Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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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.
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
| 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 |
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