7
In order to take more accurate pH measurements, make sure that the
instrument is calibrated (see page 9 for details).
It is recommended that the electrode is always kept wet and rinsed
thoroughly with the sample to be measured before use.
The pH reading is directly affected by temperature. In order for the
meter to measure the pH accurately, temperature must be taken into
consideration. If the sample temperature is different from the tempera-
ture at which the pH electrode was kept, allow a few minutes to reach
thermal equilibrium.
To use the meter's Automatic Temperature Compensation feature,
submerge the temperature probe into the sample as close to the
electrode as possible and wait for a few minutes.
If manual temperature compensation (MTC) is desired, the
temperature probe must be disconnected from the instrument
.
The display will show the default temperature
of 25 °C or the last temperature set with the
"°C" (or "°F") indicator blinking.
The MTC tag and up & down arrows symbols light up on the LCD to
indicate that the meter 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, and
the meter will start incrementing/decrementing the temperature
value. The meter keeps measuring and the display is updated
every second.
ORP MEASUREMENTS
To perform ORP measurements, connect an optional ORP electrode
(see "Accessories" section) to the meter and turn it ON.
If necessary, enter the "mV" mode by pressing RANGE until the
display changes to mV.
Submerge the ORP electrode tip (4cm/1½") into the sample to be
tested and wait a few minutes for the reading to stabilize.
Measurements within the ±699.9 mV range are displayed with 0.1
mV resolution, while outside this range the resolution automatically
switches to 1 mV.
The ATC (or MTC) tag is turned off because mV readings are not
temperature compensated.
22
pH ELECTRODES
All electrodes part numbers ending in B are supplied with a BNC
connector and 1 m (3.3') cable, as shown below:
HI 1043B
Glass-body, double junction, refillable, combination
pH
electrode.
Use: strong acid/alkali.
HI 1053B
Glass-body, triple ceramic, conic shape, refillable, combination
pH
electrode.
Use: emulsions.
HI 1083B
Glass-body, micro, Viscolene, non-refillable, combination
pH
electrode.
Use: biotechnology, micro titration.
HI 1131B
Glass-body, single junction, refillable, combination
pH
electrode.
Use: general purpose.
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
HI 1040
"S" VERSION
HI 1043
120 mm
4.7"
12 mm
0.5"
HI 1050
"S" VERSION
HI 1053
120 mm
4.7"
12 mm
0.5"
5 mm
0.2"
3 mm
0.12"
3.0 mm DIA
0.12"
HI 1083
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
HI 1111
"S" VERSION
HI 1131
ORP SOLUTIONS
HI 7020L
Test Solution 200-275 mV, 500 mL bottle
HI 7020M
Test Solution 200-275 mV, 230 mL bottle
HI 7021L
Test Solution 240 mV, 500 mL bottle
HI 7021M
Test Solution 240 mV, 230 mL bottle