ROTRONIC HF5 - Manual (Page 11)

E-M-HF5-V2_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF5 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 11 of 36
Document title
© 2009-2013; Rotronic AG E-M-HF5-V2_12
Function / Setting HF5 HC2 Notes
Out-of-limits value alarm X X
The HF5 settings are independent from the HC2 probe settings.
The HC2 probe settings have an effect only when the HF5 is
enabled to monitor alarms generated by the probe
When out-of-limit values have been defined for the same parameter
for both the HF5 and probe, any alarm is triggered based on the
narrowest set of limits (assuming that the HF5 has been set to
monitor probe alarms).
Analog outputs X X
Parameter and scale
The HC2 probe settings have no effect on the HF5
4.3 Analog output signal type (except HF52)
Both analog outputs of the HF5 provide the same type of signal. With the exception of the HF52 (always
4…20 mA), the type of signal can be selected with the ROTRONIC HW4 software to any of the following:
0…20 mA, 4…20 mA, 0…1V, 0…5V or 0…10V. To select the analog signal type proceed as follows:
Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the
service connector of the HF5 to a USB port of a PC with the HW4 software installed (HW4 3.0.0 or
higher). Note that the ROTRONIC USB driver must be installed on the PC as explained in the HW4
manual E-M-HW4v3-Main
Start HW4 on the PC and search for the HF5 (HW4 Main Menu Bar > Devices and Groups > Search
for USB Masters).
After finding the HF5 with HW4, expand the device tree to see the HF5 functions. Select Device
Manager.
For further instructions see HW4 manual E-M-HW4v3-F2-005
No adjustment is required after changing the type of output signal.
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.
d) Immerse as much of the probe as possible in the environment to be measured.