Hanna Instruments HI 98150N - Manual (Page 9)

9
The LCD will show the pH measurement
together with the temperature of the
sample. In order to take more accurate
pH measurements, make sure that the
electrode and instrument is calibrated (see
page 11 for details).
Hanna recommends to keep the pH electrode wet and to rinse throughly
with the sample before measurements.
The pH reading is directly affected by temperature. In order for the
instrument to measure the pH accurately, temperature must be taken
into consideration. If the sample temperature is different from the
ambient temperature, allow a few minutes for the pH electrode to reach
thermal equilibrium.
The
HI 1618D pH sensor contains an integral temperature sensor so the
pH reading is automatically temperature compensated (ATC) on the
HI 98140 and HI 98150. If the temperature is out of range (due to
temperature sensor failure) these instruments will enter MTC mode and
permit temperature values to be set manually using the
ARROW keys.
To use the instrument's Automatic Temperature Compensation feature for
HI 98160, connect and submerse the temperature probe into the sample
as close to the electrode as possible and wait for a few seconds.
If manual temperature compensation (MTC) is desired, the
temperature probe must be disconnected from the instrument
(HI 98160 only).
The display will show the default temperature
of 25 ºC, the last measured temperature
reading, or the last set temperature, with
the “
ºC” (or “ºF”) tag blinking.
The “ MTC” tag and arrow symbols
light up on the LCD to indicate that the
instrument is in MTC mode and the arrow
keys can be used to enter the desired temperature value.
Note: When in MTC the user can press and hold the ARROW keys to
set the measurement temperature. The instrument will start
incrementing/decrementing the temperature value. The instrument
keeps measuring using the MTC value for temperature compensated
pH and the display is updated.
ORP MEASUREMENTS (HI 98150 & HI 98160 only)
To perform ORP measurements, connect an optional
ORP electrode (see Accessories section) to the instrument
and turn it ON. If necessary, enter the mV mode by
pressing
Range until the display changes to mV.
3cm
(1¼”)