Vaisala HMP228 User Manual

Page 3

HMP228

M210282en-A

Operating Manual

iii

Contents

PRODUCT DESCRIPTION ................................................................................................... 1

1.1

General characteristics........................................................................................... 1

1.2

Typical applications ................................................................................................ 1
1.2.1

About the method used for measuring moisture in oil ................................ 1

1.2.2

Lubrication oil in paper machines .............................................................. 2

1.2.3

Transformer oil ......................................................................................... 2

INSTALLATION ................................................................................................................... 3

2.1

Selecting the place of installation for the probe and the transmitter................... 3

2.2

Mounting.................................................................................................................. 4
2.2.3

Installing the probe through the ball valve assembly.................................. 6

2.2.4

Mounting the probe directly in the process pipe ......................................... 9

2.3

Signal cabling and grounding .............................................................................. 10
2.3.1

Electrical connections ............................................................................. 10

2.3.2

Connection to an AC supply .................................................................... 11

2.3.3

Grounding ............................................................................................... 12

COMMISSIONING.............................................................................................................. 14

3.1

Changing the parameters ..................................................................................... 14
3.1.1

Security lock jumper................................................................................ 14

3.1.2

Commands and security lock jumper....................................................... 15

3.2

Using the RS 232C serial bus ............................................................................... 16

3.3

Using LED commands........................................................................................... 18

3.4

Using display/keypad commands......................................................................... 18
3.4.1

Display mode .......................................................................................... 18

3.4.2

Command mode ..................................................................................... 19

3.4.3

Entering numbers.................................................................................... 19

MAINTENANCE ................................................................................................................. 20

4.1

Self-diagnostics .................................................................................................... 20

4.2

Reference measurements ..................................................................................... 20

4.3

Moisture calibration .............................................................................................. 21
4.3.1

Two point calibration procedure ............................................................... 22

4.3.1.1

Using serial commands ............................................................................ 22

4.3.1.2

Using display/keypad commands ............................................................. 22

4.3.1.3

Using LED commands.............................................................................. 23

4.3.2

One point calibration procedure ............................................................... 23

4.3.2.1

Using serial commands ............................................................................ 23

4.3.2.2

Using display/keypad commands ............................................................. 24

4.3.2.3

Using LED commands.............................................................................. 24

4.4

Changing the moisture sensor ............................................................................. 24
4.4.1

Calibration procedure after sensor change ............................................... 25

4.4.1.1

Using serial commands ............................................................................ 25

4.4.1.2

Using display/keypad commands ............................................................. 25

4.4.1.3

Using LED commands.............................................................................. 26

4.4.5

Humidity calibration table ......................................................................... 27

4.6

Temperature calibration........................................................................................ 27
4.6.1

One point offset correction ....................................................................... 27

4.6.1.1

Using serial commands ............................................................................ 27