Hanna Instruments HI 9828 - Manual (Page 11)

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.
pH pH pH pH pH mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV
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