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PRESS RELEASE : New DHI molbox1+ flow terminal offers the lowest uncertainties for gas flow calibration

The DH Instruments Division of Fluke Corporation has announced a major update to its molbloc™/molbox™ gas flow calibration system resulting in significantly improved accuracy. The new molbox1+ flow terminal enables users to achieve ±0.125 percent of reading flow measurement uncertainty, while an added molbox terminal configuration, molbox1+S, improves high flow rangeability and versatility without the need for vacuum pumps.

The molbox1+ flow terminal is the heart of the patented molbloc/molbox gas flow calibration system. It performs the data acquisition and processing functions necessary to precisely determine the flow through a connected molbloc flow element. The molbloc-L laminar flow elements and molbloc-S sonic nozzle flow elements are offered in different flow path sizes to cover a wide variety of flow ranges from 1 sccm to 5000 slm. This combination of precision and very wide range coverage in a single system make it possible for customers to replace multiple traditional volumetric flow standards and use a consistent software interface and reporting function for both low and high flows.

The new molbox1+S configuration makes it easier and less costly to perform high flow calibrations using molbloc-S sonic nozzle flow elements. With molbox 1+S, each molbloc-S element can cover a wider range (10:1 range turndown) without requiring vacuum pumps, saving thousands. The system is viable for in-situ flow meter calibrations because it fits easily on a calibration cart.

DHI offers a full suite of software automation products, and hardware accessories are available to complete the flow calibration system, including COMPASS® calibration assistance software, devices for unit-under-test control and readback.

For more information on molbox1+, molbox 1+S, and other pressure and flow products from DHI, visit To contact the DH Instruments Division of Fluke Corporation, call (602) 431-9100, or email

About Fluke
Fluke Corporation is the leader in precision calibration instrumentation and software for electrical, temperature, pressure, flow, and RF measurements. Calibration products from Fluke and its Hart Scientific and DH Instruments Divisions are found in calibration facilities around the world, including National Metrology Institutes, that demand the highest levels of performance and reliability, backed by state of the art metrology and uncompromising support. They are relied on by quality engineers, calibration technicians, and metrologists to instill confidence in the measurements that are critical to their organizations for quality, safety, reliability, and cost. Fluke and DHI are either registered trademarks or trademarks of Fluke Corporation in the United States and/or other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners.

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