Vaisala HMP228 Guía de usuario Pagina 57
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Valorado. / 5. Basado en revisión del cliente
Chapter 5 ___________________________________________ CALIBRATION AND ADJUSTMENT
8. Calibration is done. To return to the basic display, first press the
BACK key and then press the EXIT key.
Last Adjustment Date
To see the last adjustment date, select Last adjustment date. You can
check this date also from the Device information. For more
information, see section Device Information on page 29.
Determination of Oil-specific Coefficients
The equation of the Ppm conversion is:
ppm = aw*10
(B+A/T)
With the following procedure the coefficients A and B can be defined
for the equation:
LOG(PPM
sat
)= B + A/T
Equipment needed:
- Apparatus for determining water content ( for example,
coulometric titrator and e.g. magnetic stirrer.)
- Oil test station:
- a temperature test chamber
- for example, a conical flask (1L) sealed by PTFE stopper
with an inlet for a moisture probe
- MMT330 by Vaisala
- magnetic stirrer.
Procedure:
1. Define the water content of the oil sample with the titration. Use
the oil moisture level that is close to real conditions in the
process.
2. Measure the water activity of this sample with MMT330 at two
temperatures that differ at least 20 °C. Follow the measurement
stabilization illustrated by the graph.
NOTE
The sample has to be sealed very carefully i.e. not to be in contact
with ambient air, which would change the water content.
VAISALA _______________________________________________________________________ 55
- USER'S GUIDE 1
- Table of Contents 3
- CHAPTER 5 4
- List of Figures 5
- List of Tables 6
- GENERAL INFORMATION 7
- Recycling 8
- Trademarks 8
- License Agreement 8
- Warranty 9
- PRODUCT OVERVIEW AND 11
- MECHANICS 11
- 0605-094 12
- Display Parameters 14
- Options 14
- INSTALLATION AND MOUNTING 15
- OPTIONS 15
- Pipelines/Oils 16
- Installing the Probe 16
- Tightening the Clasp Nut 17
- 0605-080 18
- 0605-085 20
- MENU OPERATIONS AND SETTINGS 23
- Basic Display 24
- Graphical Display 25
- Main Menu 25
- Settings 26
- Display Settings 26
- Quantities and Units 26
- Rounding 26
- Hold/Save Display 27
- Graphic History 27
- User Interface Settings 28
- Selecting Language 29
- Automatic Power Off 29
- Changing the Shorcut Keys 30
- On/Off 30
- Setting Date and Time 30
- Device Information 31
- Restoring Factory Settings 32
- PPM-calculation 32
- Coefficients 33
- MI70 Memory 33
- Other Functions 34
- Setting the Alarm Levels 34
- 0605-093 36
- Recording Data 38
- Recording 38
- Stopping Recording 39
- Viewing Recorded Data 40
- Checking the Memory Status 40
- Deleting All Recorded Files 40
- CALIBRATION AND ADJUSTMENT 43
- HMP228 Series Transmitters 44
- 1-point Relative Humidity 45
- 2-point Relative Humidity 46
- MMT318 Transmitters 47
- Calibrator 48
- MMT330 Transmitters 50
- 2-point Adjustment 54
- 1-point Adjustment 55
- Temperature Adjustment 55
- Last Adjustment Date 57
- Error Messages 59
- Error Message Types 59
- MAINTENANCE 61
- Changing the Battery 62
- Vaisala Service Centers 63
- TECHNICAL SPECIFICATIONS 65
- MMP78 Probe 66
- MI70 Indicator 66
- Battery Pack 67
- General Facts about the MM70 67
- Hand-held Humidity and 67
- Temperature Meter 67
- Dimensions in mm (inches) 69
- Figure 22 MMP78 Probe 70
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