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Summary of Contents for LI-COR LI-250
- Page 1 LI-250 LI-250 Light Meter Light Meter Instruction Manual ®...
- Page 2 LI-250 Light Meter Instruction Manual Publication Number 9604-114 April, 1996 ® LI-COR, Inc. Environmental Division 4421 Superior Street P.O. Box 4425 Lincoln, Nebraska 68504 Phone: (402) 467-3576 FAX: (402) 467-2819 Toll-free 1-800-447-3576 (U.S. & Canada) e-mail: envsales@env.licor.com Internet: http://www.licor.com...
- Page 3 How to Use this Manual This manual contains operation and maintenance infor- mation for the LI-250 Light Meter. Read the operating instructions before using the LI-250. NOTICE The information contained in this document is subject to change without notice. LI-COR MAKES NO WARRANTY OF ANY KIND WITH...
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Page 4: Table Of Contents
Table of Contents Section 1. Operation Summary 1.1 Configuration vs. Measurement Mode..... 1.2 Making Measurements ..........Section 2. Sensors & Accessories 2.1 Compatible Sensors ..........2.2 Sensor Calibration ............ 10 2.3 Accessories .............. 13 2.4 Power Requirements ..........13 APPENDIX A. Specifications APPENDIX B. -
Page 5: Section 1. Operation Summary
HOLD key or the CAL key is pressed. 1.2 Making Measurements The LI-250 utilizes a 5-key keypad; note that many of the keys have two functions. The active function depends on whether the LI-250 is in Measurement or Configuration mode. - Page 6 Operation Summary Attach the desired sensor. Press and hold the key for about 2 seconds, and then release to turn the instrument on. You will be in measurement mode. Press to enter configuration mode, where you can display or change the calibration multiplier currently in use.
- Page 7 15 second average, which will be displayed in Hold mode. Press the key to resume HOLD measurements. Press the key to turn the power off. The LI-250 will automatically shut off after 25 minutes of inactivity in measurement mode.
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Page 8: Section 2. Sensors & Accessories
(lux). example, it is not possible for a pyranometer to read out in units of lux. If you want to configure the LI-250 to read out in lux, you must use the photometric sensor. LI-COR type 'SB' radiation sensors are also compatible if the Calconnector (Calibration connector) is detached from the BNC connector. -
Page 9: Sensor Calibration
Calconstant. The LI-250 measures the current output of the sensor in units of microamps, and converts the measured current to units of radiation. To make this conversion, the LI-250 uses the sensor Calibration Multiplier. - Page 10 The LI-250 multiplies the current reading in microamps by the multiplier. Since the Calibration Multiplier is unique for each sensor, it must be entered into the LI-250 each time the sensor is changed or recalibrated. NOTE: Always enter the Calibration Multiplier, not the Calconstant.
- Page 11 LI-COR by providing the serial number of the sensor. Converting Calconstants to Multipliers For LI-COR sensors that are not type 'SA' (i.e., type 'SB', etc.), the calibration multiplier must be calculated from the calibration constant given on the certificate of calibration.
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Page 12: Accessories
The following accessories and sensors are available for the LI-250. Contact LI-COR for current information. 250-01 Carrying Case - A soft-sided case for the LI-250 and terrestrial type radiation sensors. Size: 20.3 cm L × 10.2 cm W × 9 cm D (8" × 4" × 3.5"). Weight: 98 g (0.216 lbs). -
Page 13: Power Requirements
The battery compartment is accessed through a slide-out panel on the back of the instrument case. Although typical battery life is more than 150 hours of continuous operation, it is dependent upon the storage tem- perature. Do not store the LI-250 at high temperatures. -
Page 14: Appendix A. Specifications
Appendix A. Specifications 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). - Page 15 20 hours battery life remaining. Size: 14 L × 7.7 W × 3.8 cm D (5.5" × 3" × 1.5"). Weight: 0.26 kg (0.57 lbs). Sensors: Any LI-COR sensor with BNC connector; Quantum, Pyranometer, or Photometric. Warranty: 1 year parts and labor.
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Page 16: Appendix B. Conversion Table
Appendix B. Conversion Table Type of Instantaneous Measurements Measurement 1.0 µm s = 1 µE s Quantum = 6.022 • 10 photons s = 6.022 • 10 quanta s = 6.022 • 10 cm - quanta s = 1.433 • 10 Radiometric 1 W m cal cm... - Page 17 5. No-charge repair parts may be sent at LI-COR, inc.'s sole discretion to the purchaser for installation by purchaser. 6. LI-COR, inc.'s liability is limited to repair or replace any part of the instrument without charge if LI-COR, inc.'s examination...
- Page 18 Other than the obligation of LI-COR, inc. expressly set forth herein, LI-COR, inc. disclaims all warranties of merchantability or fitness for a particular purpose. The foregoing constitutes LI-COR, inc.'s sole obligation and...
- Page 19 DISTRIBUTOR or the DISTRIBUTOR'S customers may ship the instruments directly to LI-COR if they are unable to repair the instrument themselves even though the DISTRIBUTOR has been approved for making such repairs and has agreed with the customer to make such repairs as covered by this limited warranty.
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