Hanna-instruments HI 9828 Bedienungsanleitung PDF herunterladen (Seite 11)

Since the Pt/PtO system depends on the pH, the pretreatment of the electrode

may be determined by the pH and the redox potential values of the solution to be

measured.

As a general rule, if the ORP (mV) reading corresponding to the solution pH

value is higher than the values in the table below, an oxidizing pretreatment is

necessary; otherwise perform a reducing pretreatment.

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pHpH

mVmV

pH pH

mV mV

pHpH

mVmV

0 990 1 920 2 860 3 800 4 740 5 680

6 640 7 580 8 520 9 460 10 400 11 340

12 280 13 220 14 160

For reducing pretreatment: immerse the electrode for a few minutes in HI 7091L.

For oxidizing pretreatment: immerse the electrode for a few minutes in HI 7092L.

1.5.2 Specifications of sensors

HI769828-0 HI769828-1 HI769828-2 HI769828-3

Sensor Type pH pH/ORP DO EC

Measure Type pH; mV (pH) pH; mV (pH); mV DO% sat; DO conc. EC; TDS;

resistivity; salinity

Measure Range 0.00 to 14.00 0.00 to 14.00 0.0 to 500.0 % 0.000-200.000 mS/cm

±600.0 mV (pH) ±600.0 mV (pH) 0.00 to 50.00 mg/L 0-400000 mg/L

±2000.0 mV 0 to 1.0000 MΩ/cm

0.00 to 70.00 PSU

Color Code Red Red White Blue

Materials Tip: glass (pH) Tip: glass (pH); Pt (ORP) Cat/An: Ag/Zn Stainless steel

Junction: cloth Junction: cloth Membrane: PTFE AISI 316

Body: PEI Body: PEI Body: PVC Body: PVC

Electrolyte: gel Electrolyte: gel

Reference: double Reference: double

Maintenance HI 70300 HI 70300 HI 7042S -

Solution (storage) (storage) (refilling)

Dimensions 100 x 14 Ø mm 100 x 14 Ø mm 101 x 16.5 Ø mm 111 x 14 Ø mm

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 59 60

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Hanna-instruments HI 9828 Bedienungsanleitung Seite 11