Manual

E-M-HM-V1_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide
Instruction Manual
Document Type
Page
9 of 20
Document title
© 2009-2011; Rotronic AG E-M-HM-V1_12
Functions
Applicability
Factory default
Humidity / temperature adjustment
3-wire
Device write protection
2-wire, 3-wire
Disabled (HygroMet and probe)
Limit humidity output to 100 %RH
2-wire, 3-wire
Enabled (probe)
Out-of-limit value digital / display alarm
2-wire, 3-wire
Disabled (HygroMet and probe)
Data recording (probe)
3-wire
Enabled (loop mode – 10 min. interval)
Automatic humidity sensor test
3-wire
Disabled (probe)
Humidity sensor drift compensation
3-wire
Disabled (probe)
Fail safe mode
2-wire, 3-wire
Disabled (probe)
Monitor probe alarms
2-wire, 3-wire
Enabled
Loss of communication with probe
2-wire, 3-wire
Disabled (HygroMet)
Simulator mode
2-wire, 3-wire
Disabled (HygroMet and probe)
o For a detailed description of all AirChip 3000 main functions see document E-T-AC3000-DF-V1
o Instructions regarding the configuration of the HygroMet MP and probe as well as access to the functions
are provided in the following manuals:
E-M-HW4v3-Main
E-M-HW4v3-F2-014
E-M-HW4v3-F2-001
E-M-HW4v3-DR-001
E-M-HW4v3-A2-001
E-M-AC3000-CP
o The factory default setting for dew / frost point calculation is frost point below freezing
4.4 Interaction between the HygroMet MP and probe functions
It is important to note that when used together, the HygroMet MP transmitter and HC2 probe (HygroClip 2)
constitute a 2-component system. Each system component has its own microprocessor, firmware and
functions. Some of these functions are unique to each system component. Other functions are found in both
components.
2-wire, loop powered HygroMet version: due to the necessity of limiting the current consumption of the
combination of HygroMet and HC2 probe to less than 4 mA, several probe functions such as RH sensor test,
data recording and probe adjustment are not available.
The functions and settings of the HygroMet MP (HM) and HygroClip 2 probe (HC2) operate together as
indicated below:
Function / Setting HM HC2 Notes
Device protection
X
X
Individual to the HygroMet and HC2 probe
RS-485 address
X
X
Individual to the HygroMet and HC2 probe
Device Name
X X
User defined description
The device name of the HC2 probe is not displayed by HW4 and is
replaced with the HygroMet Input Name
Calculation
X X
Psychrometric calculation
HygroMet setting overrides HC2 probe setting