Nova-Tech DO 700 - Manual (Page 12)

The DO 700 will accept one calibration point in concentration mode.
The minimum value is 2 mg/L (ppm), and the calibration window is +/-
40% of the factory default value.
Temperature and % saturation calibration should take place before
attempting to perform mg/L (ppm) concentration calibration.
Calibration of the concentration mode will only replace the previous
concentration calibration and does not affect the % saturation
calibration.
To offset your % saturation reading to match another instrument, see
Section 5.8 – Offset Adjustment .
Perform daily calibration for best results. New calibration values will
automatically override the existing data. To completely recalibrate the
meter and when installing a replacement electrode, it is best to clear all
calibration data. See
Section 5.10 – Reset .
4.1 Temperature Calibration
For best DO accuracy, ensure that the temperature is accurate. The
thermistor sensor used for automatic temperature compensation and
measurement is accurate and stable, so frequent calibration isn’t
required. Temperature calibration is recommended upon probe
replacement, whenever the temperature reading is suspect, or if
matching against a certified thermometer is desired.
The DO 700 will default to 25 ºC / 77 ºF when the ATC plug is not
connected.
1) Place the probe into a solution with a known accurate temperature
such as a constant temperature bath.
2) Press followed by . The primary display shows the
measured temperature while the secondary display shows the
factory default temperature.
4) Adjust the temperature using or . Press to accept or
to cancel. The meter allows an adjustable maximum value of ±
5
º
C (or ± 9
º
F) from the factory default temperature.
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