Hanna Instruments HI 98280 - Manual (Page 12)

12
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.
p H p H p H p H p H mV mV mV mV mV p H p H p H p H p H mV mV mV mV mV p H p H p H p H p H mV mV mV mV mV p H p H p H p H p H mV mV mV mV mV pH pH pH pH pH mV mV mV mV mV p H p H p H p H p H 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 7091.
For oxidizing pretreatment: immerse the electrode for a few minutes in HI 7092.
1.5.2 Specifications of Sensors
HI769828-0 HI769828-1 HI769828-2 HI769828-3
Description pH pH/ORP D O EC
Measure Type pH, mV (pH) pH, mV (pH), mV DO (% sat. & 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 M Ω
• 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 Rings: 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) (membrane refilling)
Dimensions 100 x 14 Ø mm 100 x 14 Ø mm 101 x 16.5 Ø mm 111 x 14 Ø mm