[{"sku":"LI-191R","title":"LI-COR LI-191R Line Quantum Sensor ","subtitle":"Efficiently measures PAR over a 1-meter length ","variant_product_name":null,"unit_price":0,"brands":["HOBO"],"region":null,"service_plans":[],"parcel_length":null,"parcel_width":null,"parcel_height":null,"parcel_weight":null,"sellable":true,"published":true,"product_page_url":"\/products\/sensors\/li-191r","nid":"23161","product_description":"<p>Used to measure sunlight under a plant canopy where the light field is non-uniform, the LI-191R Line Quantum Sensor measures PAR with a single detector integrating measurements over its 1-meter length. The LI-191R makes it easy to measure under-canopy light in many plots quickly and consistently. It measures light in units of Photosynthetic Photon Flux Density (PPFD), which is expressed as \u03bcmol s-1 m-2.<\/p><h3>Why choose the LI-191R PAR Light Sensor?<\/h3><ul><li>Improved water resistance for long-term outdoor deployment<\/li><li>Integrated measurements using a single detector prevents variance found in sensors that use multiple detectors<\/li><li>Selected by the National Ecological Observatory Network (NEON\u00ae) for integrated PAR measurements<\/li><li>Compatible with the HOBOnet Analog Mote that transmits data automatically to <a href=\"\/products?f%5B0%5D=product_series%3A1766\" target=\"_blank\">cellular RX stations<\/a> and <a href=\"\/node\/15531\" target=\"_blank\" data-entity-type=\"node\" data-entity-uuid=\"7079a80e-e3c0-4257-b212-3ffc9d4632b8\" data-entity-substitution=\"canonical\">LI-COR Cloud remote monitoring platform<\/a>.<\/li><\/ul><h3>How does the line quantum sensor work?<\/h3><p>The LI-191R uses a 1-meter long quartz rod under a diffuser to direct light to a single filtered silicon photodiode. The entire LI-191R diffuser is sensitive to light over its 1-meter length. Since the diffuser is one continuous piece, the LI-191R essentially integrates an infinite number of points over its surface into a single value that represents light from the entire 1-meter length. Optical filters block radiation with wavelengths beyond 700 nm, which is critical for under-canopy measurements, where the ratio of infrared to visible light may be high. The unique design of the LI-191R provides an excellent quantum response that is close to the ideal quantum response.<\/p><p> <\/p>","applications":["Environmental Research & Protection","Climate","Green Space","Ecology","Agricultural Monitoring","Agricultural Research","Crop Production","Orchard & Vineyard"],"brand":"HOBO","country":"US","environment":["Outdoor"],"important_information":"This sensor requires a Millivolt adapter and HOBOnet Analog Mote for connection to the RX3000 remote monitoring station., basic_html","measurement":["PAR "],"message_boxes":"290656, 2009351","not_a_sku":"0","page_type":"add-to-cart","parcel_status":"restrict_zonos","primary_measurement":"Light","features":"product_features_icons","product_information_tab":"290661, 2009366","specifications":[{"type":"Product Specifications","revision_default":"1","field_hide_in_compare":"0","field_hide_on_specs_tab":"0","field_specification_group_label":"BLANK","field_specification_items":[{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Absolute Calibration","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"\u00b1 10% traceable to National Institute of Science and Technology (NIST). The LI-191 is calibrated via transfer calibration using a reference LI-190R Quantum Sensor. Transfer error is \u00b1 5% (included in the \u00b1 10%)"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Sensitivity","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"Typically 7 \u03bcA per 1,000 \u03bcmol s-1 m-2"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Linearity","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"Maximum deviation of 1% up to 10,000 \u03bcmol s-1 m-2"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Response Time","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"10 \u03bcs"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Temperature Dependence","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"\u00b1 0.15% per \u00b0C maximum"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Cosine Correction","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"Acrylic diffuser"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Azimuth","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"< \u00b1 2% error over 360\u00b0 at 45\u00b0 elevation"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Operating Temperature Range","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"\u221240 \u00b0C to 65 \u00b0C"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Relative Humidity Range","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"0% to 95% RH, Non-Condensing"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Sensitivity Variation over Length","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"\u00b1 7% maximum using a 2.54 cm (1\u201d) wide beam from an incandescent light source."}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Sensing Area","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_measurement":[{"type":"Product Specification - Measurement","revision_default":"1","field_spec_imperial_value":"39.4\u201d \u00d7 0.50\u201d","field_spec_metric_value":"1 m \u00d7 12.7 mm"}]}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Detector","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"High stability silicon photovoltaic detector (blue enhanced)"}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Sensor Housing","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_value":"Weatherproof anodized aluminum housing with acrylic diffuser and stainless steel hardware."}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Size (L x W x D)","field_specification_values":[{"type":"Product Specification - Value","revision_default":"1","field_specification_measurement":[{"type":"Product Specification - Measurement","revision_default":"1","field_spec_imperial_value":"47.7\u201d \u00d7 1.0\u201d \u00d7 1.0\u201d","field_spec_metric_value":"121.3 \u00d7 2.54 \u00d7 2.54 cm"}]}]},{"type":"Product Specifications - Item","revision_default":"1","field_specification_label":"Weight","field_specification_values":[{"type":"Product Specification - 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LI-191R
LI-COR LI-191R Line Quantum Sensor
Call for pricing
Used to measure sunlight under a plant canopy where the light field is non-uniform, the LI-191R Line Quantum Sensor measures PAR with a single detector integrating measurements over its 1-meter length. The LI-191R makes it easy to measure under-canopy light in many plots quickly and consistently. It measures light in units of Photosynthetic Photon Flux Density (PPFD), which is expressed as μmol s-1 m-2.
Why choose the LI-191R PAR Light Sensor?
Improved water resistance for long-term outdoor deployment
Integrated measurements using a single detector prevents variance found in sensors that use multiple detectors
Selected by the National Ecological Observatory Network (NEON®) for integrated PAR measurements
The LI-191R uses a 1-meter long quartz rod under a diffuser to direct light to a single filtered silicon photodiode. The entire LI-191R diffuser is sensitive to light over its 1-meter length. Since the diffuser is one continuous piece, the LI-191R essentially integrates an infinite number of points over its surface into a single value that represents light from the entire 1-meter length. Optical filters block radiation with wavelengths beyond 700 nm, which is critical for under-canopy measurements, where the ratio of infrared to visible light may be high. The unique design of the LI-191R provides an excellent quantum response that is close to the ideal quantum response.
