Products may help control fluctuating humidity

April 3, 2000
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At the IAHR Expo, held concurrent with the 2000 ASHRAE Winter Meeting, some modular humidification products may help create “zoned” humidity control that could be applicable to museums, libraries and other applications that require close humidity tolerances and flexibility, such as computer rooms.

Liebert Corp., Columbus, OH, offered the SGH standalone, electronic humidifiers in capacities ranging from 10 to 200 lb/hr of humidification.

The company says the self-contained, steam humidifiers produce mineral-free, odorless, sterile steam and, by means of an auto-adaptive control mechanism, automatically adjust to incoming water conditions.

Contractors should appreciate that the units cost less to install, the company says, because the ducted portion can be separated from the unit. The unit itself can be either duct- or wall-mounted, which eases its serviceability. Extended-life LEDs on the front panel provide full, automatic fault diagnostics.

The unit’s full frontal access and factory-installed safety interlock also increase its ease of service for contractors. The units can be installed to humidify a single zone, or several can be installed for “tailored solutions.”

DGH Systems LLC, Lancaster, PA, introduced its MC 2000 atomizing humidifiers, also with electronic control for maintaining precise rh conditions.

An atomizing humidifier for close-control applications? Accord-ing to the company, the unit “is not an ultrasonic fogging nozzle. It is not a modified paint spray nozzle.

“These types of nozzles may be fine for greenhouses [and other applications] where heavy fog is desired, but in a duct system where wetting can lead to bacterial and viral contamination, or oversensitive production areas, a light, highly controlled, easily evaporated mist is mandated.”

Contractors should appreciate the unit’s 10-part self-cleaning, self-sealing design. It is said to be able to handle water qualities from 75 grains of hardness to ultrapure, 18-megohm deionized water.

At shutdown, a cleaning pin cleans all orifices and seals the head to prevent ambient contamination and dripping, the company says. This would help make the unit more suitable for delicate applications, for both in-duct and in open-space applications. A control cabinet at floor level provides continuous monitoring of the ambient air conditions and allows control of humidity within ±2% rh.

Pure Humidifier Co., Chaska, MN, came out with its INTAC™ humidifier control system, which features a microprocessor-based controller that provides both a digital messaging center and bas communications. The module operates with the company’s humidification units.

The company says the unit is compatible with all humidity transmitters and temperature sensors, as well as all water types. User-adjustable programming provides precise levels of control for both high-limit and controlling sensors.

The unit’s three levels of control are on-off (±5%), time cycle modulation (±3%), or SCR modulation (±1%).

Contractors should appreciate the controller’s high- and low-humidity deviation alarms; an over-temp reservoir shut-down safety interlock; and a dedicated event input that allows contractors to identify a priority safety switch.

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