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DI-2008 Thermocouple and Voltage Data Logger

  • 8 differential and isolated channels
  • Voltage or TC Type per channel
  • channel expansion to 128 analogue & 112 digital channels

£499.00£580.00 ex VAT


DI-2008 Thermocouple and Voltage Data Logger

The DI-2008 Thermocouple and Voltage Data Logger is a possible replacement for the discontinued DI-1000TC.

The DI-2008 from DATAQ Instruments features 4 or 8 analogue input channels which are programmable as a thermocouple or voltage input. The data logger also benefits from 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. 

Programmable for Thermocouple or Voltage Measurements

In addition the analogue input channels adapt to a wide range of measurement types and applications. This allows you to independently programme each channel for a thermocouple or voltage measurement. When programmed as a voltage channel, you can select one of twelve measurement ranges from ±10 mV to ±50 V. A range of ±5 V supports 4-20 mA measurements using typically a 250 Ω shunt resistor (model R250 sold separately). If programmed as a thermocouple channel, you can select from eight thermocouple types: J, K, T, B, R, S, E, or N. Linearization and junction compensation are automatically applied by the DI-2008 for the selected TC type to deliver values scaled in °C.

Other Features

The DI-2008 also benefits from a built-in 15 V sensor excitation power supply simplifying external wiring and further reducing the overall system cost. Finally, all analogue measurements benefit from a 16-bit ADC resolution to reveal even the smallest signal variations. Each DI-2008 analogue input is electrically isolated from other channels and from ground for safe and accurate measurements in the presence of common mode voltages. Channel isolation means that each analogue input is free to float to an independent common mode voltage imposed upon it by the signal source up to 120 V rms, and still provide an accurate and noise-free measurement.

Digital Ports Configured as Inputs or Switches.

The DI-2008 provides 7 digital ports, each configurable as an input or a switch. Input protection is provided to 30 V.

When you configure a digital port as a switch, you can be use it to control external loads up to 30 V @ 100 mA. The switch can also be controlled asynchronously without interrupting the scanning process.

If you activate the ports as inputs, you can use two ports with dual functionality as discrete inputs, or one as a counter and the other a rate input. The rate input features a 50 kHz maximum measurement allocated over twelve programmable measurement ranges (10 Hz to 50 kHz full scale). The counter input provides 16-bit resolution and a terminal count value of 65,535. The discrete, counter, and rate inputs are members of the same internal scan list used by the analogue input channels. This means that all enabled elements are acquired synchronously, which allows meaningful comparisons between analogue and digital channels.

For example, the rate input measuring engine speed allows rpm data to be acquired synchronously with analogue data.

Product Features

  • Eight differential and isolated analogue input channels
  • Seven bi-directional digital input ports, including:
    • Counter input for totalizing applications
    • Rate input for frequency/flow/rpm applications
  • ChannelStretch™ channel expansion to 128 analogue and 112 digital channels (Unlock code required per device)
  • Programmable voltage and thermocouple measurements per channel
  • 10 mV to 50 V programmable range per channel in 12 steps
  • Programmable support for type J, K, T, B, R, S, E, N thermocouples per channel
  • High resolution (16-bit) measurements
  • 2000 Hz max sample throughput for a single channel and 200 Hz for two or more
  • Minimum sample throughput rates as low as 1 sample per day
  • USB interface
  • Included WinDaq software for ready-to-run measurements
  • Included .NET class for Visual Studio program development
  • Fully documented device protocol supports other operating systems
Analogue Inputs
Number of Channels: 8
Configuration: Differential, Isolated
Programmable measurements per channel: Voltage, Thermocouple

Programmable thermocouple types and measurement range per channel:

Over 25 ±5 °C ambient temperature range.
Stable ambient temperature.
Following 30 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
Isolation: 350Vpp, Input-to-output, Channel-to-channel
Absolute maximum input without damage: 120 V rms
Maximum common mode voltage: 120 V rms
Min common mode rejection (330Ω unbalance): >100 dB (DC to 60 Hz)
Channel-to-channel crosstalk rejection: (Rsource ≤ 330 Ω; Freqsource ≤ 60 Hz) > 100 dB at any throughput
Digital Inputs
Number of ports: 7
Type: MOSFET switch
Configuration: Programmable as an input or switch
Pull-up value: 4.7 KΩ
Isolation: None
Input high voltage threshold: 2.4 V minimum
Input low voltage threshold: 0.8 V maximum
Absolute max input without damage: 0 ≤ V ≤ 30 V
Digital port assignment: Count: Port 2 configured as input
Rate: Port 3 configured as input
Internal pull-up value: 4.7 kΩ
Input high voltage threshold: 2.4 V
Input low voltage threshold: 0.8 V
Terminal count: 65,535
Maximum rate frequency: 50 kHz
Minimum rate frequency: 0.5 Hz
Maximum count frequency: 50 kHz
Power Consumption: 0.75 Watts (from USB port)
Excitation output: +15 V dc (-7.5% to +2.5%) at 70% load (47 mA), 67 mA at full load
ADC Characteristics
Voltage Measurement Resolution:
Range Resolution
±10 mV 0.305µV
±25 mV 0.763 µV
±50 mV 1.53 µV
±100 mV 3.05µV
±250 mV 7.63 µV
±500 mV 15.26 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: 13,100 ADC counts over the 4-20 mA range (5 VFS range with 250-Ω shunt resistor)
Maximum sample throughput rate: Single enabled channel: 2,000 S/s
Two or more enabled channels: 200 S/s
Minimum sample throughput (hardware): 1 enabled analogue channel: 0.000109 S/s
2 or more enabled analogue channels: 0.000011 S/s
Minimum sample throughput (using WinDaq): .0001969 S/s
Sample rate timing accuracy: 50 ppm
Indicators and Connections
Interface: USB 2.0 (mini-B style connector)
Indicator lights: 3 LEDs: Power, Active, Event
Input Connections: Two 16-position terminal strips
Pushbutton: Manual event when used with WinDaq software
ChannelStretch™ Operation
WinDaq software: If any synced device has two or more enabled analogue channels, all synced devices must enable the same number of analogue and digital channels and the same sample throughput rate. If all synced devices have one or zero enabled analogue channels, sample rate per channel must be the same across all devices. One or more digital ports configured as a discrete input counts as one digital channel. Rate and count inputs count as one digital channel each.
Programmed (.Net- or protocol-based): Sample rate per channel must be the same across all synced devices.
Maximum number of devices: 16
Maximum channel count: 128 analogue, 112 digital
Maximum supported throughput: ≥480 kHz
Synchronization compatibility: DI-2008
PC USB prerequisite: All instruments must be connected to the same USB controller. The use of USB hubs are recommended to meet this requirement.
Operating Temperature: 0 to 70 °C
Storage Temperature: -20 to 70 °C
Storage Humidity: 0 to 90% non-condensing
Physical Characteristics
Enclosure: Hardened Plastic
Mounting: Desktop; bulkhead
Dimensions: 83.31D × 169.67W × 28.7H mm.
Weight: 162 grams
DI-2008 Thermocouple and Voltage Data Logger Specifications DI-2008 Thermocouple and Voltage Data Logger Specifications

DI-2008 Thermocouple and Voltage Data Logger User Manual DI-2008 Thermocouple and Voltage Data Logger User Manual

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