 NADP approved for NTN Sites |
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Closed cover sealing sample collection container |
Interior with Glass sample train |
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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 returns 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 amounts 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 gages in NADP installations
How it Works:
The infrared, optical precipitation sensor detects the onset of precipitation and uncovers the sample container within five (5) drops. Within two minutes, after precipitation stops, cover returns to sample container to minimize exposure to dry deposition. Sensor also detects drizzle, heavy fog or light snow, which may carry significant amounts of deposition.
Collection of uncontaminated wet deposition samples is essential to precipitation chemistry validity. Compact design minimizes splash from exterior surfaces. In areas with high wind, the sampler may be fitted with an optional Alter Screen. The compression seal on the underside of the cover prevents leakage of dry deposition in to the container and retards sample evaporation. When the cover System is opened the underside is protected from ground splash by a shield that covers, but does not contact the seal.
Reliability is essential to the collection of valid samples. The ADS/NTN runs interchangeably on either line power (110VAC or 220VAC) or (12VDC) with an optional external power converter. Cover drive is rated for 20 years of typical service. All parts are easy to replace without special tools.
The ADS/NTN is mounted on a 2” NPS pipe by a socket secured with 2 set screws, so that it may be easily rotated.
The sampler also provides a 4 conductor cable to connect to an unpowered auxiliary contact that closes during precipitation events. This contact can operate a user furnished data logger and/or event recorder pen in a Belfort Universal Raingage. System will also interface with a variety of electronic, weighing rain gages.
A normally open contact is also provided for monitoring power continuity.
Technical Specifications:
DIMENSIONS: WEIGHT: MATERIALS OF CONSTRUCTION: PRECIPITATION SENSOR: POWER REQUIREMENTS: GFI (ground fault interrupter) MUST BE USED.
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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: NADP MDN SAMPLE TRAIN: OTHER SAMPLE TRAINS: (19-130) OPTIONAL EXTRAS: |