ROTRONIC HF62 - Manual (Page 8)

E-M-HF62-V1_11
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroFlex HF62 Humidity Temperature
Transmitters: User Guide
Document title
Page 8 of 27
© 2008; Rotronic AG E-M-HF62-V1_11
3.5 Service connectors
The HF62 consists of two fully independent measuring circuits and the HF62 has two separate mini-USB type
service connectors, each corresponding to a separate UART interface.
Circuit 1 (humidity):
The service connector of circuit 1 can be accessed without opening the enclosure and allows connecting the
HF62 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 this service connector and for the type of service cable to be used.
Circuit 2 (temperature):
Both the Pt 100 RTD temperature sensor and associated electronics used by circuit 2 are very stable
and should not require any adjustment after the initial factory adjustment. The service connector of
circuit 2 is not designed to be accessed by the user and is located inside the enclosure on the PCB
mounted inside the gray top-half of the enclosure.
3.6 Sensor protection (dust filter)
The probe of the HF62 requires a filter to protect the sensors against dust particles and high air velocity.
Wall mount models
: the probe of the HF62 is equipped with a slotted cap with a Polyethylene insert
Duct mount and cable probe models
: the probe of the HF62 is equipped with a with a metal filter base
mod. NSP-ME. The filter cartridge must be ordered separately (see Accessories 11.6). Filter cartridge mod.
SP-M15 is suitable for most applications.
3.7 Direct RTD option
As an option, the HF62 can be ordered with the Pt100 RTD normally used by measuring circuit 2 directly
connected by 4-wires to a terminal block located on the transmitter PCB. In this case, the electronics of the
HF62 consist of just one circuit corresponding to humidity.
4 User configurable settings and functions
The HF62 ships configured as specified on the customer order. Models with analog outputs can be installed
and used just as any conventional humidity and temperature transmitter and most users will never need to use
the HF62 configurable settings and functions. Models with a digital interface generally require some
configuration by the user.
Making use of the HF62 configurable settings and functions is entirely up to the user and the appropriate
settings depend on the user application. We have provided below a short description of the HF62 functions
and also indicated the factory default settings.
IMPORTANT
: the HF62 functions are limited to circuit 1 only (humidity and temperature measured by
the Pt100 RTD used to compensate the humidity sensor).