Vaisala HMP240 - 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