Vaisala DEWCAP DM500 - Page 45

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Chapter 7 _____________________________________________________ Measuring the Dewpoint

VAISALA _______________________________________________________________________ 43

automatically converted to a corresponding dewpoint temperature,

which is then displayed to the user. The symbol on the display

changes to 7 after the freezing is complete.

Table of Contents

Default Chapter3
- Table of Contents3
Chapter 1 General Information9
- About this Manual9
- Safety10
- Regulatory Compliances11
- Trademarks14
- License Agreement14
- Warranty14
Chapter 2 Product Overview15
- Product Description15
- Front Panels17
- Figure 1 DMI500 User Interface Unit Front Panel17
- Figure 2 DMP501 Dewpoint Sensing Unit Front Panel18
- Back Panels19
- Figure 3 DMI500 User Interface Unit Back Panel19
- Figure 4 DMP501 Dewpoint Sensing Unit Back Panel20
- Optional Accessories and Spare Parts21
- Factory Calibration and Service21
- Functional Description23
Chapter 3 Functional Description23
- DM500 Principle of Operation23
Chapter 4 General Information about Sampling and Results27
- Gas Sampling27
- Measuring in Overpressure28
- The Effect of the Ambient Temperature on Cooling Capacity29
- Figure 7 Effect of Ambient Air Temperature on Lowest Achievable Stable Sensor Temperature29
- The Effect of the Liquid Coolant Temperature on Cooling Capacity30
- Figure 8 Effect of Water Temperature on Lowest Achievable Stable Sensor Temperature30
- The Effect of the Sample Gas Flow Rate on Cooling Capacity and Result Deviation31
- Figure 9 Effect of Sample Flow Rate on Lowest Achievable Sensor Temperature31
- Figure 10 Effect of Sample Flow Rate on Dewpoint Measurement at31
Chapter 5 Information on Optional Parts33
- Optional Heated Gas Tubes33
- Optional External Temperature Sensor34
- Figure 11 Mechanical Dimensions (in MM) for Optional Temperature Sensor34
- Wetted Materials of the Optional Parts35
Chapter 6 Setting up for Operation37
- Connection of the DMI500 and DMP501 Units37
  - Swagelok Tube Fittings' Installation Instructions38
  - Figure 12 Standard 6 MM Swagelok Tube Fitting with the Elbow Connector in the DMP501 Back Panel38
- Connecting the Sample Gas Flow39
- Figure 13 ¼" Swagelok Adapter Fitting Connected to the Standard Swagelok 6 MM Connector39
- Figure 14 DMP501 Back Panel, Connectors for Sample Gas39
- Selecting the Cooling Method40
- Connecting the Cooling Liquid41
- Figure 15 DMP501 Back Panel, Connectors for Cooling Liquid41
- Connecting the Condensation Water Drain Tube42
Chapter 7 Measuring the Dewpoint43
- Dewpoint Measurement with DM50043
- More about the Moisture Phases44
Chapter 8 Displays and Menus47
- Main View (in Measuring Mode)47
- Figure 16 Main View Display47
- Graphical Display48
- Figure 17 DM500 Graphical Display48
- Menus and Navigation49
- Figure 18 DM500 Menus and Displays49
Chapter 9 Basic Settings51
- User Interface51
- Setting Date and Time52
- Device Information53
- Figure 19 DMI500 User Interface Unit Information53
- Figure 20 DMP501 Dewpoint Sensing Unit Information53
- Reverting Factory Settings54
Chapter 10 Display Settings55
- Display Backlight55
- Selecting the Quantities and Units55
- Hold/Save Display56
- Graphic Trend57
- Contrast Adjustment58
- Alarm Sound58
Chapter 11 Measurement Settings61
- Automatic Frost Detection61
- Forced Freezing62
- Cooling Method Air/Water62
- Statistical Filtering63
- Response Speed64
- Pump ON/OFF64
- Transient Recovery Time65
- Setting the Temperature, Pressure, and Flow Values65
Chapter 12 Self Diagnostics Settings67
- Salt Detection67
- Sensor Circuit Check68
- Cooling Capacity Test69
- Error History70
Chapter 13 Recording Data71
- Data Recording71
- Stopping Recording72
- Viewing Recorded Data72
- Checking the Recording Memory Status72
- Deleting All Record Files73
- Output Interfaces75
Chapter 14 Output Interfaces75
- Figure 21 DMI500 User Interface Unit Back Panel (same as Figure 3)75
Chapter 15 Calibrationd and Adjustment83
- General about Calibration and Adjustments83
- Making an Adjustment84
- Figure 22 Gas Flow Rate from the Humidity Generator84
Chapter 16 Serial Line Commands87
- Serial Commands87
- Output Commands (DMI500)88
  - R Continuous Output88
- S Stopping the Continuous Output89
- ADDR Setting the Device Address89
- SEND Outputting One Single Reading89
- INTV Setting the Output Interval89
- FORM Defining the Output Format90
- Operational Commands93
- Setting Commands97
- Adjustments104
- Others108
- Mi70 Link Program113
Chapter 18 Maintenance115
- Cleaning the Sensor115
- Error Messages117
- Technical Support118
- Return Instructions118
Chapter 19 Specifications121
- Measured Variables121
- General123
- Outputs125
- Electromagnetic Compatibility125
- Dimensions (in MM)125
Appendix Ahumidity Theory129
- Measured and Calculated Results of DM500129
- Water Vapor in Air129
- Saturation Vapor Pressure130
- Dewpoint Temperature (T D )130
- Frost Point Temperature (T F )130
- Partial Pressure of Water Vapor (P )131
- Relative Humidity (RH)131
- Figure 25 Partial Pressure of Water Vapor over Water and Ice131
- Mixing Ratio (X)132
- Figure 26 Water Vapor Saturation Curves132
- Absolute Humidity (A)133
- Absolute Humidity at NTP (Antp)133
- Wet Bulb Temperature133
- Enthalpy (H)133
- Humid Air Volume/Dry Air Volume PPM134
- Effect of Pressure on Dewpoint134
- Using a Condensation Hygrometer134

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