The Sentinel 5855 (and 5856) systems uses one or more Sentinel nozzles attached to a low pressure air manifold to atomize a liquid into small droplets. Nozzles can be pipe-mounted or hose-mounted.
The controller, with several control options, regulates fogging activity, are available. These include a one-shot countdown timer, programmable 7-day timer and repeating cycle timer; humidity sensor/controller; or customer-supplied external device - anything that can close a switch (manual, contact, PLC, process controller, etc.).
The Sentinel nozzle creates a highly turbulent zone, dices liquid into droplets, and ejects it as a fast moving fog plume. Droplet size is adjustable, from less than 5 microns VMD to more than 40 microns.
This method ["cold fogging"] does not require high pressures, small orifices or hot surfaces for atomizing liquid. It works with both water- and oil-based liquids, and can atomize light suspensions (finely divided solids dispersed in a liquid carrier). And since the Sentinel nozzle has no small orifices, plugging is not a problem.
Nozzles are available in several materials. The standard nozzle uses Celcon® acetyl copolymer for internal elements; for fogging strong oxidizers, such as hydrogen peroxide and glutaraldehyde, HPDE elements are preferred; and for work in high temperature environments or involving erosive materials, nozzles are available in 316 stainless steel.
For technical details and performance data, see FTN-022.
Applications Uses of the Sentinel 5855 system include:
- Odor control at composting facilities, sludge drying sheds, septage receiving areas, lift stations, wastewater treatment plants, exhaust stacks, and so forth;
- Fogging of chemical sanitizers or disinfectants in clean rooms, agricultural production facilities, and, with a hose-mounted nozzle, treatments to ambulances, school busses, vans, shipping containers;
- Pest control (production agriculture, food products storage, warehouses);
- Production processes needing to atomize liquids or suspensions;
- Other atomizing applications with heavy duty-cycles and/or repeat cycle frequency.
Cart Mounting / Portable Applications For applications requiring portability, the 5855 can be mounted on a 2-wheeled cart. This carries controller, pump, blower (max size: 1.5 Hp), and one or two nozzles (pipe or hose mounted).
Liquid Supply The Sentinel 5855 can use a pump to supply fogging liquid from a pail, drum or tote. It can also draw from a solenoid valve to an elevated tank or water line. The carrier liquid can be premixed to the final dilution, or mixed in-line by a 5250 proportional injector.
The control module includes relay contacts to open the valve or activate a supply pump. Although any type of pump can be used, peristaltic pumps are often preferred. They are self-priming, available in the low GPM ratings used in fogging, and often have variable output drives.
A white paper, Liquid Supply Considerations for Sentinel® 5855 atomizing systems, provides useful background information on selecting equipment and designing the supply piping.
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 Control Unit
(with 7-day clock and cycle timer)
 Sentinel 701SS nozzle
Sentinel 5855, optional cart and
ZPF lift station odor control module
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