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Model DI-808

Eight-channel Web-based Voltage, Thermocouple, and Pulse Data Logger


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  • Includes a DI-808 instrument, a screwdriver for signal connections, a power supply, and an NIST-traceable calibration certificate
  • No software to install
  • Intelligent data logger with built-in web server works with with any device using a modern web browser
  • Stores data locally to internal flash memory or a USB thumb drive and/or remotely to any accessible server or email address
  • Allows remote real time display and configuration
  • Eight differential and isolated analog input channels programmable as voltage or thermocouple per channel measuring ±10mV, ±25mV, ±50mV, ±100mV, ±250mV, ±500mV, ±1V, ±2.5V, ±5V, ±10V, ±25V, or ±50V; or Thermocouple types J, K, T, B, R, S, E, or N
  • Four pulse input channels programmable as count, frequency, or discrete function per channel
  • Four real-time discrete alarm output channels with email/text notification
  • Automatic time and date stamping
  • Flexible triggering selections start and stop data recording based upon
    • Analog and pulse input levels
    • Alarm status
    • Date/time/day-of-week
  • 20 programmable sampling intervals ranging from 25 mS to 1 hour
  • 16-bit analog measurement resolution provides even the smallest changes in applied voltage and temperature
  • Use HMP60 Probe for Temperature and Humidity Measurements
  • Built-in Ethernet interface
  • CE approved
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DI-808 Web-based Thermocouple Data Logger
DI-808 Web-based Thermocouple Data Logger Front Panel DI-808 Web-based Thermocouple Data Logger Rear Panel DI-808 Web-based Thermocouple Data Logger
This data logger features 8 analog input channelsThis data acquisition system has four digital inputs and four digital outputs
This data logger has an Ethernet interfaceThis data logger stores data to internal memoryThis data logger can save data directly to a USB flash drive
Get same day shipping when you order this data logger before 3PM ETThis data acquisition system has a 30-day Money back guaranteeThis data logger is manufactured in the United States of America


DI-808 Web-based Voltage and Thermocouple Data Logger system. Features 8 isolated analog input channels programmable as a thermocouple or voltage input, 16-bit measurement resolution, and a full scale range of ±10mV to ±50V for voltage measurements or Thermocouple types J, K, T, B, R, S, E, or N.

Model DI-808 is a giant step forward in the evolution of data logger technology toward autonomous and device-independent operation. Its built-in web server allows you to access, configure, manage, and oversee in real time all aspects of the instrument’s measurement process using any device with a web browser running under any operating system. Just as you can navigate to Yahoo! using your favorite smart device, that same device can be used without exception with the DI-808. And because intelligence is built into the instrument, third party cloud services with their associated security risks and fee-based structures are avoided entirely. You stay in control at all levels, from device configuration and real time monitoring, to the acquired data and alarms the DI-808 places on your smart device. The DI-808’s Ethernet interface allows it to integrate with any existing local area network (LAN) or virtual private network (VPN.) And simple port forwarding exposes the instrument to the Internet, allowing remote access from any location on the planet.

Built around the DI-808’s web server is a powerful data logger engine that adapts to a wide range of analog and pulse measurements. Eight analog input channels feature channel-independent voltage and thermocouple configurations. Voltage measurements support ±10 mV to ±50 V measurements across twelve programmable ranges. Thermocouple configurations support J, K, T, B, R, S, E, and N types. Full channel isolation allows virtually any measurement in tough industrial environments: grounded thermocouples, powered thermocouples, off-ground current shunts, as well as unexpected and unknown ground potential differences. Complementing the analog input channels are four pulse inputs. Each can be independently programmed for simple state detection, to operate as a counter, or make a frequency measurement. Use these functions to acquire, for example, volume data from a flow sensor (count), and flow rate (frequency.) Other examples are rpm measurements or simple counting in production or product life test applications. Both analog and pulse measurements are reported synchronously in the same sampling interval, and all measurements are time-and-date-stamped. Sampling intervals are pro-grammable as often as once every 25 mS or as infrequently as once every hour, with 18 selectable intervals in between. There’s even an external option to synchronize sampling to external events.

