User Guide

5150
PROGRAM # 8
To display or set Fert 1/2 calibration factor
A. To display the Fert 2 calibration factor
• Press PGM
• Press 8
• Press ENTER. "P 8" and the current fertil-
izer calibration factor will respectively ap-
pear on the TEMP. and on the primary
LCD. The secondary display will show "2"
for Fertilizer #2
B. To change the fertilizer #:
• Press the PGM key again
• Press 8 again
• Press the ENTER key. "P 8" and the
current fertilizer calibration factor will re-
spectively appear on the TEMP. and on
the primary LCD. The secondary display
will show "1" for Fertilizer #1
C. To set the Fert 1 calibration factor:
e.g. CAL factor 0.999
• Press CAL and the current setting will
blink on the primary LCD
• Press .
• Press 9
• Press 9
• Press 9 and "0.999" will blink on the pri-
mary LCD
• Press the ENTER key. "0.999" stays still
and the "CON" symbol will blink
• Press the CON key to confirm and the
"CON" symbol will disappear
Note: To quit from the setting mode, press
the CAL key.
B. Setting the conductivity calibration factor
e.g. CAL factor is 0.999
• Press the CAL key and the current calibra-
tion factor will blink on the primary LCD
• Press .
• Press 9
• Press 9
• Press 9. "0.999" and "CAL" symbol will
blink on the large LCD
• Press ENTER. "0.999" will be fixed on
large LCD with the "CON" symbol will be
blinking
• Press the CON key
Note: To quit from the setting mode, press
the CAL key.
This program provides a fast way to perform
the calibration (without going through the cali-
bration procedure) based on the formula:
KCond = (CALBUF * (1 + TC (TP - 25 )) / Gt
where:
CALBUF = calibrated buffer solution
Gt = measured solution conductivity at Tp
TC = temperature coefficient
TP = sample temperature in °C
e.g. The buffer value is 1000 µS/cm, but the
meter shows 900 µS/cm, so by chang-
ing the KCond to 1.111, the meter will
then show 1000 µS/cm and the meter
is calibrated.
* calibration factor value range: 0.850 - 1.150
To return to normal operation:
• Press the PGM key
• Press 0
• Press the ENTER key.