Hach-Lange POLYMETRON 8350_8351 User Manual - Manual (Page 6)

2/6
1 SPECIFICATIONS
The 8350 pH and 8351 redox probes are dedicated for process measurements (fouling) and are
protected against mechanical shochs.
All these pH probes incorporate process-contact temperature sensors and impedance control.
8350.4 8350.5 8351
Glass
Junction
Tube of Pt 100
Platinum ring
PTFE Junction
Stainless steel
tube of Pt 100 Glass (flat)
PTFE Junction
Platinum ring
NOTE: A special model, the 8350.3, is compatible with all the current, standard accessories and
is designed for use in contact with hydrofluoric acid.
8350.4 8350.5 8351
Application: Measuring pH at
high temperatures Measuring pH in a
fouling environment Measuring redox
Junction type Flat, PTFE Flat, PTFE Flat, PTFE
Body material PPS CPVC PPS
Measurement range 0…14 pH 0…12 pH ± 1500 mV
Maximum temperature (°C) 110 80 110
Maximum pressure 10 bar 10 bar 10 bar
Drift (/ week) < 3 mV < 3 mV < 3 mV
Offset @ pH7 ± 20 mV ± 20 mV -
Slope 56…61 mV / pH 56…61 mV / pH -
Reference impedance @ 25 °C < 50 kohm < 50 kohm < 50 kohm
Glass impedance @ 25 °C 150 … 500 Mohm 50…250 Mohm Platinum