The DI-808 also provides four alarm output channels that can be used to flag exceptions during a recording. Each discrete output can be used to signal a PLC, turn on an alarm, or otherwise used as demanded by the application. Each alarm output is also linked to the web interface, where an email alert (or text alert, if supported by your provider) can be triggered when the alarm activates.So, even though you may be miles from the instrument, you’re only a few swipes on your smart device away from real time process updates.

The DI-808 supports exceptional triggering flexibility to determine when the data logger should start and stop recording data, and when alarms should be activated. All or any subset of analog and pulse input channels can be tested, and conditions that stop and start record-ing can be entirely different. The start and stop recording processes can be a function of input levels, an alarm state, a specific date and time and day-of-the-week. Level tests support single and dual modes. Single levels support above- and below-threshold tests. Dual levels test inside or outside a trigger window. All enabled trigger conditions per analog or digital input can be combined in a selectable Boolean AND/OR function to further refine trigger definitions. So, if you want to begin recording when channel 2 exceeds 34 psi AND when channel 5 is greater than 84 but less than 127 pounds, and then stop recording at 10 pm on Sunday evening, you can do it. You can even configure the instrument to re-trigger itself automatically. Finally, when the DI-808 completes a start/stop recording cycle it can be con-figured to send data to one or all of five destinations ranging from local to remote servers, multiple email addresses, and even a USB drive with built-in flash memory (4GB standard, 32GB optionally) providing transparent backup.



4-20mA current loop shunt resistor

R250 Shunt Resistor


Precision 250 Ω resistor, 0.1%. Learn More


Temp/RH Probe

Temperature and Humidity probe


Temperature and humidity probe measures -40 to +60 °C and 0 to 100% RH. Learn more.


Screw Terminal Block (Top)

16-port screw terminal block


Replacement 16-port removable screw terminal block for TOP of screw terminal block receptacle in DI-78B, DI-710, DI-718B, DI-4718B, DI-718Bx, DI-785, DI-788, and DI-808 products.


Screw Terminal Block (Bottom)

16-port screw terminal block


Replacement 16-port removable screw terminal block for BOTTOM of screw terminal block receptacle in DI-78B, DI-710, DI-718B, DI-4718B, DI-718Bx, DI-785, DI-788, and DI-808 products.


Mounting Brackets

Right-angle Mounting Brackets


Pair of angle mounting brackets (with mounting screws) for DI-710 Series, DI-718B Series, DI-100TC Series, and DI-808 Series instruments.


Power Connector

Power Connector


DC power connector for powering the DI-808 or DI-4718B from a source other than the provided ac adaptor.


Power Supply

Spare power supply for DI-808 Web-based Data Logger


Spare power supply for DI-808 products.


Calibration Certificate

NIST Calibration Certificate


Re-calibration Service, this calibration certificate is included with new instruments. NIST-traceable certificate for model DI-808 web-based voltage and thermocouple data logger. Includes before and after data. Shipping charges do apply when ordering online. Learn more about Calibrating your device.


WinDaq Waveform Browser (Hi-Res)

Data Playback Software

FREE Hi-Res WinDaq Waveform Browser Playback software. Allows you to view data files recorded with WinDaq Acquisition software or the DI-808 Web-based data logger.

WinDaq Playback HiRes

Advanced CODAS


Advanced analysis software add-on to WinDaq Waveform Browser software. Allows calculated channels, derivative, integration, moving average, automatic file management, automatic scaling, and more.

Advanced CODAS


Analog Inputs
Number of Channels: 8
Configuration: Differential, Isolated
Isolation: Input-to-output, channel-to-channel
Programmable measurements per channel: Voltage, Thermocouple
Programmable thermocouple types and measurement range per channel:

