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Chapter 7 _____________________________________________________ Measuring the Dewpoint
VAISALA _______________________________________________________________________ 41
CHAPTER 7
MEASURING THE DEWPOINT
This chapter provides instructions on how to conduct dewpoint
measurements with the DM500, and contains additional information
about the moisture phases.
Dewpoint Measurement with DM500
Do not assemble the instrument in a location where condensed water
dripping out of the system could cause a hazard, like above high-
voltage power supplies.
1. After the installation procedures, turn the power on by pressing
the power ON/OFF button .
2. Let the system warm up for at least 1 minute before starting the
measurements.
3. When the device is ready for use, the following display appears:
Display before activating the
measurement mode
4. Select the water or air cooling method. Press the soft key ►
Measu settings, select by using arrow button Cooling method. Select
WATER or AIR . See page 38, Selecting the cooling method.
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 17 6
- CHAPTER 18 7
- CHAPTER 19 7
- APPENDIX A 7
- List of Figures 8
- List of Tables 8
- GENERAL INFORMATION 9
- General Safety Considerations 10
- ESD Protection 11
- Regulatory Compliances 11
- Trademarks 14
- License Agreement 14
- Warranty 14
- PRODUCT OVERVIEW 15
- Front Panels 17
- Back Panels 19
- FUNCTIONAL DESCRIPTION 23
- Sensing Element 24
- RF-Signal 24
- Contamination and Chemical 25
- Resistance 25
- GENERAL INFORMATION ABOUT 27
- SAMPLING AND RESULTS 27
- Measuring in Overpressure 28
- Cooling Capacity 29
- Flow l/min 31
- Tsensor /C 31
- INFORMATION ON OPTIONAL PARTS 33
- SETTING UP FOR OPERATION 37
- Selecting the Cooling Method 40
- Connecting the Cooling Liquid 41
- MEASURING THE DEWPOINT 43
- START/STOP 44
- DISPLAYS AND MENUS 47
- Graphical Display 48
- Menus and Navigation 49
- BASIC SETTINGS 51
- Key Click ON/OFF 52
- Setting Date and Time 52
- Device Information 53
- Reverting Factory Settings 54
- DISPLAY SETTINGS 55
- Hold/Save Display 56
- Graphic Trend 57
- Contrast Adjustment 58
- Alarm Sound 58
- MEASUREMENT SETTINGS 61
- Forced Freezing 62
- Cooling Method Air/Water 62
- Statistical Filtering 63
- Response Speed 64
- Pump ON/OFF 64
- Transient Recovery Time 65
- OK to confirm the settings 66
- SELF DIAGNOSTICS SETTINGS 67
- Sensor Circuit Check 68
- Cooling Capacity Test 69
- Error History 70
- RECORDING DATA 71
- Stopping Recording 72
- Viewing Recorded Data 72
- Deleting All Record Files 73
- OUTPUT INTERFACES 75
- Serial Communication Settings 76
- Analog Outputs (Optional) 77
- Relay Outputs (Optional) 79
- CALIBRATIOND AND ADJUSTMENT 83
- Making an Adjustment 84
- SERIAL LINE COMMANDS 87
- Output Commands (DMI500) 88
- >intv 1 min 90
- Output interval: 1 MIN 90
- Operational Commands 93
- HEAT ON/OFF<cr> 94
- Detection 94
- SCAL<cr> 95
- PTEST<cr> 95
- ANAL ON/OFF<cr> 96
- Freezing Procedure 96
- FFROST ON/OFF<cr> 96
- Setting Commands 97
- TIME [date time]<cr> 98
- RSEL Setting the Relays 98
- RSEL [q1 q2]<cr> 98
- ASEL [x y z]<cr> 99
- AERR<cr> 100
- COOLER [WATER/AIR]<cr> 101
- FLOW Setting the Flow Value 101
- FLOW<cr> 101
- TP Setting the Temperature 103
- TP<cr> 103
- XTP xx.xx<cr> 103
- Adjustments 104
- Example: 105
- CTP<cr> 106
- FCAL<cr> 107
- PCAL<cr> 107
- OPEN x<cr> 110
- CLOSE<cr> 110
- PLAY [file]<cr> 110
- VERS<cr> 112
- MI70 LINK PROGRAM 113
- Displayed Quantities 114
- Sensing Unit Status 114
- Real-Time Quantities 114
- Real-Time Update Interval 114
- MAINTENANCE 115
- Error Messages 117
- Technical Support 118
- Return Instructions 118
- SPECIFICATIONS 121
- Dew / Frostpoint [°C] 122
- Integrated Flow (Optional) 123
- DMP501 Dewpoint Sensing Unit 123
- Options for DMP501 124
- DMI500 User Interface Unit 124
- Electromagnetic Compatibility 125
- Dimensions (in mm) 125
- PPPPP +++= (1) 129
- Saturation Vapor Pressure 130
- Dewpoint Temperature (T 130
- Frost Point Temperature (T 130
- Relative Humidity (RH) 131
- Mixing Ratio (x) 132
- Absolute Humidity (a) 133
- Wet Bulb Temperature 133
- Enthalpy (h) 133
- // PwPtPwPt = (11) 134
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