ROTRONIC HygroMet MP402H - Manual (Page 10)

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 10 of 20
Document title
© 2009-2011; Rotronic AG E-M-HM-V1_12
Function / Setting HM HC2 Notes
Data refresh rate X
This setting has no effect on the HygroMet and probe. Depending
on the model, the data refresh rate is as follows:
HygroMet 2-wire: typically 5 s
HygroMet 3-wire: typically 1 s
Simulator function X X
Generates fixed humidity and / or temperature value
When enabled, the HygroMet settings override the HC2 probe
settings
Unit system X X
The HygroMet setting overrides HC2 probe setting regarding the
HygroMet signals. The HC2 probe settings still apply when the
probe is used alone
Make sure to use the same humidity symbol and the same
temperature unit for both the HygroMet and probe.
Out-of-limits value alarm X X
The HygroMet settings are independent from the HC2 probe
settings.
The HC2 probe settings have an effect only when the HygroMet is
enabled to monitor alarms generated by the probe
When out-of-limit values have been defined for the same parameter
for both the HygroMet and probe, any alarm is triggered based on
the narrowest set of limits (assuming that the HygroMet has been
set to monitor probe alarms).
Analog outputs X X
Parameter and scale
The HC2 probe settings have no effect on the HygroMet
5 Mechanical installation
5.1 General guidelines
Install the HygroMet MP so that the local conditions at the sensors are typical of the environment to be
measured:
a) Use either a shield or a shelter to protect the probe and sensors from direct exposure to solar
radiation and precipitation. Several shields are available from ROTRONIC (see specifications).
b) In an open field, install the probe at least 6.6 feet (two meters) above ground. Increase this
distance if the ground surface is concrete or black top (such as above a roof).
6 Electrical installation
6.1 General wiring guidelines
Power supply wiring
Heavy machinery and instrumentation should not share the same power supply wiring. If this cannot be
avoided, noise filters and surge protectors should be used. Most UPS devices have those features already
integrated.