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

Page 47

E-M-PF4-V1_00

Rotronic AG

Bassersdorf, Switzerland

Document Code

Unit

PF4 Differential Pressure Transmitter:

Instruction Manual

Document Type

Page 47 of 54

Document Title

E-M-PF4-V1_00

Humidity Adjustment

The keypad of the PF4 enables multi-point adjustment of the humidity. The effect of a humidity adjustment

differs in dependence on the number of calibration points entered into the probe memory before adjustment:

 One calibration point adds an offset to all measured values.
 Two calibration points influence the offset and gain of the measurement curve.
 Three or more calibration points influence the offset, gain and linearity of the measurement curve.

For maximum accuracy, three to four calibration points distributed over the measurement range in question

should be used. The calibration points (maximum 100) can be entered in any order, but we recommend working

from low humidity values to high humidity values.

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

Humidity 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 reference humidity with the (+) or (-) key.
 Move to the text line Acquire with the (-) key and press ENTER.
 Note that the counter "Acquired" will be increased by 1 (number of calibration points in probe memory).
 When all calibration points have been acquired, move to the text line Adjust with the (-) key and press

ENTER. Only adjust the probe when all calibration points have been acquired.

 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.