Vaisala HMP240 User Manual
Page 3
HMP240 series
M210300en
User's guide
i
Contents
1.
PRODUCT DESCRIPTION .......................................................................................... 5
2.
ADVANTAGES OF A WARMED SENSOR HEAD ........................................................ 7
3.
INSTALLATION .......................................................................................................... 8
3.1
Selecting the place of installation ................................................................. 8
3.2
Mounting ........................................................................................................ 9
3.2.1
Mounting the HMP243....................................................................... 9
3.2.2
Mounting the HMP247..................................................................... 11
3.3
Grounding .................................................................................................... 13
3.4
Electrical connections ................................................................................. 15
3.4.1
Connection to a 24 VAC supply ....................................................... 16
4.
COMMISSIONING..................................................................................................... 17
4.1
Changing the parameters ............................................................................ 17
4.2
Security lock jumper .................................................................................... 17
4.3
Selecting the analogue outputs .................................................................. 18
4.4
Connecting the RS 232C serial bus............................................................. 20
4.4.1
Reverting to factory settings of the serial port.................................. 22
5.
COMMANDS ............................................................................................................. 24
5.1
Commands and security lock jumper ......................................................... 24
5.2
LED commands ............................................................................................ 25
5.3
Display/keypad commands .......................................................................... 26
5.3.1
Display mode .................................................................................. 26
5.3.2
Command mode ............................................................................. 26
5.3.3
Entering numbers............................................................................ 26
5.3.4
Analogue output commands ............................................................ 27
5.3.4.1
Selecting the output (mA/V) ............................................................ 27
5.3.4.2
Selecting and scaling the analogue output quantities ...................... 28
5.3.5
Output via the serial bus ................................................................. 29
5.3.5.1
Turning the serial interface echo ON/OFF ....................................... 29
5.3.5.2
Serial bus settings........................................................................... 29
5.3.5.3
Setting the transmitter address ....................................................... 30
5.3.5.4
Selecting the output units ................................................................ 31
5.3.5.5
Selecting the calculation mode ........................................................ 31
5.3.6
Output modes ................................................................................. 31
5.3.6.1
Setting the serial interface operation mode ..................................... 32
5.3.7
Others............................................................................................. 33
5.3.7.1
Setting the averaging time............................................................... 33
5.3.7.2
Setting the pressure for mixing ratio and wet bulb
calculations ................................................................................. 33
5.3.7.3
Setting the date............................................................................... 34
5.3.7.4
Setting the time............................................................................... 34
5.3.7.5
Heat on / heat off command ............................................................ 35
5.4
Serial commands.......................................................................................... 35
5.4.1
Analogue output commands ............................................................ 35
5.4.1.1
Setting the analogue outputs ........................................................... 35
5.4.1.2
Selecting and scaling the analogue output quantities ...................... 36
5.4.1.3
Scaling the analogue outputs .......................................................... 36