Campbell PWC100 Manual de usuario
PWC100 Present Weather
Sensor Calibrator
Revision: 3/12
Copyright © 2008-2012
Campbell Scientific, Inc.
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PWC100 Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction..................................................................1
2. Operation and Use.......................................................1
2.1 Operating Guidelines................................................................................1
2.2 Initial Configuration of the PWS100 for use of the Calibrator.................2
3. PWS Calibration...........................................................2
3.1 Installing and Connecting up the Calibrator.............................................3
3.2 Starting the Tests ......................................................................................4
4. Cleaning Guide ..........................................................10
5. Calibrator Safety Guidelines.....................................10
6. Electrical Parameters................................................11
6.1 PWC100 Voltages and Currents.............................................................11
6.2 Earth, 0 V and Transient Protection .......................................................11
Appendix
A. Assembly Guidelines..............................................A-1
A.1 Assembly Guidelines.......................................................................... A-1
A.2 Connector Pin Outs............................................................................. A-2
Figures
2-1. PWS100 calibration disk constants.........................................................2
3-1. The PWS100 enclosure showing the LEMO connector used by the
calibrator ..............................................................................................3
A-1. Attaching the velocity disk................................................................ A-1
A-2. Attaching the visibility disk............................................................... A-1
A-3. Attachment of the velocity calibrator................................................ A-2
i
PWC100 Present Weather Sensor
Calibrator
1. Introduction
The PWC100 is a customer field calibration validation device for the PWS100.
The PWC100 calibrator system simulates particle and visibility data for the
PWS100 allowing verification of the calibration constants held within the
system.
The following features are checked by the calibrator:
•Particle velocity
•Particle size detection
•Laser beam uniformity
•Visibility range
•Component aging
The PWC100 will give a go/no go indication of the PWS100 calibration to
show whether the instrument is within normal operating limits. If required, the
PWC100 can be used to partially recalibrate the PWS100. That method is not
described in this manual. Please contact Campbell Scientific for more details
or refer to the PWS100 manual.
2. Operation and Use
2.1 Operating Guidelines
Please ensure that there are no obstructions between the PWS sensor heads
before the tests are started.
Ambient temperature should be 20°C ± 10°C.
The test should not be performed in the following conditions:
•Do not perform the calibration when it is raining or during any other
precipitation event, such as snow, hail or drizzle.
•Do not perform the calibration when the local visibility is below
approximately 10,000 meters.
•Do not perform the calibration if there is a strong wind that could blow
debris into the sensing volume of the PWS.
The PWC100 is not suitable for long term outdoor use and is only designed to
be exposed for the duration of the calibration test. Long term exposure to
outdoor environmental conditions may cause damage to the unit.
1
PWC100 Present Weather Sensor Calibrator
Care must be taken not to drop or scratch either the velocity or visibility units
as this may cause errors that could result in tests failing when they shouldn’t.
2.2 Initial Configuration of the PWS100 for use of the Calibrator
The visibility calibration disks provided as part of the calibration kit are
individually calibrated and have a number printed on them to indicate the
measured signal in a reference instrument. Each PWS100 that is to be used
with the calibrator has to have that value entered into its configuration so that it
is referenced to the properties of that disk. Once set, the PWS100 will retain
the calibrator disk information unless the sensor is reset to its factory defaults.
The test procedure outlined in the rest of the manual can then be followed
repeatedly without changing the settings in the sensors.
For information on how to set calibration disk constants, please refer to Section
7.4.3 of the PWS100 manual. Figure 2-1 provides the screen in which the
values are shown. Please note you only need to change the constants; do not
attempt to adjust the calibration of the PWS100 if carrying out the standard test
procedure.
FIGURE 2-1. PWS100 calibration disk constants
For normal operation it is only necessary to set the visibility constant, as
printed on the disk. It is also useful to set the calibrator serial number for
reference purposes. The velocity and size constants can be left at the factory
defaults of 5.000 and 2.386 as these are fixed values for a standard calibrator.
3. PWS Calibration
The calibration check procedure can be broken up into two separate sections.
The first section comprises of visibility tests and the second velocity tests. If
only a visibility test is required, then the tests can be finished after the first
stage and the velocity tests need not be run.
It may be desirable to carry out a check of the sensor before and after cleaning
the sensor’s lenses to determine if the previous readings of the sensor were
adversely affected by dirt. This would be at the customer’s discretion.
2
PWC100 Present Weather Sensor Calibrator
3.1 Installing and Connecting up the Calibrator
•Remove the existing plastic blanking screws from their positions on the
PWS center block.
•Fix the PWC100 visibility calibrator unit to the center position on the
PWS using two of the metal countersunk fixing screws provided.
(Connector for the calibrator)
FIGURE 3-1. The PWS100 enclosure showing the LEMO connector
used by the calibrator
3
PWC100 Present Weather Sensor Calibrator
3.2 Starting the Tests
All PWC100 tests can be performed without the need to access the PWS with a
PC. Only once the tests are finished and if changes to the calibration constants
are needed, will a PC be required to change the system configuration.
If at any point the LEDs behave unexpectedly, check the status table at the end
of this section.
Step 1: Performing the visibility calibration
•Check that the PWC100 visibility calibrator unit is located correctly and
securely (refer to Appendix A for additional details).
•Connect the LEMO connector coming from the velocity unit to the LEMO
socket on the PWS (as detailed in Section 3.1). This will let the PWS
know you want to start the tests. Press the RESET/STOP button on the
PWC100. Within 10 seconds, all three LEDs should light up for
approximately 3 seconds. This indicates that the calibration unit has been
detected correctly by the PWS100 and that the LEDs are functioning
correctly.
•LED Land Rshould now be flashing slowly and all other LEDs should be
off.
•Once you are ready, press START.
•The test is now automated. LED Land Rwill stay illuminated until this
stage of the test is complete. This test will take approximately two
minutes.
•Upon successful completion of the test, LED Land LED Cwill be flashing
slowly, indicating that the next test is ready to be started.
4
Tabla de contenidos
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