Hf-scientific DRT-100B Research Turbidimeters Uživatelský manuál stáhnout pdf (Strana 13)

Page!5DRT-100B!!(5/00)

(B) STANDARDIZATION (cont’d)

The instrument is now referenced to the factory calibration and unknown samples may be read directly in NTU.

For best accuracy, the instrument should be standardized on a scheduled basis. The need to actually adjust

standardization will vary depending upon the operational environment.

(C)

SAMPLE MEASUREMENT

1. Place the sample in the Optical Well.

2. Set the Range Switch located on the front panel to an appropriate range.

3. Read the value on the digital display.

For accurate measurements in the low range rotate “grab samples” cuvettes in the well to obtain the minimum

reading. Mark the cuvette and the instrument so that orientation of the cuvette will be identical each time it is

placed in the instrument. Always use the cuvette cap when measuring a grab sample.

NOTE:

1. Settling particles or air in the sample may cause the digital reading to change rapidly. Readings should

be taken without delay before turbid particles settle.

2. Cuvettes must be clean and free of smudges or scratches. Cleaning is accomplished by washing in a

detergent solution then rinsing thoroughly 8 to 10 rinses in clean, preferably distilled, water to remove

all streaks.

Scratched cuvettes should be replaced.

Reusable cuvettes, (pkg. of 10 each - catalog number 50052, pkg of 3 - catalog number 50051) should

be stored in a clean, dust free environment.

IV. CALIBRATION PROCEDURES

(A) SECONDARY STANDARD SET (optional) Catalog No. 19887

HF Secondary Standards are recommended and certified by HF scientific. They are traceable to

freshly prepared formazin primary standards. These standards are very easy to use off the shelf anytime

without preperation making them an ideal turbidity standard. A Certified of Traceability is available on

request to HF scientific Customer Service Depatartment. HF Secondary Standards may be used for calibra-

tion of all HF turbidimeters. Order from HF scientific, inc.

NOTE:NOTE:

NOTE:

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iods.

Do not shake standards.Do not shake standards.

Do not shake standards.

Specific instructions for the usage of the certified Secondary Standard are included with the kit.

Each Secondary Standard Kit contains:

-- Instructions

-- 0.02 Reference Standard

-- Certified Secondary Standard 8.00 and 800 NTU are contained in preselected cuvettes with

light sheild caps.

-- A sturdy storage case.

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