Vaisala HUMICAP HMT330 SERIES Guía de usuario Pagina 124
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User's Guide ______________________________________________________________________
124 _________________________________________________________________ M210566EN-H
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 64 below. The sensor polymer absorbs the
interfering chemical; and this reduces the ability of the polymer to absorb
water molecules and 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 64 Decrease of Sensor Gain
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 6
- CHAPTER 6 7
- CHAPTER 7 7
- APPENDIX A 8
- APPENDIX B 8
- List of Figures 9
- GENERAL INFORMATION 13
- Version Information 14
- Feedback 15
- ESD Protection 15
- Recycling 16
- Regulatory Compliances 16
- Patent Notice 18
- Trademarks 18
- License Agreement 18
- Warranty 18
- PRODUCT OVERVIEW 19
- Basic Features and Options 20
- Structure of the Transmitter 21
- 0508-010 22
- 0911-066 24
- INSTALLATION 27
- 0503-004 28
- 0804-065 28
- Pole or Pipeline 30
- 0503-007 31
- 0503-041 31
- Panel Mounting Frame 33
- Cable Bushings 34
- Grounding the Cables 35
- WARNING 37
- CAUTION 38
- 0703-041 39
- Probe Mounting 40
- 0507-024 41
- Applications 43
- 0506-029 44
- 0503-034 44
- Temperature Probe (Optional) 46
- 0507-025 47
- 0508-077 47
- Optional Modules 49
- Installation 50
- Warnings 50
- Third Analog Output 53
- Installation and Wiring 54
- RS-422/485 Interface 57
- 1 (not connected) RxB 58
- 2 (not connected) RxA 58
- 4 B TxB 58
- 5 A TxA 58
- LAN Interface 59
- WLAN Interface 60
- Attaching the WLAN Antenna 61
- Data Logger Module 62
- 0706-068 63
- OPERATION 65
- Graphic History 66
- 0706-030 67
- Changing the Language 69
- Rounding Setting 69
- Display Backlight Setting 69
- Display Contrast Setting 70
- Keypad Lock (Key guard) 70
- Menu PIN Lock 70
- Display Alarms 71
- Configuring a Display Alarm 72
- Serial Line Communication 73
- RS-232 10…36 V= 74
- Service Port Connection 75
- Using the Service Port 76
- LAN Communication 77
- Wireless LAN Configuration 80
- 0802-111 81
- 0802-110 81
- 0802-112 81
- Telnet Settings 83
- Terminal Program Settings 84
- 0810-070 85
- List of Serial Commands 87
- Serial Line 89
- Outputting Reading Once 90
- FTIME and FDATE 91
- General Settings 92
- Example: 94
- Date and Time 97
- User Port Serial Settings 98
- Data Filtering 101
- Device Information 101
- 0706-002 102
- Data Recording 104
- View Recorded Data 105
- Analog Output Settings 108
- 0503-045 109
- Analog Output Quantities 110
- AMODE/ASEL 111
- Analog Output Tests 112
- Operation of Relays 114
- Hysteresis 115
- Enabling/Disabling Relays 116
- Setting Relay Outputs 117
- Testing Operation of Relays 119
- Networking Commands 120
- Sensor Functions 124
- Manual Chemical Purge 125
- Chemical Purge in Power Up 125
- Using Buttons on Motherboard 126
- Using Serial Line 127
- Sensor Heating 128
- MAINTENANCE 131
- Changing the Sensor 132
- Error States 133
- Table 29 Error Messages 134
- Technical Support 135
- Return Instructions 135
- Vaisala Service Centers 136
- CALIBRATION AND ADJUSTMENT 137
- 0508-013 138
- 0706-007 138
- Using Display/Keypad 140
- Temperature Adjustment 143
- Analog Output Adjustment 145
- TECHNICAL DATA 147
- Optional Temperature Probe 148
- Calculated Variables 149
- 1013 mbar) 149
- Probe Option) 151
- Operating Environment 151
- Inputs and Outputs 152
- Mechanics 152
- Modules 153
- Relay Module 154
- RS-485 Module 154
- LAN Interface Module 154
- WLAN Interface Module 154
- Options and Accessories 155
- Dimensions (mm/inch) 157
- 0804-035 158
- 0804-060 160
- 0804-059 160
- Temperature Probe 162
- PROBE INSTALLATION KITS AND 163
- INSTALLATION EXAMPLES 163
- HMT337) 164
- Cable Gland 166
- 0508-015 167
- 0508-022 167
- 0507-015 169
- 0507-043 170
- 0804-063 172
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