Decagon Devices WP4C Manuale utente
WP
4C
Dewpoint PotentiaMeter
Operator’s Manual
Version 1
Decagon Devices, Inc.
2365 NE Hopkins Court
Pullman WA 99163
tel: (509) 332-2756
fax: (509) 332-5158
www.decagon.com
Trademarks
“WP4C PotentiaMeter” is a
registered trademark of Decagon Devices, Inc.
©2010 Decagon Devices, Inc., All rights reserved.
WP
4C
PotentiaMeter
Table of Contents
i
Contents
ContentsContents
Contents
1. Introduction . . . . . . . . . . . . . . . . . .1
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Note to our WP4C Users . . . . . . . . . . . . . . . . . . . . . . . 2
Seller’s Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. About the WP4C . . . . . . . . . . . . . .4
Instrument Specifications . . . . . . . . . . . . . . . . . . . . . . . 4
WP4C and Water Potential . . . . . . . . . . . . . . . . . . . . 5
How the WP4C works . . . . . . . . . . . . . . . . . . . . . . . . . . 5
WP4C and Temperature . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Gettin Started . . . . . . . . . . . . . . .7
Components of your WP4C . . . . . . . . . . . . . . . . . . . . 7
Choosing a Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Preparing the WP4C for Operation . . . . . . . . . . . . 9
Portability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. The Menus . . . . . . . . . . . . . . . . . . .12
The Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Changing Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Reading Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sample Equilibration Screen . . . . . . . . . . . . . . . . . . . . 20
WP
4C
PotentiaMeter
Table of Contents
ii
5. Calibration and Verification . . 21
Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Verification Standards . . . . . . . . . . . . . . . . . . . . . . . . . . 21
When to Verify Calibration . . . . . . . . . . . . . . . . . . . . 22
How to Verify and Calibrate the WP4C . . . . . . . 22
6. Sample Preparation . . . . . . . . . . 25
Choosing a Sample Cup . . . . . . . . . . . . . . . . . . . . . . . . . 25
Preparing the Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Dry Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Samples and Temperature . . . . . . . . . . . . . . . . . . . . . . 27
Measuring Plant Samples . . . . . . . . . . . . . . . . . . . . . . . 29
7. Takin a Readin . . . . . . . . . . . . 30
How WP4C takes Readings . . . . . . . . . . . . . . . . . . . . 1
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
8. Computer Interface . . . . . . . . . . . 33
9. Theory: Water Potential . . . . . . 35
Water Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Measuring Water Potential . . . . . . . . . . . . . . . . . . . . . 5
Effect of Temperature on Water Potential . . . . . 7
Estimating Osmotic Potential . . . . . . . . . . . . . . . . . . . 8
10. Cleanin and Maintenance . . . 39
Tools Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Accessing the Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cleaning Procedure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Checking Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
WP
4C
PotentiaMeter
Table of Contents
iii
11. Repair Instructions . . . . . . . . . . . .45
Shipping Directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Repair Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Loaner Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
12. Troubleshootin . . . . . . . . . . . . .48
Problems and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Sensor Performance Screen . . . . . . . . . . . . . . . . . . . . . 54
13. Further Readin . . . . . . . . . . . . . .56
References: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Appendix A . . . . . . . . . . . . . . . . . . . .58
Preparing Salt Solutions . . . . . . . . . . . . . . . . . . . . . . . . . 58
Index . . . . . . . . . . . . . . . . . . . . . . . . . .61
WP
4C
PotentiaMeter
Table of Contents
iv
WP
4C
PotentiaMeter
1. Introduction
1
1. Introduction
Welcome to Decagon’s WP4C Dewpoint PotentiaMeter,
the research standard for measuring water potential.
WP4C is the fastest, most accurate, and most reliable
instrument available for measuring water potential using
the chilled-mirror dewpoint techni ue. Whether you are a
scientist or a student, WP4C will suit your needs. It is easy
to use and provides fast, accurate results. We hope you
find this manual informative and helpful in understanding
how to maximize the capabilities of your WP4C.
