UK Supplier of Data Acquisition & Thermal Imaging systems, software and services


DI-808 Web-based Voltage and Thermocouple Data Logger

  • Built-in web server for Any device
  • Access from Anywhere, Anytime
  • Universal analogue inputs
  • Pulse inputs
SKU DI-808 Series Category Tag

£835.00£915.00 ex VAT


Web-based Voltage and Thermocouple Data Logger from DATAQ Instruments.

Product Features

  • 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
  • 8 differential and isolated analogue input channels programmable as voltage or thermocouple measurement per channel
  • 4 pulse input channels programmable as count, frequency, or discrete function per channel
  • 4 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
    • Analogue and pulse input levels
    • Alarm status
    • Date/time/day-of-week
  • 20 programmable sampling intervals ranging from 25 mS to 1 hour
  • Built-in Ethernet interface


Web Server

The DI-808 has a built-in web server which allows you to access, configure, manage, and oversee all aspects of the instrument’s measurement in real time. The Ethernet interface allows integration with any existing local area network (LAN) or virtual private network (VPN.) Using the internet via simple port forwarding allows remote access from any location.

Data Logger

8 analogue 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, such as: grounded thermocouples, powered thermocouples, off-ground current shunts, as well as unexpected and unknown ground potential differences.

Complementing the analogue input channels are 4 pulse inputs. Each input can be independently programmed for simple state detection, to operate as a counter, or make a frequency measurement. These allow you to acquire various data types such as volume data from a flow sensor (count), and flow rate (frequency.) Other examples include rpm measurements or simple counting in production or product life test applications.

Both analogue and pulse measurements are synchronously reported in the same sampling interval, and all measurements are time-and-date-stamped. Program sampling intervals 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.

Alarm Outputs with E-mail / Text Alerts

The DI-808 also includes 4 alarm output channels that you can use 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.


Analogue 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 centre pin, 5 mm shell
Status light: One multicolour LED indicating status
Alarm lights: 4 multicolour 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
Storage Temperature: -20 to 70 °C
Storage Humidity: 0 to 90% non-condensing
Physical Characteristics
Enclosure: All-metal. Steel top, aluminium base
Mounting: Desktop; bulkhead with optional brackets
Dimensions: 13.81D × 10.48W × 3.81H cm
Weight: 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
Analogue 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, channel 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.
DI-808 Specifications DI-808 Specifications

DI-808 User Manual DI-808 User Manual

Request further information on this product below