HTA 77596, Operation Manual, Page: 18 / 28

CAL
17
“CAL” and calibrating value (75.3% if at
o
25 C) are blinking on the LCD.
Meter is now calibrating, and will finish
in about 60 minutes when “CAL” and
humidity stop blinking. To abort the cali-
bration, turn off the meter at any time.
%rh %rh
Fig.35
CO CALIBRATION
CAUTION:
Do not calibrate the meter in the air
with unknown CO concentration.
Otherwise, it will be calibrated as
0 or 400ppm by default and leads to
inaccurate measurements.
When the accuracy becomes a concern
after a long time usage, return to dealers
for standard calibration. It is necessary
to have standard CO gas for calibration.
Place the meter in the calibration site.
First press + , then also
simultaneously for 3 seconds to turn on
the meter and enter calibration mode
(Fig.33).
Press or to select the CO
0ppm or 400ppm calibration. ppm and
“ “ icon are blinking on the LCD.
Press to start calibration.
(Fig.36&37)
Wait about 10 minutes until the blinking
stops and the calibration is completed
automatically. To abort the calibration,
turn off the meter at any time.
START
ESC
MEM
SET
ON/OFF
HOLD
MEM
N
X
M /AVG
CAL