Hanna-instruments HI 93703 User Manual download pdf (Page 6)

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LOG LOBAT

TIME

DATE

LOGGING

MICROPROCESSOR

TURBIDITYMETER

LOGGING

MICROPROCESSOR

TURBIDITY

METER

HI 93703-11

VIEWVIEW

STOSTO

CLRCLR

GLPGLP

CALCAL

DATEDATE

READREAD

ALTALT

OFF

ON

%

188

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FUNCTIONAL DESCRIPTION

1) Measurement cell

2) LCD (Liquid Crystal Display)

3) ON/OFF/CLR key, to turn the meter ON

and OFF, and to clear log memory

4) GLP/CAL key, to display last calibration

date & time, and to enter calibration mode

5) STO/VIEW key, to store sample after read-

ing, and to view log memory

6) READ/DATE key, to perform measure-

ments, and to display (toggle) current

date/time

7) ALT key, to activate the second functions

(second function keys in orange)

8) RS232 connector (5 pin)

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* 1 FTU = 1 NTU

STANDARD SUSPENSION

Presently, there are only two recognized pri-

mary standards: AMCO-AEPA-1 and formazine.

Hanna supplies HI 93703-11 with the AMCO-

AEPA-1 which has a much longer shelf life at all

concentrations (approx. six months, if free from

contamination). In addition, no special handling

or disposal is required and a much higher

stability of suspended particles has been ob-

served.

On the other hand, formazine is a toxic sub-

stance, generated by a known carcinogen, with

poor stability (particles flocculate and settle

quickly). Lower concentrations change value

within a few days or hours after dilution.

The consistency of HI 93703-11 readings by

using both standards has been separately es-

tablished by Advanced Polymer Systems and

Hanna Instruments.

Additional documentation about the formazine

standard and more complex calibration proce-

dures is available upon request.

• All glassware that comes into contact with

standards should be maintained clean. Wash

with the HI93703-50 cleaning solution and

rinse with HI 93703-0 or turbidity free water.

• Rinse the vial twice with 5 ml of the liquid to

be tested. This removes the effect of any

previous liquid and any dust or foreign ob-

jects that may be present inside. Gently pour

the liquid down the side of the vial to reduce

air bubbles (no mixing is required when HI

93703-0 and HI 93703-10 AMCO-AEPA-1

standards are used).

• Before inserting the vial into the instrument,

wipe it with HI93703-70 or a soft, lint-free

tissue. Handle vials so that no fingerprints

can get on the areas where light passes

(approx. bottom 2 cm/1").

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