PH220A EXTECH [Extech Instruments Corporation.], PH220A Datasheet - Page 6

• Manufacturer Part Number: PH220A
• Description: Waterproof Palm pH Meter
• Manufacturer: EXTECH [Extech Instruments Corporation.]

Storing and Recalling Readings
Temperature Offset Adjustment
This instrument has the ability to store up to 25 measurement readings. At a later time the
readings can be recalled and viewed. Readings are saved even after the instrument has
been turned off.
STORE Readings
The steps below cover the STORE process in detail:
1.
2.
3.
4.
5.
RECALL Readings
The steps below cover the RECALL process in detail:
1.
2.
3.
4.
5.
ERASE Readings
The steps below cover the ERASE (CLEAR) process in detail:
1.
2.
3.
Applications may arise where it is desirable to offset the instrument’s temperature display.
This instrument allows a temperature display offset adjustment of ±9
follow the steps below:
1.
2.
3.
4.
5.
Take a measurement as described earlier in this manual.
Momentarily press the STORE/RECALL button to save the reading. The reading will
be held on the display (the HOLD and STORE icons will appear). In addition, the
storage location (1 to 25) will briefly appear on the lower portion of the LCD.
Note: The temperature reading associated with the pH reading is also saved.
Press the STORE/RECALL button again to release the ‘hold’ feature. The instrument
will then return to normal operation.
Note that when all 25 storage locations are filled the instrument begins writing over
the previously stored data.
Press and hold the STORE/RECALL button until a number appears on the main
display. This number is the storage location for the most recent reading.
The number will switch off after 1 second and the stored reading will appear. The
RECALL icon will appear and remain on the entire time the recall mode is accessed.
While in the RECALL mode, use the STORE/RECALL button to scroll through the
stored readings. The most recent readings will show first (LAST IN – FIRST OUT).
Press and hold the STORE/RECALL button until the END display appears. Release
the button and the instrument will return to normal operation mode.
Note that if there are no readings in memory, the display will show END when the
user attempts to access the RECALL mode.
Press and hold STORE/RECALL and the CAL buttons simultaneously for 4 seconds.
The ‘CLr’ display will appear indicating that all readings have been erased.
Release the buttons to return to normal operation mode.
Press and hold the CAL, MODE, and STORE/RECALL buttons simultaneously for 6
seconds.
The main display will indicate the current offset. The lower display will show ‘t_O’.
Use the CAL button to decrease the offset value and the MODE button to increase it.
Press and hold the STORE/RECALL button for 2 seconds to exit this mode. The
instrument will display ‘SA’ (save) and ‘END’ before returning to the normal operation
mode.
The temperature display will now indicate the actual temperature ± the offset value.
6
Model PH220 Version 3.1 11/2005
o
F (±5
o
C). To do so,