Chell Instruments launch most accurate pressure scanner ever
most accurate pressure scanner
September 16, 2022

World-renowned gas measurement and control experts Chell Instruments have launched the microDAQ3, the most versatile and accurate pressure scanner currently available on the market.

The use of high accuracy digital sensors, combined with an advanced calibration and temperature compensation techniques, has led to a significant leap forward in performance. The MicroDAQ3 now produces more accurate data than any other pressure scanner – by some margin.

The MicroDAQ3 also has class-leading features – such as its electrically actuated shuttle valve – and manages to do this and be the most compact digital pressure scanner on the market.

“The demanding environments in which our clients use our technology means they demand ever greater accuracy in an ever smaller, faster and more durable package. Our team have worked tirelessly to ensure the microDAQ3 delivers across the board” says Jamie Shanahan, Sales Director of Chell Instruments.

The microDAQ3 leverages technology developed by Chell Instruments within their class-leading microDAQ and nanoDAQ ranges, such as differential and absolute measurements, embedded web server, IEEE 1588 PTP time stamping, power-over-ethernet, CAN, hardware trigger and EtherCAT.

However, the step-forward in performance is largely due to the use of high accuracy transducers which feature two 24-bit analogue-to-digital converters (ADC) per port; one for pressure and one for temperature. This highly stable output is used to almost entirely compensate for thermal effects over its wide operating range.

The increased performance of the microDAQ3 has even led Chell Instruments to adapt a new ‘metrology’ approach to specifying its accuracy.

As with all pressure scanners, the headline accuracy figure is a function of the speed of acquisition and the response of the scanner. However, most manufacturers only publish a headline specification with no information on how this is derived. For the MicroDAQ3, Chell publish the traditional error figure (2 x sigma) together with the standard deviation and measurement uncertainty at different measurement responses. The measurement uncertainty takes into account long term drift, any remaining thermal effects and the uncertainty of the standards used to calibrate them in the Chell UKAS laboratory. This allows to user to know exactly what the performance would be in their situation.

“Accuracy is critical. So, as uncertainties become ever smaller, we need to be able to pinpoint them to help our client understand and account for them” adds Jamie.

The microDAQ3 also offers the option of an electrically driven valve that gives the scanner a purge and re-zero facility. The valve design features precise positional measurement and motor current monitoring for deterministic positioning. It also has useful features such as counting the total number of actuations which can be used to determine if any maintenance is required in the coming years.

However, despite its big specifications, the microDAQ3 is also the smallest digital pressure scanner now available on the market.

“Whatever the application, space is almost always constrained in a testing environment, so making our solutions more compact is critical to increasing their flexibility and suitability for a wide range of applications” concludes Jamie.

The MicroDAQ3 is available now in ranges from 1kPa to 310 kPa (4” water to 45 psi).

North Walsham-based Chell Instruments have been providing pressure, vacuum and gas flow measurement equipment for over 40 years. They design, manufacture and calibrate testing apparatus used in areas including Formula One, aircraft design and pharmaceuticals.

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