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
$3995.00
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
$3995.00
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
$3995.00
Usually ships in 3-5 days

Related Products

In The News

Army Corps of Engineers Protects River Wildlife

A complex series of locks and dams up and down the Ohio River enable interstate commerce, travel and recreation by maintaining a usable pathway for watercraft, but come with the inevitable byproducts of disrupting the river’s natural systems. To combat this, the U.S. Army Corps of Engineers uses a complex monitoring and response technology designed to minimize the negative impacts of dredging on the river ecosystem. Steven Foster, a limnologist with the Corps Water Quality Team, works at the Robert C. Byrd Lock and Dam in Gallipolis Ferry, West Virginia. He said one key area he focuses on is the welfare of mussels in the river. River dredging can smother mussel beds, so Foster and the team of engineers monitor the beds to ensure their safety.

Read More

Researchers Track Glacial Meltwater On Its Surprising Journey

While the scientific community has formed its consensus on how ice sheets are shrinking in and around Greenland, some researchers are tracking what happens to the meltwater as it drains into the ocean each summer. Their study, published in Nature Geoscience by an interdisciplinary team of biologists, oceanographers and hydrologists, used computer models to simulate the meltwater to see where currents take it and what effect it could have on the ocean. Renato Castelao, one of the researchers and an associate professor of marine science for the University of Georgia, said one of the biggest discoveries of the study was the surprising final destinations of the ice sheets as they melt into the ocean each summer.

Read More

Ice Fishing With A SondeCAM Underwater Fishing Camera

Thinking of hitting the ice with a SondeCAM underwater fishing camera? Due to its rugged design, you won't have to worry about it handling the harsh elements. However there are a few simple tricks to get the most out of a FishSens SondeCAM while ice fishing. You won't have to do anything to modify the SondeCAM itself, but you are going to have to bring a few extra things. Most importantly we are going to need a power source. Unless you are hauling your gear with a truck, you'll want something more portable than the battery you used in the boat. Pick up an inexpensive and maintenance-free 12-volt, 9-amp battery. It is going to provide plenty of power, but will be much lighter and take up less space.

Read More