Vaisala MMT162 Manual de usuario descargar pdf (Pagina 48)

User's Guide ______________________________________________________________________

46 __________________________________________________________________ M210934EN-C

3. Define the correlation between aw, T and PPM (w/w) from the

measured values. Calculate A and B according to the following

example.

[ ] [ ]

( ) ( )

1/1-2/1

1(-2(

TPPM

LOGTPPMLOG

satsat

))

[ ]

)(

A/T1 - 1TPPMLOGB

sat

Example (measured water content 213 ppm):

T (°C)

ppm

saturation

24.1

0.478

213/0.478 = 445.6067

57.6

0.188

213/0.188 = 1132.979

A = (LOG(1132.98)-LOG(445.607))/(1/(57.6+273.16)-

1/(24.1+273.16)) = -1189.4581

B= LOG(445.607)-(-1189.4581)/(24.1 + 273.16) = 6.6503583

Assumptions:

The isoterm of water activity versus water concentration is linear and the

solubility curve has the form of the given equation.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 65 66

USER'S GUIDE 1
Table of Contents 3
CHAPTER 5 4
CHAPTER 6 4
CHAPTER 7 5
List of Figures 6
List of Tables 6
GENERAL INFORMATION 7
Version Information 8
Related Manuals 8
Documentation Conventions 8
Recycling 9
Regulatory Compliances 9
Trademarks 10
License Agreement 10
Warranty 10
PRODUCT OVERVIEW 11
Basic Features and Options 12
Transmitter Structure 13
Typical Applications 14
Transformer Oil 15
Temperature 16
INSTALLATION 17
CAUTION 18
Wiring 19
Connection Cables 20
Power Supply Requirements 21
OPERATION 23
Serial Communication 24
Terminal Program Settings 26
0807-004 27
List of Serial Commands 28
Show Device Information 29
Show Firmware Version 29
Set Serial Line Settings 30
Set Transmitter Address 31
Format Measurement Output 32
Select Unit 34
Set Serial Interface Mode 35
Scaling 35
Calibrate Analog Output 36
Channels 37
Analog Outputs 37
Set Voltage for LED Alarm 38
Extend Analog Output Range 38
Serial Line Output Commands 39
Set Output Interval 40
Output Reading Once 40
Troubleshooting Commands 41
Other Commands 42
Display Command List 43
Reset Transmitter 44
Restore Factory Settings 44
MMT162 ppm Conversion for 45
Transformer Oils 45
Coefficients 45
A/T1 - 1TPPMLOGB 48
MAINTENANCE 49
Changing the Filter 50
Changing the Sensor 50
Error States 50
Unknown Serial Settings 51
Technical Support 52
Product Returns 52
CALIBRATION AND ADJUSTMENT 53
Using Serial Line 54
Using MI70 55
Analog Output Adjustment 60
TECHNICAL DATA 61
Operating Environment 62
Inputs and Outputs 62
Mechanics 62
Spare Parts and Accessories 63
Dimensions in mm (inches) 64
0804-085 65
*M210934EN* 66

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Vaisala MMT162 Manual de usuario Pagina 48

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