Display option, Service connector, E-m-hf7-v1_24 – ROTRONIC HF7 User Manual
Page 6: 5 display option, 6 service connector
E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide
Instruction Manual
Document Type
Page 6 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
Signal type
Maximum offset at range bottom
0…1 V
3 mV
0…5 V
50 mV
0…10 V
90 mV
0…20 mA
4 µA
4…20 mA
No offset
HF73
The ROTRONIC HW4 software allows changing the type of output signal to one
of the following: 0…20 mA,
4…20 mA, 0…1V, 0…5V or 0…10V. Both output signals are automatically configured with the same signal
type. No calibration or adjustment is required after changing the type of output signal.
In the case of voltage output signals, load requirements apply to the external device or circuit connected to the
HF7
3 transmitter. These requirements are defined in the “Operation” chapter
3.5 Display option
The upper line of the display corresponds to relative humidity or dew / frost
point and the bottom line corresponds to temperature.
The display can be configured to show a trend indicator on each line:
▲: increasing value
▼: decreasing value
In the event of an alarm the display shows the symbol [ ! ] to the right of the value. For instructions see the
following HW4 manual: E-M-HW4v3-F2-007.
The display option for the HF73 has a backlight. The display option for the HF72 does not have a backlight
3.6 Service connector
The service connector is a UART digital interface (Universal Asynchronous Receiver Transmitter) with a mini-
USB type connector. This allows connecting the HF7 either to a PC running the ROTRONIC HW4 software or
to a probe input of another instrument that is compatible with the HygroClip 2 (HC2) probes. In both cases a
service cable is required.
See “Maintenance” for the location of the service connector and for the type of
service cable to be used.
Connecting the HF7 to a PC is used to configure the HF7, gain access to the HF7 functions such as
humidity and temperature adjustment, read data from the HF7 on the PC and update the AirChip 3000
firmware.
Connecting the HF7 to the probe input of another instrument is useful only when the other instrument has
its own display and keypad, and has an internal menu equivalent to the menu of the HP23 hand-held
calibrator. The connection allows showing the data measured by the HF7 on the other instrument display
and also allows using the other instrument internal menu to do for example a humidity and temperature
adjustment of the HF7.