About this Manual
Included in this manual are instructions for setting up
your WP4C, calibration, and maintaining and caring for
your instrument. Please read these instructions before
operating WP4C to ensure that the instrument performs
to its full potential.
Customer Service
If you ever need assistance with your WP4C, or if you just
have uestions, there are several ways to contact us:
NOTE: If you purchased your WP4C through a distributor, please
contact them for assistance
WP
4C
PotentiaMeter
1. Introduction
2
Phone:
Our toll-free customer service number is available to our
customers in the US, Monday through Friday, between 8
a.m. and 5 p.m. Pacific time at 1-800-755-2751. For our
customers outside of the US, our regular telephone num-
ber is (509) 332-2756.
Fax:
Our fax number is (509) 332-5158. When you fax us,
please include your WP4C’s serial number, your name,
address, phone and fax number along with a description
of your problem.
E-mail:
If you need technical support or have uestions about
your application with WP4C, you can send us messages via
e-mail at support@decagon.com. Again, please include
as part of your message your WP4C’s serial number, your
name, address, phone, fax number, and return e-mail
address.
Warranty
WP4C has a 30-day satisfaction guarantee and a one-year
warranty on parts and labor.
Note to our WP4C Users
This manual is written to aid the end user in understand-
ing the basic concepts of water potential, enabling them to
use our instrument with confidence. Every effort has been
WP
4C
PotentiaMeter
1. Introduction
made to ensure that the content of this manual is correct
and scientifically sound.
Seller’s Liability
Seller warrants new e uipment of its own manufacture
against defective workmanship and materials for a period
of one year from date of receipt of e uipment (the results
of ordinary wear and tear, neglect, misuse, accident and
excessive deterioration due to corrosion from any cause
are not to be considered a defect); but Seller’s liability for
defective parts shall in no event exceed the furnishing of
replacement parts F.O.B. the factory where originally man-
ufactured. Material and e uipment covered hereby which
is not manufactured by Seller shall be covered only by the
warranty of its manufacturer. Seller shall not be liable to
Buyer for loss, damage or injuries to persons (including
death), or to property or things of whatsoever kind
(including, but not without limitation, loss of anticipated
profits), occasioned by or arising out of the installation,
operation, use, misuse, nonuse, repair, or replacement of
said material and e uipment, or out of the use of any
method or process for which the same may be employed.
The use of this e uipment constitutes Buyer’s acceptance
of the terms set forth in this warranty. There are no under-
standings, representations, or warranties of any kind,
express, implied, statutory or otherwise (including, but
without limitation, the implied warranties of merchantabil-
ity and fitness for a particular purpose), not expressly set
forth herein.
WP
4C
PotentiaMeter
2. About the WP4C
4
2. About the WP4C
Instrument Specifications
Range: 0 to -300MPa*
ccuracy: ±0.05MPa* from 0 to -5 MPa
1% from -5 to -300 MPa
Measurement time:
~10-15 min. for most soil samples in precise mode
~20 min. for plant tissue samples
<5 minutes in fast mode (reduced accuracy)
Temperature Control: 15 to 40° C (±0.2° C)
Operating Environment: 5 to 40° C (41 to 104° F)
Sensor Type: 1) Chilled-mirror dewpoint sensor
2) Infrared temperature sensor
Sample Cup Capacity: 7 ml recommended (15 ml full)
Dimensions: 24.1 x 22.9 x 8.9 cm (9.5 x 9.0 x 3.5 in)
Weight: 3.2 Kg (7.1 lbs)
Case Material: Powder Painted Aluminum
Display: 20 x 2 alphanumeric LCD with backlighting
Data Communication: RS232A compatible, 8-data bit
ASCII code, 9600 baud, no parity, 1 stop bit
Power: 110VAC to 220 VAC, 50/60 Hz
Interface Cable: Standard RS232 serial cable (included)
Compatible Standards: ASTM D6836-07
Warranty: 1 year parts and labor
* Note that the WP4C (and all vapor pressure instruments) are
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