Vaisala DRYCAP DMT340 SERIES Guide de l'utilisateur Page 141
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Chapter 6 ___________________________________________________Calibration and adjustment
VAISALA ______________________________________________________________________ 141
CHAPTER 6
CALIBRATION AND ADJUSTMENT
Calibration
DMT340 is fully calibrated and adjusted as shipped from the factory. The
typical calibration interval is two years. Calibration must always be done
when there is reason to believe that the device is not within the accuracy
specifications.
It is recommended that the device should be sent toVaisala Service
Centers for calibration and adjustment, see contact information on page
139.
(Vaisala hand-held dewpoint meter DM70 can also be used).
User Calibration and Adjustment
When adjusting DMT340, the reading is changed to correspond to the
reference value. After the adjustment, the original calibration certificate
shipped with the product is no longer valid.
NOTE
Dewpoint calibration should be carried out in Vaisala or in other
laboratory conditions.
The reference condition of the dewpoint must be traceable to the
appropriate standards. The user adjustment requires a stable humidity
generator capable of producing the required humidities and a calibrated
reference dewpoint meter. For adjustment, the probe and the reference
dewpoint meter are connected to the humidity generator output, the
reference condition is adjusted and let to stabilize. After the probe and
the reference dewpoint meter are stabilized, the DMT340 reading is
adjusted to correspond the reference value.
For the adjustment of DMT340 equipped with DRYCAP
®
180M-sensor,
the reference low dewpoint temperature should be between -57 °C and -
67 °C (-70.6 °F ... -88.6 °F) in the gas temperature of approx. +20 °C.
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 6
- CHAPTER 6 6
- CHAPTER 7 7
- APPENDIX A 7
- List of Figures 9
- List of Tables 11
- GENERAL INFORMATION 13
- Version Information 14
- Feedback 14
- Recycling 15
- Regulatory Compliances 16
- Patent Notice 17
- Trademarks 17
- License Agreement 18
- Warranty 18
- PRODUCT OVERVIEW 19
- Basic Features and Options 20
- Structure of the Transmitter 21
- 0604-006 22
- INSTALLATION 25
- 0503-004 26
- 0804-065 26
- 0503-002 28
- Installation Kit 30
- Panel Mounting Frame 30
- 0704-002 31
- 0804-083 31
- Grounding the Cables 33
- 0605-028 34
- Probe Mounting 36
- Use with Sampling Cell 37
- CAUTION 38
- 0506-029 39
- 0503-034 40
- 0503-033 40
- 0503-021 42
- Standard 178 mm 120 mm 44
- Optional 400 mm 340 mm 44
- Tightening the Clasp Nut 45
- 0507-043 47
- Leak Screw Installation 49
- Process 50
- 0706-001 51
- 0503-022 53
- WARNING 55
- Warnings 55
- Installation 55
- Third Analog Output 59
- Alarm Relays 60
- RS-422/485 Interface 62
- LAN Interface 64
- WLAN Interface 65
- 0706-068 68
- OPERATION 71
- Graphic History 72
- 0706-030 73
- Changing the Language 75
- Rounding Setting 76
- Display Backlight Setting 76
- Display Contrast Setting 76
- Keypad Lock (Keyguard) 76
- Factory Settings 77
- Display Alarms 78
- 0802-069 79
- 0802-070 79
- Serial Line Communication 80
- User Port Connection 81
- Service Port Connection 82
- Using the Service Port 83
- LAN Communication 84
- Wireless LAN Configuration 87
- 0802-111 88
- 0802-110 88
- 0802-112 88
- Terminal Program Settings 91
- 0810-070 92
- List of Serial Commands 94
- Serial Line 96
- FTIME and FDATE 97
- General Settings 98
- Using Display/Keypad 101
- Using Serial Line 102
- Date and Time 103
- User Port Serial Settings 104
- Data Filtering 106
- Device Information 107
- Data Recording 111
- Analog Output Settings 114
- 0503-045 115
- AMODE/ASEL 117
- Analog Output Tests 118
- Operation of Relays 120
- Hysteresis 121
- 0610-077 123
- Networking Commands 127
- Sensor Functions 130
- Sensor Purge 131
- Manual Sensor Purge 132
- Interval Purge 132
- Power-up Purge 133
- Sensor Warming 134
- MAINTENANCE 135
- Error States 136
- Table 30 Error Messages 137
- Technical Support 138
- Return Instructions 138
- Vaisala Service Centers 139
- CALIBRATION AND ADJUSTMENT 141
- Adjustment Information 143
- Adjusting Dewpoint T 144
- 0706-020 145
- 0706-021 145
- 0706-022 145
- 0706-023 145
- 0706-024 147
- 0706-025 147
- 0706-026 147
- Adjusting Temperature 149
- Adjusting Analog Outputs 151
- TECHNICAL DATA 153
- Operating Environment 154
- Inputs and Outputs 154
- Mechanics 155
- Probe Specifications 155
- Modules 156
- RS-485 Module 157
- LAN Interface Module 157
- WLAN Interface Module 157
- Data Logger Module 157
- Options and Accessories 158
- Dimensions (mm/inch) 160
- 0804-035 161
- 0506-034 161
- 0804-129 163
- 0704-054 163
- CALCULATION FORMULAS 165
- 68.216 166
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