Hf-scientific DRT-15CE Portable Turbidimeter Manuale Utente Scaricare il pdf (Pagina 14)

DRT-15CE (5/10) Page 6

Each kit contains:

-- Instruction manual

-- 1 liter of 4000 NTU Stock Suspension

-- 1 Gallon (3.79 liters) turbidity-free water

-- 4 Sample cuvettes (28 mm)

-- 4 Light Shield Caps

-- Graduated Pipettes 1 ea. in 1 ml, 10 ml, & 25 ml

-- 1 Calibration Standard

The following table gives the recommended dilutions of the stock suspension.

Be sure to adequately mix the stock suspension prior to removing a portion

for dilution.

PROCEDURE

NTU Value Pipette Amount Base

Formazin

Volumetric

Flask

10.0 NTU 10.0ml 2.5ml of 4000 NTU 1000ml

100.0 NTU 10.0ml 5.0ml of 4000 NTU 200ml

1000.0 NTU 25.0ml 25.0ml of 4000 NTU 100ml

NOTE:  Whenthepreparedsamplesstarttoocculate,theyare

unreliable and fresh ones must be made. This will occur

more rapidly for the lower value diluted suspen sions.

Prepare 40 NTU and lower standards daily.

7.2 ELECTRONIC CALIBRATION USING FACTORY

CERTIFIED PROCAL STANDARDS (CAT. NO. 39071)

The DRT Turbidimeters have been carefully calibrated at the factory.

However, should the Electronic P.C. Board, the Photo Detec tors, or the Light

Source be replaced recalibration may be easily accomplished at your facility.

To carry out a complete calibration the following ProCal Standard values are

required:

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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Hf-scientific DRT-15CE Portable Turbidimeter Manuale Utente Pagina 14