ROTRONIC HF8 - Manual (Page 11)

E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide Instruction Manual
Document Type
Page 11 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
MEASUREMENT LOOP VALIDATION
Function Description
► Simulator mode
Used to make the HF8 generate fixed values for the humidity,
temperature and calculated parameter. Can be configured,
enabled or disabled
DEVICE SAFEGUARDS
Function Description
► Device write protection
Used to protect the HF8 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 HF8 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
Function 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
This HF8 function is used to specify the normal range for
humidity, temperature and the calculated parameter depending
on the user application. Can be configured, enabled or disabled
for each probe input. The out-of-limits alarm function controls
the operation of the optional relay outputs.
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 HF8 display provided
that the HF8 is set to monitor probe alarms
► Fail safe mode
This HF8 and probe function is used to specify a "safe" fixed
value for humidity and for temperature in the event of:
o
Loss of communication with the probe (HF8 function)
o Sensor failure (probe function)
Can be configured, enabled or disabled
4.2 Interaction between the HF8 and HygroClip 2 probe functions
It is important to note that when used together, the HF8 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.
The functions and settings of the HF8 transmitter and HygroClip 2 probe (HC2) operate together as indicated
below: