If moisture is absorbed from the environment by surface-mounted components, and then the components are exposed to high temperatures, as in solder reflow ovens (by convection, infrared, IR/convection, vapour phase, hot air rework tools, etc), then the absorbed moisture will expand rapidly, causing internal device stress. The resulting stress can cause internal or external cracking, delamination, and internal corrosion in the components.
Mekko offers a range of drying cabinets that are equipped with active desiccant rotor drying units, which continuously regenerate the desiccant. This means that only the cabinet and electricity is required, eliminating the requirement for any extra consumables or services to operate the unit.
All models are equipped with a desiccant rotor drying unit. This unit is installed inside the cabinet to keep the internal humidity at less than 5%RH. The operator can select continuous operation, or automatic control by an RH meter. Valuable components are protected from micro-cracking and delamination by using active desiccant, rather than baking.
Principle of operation
The drying unit is built into the base of the cabinet. The powerful absorbing desiccant rotor system incorporating Mekko's 'MTX-flow' technology, whereby the desiccant rotor rotates in two separate streams of air. One sector has air flowing through it within the cabinet (moisture absorb), while a smaller sector uses an external heated air flow to regenerate the desiccant (moisture release). As the disk rotates, fresh, dry desiccant is always presented to the process air flow.
Much research was done on the air flow. This unique air flow system optimises the drying and regenerating ability with minimal air leakage into the cabinet.
Cabinets
The cabinets are free-standing and self-controlled, and do not require nitrogen or compressed air. They comply with IPC/JEDEC J-STD-033, which details recommendations for handling, packing, shipping and use of moisture/reflow sensitive surface mount devices. The RH meter and digital thermo-meter are included in the cabinet, viewable through door. Mains electrical supply is 230 V a.c., 1 kW max. (ave. power is approx. 100 W). They are electrostatic safe and conform to ESD standard EN 61340-5-1.
Designing with PCIe Spectrum Concepts
Editor's Choice Interconnection
PCI Express has become the backbone of modern high-performance systems with each new generation promising higher bandwidth, but that performance comes with a cost.
Read more...Connectivity solutions for hydrogen technologies Hiconnex
Interconnection
As the production distribution and utilisation of hydrogen continue to scale, connectivity becomes a key enabler for efficient energy transmission, data communication, and system control.
Read more...Robust single-pole power connectivity Hiconnex
Interconnection
Designed for cable-to-cable and cable-to-equipment use, Radiall’s single-pole power connector support current ratings from 250 A to 750 A and operating voltages up to 1000 V AC or DC.
Read more...M12 push-pull connectors IOT Electronics
Interconnection
Phoenix Contact’s M12 push-pull connectors with internal locking set a new benchmark for fast, secure, and space-saving connectivity in industrial automation.
Read more...Versatile outdoor waterproof connectors Vepac Electronics
Interconnection
The LP-20 outdoor waterproof connector series offers a versatile range of rugged, circular connectors with 2, 3, 4, 5, 7, 8, 9, 12 and 14-pin configurations.
Read more...Comprehensive range of data connectors IOT Electronics
Interconnection
Phoenix Contact’s comprehensive range of data connectors provides reliable connection solutions for modern networked applications across industrial, infrastructure, and commercial environments.
Read more...Compact inline connector for aerospace Hiconnex
Interconnection
Radiall’s Small Inline Connector series is a fully qualified wire-to-wire solution designed to simplify harness creation, installation, and modification in aerospace applications.
Read more...Compact hybrid power storage connector IOT Electronics
Interconnection
Phoenix Contact has introduced a new hybrid connector for electrical energy storage systems, designed to combine power, signal, and data transmission in a single, compact interface.
Read more...MIL-spec connector series Future Electronics
Interconnection
The MIL-HD2 connector series from Amphenol is the company’s next-generation, SOSA-aligned solution engineered to meet the most demanding requirements of modern military embedded systems.
Read more...DC connectors approved for 2000 V IOT Electronics
Interconnection
Phoneix Contact’s Sunclix DC connectors are now approved for system voltages of up to 2000 V in accordance with TÜV Rheinland’s new test specification, opening the door to higher-voltage PV designs and reduced system costs.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version