ROTRONIC MP400H User Manual
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
HygroMet MP
Humidity Temperatur e Meteorological Probe
User Guide
Instruction Manual
Document Type
Page
1 of 19
© 2009; Rotronic AG E-M-HM-V1_10
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
Instruction Manual
Page
2 of 19
Document Type
Table of contents
1
Overview .............................................................................................................................................. 3
2 Mechanical configurations and dimensions ..................................................................................... 4
3 General description ............................................................................................................................. 5
3.1 Power supply .................................................................................................................................... 5
3.2 Measured parameters ...................................................................................................................... 5
3.3 Calculated parameters ..................................................................................................................... 5
3.4 Output signals ................................................................................................................................... 6
3.5 Analog output signal type ................................................................................................................. 6
3.6 Service connector ............................................................................................................................. 6
3.7 Probe ................................................................................................................................................ 6
4 User configurable settings and functions ......................................................................................... 6
4.1 Requirements for configuring the HygroMet MP ............................................................................... 7
4.2 Function overview ............................................................................................................................. 7
4.3 Factory default settings .................................................................................................................... 8
4.4 Interaction between the HygroMet MP and probe functions ............................................................. 9
5 Mechanical installation ..................................................................................................................... 10
5.1 General guidelines .......................................................................................................................... 10
6 Electrical installation ........................................................................................................................ 10
6.1 General wiring guidelines ............................................................................................................... 10
6.2 Guidelines for RS-485 wiring (HygroMet MP 3-wire) ...................................................................... 11
6.3 Wiring color code ............................................................................................................................ 11
6.4 Electrical diagram ........................................................................................................................... 12
7 Operation ........................................................................................................................................... 13
7.1 Analog outputs ................................................................................................................................ 13
7.2 RS-485 serial interface ................................................................................................................... 13
8 Maintenance....................................................................................................................................... 14
8.1 Service cable .................................................................................................................................. 14
8.2 Location of the service connector (mini USB type) ......................................................................... 14
8.3 Periodic calibration check of the HC2-S3 probe ............................................................................. 14
8.4 Cleaning or replacing the probe dust filter ...................................................................................... 15
8.5 Validation of the output signals transmission .................................................................................. 15
9 Firmware updates .............................................................................................................................. 15
10 Technical data ................................................................................................................................... 16
10.1 Specifications ................................................................................................................................. 16
10.2 Dew point accuracy ........................................................................................................................ 18
11 Accessories ....................................................................................................................................... 18
12 Supporting documents ..................................................................................................................... 18
13 Document releases ........................................................................................................................... 19
© 2009; Rotronic AG E-M-HM-V1_10
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
Instruction Manual
Page
3 of 19
Document Type
Applicability:
This manual applies to the HygroMet MP probe series with firmware version 1.x, where 1.x can be 1.0, 1.1,
etc. Changes to the last digit of the version number reflect minor firmware changes that do not affect the
manner in which the instrument should be operated.
1 Overview
The HygroMet MP probe uses the digital signals from a HygroClip HC2-S3 digital plug-in probe to measure
humidity and temperature at conditions within the range of 0 to 100 %RH and -40 to 80°C. In addition the
HygroMet MP can be configured to calculate a psychrometric value such as dew point, frost point, enthalpy,
etc. The HygroMet MP operates from a DC voltage source and is designed for use in weather stations where
power is available on a continuous basis.
The HygroClip HC2-S3 digital plug-in probe features the well proven ROTRONIC Hygromer
humidity sensor and a precision Pt100 RTD. Calibration data, sensor characteristics, serial number, etc., are
retained in a non-volatile memory within the probe. The HC2-S3 is fully interchangeable and can be replaced
in seconds without loss of accuracy. As an option, the HygroMet MP probe can be ordered with an additional
fast response temperature probe (Pt100 RTD) that is directly accessible by means of 4-wires.
The HygroMet MP is available in 3-wire circuit type. This version provides two analog output signals
corresponding to any two of the following: relative humidity, temperature or calculated value such as dew
point, enthalpy, mixing ratio, etc. The 3-wire version features a RS-485 interface for the digital transmission of
all 3 signals: relative humidity, temperature and calculated parameter.
Based on the ROTRONIC AirChip 3000 digital technology the combination of HygroMet MP and HC2-S3 2
probe offers the following user functions:
• User configurable settings
• Calculation of psychrometric parameters such as the dew or frost point
• Humidity temperature calibration and adjustment
• Simulator mode
• Automatic humidity sensor test and drift compensation
• Sensor failure mode
• Data recording
The ability for the user to easily update both the HygroMet MP and HygroClip 2 probe firmware means that
both devices can be kept up-to-date regarding any future functionality improvement.
