ROTRONIC HF7 - Manual (Page 18)

E-M-HF7-V1_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF7 Humidity Temperature
Transmitters: User Guide Instruction Manual
Document Type
Page 18 of 23
Document title
© 2009-2011; Rotronic AG E-M-HF7-V1_24
8.3 Periodic calibration check
Both the Pt 100 RTD temperature sensor and associated electronics are very stable and should not
require any calibration after the initial factory adjustment.
Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year.
For maximum accuracy, calibration of the HF7 should be verified every 6 to 12 months. Applications
where the HF7 is exposed to significant pollution may require more frequent verifications.
Procedure for adjusting the HF7 with the ROTRONIC HW4 software:
o Use the appropriate model of service cable (see Maintenance > Service Cable) to connect the
service connector of the HF7 to a USB port of a PC with the HW4 software installed. Note that the
ROTRONIC USB driver must be installed on the PC as explained in the HW4 manual E-M-HW4v3-
Main.
o Start HW4 on the PC and search for the HF7 (HW4 Main Menu Bar > Devices and Groups > Search
for USB Masters).
o After finding the HF7 with HW4, expand the device tree to see the HF7 functions.
Select Probe Adjustment. Instructions for using the ROTRONIC calibration devices and humidity
standards are provided in document E-M-CalBasics
o For further instructions see HW4 manual E-M-HW4v3-A2-001
8.4 Cleaning or replacing the dust filter
Depending on the conditions of measurement, the filter should be checked from time to time. Corroded,
discolored or clogged filters should be replaced.
The probe of the HF7 has a removable filter cartridge. Simply replace the cartridge (leave the metal base on
the probe).
8.5 Validation of the output signals transmission
If so desired, transmission of the HF7 output signals can be validated by using the simulator function. The
HW4 software is required to enable and configure this function. When this function is enabled the HF7
generates fixed digital and analog signals as specified by the user. For instructions see document
E-M-HW4v3-F2-007