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HFS DAQ System Description

The HFS DAQ is a low-cost data acquisition system that is designed and packaged together to

accurately measure the small analog DC voltage signals that are outputted from HFS heat flux sensors

and their integrated thermocouples. The HFS DAQ enables precise measurement resolution at a

fraction of the cost to other currently available systems.

Key System Features

- 8 differential input channels for

simultaneous measurements of both heat

flux and temperature from 4 HFS sensors.

- Free software for computer-based user

interface and data recording through a USB

cable connection.

- Automatic zeroing of current bias error for

increased accuracy, especially while using

high impendence sensors.

HFS DAQ System Specifications

Input Voltage Resolution

< 1 µV

Number of Input Channels

8 differential

Cold Junction Compensation

Yes, provided by on-board thermistor

CJC Thermistor Accuracy

2 °C absolute accuracy

Input Voltage Range

+/- 2.048 Volts

Analog-to-Digital Converter Type

24-bit Delta-Sigma

Output Voltage Noise

0.85 µVRMS

Computer Interface Type

USB cable

Overall Package Dimensions*

4.8” x 4.1” x 3.4” (9.6 x 10.4 x 8.7 cm)

Maximum Sampling Rate**

Approximately 3 Hz

Standard Thermocouple Type

Type-T

*Dimensions are specified for our largest HFS DAQ system that includes all the additional features. The height dimension of lower functionality

versions may be smaller than specified.

**Dependent on the number of channels/sensors that measurements are being taken from simultaneously.

HFS DAQ Software Description

The simple, user interface allows for easy control of the software features. While the HFS DAQ is

connected to a computer using a USB cable interface, the heat flux and temperature sensor

measurement signals can be viewed and recorded simultaneously using our free software. The setup

window and real-time plots of the measurement signals are shown.

HFS DAQ

Datasheet