WebDAQ 904

Internet Enabled Universal Input Logger


The WebDAQ 904 is a stand-alone, universal data logger designed for remote monitoring and control of multiple signal types.

WebDAQ BrochureLog four simultaneous analog inputs

Support for voltage (up to ±60 V), current, RTD, thermocouples, resistance, and bridge-based sensors

Built-in web server allows access from any device with a web browser

WiFi support for wireless operation

View data in real time or post acquisition

Virtually unlimited storage

Easy, flexible task scheduling

Four isolated digital I/O for triggers and alarms

Alarming and notifications with email and SMS messaging

Ability to export .csv data for Excel® and MATLAB®

View entire WebDAQ Series

WebDAQ firmware uses open-source software components; refer to WebDAQ-Licenses for the licensing information of each component. WebDAQ open-source code is available upon request from info@mccdaq.com.

For more information on the WebDAQ Series download our WebDAQ Brochure.

Analog Input
Channels Resolution Max Sample Rate
Voltage, Current, Thermocouples, RTD,
Resistance, Bridge-based Sensors
24-bit 100 S/s/ch
Digital I/O Memory Power
Channels Memory Power
4 Internal 3GB, optional SD card,
and USB slots
External AC Adapter Included

Part Number Description Qty Price
WebDAQ 904 Universal input data logger, internet-enabled, with 4 simultaneous channels, 24-bit resolution, 100 S/s/ch max sample rate, and 4 digital I/O $1,569.00
Accessories & Cables
ACC-205 DIN-rail kit for BTH-1208LS, E-1608, E-DIO24, USB-200 Series (excludes OEM versions), and WebDAQ Series (when used with ACC-404 mounting kit)
ACC-403 6-position detachable screw terminal (2)
ACC-404 Panel/wall mounting kit for WebDAQ Series hardware; use with the ACC-205 to mount on a DIN rail
ACC-405 6-position detachable spring terminal (4)
PS-9V1AEPS230V 9 VDC, 1.67 A replacement power supply, for LGR-5320 Series, SwitchAndSense-8/8, USB-2020, USB-ERB08, USB-PDISO8, USB-PDISO8/40, USB-SSR08, USB-SSR24, WebDAQ Series - interchangeable plugs available separately
More Options...
Australia Plug Australian interchangeable plug for power supplies $10.00
Europe Plug European interchangeable plug for power supplies $10.00
UK Plug UK interchangeable plug for power supplies $10.00
US Plug US interchangeable plug for power supplies $10.00
745690-E001 E-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 1 m
More Options...
745690-E002 E-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 2 m $31.00
745690-J001 J-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 1 m $31.00
745690-J002 J-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 2 m $31.00
745690-K001 K-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 1 m $31.00
745690-K002 K-type thermocouple wire, fiberglass (0 °C to 482 °C, 32 °F to 900 °F) 2 m $31.00
745690-T002 T-type thermocouple wire, fiberglass (0 °C to 260 °C, 32 °F to 500 °F) 2 m $31.00
745691-01 3-wire, 100 ohm RTD, sealed with alumina tube, 1 m $31.00
745691-02 3-wire, 100 ohm RTD, platinum (ready made), 2 m $41.00

Product Reviews

The manual for the WebDAQ 904 only specifies the correct wire configuration for 3 and 4-wire RTD's, so I'm wondering what the required channel inputs are for a 2-wire RTD on this device.

  • Job Title: Research Assistant
  • Industry:
  • Application: Bearing Condition Monitoring
18 months ago
pvorv011 Ottawa


To use a 2-wire RTD, you can select the 3-wire RTD mode, but you also must add your own shorting wire between pin 5 (EX-) pin 6 (CH-).

18 months ago
Measurement Computing

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Safety, Environmental, and Regulatory Information (SERI)    download

Product Manuals

WebDAQ 904


Help Files

Quick Reference Guide
WebDAQ 904 Help
WebDAQ Accessory Installation
WIFI Adaptor Support
WebDAQ Licenses


WebDAQ data file converter      download

WebDAQ REST API      download

WebDAQ REST API Help File    document


Firmware Updates

WebDAQ 904 version 1.3.3
WebDAQ 904 version 1.3.2
WebDAQ 904 version 1.3.1
WebDAQ 904 version 1.3.0
WebDAQ 904 version 1.2.0
WebDAQ 904 version 1.1.21
WebDAQ 904 version 1.1.19
WebDAQ 904 version 1.1.8
WebDAQ 904 version 1.1.0




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