14
The
HI98193
meter contains a built‑in barometer, and it is able to automatically compensate for
changes in barometric pressure. If another pressure value than the barometer’s reading is to be used,
then the manual pressure feature must be enabled from the SETUP menu (see page 30), and afterwards
the pressure value can be set using the
/
keys.
The table below contains a conversion altitude (m) to pressure (mmHg) for the altitude values from
the previous table.
DO MEASUREMENTS
Make sure the probe’s protective cap has been removed.
In order to take accurate dissolved oxygen measurements make sure that the instrument has been
calibrated (see page 25 for details).
Press
RANGE
to access the DO measure screen. If necessary press
MODE
to change the measuring unit.
Immerse the tip of the probe into the sample to be tested. Allow approximately one minute for the
reading to stabilize (hourglass symbol turns off).
On the screen are displayed:
•
Dissolved Oxygen reading in the selected unit (% saturation or mg/L)
•
Temperature reading in the selected unit (°C or °F)
•
Pressure reading in the selected unit (mmHg, inHg, atm, psi, kPa, mbar). If the Manual Pressure
option is enabled ( displayed in front of the pressure value) the pressure value can be changed
using the / keys.
For accurate dissolved oxygen measurements, a water movement of 0.3 m/s is required. This is to
ensure that the oxygen‑depleted membrane surface is constantly replenished. A moving stream will
provide adequate circulation.
Altitude
0
300 600 900 1200 1500 1800 2100 2400 2700 3000 3300 3600 3900 4000
Pressure
760 732 705 679
654
630
607
584
563
542
522
503
484
467
461
Altitude (m)
Pressure (mmHg)
OPERA
TIONAL GUIDE
www.tools.in.th
www.neonics.co.th