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Reliable and Valid Sample Collection |
NADP approved |
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Closed cover sealing sample collection container |
Open cover resting on splash shield |
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Reliable and Valid Collection: NADP approved for MDN sites.
Collection of uncontaminated samples is essential to the validity of precipitation chemistry. The MDN’s compact design minimizes splash from exterior surfaces and self induced wind turbulence. A compression seal on the underside of the cover prevents leakage of dry deposition into the container and retards sample evaporation.
When the sampler cover is opened, the underside is protected from ground splash by a shield that covers, but does not contact the seal. An infrared, optical precipitation sensor detects the onset of precipitation and uncovers the sample container within sensing 5 drops. Within two minutes after precipitation stops, the cover re turns to seal the collector funnel and minimize exposure to dry deposition. Sensitivity may be changed in the field. Sensor also detects drizzle, heavy fog or light snow, which may carry significant am ounts of deposition
Thermostatically controlled heating and ventilating fan in the housing optimizes sample preservation. Heating of collection funnel minimizes snow build-up. A thermoelectric refrigeration system is available for extremely high ambient installations. Heavy duty cover drive is rated for 20 years of typical service. All parts are easy to replace without special tools.
The MDN is easily mounted on a 2” NPS pipe by a socket secured with 2 set screws, The control system provides an auxiliary contact that closes during precipitation.. This contact can operate a user furnished data logger or event recorder pen in a Belfort Universal Rain gage. System will also interface with a variety of electronic weighing rain gauges in NADP installations.
DIMENSIONS: 34” (86 cm) Wide (less sensor) 19” (46 cm) Deep (less splash shield) 27” (68 cm) High WEIGHT: Net: 71 Pounds ( 24 Kg) Shipping: 80 Pounds ( 32 Kg.) MATERIALS OF CONSTRUCTION: Housing: Aluminum Alloy, seam welded White polyester powder coat Sample collector cover: Aluminum alloy, seam welded White polyester powder coat PRECIPITATION SENSOR: Type: Infra-red transmitter and receiver Opening: Within 5 drops of onset of precipitation Closing: Within 2 minutes of end of precipitation (May be field adjust ed to suit site conditions) POWER REQUIREMENTS: 115VAC or 220VAC (must be specified) Max: with all heaters 10Amps @ 115 VAC 5Amps @ 220 VAC Internally fused with lightning protector GFI (ground fault interrupter) MUST BE USED. OUTPUT FOR DATA LOGGER or EVENT RECORDER: 1 Unpowered, normally open contact is closed for the duration of the sampling event. 1 Unpowered, normally open contact is closed to indicate system power is on. |
MOUNTING: Direct mounting on 2” NPS pipe (2.375 Dia. 68mm Dia.) With mounting collar and 2 set screws SAMPLE TRAINS: (19-128) Glass funnel, glass anti-evaporation capillary, glass sample bottle (2 liter) (19-130) Polyethylene funnel with connector a nd 1.5 liter HDPE sample container OPTIONAL EXTRAS: 17-125 Thermoelectric refrigeration system to replace Exhaust fan assembly. |
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