Calibration In Water Saturated Air - Hach sension6 Instruction Manual

SECTION 3,
continued

3.3.4 Calibration in Water Saturated Air

Note: Avoid completely
filling the lower chamber
with water.
9. When the meter cannot complete the zeroing procedure it will
begin to beep and show the faulty probe icon. If the meter
does not complete the zeroing procedure and exit to the
reading mode, add additional sodium sulfite and cobalt
standard solution to the stirring water. Otherwise, press the
key to back up one display screen at a time and leave the
EXIT
calibration routine without completing the zeroing procedure.
1. Secure the probe cable to the calibration and storage chamber
by wrapping cable through the bottom of the chamber lid
before filling with water.
2. Prepare the calibration and storage chamber by holding it
under water and squeezing it a couple of times to pull a small
amount of water into the lower chamber through the inlet.
Alternately, open the bottom of the chamber and insert a
water-soaked sponge.
3. Insert the DO probe into the calibration and storage chamber.
The tip of the probe must not be flooded with water or be
holding a drop of water on the membrane.
4. Allow at least ten minutes for the atmosphere in the chamber
to reach a steady state.
Note: Squeezing the lower chamber a couple of times to force water
saturated air into the probe chamber will speed up stabilization.
Note: Keep the DO probe at a uniform temperature. When holding the
probe, do not touch the metallic button on the side of the probe. The
button is a thermistor that senses temperature. An inaccurate
calibration will result if the temperature of the thermistor is different
from the probe membrane.
5. Press the key located in the lower left corner of
CAL
the keypad.
6. The main display will show the current value for the
barometric pressure. If the meter has been moved to a
different elevation or if the barometric pressure has changed,
enter the new value.
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