ROTRONIC HF8 - Manual (Page 12)

E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide Instruction Manual
Document Type
Page 12 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
Function / Setting HF8 HC2 Notes
Device protection X X Individual to the HF8 and HC2 probe
RS-485 address X X Individual to the HF8 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 HF8 Input Name
Calculation X X
Psychrometric calculation
HF8 setting overrides HC2 probe setting
Simulator function X X
Generates fixed humidity and / or temperature value
When enabled, the HF8 settings override the HC2 probe settings
Unit system X X
The HF8 setting overrides HC2 probe setting. 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 HF8 and probe.
Out-of-limits value alarm X X
The HF8 settings are independent from the HC2 probe settings.
The HC2 probe settings have no effect on the HF8 and out-of-limits
values defined at the probe level do not generate a HF8 alarm.
RH sensor test X
The RH sensor is tested according to the time interval specified for
the probe (HW4 Device Manager)
Analog outputs X
Parameter and scale
The HC2 probe settings have no effect on the HF8
4.3 Configuration of the analog output signal type
The type of analog output signals generated by the HF8 can be configured with the ROTRONIC HW4
software after connecting the HF8 with a service cable to a PC running HW4.
See document E-M-HW4v3-F2-015
5 Mechanical installation
5.1 General guidelines
Relative humidity is extremely dependent on temperature. Proper measurement of relative humidity requires
that the probe and its sensors be at exactly the temperature of the environment to be measured. Because of
this, the location where you choose to install the probe can have a significant effect on the performance of the
instrument. The following guidelines should guarantee good instrument performance:
a) Select a representative location: install the probe where humidity, temperature and pressure
conditions are representative of the environment to be measured.
b) Provide good air movement at the probe: air velocity of at least 200 ft/ minute (1 meter/second)
facilitates adaptation of the probe to changing temperature.
c) Avoid the following: (1) Close proximity of the probe to a heating element, a cooling coil, a cold or
hot wall, direct exposure to sun rays, etc. (2) Close proximity of the probe to a steam injector,
humidifier, direct exposure to precipitation, etc. (3) Unstable pressure conditions resulting from
excessive air turbulence.