ROTRONIC HF5 - Manual (Page 9)

E-M-HF5-V1_25
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF5 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 9 of 30
Document title
© 2009-2013; Rotronic AG E-M-HF5-V1_25
DEVICE SAFEGUARDS
Functions Description
► Device write protection Used to protect the HF5 with a password to prevent
unauthorized digital access by a digital user. Can be configured,
enabled or disabled
► Internal menu access from keypad Used to prevent accidental changes to the HF5 settings and
temperature-humidity adjustment by disabling the MENU key on
the optional keypad. Can be enabled or disabled
PROCESS PROTECTION AND PROTECTION OF OTHER DEVICES
AirChip 3000 Functions Description
► Limit humidity output to 100 %RH This probe function is used to prevent the humidity signal from
exceeding 100 %RH when condensation forms on the sensor.
Can be enabled or disabled
► Out-of-limit value alarm Used to specify the normal range for humidity, temperature and
the calculated parameter depending on the user application.
Can be configured, enabled or disabled
Out-of-limit values trigger a digital alarm which can be also be
seen on the optional display
► Bad sensor alarm This is a built-in probe function. Cannot be disabled
A bad humidity or temperature sensor triggers a digital alarm
which can be also be seen on the optional HF5 display provided
that the HF5 is set to monitor probe alarms
► Fail safe mode Used to specify a "safe" fixed value for humidity and for
temperature (HF5 or probe) in the event of:
o Loss of communication with the probe (HF5 function)
o Sensor failure (probe function)
Can be configured, enabled or disabled
4.2 Interaction between the HF5 and probe functions
It is important to note that when used together, the HF5 transmitter and HC2 probe (HygroClip 2) constitute a
2-component system. Each system component has its own microprocessor, firmware and functions. Some of
these functions are unique to each system component. Other functions are found in both components.
HF52 (2-wire, loop powered transmitter): due to the necessity of limiting the current consumption of the
combination of HF52 and HC2 probe to less than 4 mA, several probe functions such as RH sensor test, data
recording and probe adjustment are not available with the HF52.
The functions and settings of the HF5 transmitter and HygroClip 2 probe (HC2) operate together as indicated
below:
Function / Setting HF5 HC2 Notes
Device protection X X Individual to the HF5 and HC2 probe
RS-485 address X X Individual to the HF5 and HC2 probe