GENERAL OPERATING PRINCIPLES
Air is pressurized in a free standing pump and directed through an optional pollution filter to a proprietary mechanism in the main module. In the Mini One module, moisture is either removed or added by the single mechanism. This air is directed through a small flexible tube to an input port in the showcase. Air flow to the enclosure is constant.
In normal applications the air is delivered only at the preset relative humidity. Higher or lower humidity feeds will be used to balance showcase leakage and other demands, returning to constant humidity feed when appropriate.
An optional valve with integrated sensor (the sensor / valve) may be used to guarantee an unchanging humidity feed, and will isolate the showcase from the airflow should the feed humidity exceed preset limits. (The sensor/valve must be used for multiple enclosure applications, with a total volume usually not exceeding five cubic meters.)
A direct feed (with no sensor / valve) can provide extremely effective operation, allowing the Mini one to control humidity on very large or leaky cases (see below)
The Mini One can be operated in a variety of modes, depending on enclosure characteristics, ambient humidities and acceptable control limits.
Sensor / Valve Operation
Incorporation of the sensor / valve in the feed line typically provides extremely accurate humidity control; the unit neither adds nor subtracts moisture from the air in the showcase; the Mini One gently feeds a steady stream of positive pressure air into the showcase at the target humidity to displace the existing air and pollutants in the enclosure, which is forced out past gaskets and through small existing leaks.
When using the sensor / valve, output from one unit may be distributed to more than one showcase.
Very Large Volume Showcases
When feeding the air stream directly to the case, and locating the sensor at an appropriate distance from the incoming air, very substantial volumes can be controlled by a single unit. It is important to note that case leakage and ambient humidity levels can have a dramatic effect on the unit's capacity.
The unit may be placed immediately beneath or next to the showcase, or up to 75 ft / 20 m away.
Remote Air Sources
The pump module may be separated from the main module at some distance, or multiple units may be fed by a single remote pump or nitrogen generator.
A return hose may be used to reduce water consumption where ambient humidity levels are drier than showcase targets.
Input air from the humidification module can be monitored at the input port valve/sensor in the showcase. (The integrated automatic valve ensures that the showcase air feed is stopped should the humidity exceed preset limits.) The combination of sensor and valve makes troubleshooting easy in new installations.
Remote Reservoir Pump
The Mini One provides a switched set of contacts for attaching a 12V remote pump on a separate reservoir. When engaged, the remote pump will automatically refill the onboard reservoir.
When necessary, the Mini One will use water from the built-in reservoir to raise the RH of the air entering the enclosure. In dry conditions this demand may be substantial, and use of the remote pump is suggested (see above). Click here for more information on how to estimate the unit's water consumption.
Minimum Humidity Settings
At normal room temperatures (22 C / 71.5F) the unit can theoretically achieve an RH output of 25%. Lower ambient temperatures will substantially limit minimum achievable humidity, and we do not recommend settings below 35%. Click here for more information on minimum humidity settings.
The Mini One is well suited for close control of humidification chambers, where humidity levels can be ramped and maintained as needed.
SPECIFICATIONS Build 2011-6:
Dehumidification Capacity at ambient conditions of 22ºC, 65% RH: > 6 gm/hour (basis 30% RH output)
Humidification Capacity at ambient conditions of 22ºC, 35% RH: >9.5 gm/hour (basis 85% RH output)
Humidification Capacity from dry (eg dry nitrogen feed) conditions of 22ºC, 5% RH: >9.5 gm/hour; (basis 55% RH output)
Maximum Power Consumption: 240 Watts
Typical Power Consumption: 140 Watts
Power Source: 105 ? 120 or 210 ? 230 Volts, 50 or 60 Hz
System Internal Voltage: 12 Volts DC
Shipping Weight: 14 kg (31 lb)
Output: Constant airflow of 30% to 80% RH, with a variation of +/- 1% @ 22 degrees C (typical)
Output Volume: 24 cubic meters / day (850 cubic feet / day) ? typical @ 60 Hz
Output Pressure: < 2.5 inches H2O / 600 Pa
Multiple Feeds: Single unit may feed many showcases (Optional)
Operating Temperatures: 15 to 27 degrees C (60 to 80 degrees F) (Ambient temperatures will affect control capacities)
Sensor Element: Capacitive thin film sensor
Sensor Reading Accuracy: +/-2% over mid range
Sensor Repetitive Accuracy: +/-1%
Bypass Valve: (Optional) Automatic, typically triggered at +/- 3% from target (adjustable) to isolate showcase
Pollution Filters: (Optional) In line activated carbon, or as operator specified
Communication: RS- 485 for data capture and unit control (with optional software)
Onboard Reservoir Capacity: 2 liters
External Reservoir Capacity: unlimited
Water level Indicator: Three LED indicators on front panel (Low, Medium, High)
Low Water Alarms: Panel LED and remote LED indicator on flexible lead
Remote Reservoir Fill Pump: 12 vDC powered contacts to replenish reservoir via remote pump (optional)
RH Alarm Indicator: Panel LED and remote LED indicator on flexible lead
Biocides: Copper components, chilled compartments and TiO2 mesh
Installation Options: Modules may be stacked, placed adjacent to each other, or separated by up to 10 m (30 ft) or more. Neither module need be in the controlled showcase.
Standard Components: Unit consists of humidity adjustment module, a pump module, one sensor/valve, supply hoses, signal and power cable(s), operator?s manual
Positive Pressure Mode: A single air supply tube and inlet port is used. Showcase inlet port size: > 10 mm (0.25?) min diameter. Do not block inlet or airflow into vitrine. Pressure relief holes or air exits in the showcase are NOT necessary
Recirculating Mode (Optional) An additional outlet port and air return line from the showcase to the pump module may be used to reduce water consumption.
Control Module Dimensions: W 40.5 cm (16 in) X D 39 cm (15.25 in) X H 18 cm (7 in)
Pump Module Dimensions: W 23 cm (9.1 in) X D 23 cm (9.1in) X H 16.5 cm (6.5 in)
Sensor/Valve Dimensions: 21 X 7.5 X 7.5 cm (8.25 X 3 X 3 in)
Installation Footprint: Main Unit: W 45 cm (18 in) (includes 2.5 cm at each side) X D 50 cm (20 in) (includes 1 cm rear and 11 cm front). Add 24 cm 10 in) to width for pump (unless remotely located, or placed on top of Control Module)
Vertical Dimensions: 19 cm (7.5 in) in when pump is remote or adjacent to main unit. Total H is 33 cm (13 in) when pump module is located upon top of main module
Ventilation: Appropriate air vents must be supplied and exhaust hose connected as per operator?s manual
Drainage: Any condensate that is not sequestered in the reservoir will be directed to a drip pan (not supplied). In almost all situations, this will evaporate quickly into the unit?s exhaust air, and no drain will be required.
Links to Useful Pages
Below are some pages that may be helpful when setting up or operating a Mini One microclimate generator:
Estimating your water consumption
Determining minimum air flows to showcases (RH Calculator)