User Guide

8
Procedure:
• Disconnect the +ve supply cable from
"+VE LOOP" terminal and connect a
20mA f.s. ammeter between the +ve
cable and "+VE LOOP" terminal.
• Remove the protective cap
from the electrode, rinse it
with some pH 7.01 solution
or immerse it in the pH 7
rinse solution, then im-
merse the pH electrode and
temperature probe into
pH 7.01 calibration buffer
solution; shake briefly and
wait for the reading to sta-
bilize.
Note: the tip of the elec-
trode should be sub-
merged approxi-
mately 4 cm (1½")
into the solution. The
temperature probe
should be located as
close to the pH elec-
trode as possible.
• Adjust the offset trimmer until the am-
meter reads 12mA or the display shows
"7.01" (HI 8614L only) if the temperature
of the buffer is at 25°C.
HI 7007
4 cm
1½"
mA
SLOPE ADJUSTMENT
OFFSET ADJUSTMENT