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LI-250A Light Meter

Updated:2025-03-13

Brand: LI-COR
Model: LI-250A
Description: The LI-250A is a portable meter that displays the output from any LI-COR light sensor that has a cable terminated with a BNC connector. It shows instantaneous values or 15-second averages of values fr
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Product Details

LI-250A Light Meter Description：

Product Manual

The LI-250A is a portable meter that displays the output from any LI-COR light sensor that has a cable terminated with a BNC connector. It shows instantaneous values or 15-second averages of values from a sensor.

The LI-250A automatically selects a sensitivity range to optimize accuracy and resolution for a given sensor. It provides a wide dynamic range for high-resolution measurements, even in low-light conditions.

Features

15-second averaging is turned on or off by pressing a single button

Over 150 hours of operation from a single 9-volt battery

Automatic shut-off after 20 minutes of inactivity

O-ring sealed case for weather protection

Easy-to-enter calibration multipliers make it simple to change between sensors

Compatible with the LI-190R, LI-191R, LI-192, LI-193, LI-200R, or LI-210R

LI-250A Light Meter Specification：

Accuracy	25 °C: Typically ± 0.4% of reading ± 3 counts on the least significant digit displayed (all ranges). 0 - 55 °C: Typically ± 0.6% of reading ± 3 counts on the least significant digit displayed (all ranges).
Range Selection	Autoranging (3 ranges).
Linearity	±0.05%
Sensors	Designed for type "SA" sensors; type "SB" and "SL" sensors with BNC connectors are also compatible when calconnector or millivolt adapter are removed.
Sensor Calibration	Each sensor is supplied with a calibration multiplier. Calibration multipliers for two sensors can be stored in memory. Calibration multipliers are entered from the keypad.。
Signal Averaging	Sensor output can be collected and displayed as a 15-second average (approximately 60 readings). Averages are retained on the display in HOLD mode.
Display	LCD display. Updated every 0.5 seconds in Instantaneous mode.
Battery Life	150 hours typical with continuous operation.
Power Requirement	One 9V Alkaline battery.
Operating Conditions	0 to 55 °C, 0 to 95% RH (non-condensing).
Storage Conditions	-55 to 60 °C, 0 to 95% RH (non-condensing).
Size	14 cm × 7.7 cm × 3.8 cm (5.5" × 3" x1.5").
Weight	0.26 kg (0.57 lbs).
Warranty	1 year parts and labor.

LI-250A Range and Resolution
Sensor	Range	Resolution
Quantum	0-199 μmol·s ^-1 m ^-2 0-1999 0-19999	0.01 μmol·s ^-1 m ^-2 0.1 1
Pyranometer	0-19 W·m ^-2 0-199 0-1999	0.001W·m ^-2 0.01 0.1
Photometric	0-1999 lux 0-19999 lux 0-199 klux	0.1 lux 1 0.01 klux