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VAISALA ________________________________________________________________________ 7
List of Figures
Figure 1
Transmitter Body ...................................................................... 21
Figure 2
Inside the Transmitter............................................................... 22
Figure 3
HMT331 Fixed Probe ............................................................... 23
Figure 4
HMT331 Short Cable Probe ..................................................... 23
Figure 5
Probe Options .......................................................................... 24
Figure 6
Standard Mounting ................................................................... 27
Figure 7
Mounting with Wall Mounting Kit .............................................. 28
Figure 8
Dimensions of the Plastic Mounting Plate (mm/inch)............... 28
Figure 9
Dimensions of the Probe Holder Plate (mm/inch) .................... 29
Figure 10
Mounting with the DIN Rail Installation Kit ............................... 30
Figure 11
Vertical Pole ............................................................................. 30
Figure 12
Horizontal Pole ......................................................................... 31
Figure 13
Mounting with Metal Wall Mounting Plate ................................ 31
Figure 14
Dimensions of the Metal Mounting Plate (mm/inch) ................ 32
Figure 15
Mounting the Rain Shield with the Installation Kit .................... 32
Figure 16
Panel Mounting Frame ............................................................. 33
Figure 17
Panel Mounting Dimensions (mm/inch) ................................... 34
Figure 18
Cable Bushings ........................................................................ 34
Figure 19
Grounding the Screen of Electrical Cable ................................ 35
Figure 20
Screw Terminal Block on Motherboard .................................... 37
Figure 21
Connections to 24 VAC Power Supply..................................... 39
Figure 22
Measurement Error at 100 %RH.............................................. 40
Figure 23
Horizontal Mounting of Probe................................................... 41
Figure 24
Vertical Mounting of Probe ....................................................... 42
Figure 25
HMT344 Probe ......................................................................... 44
Figure 26
Tightening the Nut .................................................................... 44
Figure 27
Cleaning of Tightening Cone.................................................... 45
Figure 28
HMT338 Probe ......................................................................... 47
Figure 29
Sealing of Fitting Body into Process ........................................ 47
Figure 30
Tightening the Clasp Nut.......................................................... 48
Figure 31
Power Supply Module .............................................................. 49
Figure 32
Galvanic Output Isolation Module ............................................ 54
Figure 33
Third Analog Output ................................................................. 54
Figure 34
Third Analog Output Selection ................................................. 55
Figure 35
Relay Module ........................................................................... 57
Figure 36
RS-422/485 Module ................................................................. 58
Figure 37
4-Wire RS-485 Bus .................................................................. 60
Figure 38
2-Wire RS-485 Bus .................................................................. 61
Figure 39
LAN Interface Module............................................................... 63
Figure 40
WLAN Interface Module ........................................................... 64
Figure 41
Data Logger Module................................................................. 66
Figure 42
Pinout of the Optional 8-Pin Connector.................................... 67
Figure 43
Basic Display............................................................................ 70
Figure 44
Graphical Display ..................................................................... 70
Figure 45
Graphical Display with Data Logger......................................... 71
Figure 46
Main Menus .............................................................................. 72
Figure 47
Alarm Limits Shown on Graph Screen ..................................... 76
Figure 48
Display Alarm Active ................................................................ 76
Figure 49
Display Alarms ......................................................................... 77
Figure 50
Modifying an Alarm Limit .......................................................... 77
Figure 51
Service Port Connector and User Port Terminal
on Motherboard ........................................................................ 79
Figure 52
Connection Example between PC Serial Port and
User Port .................................................................................. 80