TM
IN1 capacitive
© 2009; Rotronic AG E-M-HM-V1_10
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
2 Mechanical configurat ions and dimensions
HygroMet MP with HC2-S3 probe
HygroMet MP with HC2-S3 probe and additional Pt100 RTD probe
Instruction Manual
Page
4 of 19
Document Type
© 2009; Rotronic AG E-M-HM-V1_10
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
Instruction Manual
Page
5 of 19
Document Type
3 General description
3.1 Power supply
15 to 24 VDC
With both output circuits closed, the maximum current consumption is 50 mA.
Depending on the type of analog output signal, the minimum supply voltage can be reduced as follows:
0…1 V outputs: 5 VDC minimum
0…5 V outputs: 10 VDC minimum
3.2 Measured parameters
The HygroClip HC2-S3 probe used with the HygroMet MP measures relative humidity with a ROTRONIC
Hygromer® IN1 capacitive sensor and temperature with a Pt100 RTD.
3.3 Calculated parameters
Using the ROTRONIC HW4 software, the HygroMet MP can be configured by the user to calculate one of the
following parameters:
o Dew point (Dp) above and below freezing
o Frost point (Fp) below freezing and dew point above freezing
o Wet bulb temperature (Tw)
o Enthalpy (H)
o Vapor concentration (Dv)
o Specifi c humidity (Q)
o Mixing ratio by weight (R)
o Vapor concentration at saturation (Dv s)
o Vapor partial pressure (E)
o Vapor saturation pressure (Ew)
Note: some of the above parameters depend on the value of the barometric pressure. Using the ROTRONIC
HW4 software, a fixed barometric pressure value can be specified. For instructions see the following HW4
manual: E-M-HW4v2-F2-014
© 2009; Rotronic AG E-M-HM-V1_10
E-M-HM-V1_10
Document code Unit
Rotronic AG
Bassersdorf, Switzerland
HygroMet MP Humidit y Temperature
Meteorological Probe: User Guide
Document title
Instruction Manual
Page
6 of 19
Document Type
3.4 Output signals
HygroMet MP: 3-wire version
With the ROTRONIC HW4 software any of the two analog ou tput sign als can be made to correspond to one of
the following:
• Relative humidity
• Temperature
• Calculated parameter
Any output can also be disabled.
The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99. The D/A
converters used to generate the analog output signals feature a 16-bit resolution.
HygroMet MP 3-wire version: this version offers a RS-485 digit al interface in addition to the two analog
output signals. Making use of this interface allows the simultaneous transmission of relative humidity,
temperature and calculated parameter.
3.5 Analog output signal type
The HygroMet MP 3-wire version can be ordered with the following output signal types:
a) Current outputs: 0…20 mA or 4…20 mA
b) Voltage outputs: 0…1 V, 0…5 V or 0…10 V
Note: the analog signal type is configured at the factory and cannot be changed by the user.
3.6 Service connector
The HygroMet MP has an internal service connector (mini-USB type). This connector provides access to the
Hygr oMet MP UART digital interface (Universal As ynchronous Receiver Transmitter) and is used to connect
the HygroMet MP with a service cable to a PC running the ROTRONIC HW4 software. See “Maintenance” for
the location of the service connector and for the type of service cable to be used. The service connector is
used to configure the HygroMet MP and to and update its firmware as necessary.
3.7 Probe
The Hygro Me t MP is normally used with the HC2-S3 probe and is compatible with all available models of
HygroClip 2 probes. For detailed information on the HygroClip 2 probes see document E-M-HC2 Probe s-V1.
4 User configurable setti ngs a nd f unctions
The HygroMet MP ships configured as specified on the customer order. The HygroMet MP can be install ed
and used just as any conventional humidity and temperature probe and most users will never need to use the
HygroMet MP configurable settings and functions. Use of the RS-485 digital interface may require
configuration by the user of the RS-485 network address.
Making use of the HygroMet MP and HC2-S3 probe configurable settings and functions is entirely up to the
user and the appropriate settings depend on the user application. We have provided below a short description
of the HygroMet MP and HC2-S3 and probe functions and also indicated the factory default settings.
© 2009; Rotronic AG E-M-HM-V1_10
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