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MEASUREMENT
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, the last measured temperature reading, or the
last set temperature, with the MTC status.
The MTC tag and the symbol light up to indicate that the instrument is in MTC mode. Press the
/ keys to enter the desired temperature value.
Note:
When in MTC the user can press and hold the / keys, and the instrument will start
incrementing /decrementing the temperature value. The instrument keeps measuring and the
display is updated periodically.
12.2. ORP MEASUREMENT
To perform ORP measurements:
1. Connect an ORP electrode (not supplied) to the instrument and turn it ON.
2. Press
RANGE
key until mV range is displayed, if necessary.
3. Submerge the ORP electrode tip (4 cm/1½”) into the sample to be tested
and wait a few seconds for the reading to stabilize.
Measurements are displayed with 0.1 mV resolution.
Temperature compensation status 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.
12.3. RELATIVE mV MEASUREMENT
To enter Relative mV mode, press
MODE
while in mV measurement mode. The relative mV reading is
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 electrode while in mV mode, the instrument will measure the mV generated
by the pH electrode.