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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
9 of 16
Document title
© 2010-2012; Rotronic AG E-M-HP22-V2_13
4.4 ON/OFF key
The ON/OFF key is used as follows:
o To turn the instrument on: press the ON/OFF key
o To turn the instrument off: press the ON/OFF key for more than 1 second
o To activate the HOLD function: press the ON/OFF key briefly (less than 1 second)
o To deactivate the HOLD function: press the ON/OFF key briefly (less than 1 second)
4.5 Changing the parameters shown on the display
When the menu is not active, press the ENTER key to change which parameters are shown on the display:
o Relative humidity and temperature
o Relative humidity, temperature and calculated parameter (when calculated parameter is enabled)
4.6 HOLD function
When the HOLD function is active, the word “HOLD” appears at the bottom of the LC display. The display is
frozen and shows the values that were either last measured or last calculated at the time the ON/OFF key was
pressed. Likewise, communication with the ROTRONIC HW4 software is frozen. The ENTER key can still be
used to change the parameters shown on the display, but the values are not updated.
The HOLD function is automatically disabled whenever the instrument is turned off. The values that were
displayed while the HOLD function was active are not memorized and are lost.
WARNING: while the HOLD function is active, functions such as probe adjustment from the keypad should not
be used because both the measured and calculated values are no longer updated.
4.7 Changing the unit system
The unit system (metric or English) can be changed from the keypad (Menu > Settings > Unit).
• Press the MENU key to show the internal menu on the display
• With the menu item Settings highlighted, press the ENTER key
• With the menu item Unit highlighted, press the ENTER key
• Use the UP or DOWN key to change the unit system as desired
• Press the MENU key twice to exit the menu and return the HP22 to normal operation
The optional HW4 software can also be used to change the unit system.
4.8 Low battery indicator
When the battery is down to about 20% of its initial charge, “Low Battery” appears at the bottom of the display.