Owner's manual

E-M-HM-V1_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide
Instruction Manual
Document Type
Page
13 of 19
Document title
© 2009; Rotronic AG E-M-HM-V1_10
Wiring color code
Measuring humidity or temperature only
Operation of the HygroMet MP does not require both current loops to be closed. When using the HygroMet
MP to measure either humidity only or temperature only, close only the loop that is being used.
Using the ROTRONIC HW4 software, any unused output of the HygroMet MP can be disabled.
6.4.1 Grounding (all models)
Operation of the HygroMet MP does not require that the unit be electrically grounded. However, we
strongly recommend connecting to an earth ground the (-) side of the supply voltage to the probe.
7 Operation
7.1 Analog outputs
Use the HW4 software to configure the HygroMet MP as desired, complete the mechanical and electrical
installation, make the electrical connections probe and simply power up the HygroMet MP.
7.2 RS-485 serial interface
Instructions for using the HygroMet MP with a RS-485 network are provided in the following manuals:
E-M-HW4v2-Main (§ 6.5), E-M-HW4v2-F2-014 and E-DV04-RS485.01.
Notes:
Wire color
Description
Gray Power ground
Green Power supply (+) 5…24 VDC (depends on output signal type)
White – no label
Output 1 (+) – default: relative humidity or calculated
parameter
White – labeled 2 Output 1 (-) – A-GND 1
Brown Output 2 (+) – default: temperature
Pink Output 2 (-) – A-GND 2
Red RS485 (RXD)
Blue RS485 (TXD)
Black Optional: additional Pt100 RTD probe – PT S
Purple Optional: additional Pt100 RTD probe – PT AS
Orange Optional: additional Pt100 RTD probe – PT R
Yellow Optional: additional Pt100 RTD probe – PT AR
Cable shield
Drain – should be connected to power supply (-) or to an
earth ground