Over 25 ±3 °C ambient temperature range.
Stable ambient temperature.
Following 60 minutes warm-up.
Excluding common mode error.
Excluding thermocouple error.
Thermocouple Type Temperature Measurement Range (°C) Accuracy (°C)
J -190 to 1200 ±(0.1% of span + 2)
K -180 to 1360 ±(0.1% of span + 2)
T -190 to 400 ±(0.1% of span + 1)
B 600 to 1000
1001 to 1810
±(0.2% of span + 4)
±(0.1% of span + 3)
R -40 to 300
301 to 1760
±(0.2% of span + 6)
±(0.1% of span + 3)
S -40 to 400
401 to 1750
±(0.2% of span + 6)
±(0.1% of span +3)
E -160 to 990 ±(0.1% of span + 1)
N -170 to 50
51 to 1290
±(0.1% of span + 3)
±(0.1% of span + 1)
Programmable voltage measurement ranges per channel: ±10 mV, ±25 mV, ±50 mV, ±100 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, ±10 V, ±25 V, ±50 V
Voltage measurement accuracy:
At 25 °C ambient temperature.
Following 30 minutes warm-up.
Excluding common mode error.
±(0.05% of range + 10 µV)
Input impedance: 1 MΩ, all ranges
Absolute maximum input without damage: 120 V (±dc or rms)
Maximum common mode voltage: 120 V (±dc or rms)
Min common mode rejection (330Ω unbalance): >110 dB (DC to 60 Hz)
Channel-to-channel crosstalk rejection: (Rsource ≤ 330 Ω; Freqsource ≤ 60 Hz) > 110 dB
Alarm and trigger hysteresis: Voltage: ±0.5% of the full scale range
Temperature: ±0.3 °C
Digital/Pulse Inputs
Number of Channels: 4
Pull-up value: 4.7 KΩ
Isolation: None
Input high voltage threshold: 1.8 V minimum
Input low voltage threshold: 1.4 V maximum
Absolute voltage input without damage: 0 ≤ V ≤ 30 V
Maximum count value: 232 - 1 (.csv format)
65,535 (WinDaq format)
Maximum measured frequency: >100 kHz (.csv format)
65,565 Hz (WinDaq format)
Alarm Outputs
Number of channels: 4
Maximum drain voltage: 30 V
Maximum sink current: 100 mA
ADC Characteristics
Voltage Measurement Resolution:
Range Resolution
±10 mV 305 nV
±25 mV 763 nV
±50 mV 1.52 µV
±100 mV 305 µV
±250 mV 763 µV
±500 mV 15.3 µV
±1 V 30.5 µV
±2.5 V 76.3 µV
±5 V 152.6 µV
±10 V 305 µV
±25 V 763 µV
±50 V 1.53 mV
Thermocouple Temperature Measurement Resolution:
TC Type Resolution
J 0.086 °C
K 0.096 °C
T 0.037 °C
B 0.096 °C
R/S 0.111 °C
E 0.073 °C
N 0.092 °C
4-20 mA current loop resolution: 26,214 ADC counts over the 4-20 mA range (±5 VFS range with 250-Ω shunt resistor)
Programmable sampling intervals: 25, 50, 100, 250, 500 mS
1, 2, 5, 10, 20, 30 S
1, 2, 5, 10, 20, 30 minutes
1 hour, External
Internal Memory
Type: Non-volatile flash
Size: 4 GB (standard); 32 GB (optional)
Use: Automatic backup of recorded data
Indicators and Controls
Signal I/O: Dual, removable 16-position screw terminal connectors
Power connector: 2.0 mm center pin, 5 mm shell
Status light: One multicolor LED indicating status
Alarm lights: 4 multicolor LEDs
Ethernet interface connector: RJ45
USB drive receptacle: Type A male
USB connector: Mini B style (usage is reserved)
Control button: Push type to set device operating mode
Ground: Screw terminal to establish Earth ground.
Power I/O
Input power requirements: 9-36 V dc @ 7.5 Watts
9-36 V dc @ 10 Watts (w/excitation)
Excitation power supply output: 15 V, 130 mA max, 13 mA min
Operating Temperature: 0 to 70 °C (32 to 158°F)
Storage Temperature: -20 to 70 °C (-4 to 158°F)
Storage Humidity: 0 to 90% non-condensing
Physical Characteristics
Enclosure: All-metal. Steel top, aluminum base
Mounting: Desktop; bulkhead with optional brackets
Dimensions: 5.4375 D × 4.125 W × 1.5 H inches
13.81D × 10.48W × 3.81H cm
Weight: <1lb. (453 grams)
Configurable Components
Network variables: IP address, Subnet mask, Gateway, DNS
Account log-on information: For FTP, SFTP, SMB, SMTP
User log-on information: User and administrator names and passwords
Supported Standards
Network Time Protocol (NTP): Syncs internal time and date clock to Internet time
File Transfer Protocol (FTP): Allows the instrument to push re-corded data to an FTP server
Secured File Transfer Protocol (SFTP): Allows the instrument to push re-corded data to an SFTP server
Server Message Block (SMB) protocol: Allows the instrument to record data to a local server drive
Simple Mail Transfer Protocol (SMTP): Allows the instrument to send data and alarms to multiple email addresses
Display Subsystem
Digital display: Numeric display of acquired values scaled into engineering units in real time. Selectable precision of 1 to four digits to the right of the decimal point.
Waveform display: Scrolling plot of selected channel data in real time versus time of day.
Alarms status: Virtual LEDs display the status of the four alarm outputs
Channel Settings Subsystem
Analog channel configuration: Voltage and measurement range, temperature and thermocouple type, moving average filter, engineering units, channel label
Digital/pulse channels: Discrete, count, count with reset, frequency, engineering units, chan-nel label
Trigger Subsystem
Start or stop recording trigger conditions: Level: Above/below level, In/out window
Alarm: Upon alarm activation
Date/time: Specific date and time. Daily selection
Auto rearm: Enabled or disabled
Alarm Subsystem
Level or edge selection: Level: Alarm is activated when alarm condition is met on first encounter
Edge: Alarm is activated only after first not being met.
Analog/pulse channel levels: Above/below level, In/out window
Thermocouple burnout: Any burnout detected on a Thermocouple channel
Selectable alarm ports: 1-4
Alarm hold: Enable/disable
File Subsystem
File browse/download: Browse files on the DI-808 internal flash memory or connected USB drive and allow selectable down-loads to the client device.
Format local file storage: Formats internal flash memory, erasing previously recorded files and reallocating file space for new recorded data.
Get local file space: Returns the available file space.
Base file name: Allows recorded files to be assigned a definable file name, and to option-ally have date and time appended.
File type: Allows the recorded file format to be defined as either ASCII CSV or binary WDH.
Device Subsystem
Device settings and information: Program device sampling interval, temperature units (°F/°C), enable or disable auto start on boot feature, time/date/ synched to connected PC or NTP server, reboot device.
Network configuration: Configure device IP address, DNS, Subnet mask, Gateway.
Users and accounts: Configure user and administrator names and passwords.


