ROTRONIC HF62 - Manual (Page 18)

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 18 of 27
© 2008; Rotronic AG E-M-HF62-V1_11
8.2 Location of circuit 1 (humidity) service connector
The service connector (mini-USB type) can be accessed without opening the enclosure after removing the
small red sealing cover.
HF32
The service connector is located at
the bottom of the enclosure (black
arrow)
8.3 Periodic calibration check
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.
8.3.1 Circuit 1 (humidity):
Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1 %RH per year. For
maximum accuracy, calibration of the HF62 should be verified every 6 to 12 months. Applications where the
probe of the HF62 is exposed to significant pollution may require more frequent verifications.
a) Procedure for adjusting circuit 1 of the HF62 from the optional keypad
The optional keypad of the HF62 allows a 1-point adjustment of temperature (see note below)
or humidity
against a reference. A 1-point adjustment has the effect of adding the same offset to all measured values. A
multi-point adjustment is not possible from the keypad and requires using either a PC with the HW4 software
installed or another instrument such as the HP23 hand-held calibrator.
Note: this is the temperature value measured by the Pt100 RTD used by circuit 1 to compensate the
effect of temperature on the humidity sensor. This should not be confused with the temperature value
measured independently by circuit 2 of the HF62.
 When the parameter to be adjusted is stable, press the MENU key to show the internal menu on the
display
 Use the (-) key to select either H-Adjust or T-Adjust and press the ENTER key
 Make sure that the text line beginning with RefValue is highlighted and press the ENTER key
 Use the (+) or (-) key to change the reference value as desired
 Use the (-) key to highlight the Adjust text line and press the ENTER key
 The HF62 confirms the adjustment with the message “Adjust OK”
 Press the MENU key twice to exit the menu and return the HF62 to normal operation