HF scientific DRT-15CE Portable Turbidimeter - Manual (Page 15)

DRT-15CE (5/10) Page 7
1000 NTU, - Keep the outside surface of
100 NTU cuvettes clean.
& 10 NTU
- When placing any standards in the
well, always use the screw cap/
shield to cover the well in order to
keep out ambient light.
To gain access to the trimpots, remove the accessories from the foam holder.
Refer to figure 2 for trimpot identification during the next few steps.
1. Turn the DRT-15CE to the 0 - 10 Range.
2. Insert the calibration standard and index it as described in "Operation
and Description".
3. Set the Reference Adjust to the maximum "up" position.
4. Adjust R2, Ref. Offset trimpot, until the display reads 0.18 NTU.
5. Set the Reference Adjust to 0.02 NTU.
6. Insert the 10 NTU standard and index. Adjust R11 (0 - 10 NTU gain) to
obtain a reading of 10.00 NTU.
7. Rotate the range switch to the 100 NTU range. Replace the 10 NTU
standard with the 100 NTU standard and index it.
8. Adjust R12 (0 - 100 gain) to obtain a reading of 100.0 NTU.
9. Rotate the range switch to the 1000 NTU range. Replace the 100 NTU
standard with the 1000 NTU standard and index it.
10. Adjust R13 (0 - 1000 gain) to obtain a reading of 1000 NTU.
11. It is not necessary to adjust R37 (low battery indicator). This is factory
set to indicate a low battery condition when the battery voltage is below
5.6 V.
12. WARNING: R41 is factory set. Adjustment of this trimpot could cause
damage to battery and/or DRT-15CE.
This completes the calibration of the DRT-15CE.