Introduction to DI-808 Web-based Data Logger Interface
DI-808 Features

A quick look at the features on the DI-808 web interface including channel settings, triggers, alarms, and more.
The DI-245 and Common Mode Rejection
Common Mode Rejection

This video demonstrates the ability of the DI-808 to reject common mode voltage. Very impressive!
Making Thermocouple Temperature Measurements Using a DATAQ Instruments Data Logger
Thermocouple Data Acquisition

Learn how to make Thermocouple Temperature Measurements Using a DATAQ Instruments Data Logger.

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Model Analog
Expandable* Measurement
Max Sample
Rate (Hz)
Interface Data Storage Price
DI-2008 8 Yes A Yes 200 16 7 Bi USB PC $299
DI-808 8 - A Yes 40 16 4 In 4 Out Ethernet Internal, USB flash, Cloud $995
DI-4718B-U 8 - C Yes (DI-8B) 160,000 12 to 16 2 In USB PC or USB flash $795
DI-4718B-E 8 - C Yes (DI-8B) 160,000 12 to 16 2 In USB, Ethernet PC or USB flash $695
GL240 10 - B Yes 100 16 4 In 4 Out USB PC, USB flash, Internal, Cloud $995
GL840-M 20 Yes B Yes 100 16 4 In 4 Out USB, Ethernet PC, USB flash, Internal, Cloud $2345
DI-718B-US 8 - C Yes (DI-8B) 14,400 14 2 In USB PC or SD Card $695
DI-718B-ES 8 - C Yes (DI-8B) 14,400 14 2 In Ethernet PC or SD Card $895

*Expansion capabilitie dependent on model.

Use the following chart to determine Measurement Ranges:

A B C*
±10 mV
±25 mV
±50 mV
±100 mV
±250 mV
±500 mV
±1 V
±2.5 V
±5 V
±10 V
±25 V
±50 V
±20 mV
±50 mV
±100 mV
±200 mV
±500 mV
±1 V
±2 V
±5 V
±10 V
±20 V
±50 V
±100 V
1-5 V
±10 mV
±50 mV
±100 mV
±1 V
±5 V
±10 V
±20 V
±40 V
±60 V

*Dependent on 8B module.