Vaisala HMT330 Manuel d'utilisateur Page 135
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 133
Sensor Functions
Chemical Purge (Optional)
In some specific applications the sensor gain may decrease gradually due
to an interference caused by a particular chemical present in the
measured gas, for example. The decrease of sensor gain due to an
interfering chemical and the effect of the chemical purge process are
illustrated below, see Figure 66 below. The sensor polymer absorbs the
interfering chemical, and this reduces the ability of the polymer to absorb
water molecules. Consequently the sensor gain decreases. In chemical
purge, heating the humidity sensor to a temperature level of
approximately +160 °C for several minutes evaporates the interfering
chemical.
The purge function starts with heating stage, continues with settling and
when the temperature of the sensor is decreased the transmitter returns to
normal mode. The whole cycle takes about 6 minutes.
NOTE
Chemical purge function locks the output values for about 6 minutes.
0508-035
Figure 66 Decrease of Sensor Gain
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 4 4
- CHAPTER 6 7
- CHAPTER 7 7
- CHAPTER 8 7
- APPENDIX A 8
- APPENDIX B 8
- APPENDIX C 8
- List of Figures 10
- List of Tables 12
- GENERAL INFORMATION 13
- Version Information 14
- Documentation Conventions 14
- ESD Protection 15
- Recycling 16
- Regulatory Compliances 16
- DNV Type Approval 17
- Patent Notice 19
- Trademarks 19
- Software License 19
- Warranty 19
- PRODUCT OVERVIEW 21
- Basic Features and Options 22
- Structure of the Transmitter 23
- 0508-010 24
- 0911-066 26
- INSTALLATION 29
- 183 (7.20) 30
- 133 (5.24) 30
- 59 (2.32) 30
- Thickness 30
- 9.5 (0.37) 30
- 0911-061 31
- 0503-007 33
- 0503-041 33
- Panel Mounting Frame 35
- Cable Bushings 36
- Grounding the Cables 37
- WARNING 39
- CAUTION 40
- 0703-041 41
- 0507-024 43
- Applications 45
- 0506-029 46
- 0503-034 46
- Temperature Probe (Optional) 48
- 0508-077 49
- 0507-025 49
- Tightening the Clasp Nut 50
- Optional Modules 51
- Installation 52
- Warnings 53
- Third Analog Output 56
- Installation and Wiring 57
- RS-422/485 Interface 59
- Figure 37 4-Wire RS-485 Bus 62
- 1102-027 63
- WLAN Interface 65
- 0706-068 67
- OPERATION 69
- Graphic History 70
- 0706-030 71
- Changing the Language 73
- Rounding Setting 73
- Display Backlight Setting 73
- Display Contrast Setting 74
- Keypad Lock (Keyguard) 75
- Menu PIN Lock 75
- Configuring Display Alarms 76
- 0802-069 78
- 0802-070 78
- Serial Line Communication 81
- User Port Connection 82
- Service Port Connection 83
- LAN Communication 84
- IP Configuration 85
- Wireless LAN Configuration 88
- Communication Protocol 91
- Terminal Program Settings 92
- 0810-070 93
- List of Serial Commands 95
- Outputting Reading Once 98
- FTIME and FDATE 100
- General Settings 102
- Using Serial Line 103
- Examples: 104
- Using Display/Keypad 106
- Limit RH Output Range 107
- Date and Time 108
- Data Filtering 109
- Device Information 110
- Serial Output Settings 114
- Data Recording 118
- Deleting the Recorded Files 121
- Analog Output Settings 122
- Analog Output Quantities 123
- AMODE/ASEL 124
- Analog Output Tests 125
- Operation of Relays 127
- 1102-007 128
- 1102-040 130
- 0706-003 132
- Testing Operation of Relays 134
- Sensor Functions 135
- Manual Chemical Purge 136
- Chemical Purge in Power Up 136
- Using Buttons on Motherboard 137
- Sensor Heating 140
- CHAPTER 5 143
- Taking Modbus into Use 144
- Enabling Serial Modbus 145
- Enabling Ethernet Modbus 146
- 1101-034 147
- 1101-036 147
- Diagnostic Modbus Counters 149
- Disabling Modbus 150
- MAINTENANCE 151
- Changing the Sensor 152
- Error States 153
- Table 33 Error Messages 154
- Technical Support 155
- Product Returns 155
- CALIBRATION AND ADJUSTMENT 157
- 0508-013 158
- 0706-007 158
- MPC Command Syntax 163
- Temperature Adjustment 167
- Analog Output Adjustment 169
- TECHNICAL DATA 171
- Optional Temperature Probe 172
- Calculated Variables 173
- 1013 mbar) 173
- Probe Option) 175
- Operating Environment 175
- Inputs and Outputs 176
- Mechanics 177
- Modules 178
- RS-485 Module 179
- LAN Interface Module 179
- WLAN Interface Module 179
- Data Logger Module 179
- Spare Parts and Accessories 180
- Dimensions (mm/inch) 182
- 92 (3.62) 183
- 116 (4.57) 183
- 106 (4.17) 184
- 0804-060 185
- 0804-059 185
- 0508-020 185
- PROBE INSTALLATION KITS AND 187
- INSTALLATION EXAMPLES 187
- HMT337) 188
- Cable Gland 190
- 0508-015 191
- 0508-022 191
- 0507-015 193
- 0804-063 196
- 99.621 ×= 198
- MODBUS REFERENCE 201
- Register Map 202
- 16-Bit Integer Format 203
- Measurement Data (Read-Only) 204
- Status Registers (Read-Only) 204
- Configuration Registers 205
- Exception Status Outputs 206
- Diagnostic Sub-Functions 206
- Exception Responses 208
- *M210566EN* 209
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