thermostat, it provides an attractive control web page that works great on desktop computers as well as smartphones such as the iPhone® and other mobile digital devices.

Thermostat control web page shown on iPhone®. (iPhone® not included.)
Setup is simple; There is no app to download, no subscription to buy, no software required, and no programming necessary for setup or use.
Applications
The X-300 is versatile and has many applications. A few examples are listed below.
The X-300's powerful and flexible design make imagination its only limit.
- Environmental Temperature Monitoring
- Refrigeration Systems
- Vacant Living/Working Spaces
Features
- Web-browser based - no software required
- Email alerts
- Three, independently controlled 3A relays
- Field updatable
- Built-In real-time clock w/ capacitor backup
- Temperature Logger
- Supports HTTP, TCP, SNMP, Modbus/TCP
- Supports additional data logging and management from web services
- Internal temperature and voltage monitoring for diagnostics
- Wide operating temperature range
- Removable terminal connector for convenient wiring
- Compact, DIN-Rail mountable enclosure
- Measurement Range: -67°F to 257°F (-55°C to +125°C)
- The temperature logger can receive data from up to 8 temperature sensors
- Supports BASIC scripts for advanced configuration
- Attractive thermostat user interface
- Connect up to 3 sensors
- 7 day programming schedule
- Connect to single stage heating/cooling system
Web-Enabled Temperature Logger:
Web-Enabled Thermostat:



Examples
Temp Monitoring/Logging
Standard configuration for monitoring and/or logging temperatures.

Temp Monitoring with Alarm
Basic configuration for an alarm. When the temperature crosses a specific threshold, the alarm will be turned on or off. The alarm could be an audio device such as a buzzer or bell, an indicator such as a lamp, or a functional device such as a fan or heater.

Web Thermostat
Basic connection to a single stage heating/cooling system.

X-300 Part Numbers (Differences highlighted in green)
PART NUMBER | OUTPUTS | INPUTS | POWER SUPPLY |
---|---|---|---|
X-300-I+PS12-A | Relays: 3 (3A 28VAC, 24VDC) | Temp: 8 (One temp sensor included) | 9-28VDC (One power supply included) |
X-300-I | Relays: 3 (3A 28VAC, 24VDC) | Temp: 8 (One temp sensor included) | 9-28VDC |
X-300-E (Discontinued) | Relays: 3 (3A 28VAC, 24VDC) | Temp: 8 (One temp sensor included) | POE Class 1 (0.44 to 3.84 Watt) or 5V±5% |
More Information:
SpecificationsWhere to Buy
Click "Buy Online" to view part numbers and pricing. X-300 is available in the USA and internationally, and can be purchased either from us or an Authorized Distributor.