ROTRONIC HygroMet MP402H - Manual (Page 3)

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 3 of 20
Document title
© 2009-2011; Rotronic AG E-M-HM-V1_12
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
TM IN1 capacitive
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 two basic versions: 2-wire loop powered circuit type or 3-wire circuit type.
Both versions provide 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 1)
• Simulator mode
• Automatic humidity sensor test and drift compensation 1)
• Sensor failure mode 1)
• Data recording 1)
1) Except 2-wire loop powered version of the HygroMet MP
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.