ROTRONIC HP22A - Manual (Page 13)

E-M-HP22-V2_13
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroPalm HP22-A hand-held indicator:
User Guide
Instruction Manual
Document Type
Page 13 of 16
Document title
© 2010-2012; Rotronic AG E-M-HP22-V2_13
Humidity adjustment
The keypad of the HP22 allows a multi-point adjustment of humidity. The effect of a humidity adjustment
depends on the number of calibration points present in the probe memory prior to the adjustment:
- one calibration point: offset added to all measured values
- two calibration points: offset and slope
- three or more calibration points: offset, slope, linearity
For maximum accuracy use at least 3 to 4 calibration points distributed equally across the measurement
range of interest. The calibration points (maximum 100) can be acquired in any order but we recommend
going from low humidity values to high humidity values.
• When humidity is stable, press the MENU key to show the internal menu on the display
• Use the (-) key to select Humidity 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 to match the reference humidity
• Use the (-) key to highlight the Acquire text line and press the ENTER key
• Note that the “Acquired” counter is incremented by 1 (number of calibration points in the probe
memory)
• When all calibration points have been acquired, use the (-) key to highlight the Adjust text line and
press the ENTER key. Do not adjust the probe before having acquired all calibration points.
• The HP22 confirms the adjustment with the message “Adjust OK”
• Press the MENU key twice to exit the menu and return the HP22 to normal operation
Notes:
o
All calibration points are automatically deleted from the probe memory after an adjustment
o Instructions for using the ROTRONIC calibration devices and humidity standards are provided in
document E-M-CalBasics
o Because the HP22 has no real time clock, the date of the adjustment is not written to the probe. If
retaining the adjustment date is important, use the HW4 software to adjust the probe.
b) Using the HW4 software to adjust the probe connected to the HP22:
• Use cable AC3006 to connect the service connector of the HP22 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.
• Start HW4 on the PC and search for the HP22 (HW4 Main Menu Bar > Devices and Groups >
Search for USB Masters).
• After finding the HP22 with HW4, expand the device tree to see the HP22 functions. Select Probe
and Probe Adjustment.
• For further instructions see HW4 manual E-M-HW4v3-A2-001
5.5 Cleaning or replacing the probe dust filter
See document E-M-HC2 Probes-V1