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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-22
a
T
e
108 1
100Pa
2016
.exp ,
(5)
where the air temperature T is measured in K, and the vapor pressure e is (as suggested in equation (6))
measured in Pa. The ratio [e(T)/100Pa] is equal to the vapor pressure measured in millibars.
Modified Psychrometer Constant And Resistances
The resistances to transfer of sensible heat and water vapor appear in the calculation of the modified
psychrometer constant
*, in addition to the direct appearance of the resistance to heat transfer r
H
. The
modified psychrometer constant is given by:
*,
rr
r
cp
rr
r
Vc
H
p
Vc
H
(6)
where the newly introduced symbols are:
the psychrometer constant, defined in equation (7)
r
V
air resistance to transfer of water vapor
r
c
canopy resistance to transfer of water vapor
r
H
air resistance to transfer of sensible heat
c
p
specific heat capacity of air at constant pressure
p air pressure
latent heat of vaporization of water
ratio of the molecular weights of air and water
This section discusses only the various resistances. The evaluation of the various terms making up the
psychrometer constant
is defined in the next section.
In practice, the resistances of the air to transfer of water vapor and sensible heat are sufficiently similar
that they can be replaced by a single quantity, the air resistance:
rrr
aV
C
.
(7)
This is found from the measured wind speed at height z, u(z), and the height of the plant canopy, h
c
. for
calculations of potential evapotranspiration, a reference crop height of h
c
= 12 cm is assumed. The air
resistance is:
r
zd
z
zd
z
kuz
a
mh
ln ln ,
00
2
1
(8)
with the roughness scales for momentum and heat transfer, z
0m
and z
0h
, and the zero plane displacement d,
given by:
z
h
zh
dh
mc
hc
c
0
0
0123
00123
067
.;
.;
..
(9)
The von Karman constant k is equal to 0.41.
- P/N: 0302116012, Revision C 1
- Table of Contents 3
- Acknowledgements 8
- 1. INTRODUCTION 9
- 1.3. ZENO 10
- -3200 SPECIFICATIONS 10
- 1.3.1. Analog Inputs 10
- 1.3.2. Digital I/O Ports 10
- 1.3.5. ADC Conversion Rates 11
- Refer to Section 12.1.4 12
- 2. ZENO 13
- -3200 BASICS 13
- 2.3. ZENO 16
- -3200 MEMORY 16
- 2.3.1. RAM 17
- 2.3.2. EEPROM 17
- 2.4. THE USER INTERFACE 18
- 2.4.2. Online Help 19
- 32 bit CPU 20
- 3. TUTORIAL: BASIC 21
- -3200 OPERATION 21
- Since many ZENO 22
- Refer to Section 2.2 25
- Refer to Section 2.3.2 27
- Refer to Section 3.1 32
- Refer to Section 8.1 33
- Discussed in Section 3.2.3 34
- Discussed in Section 3.2.4 34
- Discussed in Section 3.2.5 34
- Refer to Section 10.3.6 38
- Refer to Section 2.1 39
- Refer to Section 10.4.1 45
- 10.4.1 46
- Refer to Section 10.4.2 47
- Refer to Section 10.6.4 53
- Refer to Section 10.2 57
- 4. RETRIEVING LOGGED 59
- 4.1. DATA RETRIEVAL OPTIONS 60
- Refer to Section 4.1.1 63
- Kermit file transfer 65
- Refer to Section 10.6.5 67
- CCSAIL protocol 68
- 4.6.2. The ZENO 71
- 5. INTERNAL ZENO 77
- SETTINGS 77
- 5.1. ZENO 78
- -3200 SYSTEM DATE AND TIME 78
- VERSION NUMBER 79
- 5.4. CONTACT INFORMATION 79
- 5.5. ZENO 79
- 5.7. COMPASS SENSOR USAGE 81
- 6. COMMUNICATION 82
- INTERFACES 82
- RS232, RS232H, RS485, RS422 85
- 6.2. DIRECT TERMINAL ACCESS 87
- 6.3. HARDWARE HANDSHAKING 87
- 6.4. TELEPHONE MODEMS 88
- 6.4.1. ZENO 88
- -3200 Modem Configuration 88
- ZENOSOFT 90
- 6.4.2. MODEM SETTINGS 91
- Computer Modem A Modem B 93
- ZENO 3200 93
- PSTN/PBX 93
- 6.4.3. CABLE PIN-OUTS 95
- 6.5. CELLULAR MODEMS 96
- Cellular Modem 98
- Manufacturer 98
- CDPD Sierra Wireless MP200 98
- 6.6. RADIO COMMUNICATIONS 102
- 6.6.5. Push-To-Talk (PTT) 107
- 6.6.6. Response Delay Time 107
- 6.6.7. Data Packetization 108
- 6.7.2. Data Download 109
- 6.7.6. ZENO 114
- -3200 Configuration 114
- GMT is Greenwich Mean Time 116
- Refer to Section 11.3.3 116
- 6.7.10. Random Transmissions 117
- 6.7.11. GOES Binary Format 117
- Refer to Section 10.6 118
- 6.8.2. ARGOS Coverage 119
- 6.8.3. Data Recovery 119
- 6.8.5. ZENO 120
- 6.8.6. ARGOS Binary Format 122
- 6.9. PASSTHROUGH MODES 122
