LI-COR LI-610 Service manual

LI-610
Portable Dew Point Generator
Instruction
Manual
®

LI-610
Portable Dew Point Generator
Operating and
Service Manual

ii
NOTICE
The information contained in this document is subject to change without notice.
LI-COR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT
NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. LI-COR shall not be liable for errors contained herein or for incidental or consequential
damages in connection with the furnishing, performance, or use of this material.
This document contains proprietary information which is protected by copyright. All rights are reserved. No part of
this document may be photocopied, reproduced, or translated to another language without prior written consent of
LI-COR, Inc.
© Copyright 1991, LI-COR, Inc.
Printing History
New editions of this manual will incorporate all material since the previous editions. Update packages may be used
between editions which contain replacement and additional pages to be merged into the manual by the user.
The manual printing date indicates its current edition. The printing date changes when a new edition is printed. (Minor
corrections and updates which are incorporated at reprint do not cause the date to change).
1st Printing - August, 1991
2nd Printing - November, 2004
Publication Number 984-06659
August, 1991
LI-COR, Inc. • 4421 Superior Street • Lincoln, Nebraska 68504 • 402-467-3576
FAX: [phone]
Toll-free 1-800-447-3576 (U.S. & Canada)
E-mail: [email protected]
www.licor.com

iii
TABLE OF CONTENTS
Section I. UNPACKING AND INITIAL INSPECTION
What's What............................................................................................................................................ 1-1
Optional Accessories .............................................................................................................................. 1-2
Section II. PRE-OPERATION
Set-up ...................................................................................................................................................... 2-1
Filling the Radiator.......................................................................................................................... 2-1
Filling the Condenser Block ............................................................................................................ 2-3
Power On ................................................................................................................................................ 2-4
Section III. OPERATION
General Description ................................................................................................................................ 3-1
Air Flow Through the LI-610.......................................................................................................... 3-1
Water Flow In the LI-610................................................................................................................ 3-2
Operation ................................................................................................................................................ 3-3
Command Input ...................................................................................................................................... 3-4
Analog Output ........................................................................................................................................ 3-4
Theory of Operation................................................................................................................................ 3-5
Ideal Gas Laws ................................................................................................................................ 3-5
Pure Water Vapor ............................................................................................................................ 3-6
Moist Air.......................................................................................................................................... 3-7
Pressure Effects ............................................................................................................................... 3-8
Temperature Effects ........................................................................................................................ 3-10
Relative Humidity............................................................................................................................ 3-10
Sample Calculations ........................................................................................................................ 3-11
Additional Relationships ................................................................................................................. 3-13

iv
Water Sorption................................................................................................................................. 3-13
Maximum Flow Rates...................................................................................................................... 3-13
Using the 610-03 Digital Pressure Meter................................................................................................ 3-16
Connecting the LI-610 and 610-03 to the LI-6200 RS-232C Port.......................................................... 3-18
References............................................................................................................................................... 3-20
Section IV. CALIBRATING LI-COR INSTRUMENTS
General Information ................................................................................................................................ 4-1
Calibrating the LI-6400 H2O Analyzer................................................................................................... 4-1
Setting the H2O Span....................................................................................................................... 4-1
Calibrating the LI-7000 CO2/H2O Infrared Gas Analyzer...................................................................... 4-4
Preliminary....................................................................................................................................... 4-4
Calibration Instructions.................................................................................................................... 4-6
I. Reference (Cell A) is Known and Constant ................................................................................ 4-7
II. Reference (Cell A) is Known, but not Constant......................................................................... 4-7
III. Calibrating for REM Operations............................................................................................... 4-8
User Calibration Example................................................................................................................ 4-10
Calibrating the LI-7500 CO2/H2O Infrared Gas Analyzer...................................................................... 4-12
Preliminary....................................................................................................................................... 4-12
Zero CO2.......................................................................................................................................... 4-14
Zero H2O.......................................................................................................................................... 4-14
Span CO2.......................................................................................................................................... 4-14
Span H2O......................................................................................................................................... 4-15
Calibrating the LI-840 CO2/H2O Infrared Gas Analyzer........................................................................ 4-16
Calibrating the LI-COR LI-6262 CO2/H2O Infrared Gas Analyzer ....................................................... 4-17
Preliminary....................................................................................................................................... 4-17
Absolute Mode H2O Zero Calibration............................................................................................. 4-18
Absolute Mode H2O Span Calibration ............................................................................................ 4-18
Differential Mode H2O Zero Calibration......................................................................................... 4-19
Precautions....................................................................................................................................... 4-19
Calibrating the LI-COR LI-1600 Steady State Porometer RH Sensor.................................................... 4-20
Initial Set-up..................................................................................................................................... 4-20
Calibration: Setting the Zero............................................................................................................ 4-21
Calibration: Setting the Span ........................................................................................................... 4-22
Check Intermediate Values .............................................................................................................. 4-23
Calibrating the LI-COR LI-6200 or LI-6000 Portable Photosynthesis System RH Sensor.................... 4-24
Precalibration ................................................................................................................................... 4-24
Calibration: Setting the Zero............................................................................................................ 4-26
Calibration: Setting the Span ........................................................................................................... 4-27

