23
• If the value is out of the slope range, an
"
E1
" error message will appear on the
secondary display. Press the CAL key to
re-calibrate the value.
• If everything is satisfac-
tory the LCD will blink
"
1413
µS", expecting
the next calibration so-
lution (HI 7031 or
HI 8031).
• Wait for 1 minute, then
immerse the probe into
the HI7031/HI 8031 cali-
bration solution. The
level of solution must be
higher than the holes on the PVC sleeve.
Tap the probe repeatedly on the bottom of
the beaker and stir it to ensure that no air
bubbles are trapped inside the sleeve.
• When the "
1413
µS" stops blinking, indi-
cating that the measurement has stabi-
lized, press the CFM key again to confirm
the third calibration point.
• If the value is out of the slope range, an
"
E2
" error message will appear on the
secondary display. Press the CAL key to
re-calibrate the value.
CAL
µS
8 cm
(3¼")
HI 7031
CFM
µS
CAL
