4.4.7 CLOSE command....................................................................................44
4.4.8 SDELAY command..................................................................................44
4.4.9 SERI command........................................................................................45
4.4.10 ADDR command..................................................................................... 45
4.5 Formatting commands..................................................................................46
4.5.1 FORM command..................................................................................... 46
4.5.2 TIME command....................................................................................... 49
4.5.3 UNIT command....................................................................................... 50
4.6 Chemical purge commands.......................................................................... 50
4.6.1 PUR command........................................................................................ 50
4.7 Extra sensor heating (Xheat) commands.....................................................51
4.7.1 XHEAT command..................................................................................... 51
4.8 Analog output configuration commands.................................................... 52
4.8.1 # command.............................................................................................. 53
4.8.2 AMODE command...................................................................................53
4.8.3 ASEL command.......................................................................................54
4.8.4 AERR command...................................................................................... 55
4.8.5 ATEST command.....................................................................................56
4.9 Pressure compensation commands............................................................. 57
4.9.1 PRES and XPRES commands.................................................................57
4.10 System commands......................................................................................... 57
4.10.1 ? command.............................................................................................. 58
4.10.2 ERRS command.......................................................................................58
4.10.3 FILT command.........................................................................................59
4.10.4 HELP command.......................................................................................59
4.10.5 VERS command...................................................................................... 60
4.10.6 RESET command......................................................................................61
5. Maintenance....................................................................................................62
5.1 HMP155 maintenance.....................................................................................62
5.1.1 Cleaning....................................................................................................62
5.1.2 Changing HMP155 probe filter...............................................................62
5.1.3 Changing HUMICAP sensor....................................................................63
5.2 Errors................................................................................................................65
6. Calibration and adjustment......................................................................66
6.1 Overview......................................................................................................... 66
6.2 Push-button calibration.................................................................................67
6.2.1 Performing two-point humidity and temperature adjustment......... 68
6.2.2 Performing one-point humidity and temperature adjustment......... 69
6.2.3 Passive output version push-button calibration................................. 70
6.3 Serial line calibration......................................................................................70
6.3.1 Two-point humidity adjustment............................................................70
6.3.2 Two-point temperature adjustment.......................................................71
6.3.3 One-point humidity and temperature adjustment..............................72
6.3.4 Adjusting and calibrating relative humidity after sensor change..... 72
HMP155 User Guide M210912EN-D
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