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Page 14
5.2 Calibration Procedure
1. Plug the Turbidity sensor into the
Turbidity
socket.
2. Switch the meter on.
3. Rinse the Turbidity sensor in distilled water and blot dry.
Zero Calibration
4. Place the Turbidity sensor into a sample of fresh Distilled water (NOT
the rinse water used in step 3). If possible, the vessel should have
black or dark floor and walls to avoid reflection affecting the reading.
Ensure that there is a minimum of 30mm clearance to the floor and
walls of the vessel, as per the following diagram…
Take care to ensure that there are no bubbles trapped on the
underside of the sensor. Bubbles can interfere with Turbidity
measurements. Gently stir the sample or the sensor to dislodge any
bubbles.
5. Select Calibration (
→
→
→
→
F1:Cal.
). The following screen will be
displayed…
0*1NTU 25.0
°°°°
c
F1:Cal at Zero
6. When the reading has stabilised at or near zero, press
to calibrate.
Note that a “
∗
∗
∗
∗
“ will not be removed until a full two point calibration
has been performed.
Continued over the page…