- Refer to Section 6.9.3 124
- Refer to Appendix A 127
- 6.10. REPEATER CAPABILITY 128
- Refer to Section 4.6 129
- Refer to Section 5.5 129
- 6.11.1. Overview 132
- 6.11.4. Wiring Diagram 137
- INTERFACE 138
- 7. MONITORING & 140
- CALIBRATING SENSOR 140
- Refer to Section 10.3.13 141
- Refer to Section 2.4.2 142
- 8. ZENO 146
- -3200 ACCESS 146
- PRIVILEGES 146
- 9. UPLOADING AND 149
- DOWNLOADING AN 149
- ENTIRE CONFIGURATION 149
- ZENOSOFT 153
- VERSIONS 153
- 10. ZENO 155
- CONFIGURATION 155
- SPECIFICS 155
- 10.3. DEFINING THE SENSORS 156
- Refer to Section 12.2 157
- 10.3.1. Analog Sensors 158
- 10.3.2. Digital Sensors 161
- Refer to Section 6.12 173
- Refer to Section 10.3.5 175
- C is given by the equation: 180
- -3200 USER MANUAL 184
- Page 176 184
- 10.5. DEFINING CONSTANTS 188
- Refer to Section 11 189
- Refer to Section 2.3.1 189
- Refer to Section 4 189
- Page 186 194
- Refer to Section 10.4.4 199
- Refer to Section 5 203
- Refer to Section 5.6 203
- Refer to Section 4.4.2 203
- Refer to Section 10.6.3 207
- Refer to Section 4.2 207
- Refer to Section 6.1 208
- 11. ALARM MESSAGES 213
- Refer to Section 6.7 216
- Refer to Section 6.8 216
- 11.3. CONFIGURING THE ZENO 217
- ALARM MESSAGE 217
- Refer to Section 6.4 218
- Refer to Section 0 218
- Refer to Section 11.3 218
- Refer to Section 11.3.1 218
- 12. ADVANCED ZENO 222
- 3200 CONFIGURATION 222
- 12.1.2. The ZENO 223
- -3200 Internal Clock 223
- 12.1.4. ZENOSOFT 224
- and Multitasking 224
- Refer to Section 10.3.7 225
- -3200 To Measure All Sensor 227
- Records 227
- TNTNTNTNTNT 230
- Refer to Section 10.3.8 231
- 12.2.2. The Sensor Menu 232
- Refer to Section 12.2.3 233
- Refer to Section 12.2.2 234
- Refer to Section 9.1 238
- Refer to Section 9.2 238
- ", % and \ 243
- -3200'S 247
- (MULTIPROCESSING) 247
- 13. ELECTRICAL 249
- CONSIDERATIONS 249
- Converter 250
- Chassis 252
- 13.4. THE ZENO 253
- -3200 CPU BOARD 253
- 13.5. SERIAL PORT WIRING 253
- A. CONSTANTS 261
- CONVERSIONS & ASCII 261
- 2. CONVERSION CONSTANTS 262
- 3. ASCII CODES 264
- Page A-6 266
- B. ZENO 267
- -3200 MENU 267
- Page B-2 268
- Page B-3 269
- Page B-4 270
- Page B-5 271
- Page B-6 272
- Page B-7 273
- Page B-8 274
- Page B-9 275
- Page B-10 276
- C. SENSOR 277
- CONFIGURATIONS 277
- 3. BAROMETRIC PRESSURE 280
- 4. 20MA CURRENT LOOP 281
- PLATINUM RTD 286
- 8. SDI-12 SENSOR 289
- DEFAULT 290
- 11. ELLIASON CEILOMETER 294
- 12. VAISALA 299
- 425AH OR 425AHW ANEMOMETER 299
- D. ZENO 305
- -3200 PROCESS 305
- Refer to Section 3.1.3 307
- 1.4. Block Average Process 308
- 1.5. Accumulation Process 309
- 1.6. Rate of Change Process 310
- 1.7. Differential Process 310
- 1.9. Collection Process 311
- 1.10. Trend Data Process 312
- Refer to Section 5.7 314
- Refer to Section 10.3.4 319
- Refer to Section 5.8 319
- 2.6. Rainfall Process 320
- 2.7. Dewpoint Process 321
- 396.6106 323
- 0091379024.066082.26 323
- 089 1 1 324
- 325
- 328
- 3. ALARM PROCESSES CATEGORY 333
- 3.2. Data Range Process 335
- 3.3. Alarm Process 335
- 3.4. Data Time-out Process 336
- 3.5. Alarm Reset Process 336
- 3.9. Multiple Alarm Process 339
- Refer to Section 11.3.2 340
- Refer to Section 10.4.5 341
- 3.13. Timed Event Process 342
- 3.15. Static Alarm Process 343
- 4.1. NTC Thermistor Process 343
- ABRC R ln (ln ) 344
- 4.3. Thermocouple Process 345
- 4.5. UV Biometer Process 347
- TTKTEPIR 348
- 5.16. Data Rounding Process 351
- E. CONFIGURATION FILE 353
- CONTENTS 353
- Refer to Section 9.4 354
- - Zero-offset check period 356
- F. LIBRARY OF CCSAIL 359
- COMMANDS 359
- 2. RESPONSES 360
- ERRORnnn 361
- 3. TIME COMMANDS 361
- 4. DATA RETRIEVAL COMMANDS 362
- Refer to Section 4.3 363
- Refer to Section 4.1.5 363
- Refer to Section 4.1.2 364
- 5. USER INTERFACE ACCESS 365
- Refer to Section 10.8 367
- Refer to Section 6.9.1 367
- Refer to Section 6.9.2 367
- Refer to Section 10.5 370
- Refer to Section 6.10 371
- Refer to Section 10 377
- G. INDEX 381
- , 74, E-2 384
- Rain Data, D-16 389
- , 21, 24, 206, 220 390
- , 20, 21, 22, 51, 52, 220, B 390
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