v
Check Intermediate Values.............................................................................................................. 4-28
Calibrating Relative Humidity Sensors (General) .................................................................................. 4-29
Calibrating Dew Point Hygrometers (General) ...................................................................................... 4-29
References............................................................................................................................................... 4-29
Section V. MAINTENANCE
Draining the LI-610 ................................................................................................................................ 5-1
Condenser Block.............................................................................................................................. 5-1
Radiator Assembly .......................................................................................................................... 5-2
Internal Air Filter .................................................................................................................................... 5-2
Internal Water Filter Screen.................................................................................................................... 5-3
External Fan Filter .................................................................................................................................. 5-4
Cleaning the Condenser Block................................................................................................................ 5-4
Fuses ....................................................................................................................................................... 5-5
Replacing the Air Pump Diaphragm....................................................................................................... 5-5
Recharging the 6200B Battery................................................................................................................ 5-7
Section VI. TROUBLESHOOTING
Appendix A. Specifications
Appendix B. Saturation Vapor Pressure Table
Appendix C. Psychrometric Charts
Appendix D. LI-610 Calibration Traceability
Warranty

Unpacking and Initial Inspection 1-1
Section I. Unpacking & Initial Inspection
What's What
Check the packing list included with your LI-610 to verify that you have
received everything that was ordered, and that you have also received the
following items:
Spare Parts Kit This bag contains replacement parts for your LI-610. As you become
familiar with the Dew Point Generator you will learn which items to
keep close at hand, and which items can be stored away.
Squeeze Bottle A 250 ml plastic squeeze bottle is included to aid in filling the radiator
assembly.
Syringe A plastic syringe is included to facilitate filling and draining of the
condenser block in the LI-610. Refer to Sections 2 and 5, respectively,
for complete filling and draining instructions.
Algicide A small bottle of liquid algicide is included, to prevent the formation of
algae in the radiator assembly of the LI-610. Refer to Section 2 for
complete instructions.
610-04 BNC millivolt
Leads
One set of millivolt leads terminated with a BNC connector is included
for connection to either the "Analog Output" or "Command Input"
fittings on the LI-610 front panel. See Section 3 for a complete
description of the function of these connectors.
610-01 AC Module 108-126/216-252 VAC, 48-66 Hz, for AC operation.

Section 1
1-2 Unpacking & Initial Inspection
Optional Accessories
Several optional accessories are available for use with the LI-610,
including:
610-02 Relative Humidity Calibration Accessories - for calibrating the
LI-6200 or LI-6000 Portable Photosynthesis System relative humidity
sensors, and the LI-1600 Steady State Porometer relative humidity sensor.
610-04 BNC mV Leads - for connecting to either the "Analog Output" or
"Command Input" fittings on the LI-610 front panel (one set included
with the LI-610). One set is included; a second set is required if you wish
to use the Analog Output and Command Input functions simultaneously.
6200B Rechargeable Battery (10.5 - 16 VDC). The 6200B Recharge-
able Battery is tested and fully charged before it leaves the factory, but
may discharge during shipping. It is a good idea to test your battery to
make sure that it is charged. If the battery is below 12 volts, it should be
charged before use. Refer to Section 5 for charging instructions. The
6200B requires the LI-6020 Battery Charger for recharging.
Never store batteries in a discharged state. Charge stored batteries
every three months.
LI-6020 Battery Charger (92-138/184-276 VAC, 47 to 63 Hz).
Battery Leads - for connection to a user-supplied battery (10.5-16VDC)
or other DC power supply.

Pre-Operation 2-1
Section II. Pre-Operation
Set-Up Two distinct systems must be filled with distilled (or deionized) water
before operating; the radiator assembly, located within the LI-610 case,
and the condenser block assembly, located externally.
Filling the Radiator To fill the radiator assembly, remove the black radiator fill cap on the top
of the LI-610 instrument case (Figure 2-1). The cap is not threaded, and
can be pulled straight up.
•Use the plastic squeeze bottle included with the LI-610 to add distilled
or deionized water to the radiator reservoir, until the water level is
visible in the fill tube.
•Connect the LI-610 to your power source (AC or battery).
•Turn the power switch ON. Turn the COOLER switch ON moment-
arily to flow water through the water pump and radiator assemblies.
Shut the LI-610 off and continue to fill the reservoir in this manner
until the water level remains visible in the fill tube. The radiator
assembly requires approximately 200 ml of water to completely fill to
this level.
☞TO PREVENT PERSONAL INJURY, DISCONNECT THE LI-610
FROM AC POWER WHEN FILLING THE RADIATOR
ASSEMBLY.
At this time, add 15-20 drops (2 ml) of algicide (included with the
LI-610) to the radiator reservoir. Replace the radiator fill cap.
If you plan to store the LI-610 in freezing conditions, drain the radiator
and condenser block assemblies completely. To operate the LI-610 in
freezing conditions, fill the radiator assembly (not the condenser) with a
mixture of ethylene glycol (one formulation of which is commonly called

Section 2
2-2 Pre-Operation
“antifreeze”). A 50/50 mixture of ethylene glycol/water will protect the
radiator from freezing to approximately -40 °C.
☞Ethylene glycol is the recommended antifreeze; do not use propylene
glycol or other antifreeze mixtures.
Radiator
Fill
Figure 2-1. LI-610 top view, showing location of radiator fill cap.