Vaisala DEWCAP DM500 Guide de l'utilisateur Page 62
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
User's Guide ______________________________________________________________________
60 __________________________________________________________________ M210205EN-D
Forced Freezing
In some measurement conditions there may be formation of a two
phase system, ice-dew, on the sensor. This situation is dynamic and
the time needed to reach an equilibrium may be rather long. To avoid
an unstable phase transition, the DM500 has a function for generating
a stable layer of frost on the sensor right from the beginning of the
measurement.
When turned on, the forced freezing procedure is automatically
enabled when measurement is started. However, the forced freezing
procedure may also be turned off by the user, if so desired.
The automatic forced freezing procedure recognizes the temperature at
which condensation begins to form on the sensor surface. The control
of the forced freezing procedure is based on this temperature, and
therefore the dewpoint of the measured gas should be stable during the
freezing procedure. If forced freezing is enabled and the frostpoint is
ca. -6...-30 ºC, the procedure will freeze the sensor cold enough for the
condensation to form a stable layer of frost. Use of forced freezing
may lengthen the measurement start-up time.
If forced freezing is disabled by the user, in certain conditions
formation of an unstable phase system on the sensor is possible.
1. Open MENU: press .
2. Select ►Measuring, press
3. Select ►Measurement settings, press .
4. Select Forced freezing.
5. To enable the function, press ON.
6. To disable the function, press OFF.
7. Press
EXIT to return to the main view.
Cooling Method Air/Water
Select the cooling method air ( ) or water ( ) by using this function.
Water cooling is recommended when measuring dewpoints below
-50 ºC (-58 ºF) or above +40 ºC (104 ºF).
This selection optimizes the operation of thermoelectric coolers.
- 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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