AccuPAR model LP-80 Ceptometer from Meter Group
Measure Canopy PAR and Calculate LAI
The AccuPAR model LP-80 is a lightweight, portable, linear photosynthetically active radiation (PAR) sensor. It lets you measure canopy PAR interception and calculate leaf area index (LAI) at any location within a plant or forest canopy. PAR data can be used with other climate data to estimate biomass production without destroying the crop. PAR is also important in determining other canopy processes; such as radiation interception, energy conversion, momentum, gas exchange, precipitation interception, and evapotranspiration.
The AccuPAR also uses radiation measurements and other parameters to accurately calculate leaf area index (LAI) non-destructively in real time, in the field.
Lightweight, Self-contained
The AccuPAR weighs a little over 1 pound ( 0.5kg). The attached controller, powered by four AA batteries, can be used to take measurements manually or can log data unattended for short periods of time. It stores 1 MB of data (over 2,000 readings) for later download and analysis.
Includes External Sensor
The included external PAR sensor can be used to make simultaneous above- and below-canopy PAR measurements. Using both the external sensor and the AccuPAR together allows you to get accurate PAR and LAI data in clear, partly cloudy, or overcast sky conditions.
| DATA STORAGE CAPACITY | 1 MB RAM (over 2,000 measurements) |
| NUMBER OF SENSORS | 80 |
| PAR RANGE | 0 to > 2,500 μmol m-2s-1 |
| RESOLUTION | 1 μmol m-2s-1 |
| PROBE LENGTH | 84 cm |
| OVERALL LENGTH | 99 cm (40 in) |
| UNATTENDED LOGGING INTERVAL | User selectable, between 1 and 60 min |
| INSTRUMENT WEIGHT | 0.56 kg (1.23 lbs) |
| DATA RETRIEVAL | Direct via RS-232 |
| KEYPAD | 7 key, menu-driven |
| OPERATING ENVIRONMENT | 0-50°C (32-122°F), 0-100% relative humidity |
| EXTERNAL PAR SENSOR CABLE LENGTH | 5 meters |
| INTERFACE CABLE | RS-232 cable |
| POWER | Four AAA Alkaline cells |
| MINIMUM SPATIAL RESOLUTION | 1 cm |