LI-COR LI-250A Instruction Manual
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LI-COR LI-250A Instruction Manual

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Summary of Contents for LI-COR LI-250A

  • Page 1 LI-250A LI-250A Light Meter Light Meter Instruction Manual ®...
  • Page 2 CE Marking The LI-250A is a CE-marked product. For conformity information, contact LI-COR Support at http://www.licor.com/envsupport. Outside of the U.S., contact your local sales office or distributor. LI-1500/LI-1500G / LI-250A LI-1500/LI-1500G Light Sensor Logger/LI-250A Light Meter Part Name Toxic and Hazardous Substances or Elements...
  • Page 3 LI-250A Light Meter Instruction Manual Publication Number 984-07507 March, 2004 ® LI-COR, Inc. Environmental 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) envsales@licor.com www.licor.com...

  • Page 4: How To Use This Manual

    How to Use this Manual This manual contains operation and maintenance infor- mation for the LI-250A Light Meter. Read the operating instructions before using the LI-250A. NOTICE The information contained in this document is subject to change without notice. LI-COR MAKES NO WARRANTY OF ANY KIND WITH...

  • Page 5: 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 6: Section 1. Operation Summary

    HOLD key or the CAL key is pressed. 1.2 Making Measurements The LI-250A utilizes a 5-key keypad; note that many of the keys have two functions. The active function depends on whether the LI-250A is in Measurement or Configuration mode.
  • Page 7 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 8 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-250A will automatically shut off after 25 minutes of inactivity in measurement mode.
  • Page 9 Operation Summary Precaution The LI-250A is environmentally sealed. However, please use appropriate precautions to protect the meter from immersion or prolonged contact with water, especially in marine environments. Water damage is not covered under the LI-250A warranty.

  • Page 10: Section 2. Sensors & Accessories

    Calconnector (Calibration connector) is detached from the BNC connector. LI-COR type 'SZ' radiation sensors are not compatible with the LI-250A; they may, however, be fitted with a BNC con- nector. Contact LI-COR for further information. Recalibration of all LI-COR radiation sensors is rec- ommended every two years.

  • Page 11: Sensor Calibration

    Calconstant. The LI-250A 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-250A uses the sensor Calibration Multiplier.
  • Page 12 Sensors & Accessories Since the Calibration Multiplier is unique for each sensor, it must be entered into the LI-250A each time the sensor is changed or recalibrated. NOTE: Always enter the Calibration Multiplier, not the Calconstant. If the Calconstant is entered any data collected will be erroneous.
  • Page 13 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.

  • Page 14: Accessories

    The following accessories and sensors are available for the LI-250A. Contact LI-COR for current information. 250-01 Carrying Case - A soft-sided case for the LI-250A 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 15: Power Requirements

    Insert the new battery by pushing straight down on the battery; do not try to insert at an angle. 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-250A at high temperatures.

  • Page 16: 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 17 20 hours battery life remaining. Size: 15 L × 8.2 W × 3.3 cm D (5.9" × 3.2" × 1.3"). 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.

  • Page 18: 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 cm - = 6.022 • 10 quanta s = 1.433 • 10 Radiometric 1 W m cal cm...
  • Page 20 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 21 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 22 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.
  • Page 23 ® LI-COR, inc. Environmental 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) envsales@licor.com www.licor.com...

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