1312
3 cm
3 cm
ORP MEASUREMENTS
To perform ORP measurements, connect an 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.
Submerse the ORP electrode 3 cm (1¼”) into the
sample to be tested and wait a few seconds for the
reading to stabilize.
Measurements are displayed with 0.1 mV resolution.
The “ATC” (or “MTC”) message is turned off because mV readings are not
temperature compensated.
For accurate ORP measurements, the surface of the electrode must be
clean and smooth. Pretreatment solutions are available to condition the
electrode and improve its response time (see ACCESSORIES section, page 77).
RELATIVE mV MEASUREMENTS
To enter Relative mV mode, press Rel mV function key while in mV
measurement mode. The relative mV reading will be displayed along
with the Absolute mV value and the current temperature readings.
The relative mV reading is equal to the difference between the absolute
mV input value and relative mV offset established in the relative mV
calibration.
Note: If using the pH or ISE electrode while in mV mode, the instrument
will measure the mV generated by the electrode.
ISE MEASUREMENTS
To perform ion concentration measurements, connect an ISE electrode
(and the corresponding reference if necessary) to the corresponding
BNC input and turn it ON.
Submerse the ISE electrode tip 3 cm (1¼”) into the
sample to be tested and wait for the reading to
stabilize.
The ISE reading will be displayed along with the
current temperature reading.
The ”ATC“(or “MTC”) message is turned off because ppm readings are
not temperature compensated.
In order to take accurate ISE measurements, make sure that the appropriate
ISE electrode type and ISE unit were set in SETUP menu and the
instrument was calibrated (see ISE CALIBRATION for details, page 29).
Notes: • When the reading is out of range, the display will flash the
closest full-scale value.
• The instrument will display “----” on the primary LCD if it is
not calibrated. Perform at least a single-point calibration in
order to take ISE measurements.
• Changing the selection in the SETUP menu for the ISE
electrode or the ISE parameter will require calibration.
TEMPERATURE MEASUREMENTS
pH channel
Connect the HI 7662-T temperature probe to the appropriate socket.
Immerse the temperature probe into the sample and allow the reading
on the secondary LCD to stabilize.
Note: The temperature can be displayed in Celsius degrees (ºC) or in
Fahrenheit degrees (ºF) (see SETUP for details, page 40).
EC/TDS/NaCl/Resistivity channel
Immerse the conductivity probe (which includes also the temperature
sensor) into the solution to be tested. The sleeve holes must be completely
submerged. Tap the probe repeatedly to remove any air bubbles that
may be trapped inside the sleeve.
If needed, press CHANNEL to select EC channel or/and press RANGE
repeatedly until the desired range (EC, Resistivity, TDS, Salt) is selected on
the LCD. If needed, select the “Automatic” or “No TC” compensation mode
to perform temperature measurements (see SETUP for details, page 40).
Allow for the reading to stabilize. The main LCD line displays the
measurement in the selected range, while the temperature is
displayed on the lower LCD line.
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