LI-191R-BNC-2

LI-COR LI-191R Line PAR Sensors

LI-COR LI-191R Line PAR Sensors

Description

The LI-COR LI-191R Line PAR Sensor measures photosynthetically active radiation (PAR) over its one meter length for use within a plant canopy.

Features

  • Spatially averages PPFD over its 1m length
  • Uses a 1m quartz rod under a diffuser to conduct light to a single Quantum sensor
  • Improved water resistance for long-term outdoor deployment
Free Shipping on this product
List Price
$$$$$
Your Price
Check Price

Usually ships in 3-5 days
Shipping Information
Return Policy
Why Buy From Fondriest?

Details

The LI-191R Line Quantum Sensor measures Photosynthetically Active Radiation (PAR) integrated over its 1-meter length. It is used to measure sunlight under a plant canopy, where the light field is non-uniform. It measures light in units of Photosynthetic Photon Flux Density (PPFD), which is expressed as μmol s-1 m-2.

A non-uniform light field under a plant canopy is difficult to characterize with a single sensor or multiple sensors arranged in a line because the light field can vary considerably from point to point and over a line.

To solve this problem, 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.

Sensors that use multiple photodiodes potentially induce large uncertainty in measurements because each photodiode can drift independently of the others. The diffuser and single photodiode in the LI‑191R provide stable, integrated measurements that are superior to averages provided by many linear sensors.

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.

Notable Specifications:
  • Absolute Calibration: ± 10% traceable to National Institute of Science and Technology (NIST). The LI-191 is calibrated via transfer calibration
  • Sensitivity: Typically 7 μA per 1,000 μmol s-1 m-2
  • Linearity: Maximum deviation of 1% up to 10,000 μmol s-1 m-2
  • Response Time: 10 μs
  • Temperature Dependence: ± 0.15% per °C maximum
  • Cosine Correction: Acrylic diffuser
  • Azimuth: < ± 2% error over 360° at 45° elevation
  • Sensitivity Variation over Length: ± 7% maximum using a 2.54 cm (1”) wide beam from an incandescent light source.
  • Sensing Area: 1 m × 12.7 mm (39.4” × 0.50”)
  • Detector: High stability silicon photovoltaic detector (blue enhanced)
  • Sensor Housing: Weatherproof anodized aluminum housing with acrylic diffuser and stainless steel hardware.
  • Size: 121.3 L × 2.54 W × 2.54 cm D (47.7” × 1.0” × 1.0”)
  • Weight: 1.4 kg (3.0 lbs.)
  • Cable Length: 2 m, 5 m (6.5', 16.4')
What's Included:
  • (1) LI-191R Line PAR Sensor
  • (1) Bubble level
  • (1) Detachable 10 ft. cable
  • (1) Hard-sided carrying case
Image Part # Product Description Price Stock Order
LI-COR LI-191R Line PAR Sensors LI-191R-BNC-2 Line Quantum sensor with microamp output, 2m cable with BNC connector Usually ships in 3-5 days
LI-COR LI-191R Line PAR Sensors LI-191R-BNC-5 Line Quantum sensor with microamp output, 5m cable with BNC connector
Usually ships in 3-5 days
LI-COR LI-191R Line PAR Sensors LI-191R-SMV-2 Line Quantum sensor with standardized mV output, 2m cable with bare leads
Usually ships in 3-5 days
LI-COR LI-191R Line PAR Sensors LI-191R-SMV-5 Line Quantum sensor with standardized mV output, 5m cable with bare leads
Usually ships in 3-5 days
Image Part # Product Description Price Stock Order
LI-COR Sensor Extension Cables 2222SB Extension cable, for use with type BNC or SMV terrestrial light sensors, 15m Usually ships in 3-5 days
LI-COR Sensor Extension Cables 2222SB-100 Extension cable, for use with type BNC or SMV terrestrial light sensors, 30m Usually ships in 3-5 days
LI-COR BNC to Bare Lead Adapter 2200 BNC to bare lead adapter, converts BNC type sensors to BL type sensors In Stock
LI-COR Sensor Millivolt Adapters 2290 Sensor millivolt adapter (604 Ohm resistor), for use with LI-190R-BNC, LI-191R-BNC & LI-210R-BNC sensors Usually ships in 3-5 days
LI-COR 2420 Light Sensor Amplifier 2420-BNC Light sensor amplifier, BNC connector Usually ships in 3-5 days
LI-COR LI-250A Light Meter LI-250A Light meter In Stock
LI-COR LI-1500 Light Sensor Logger LI-1500 Light sensor logger Usually ships in 3-5 days
LI-COR LI-1500 Light Sensor Logger LI-1500G Light sensor logger with GPS Usually ships in 3-5 days
NexSens iSIC-MAST Data Logging System iSIC-MAST Mast-mounted iSIC data logging system with solar charging kit
$2795.00
Usually ships in 3-5 days
NexSens MAST Wireless Telemetry Systems 3100-MAST Mast-mounted 3100-iSIC data logging system with cellular modem telemetry & solar charging kit Usually ships in 3-5 days
NexSens MAST Wireless Telemetry Systems 4100-MAST Mast-mounted 4100-iSIC data logging system with spread spectrum radio telemetry & solar charging kit Usually ships in 3-5 days
NexSens MAST Wireless Telemetry Systems 6100-MAST Mast-mounted 6100-iSIC data logging system with Iridium satellite telemetry & solar charging kit Usually ships in 3-5 days

Related Products

In The News

Algae Bloom Spawns New Water Monitoring Program In Utah Lake

The result of a harmful algae bloom in the summer of 2016, the enhanced Utah Lake water quality monitoring program, reached its one year milestone in September. Located near the Provo and Orem metropolitan areas, the lake is Utah’s largest freshwater body and a popular water recreation and fishing spot. In the summer of 2016, recreation users reported an unusual amount of scum on the surface of the water. Utah Lake is monitored by the Utah Division of Water Quality (UDWQ). Prior to the 2016 harmful algae bloom (HAB), the UDWQ successfully used regular water sample testing and citizen reporting to stay on top of any incidents.

Read More

Data Buoys Study Turbid Water Environments in Lake Erie Basin

What started as a study into a relatively unexamined type of cyanobacteria has turned biologists from Bowling Green State University into an integral part of the effort to monitor and protect the drinking water in Sandusky, Ohio. Dr. George Bullerjahn, the Professor of Research Excellence at Bowling Green State University, has done considerable work in the study of beneficial cyanobacterial organisms in the eastern and central basins of Lake Erie. His current project is focused on the growth of the toxic cyanobacterium Planktothrix in Sandusky Bay. Over the course of his career Bullerjahn has collaborated with Dr. Steven Wilhelm from the University of Tennessee.

Read More

Bottom Composition Matters, Underwater Cameras Can Help

As a pro angler, I use my Lowrance electronics every single time I am on the water. They are great at locating fish and structure, but when combined with my FishSens SondeCAM HD Underwater Camera they can show everything. A camera is a great tool for someone who wants to better understand what they are seeing on their electronics and for me, it helps get a clear picture of one of the most important things in bass fishing: bottom composition. Hard Spots Hard bottoms are usually the best, and bass will relate to hard bottoms of different types depending on the region. My Lowrance StructureScan will show hard bottoms as bright, white areas on the screen where softer bottoms will be more grayish.

Read More