E-m-pf4-v1_00 – ROTRONIC PF4 User Manual

Page 46

E-M-PF4-V1_00

Rotronic AG

Bassersdorf, Switzerland

Document Code

Unit

PF4 Differential Pressure Transmitter:

Instruction Manual

Document Type

Page 46 of 54

Document Title

E-M-PF4-V1_00

7.3.3

Adjust HC2 Probe

Both the Pt100-RTD temperature sensor used in the probe and the corresponding electronics are very stable

and do not normally need to be calibrated after initial factory calibration.

The long-term stability of the HYGROMER humidity sensor from ROTRONIC is normally better than 1 %RH per

year. For maximum accuracy, it is advisable to check the calibration of the probe every six to 12 months.

Applications in which the probe is exposed to considerable contamination could require more frequent checks.

Temperature Adjustment

The optional keypad of the PF4 enables one-point adjustment of the temperature or humidity in relation to a

reference. A one-point adjustment results in the same offset being added to all measured values.

 When the temperature is stable, press the MENU key to open the internal menu in the display.
 Select

Temperature Adjust

with the (-) key and press ENTER.

 Make sure that the text line beginning with RefValue is selected and press ENTER.
 Change the reference value to the temperature reference value with the (+) or (-) key.
 Move to the text line Adjust with the (-) key and press ENTER.
 The PF4 confirms adjustment with the message "Adjust OK".
 Press the MENU key two times to leave the menu and return the PF4 to normal operation.

Note:

 The following principle applies: perform temperature adjustment before humidity adjustment.
 The calibration point is deleted automatically from the probe memory after adjustment.
 Since the PF4 does not have a real-time clock, the date of the adjustment is not written in the probe. If it

is important to record the adjustment date, use the HW4 software to adjust the probe.