Hach-Lange POLYMETRON 8398 - Manual (Page 9)

Inductive Probe 8398
6
3. TECHNICAL
SPECIFICATIONS
3.1 Specifications
Measurement range 0 to 2000 mS/cm
Precision r 2 % of the displayed value or r 0.004 mS/cm
Conductivity response < 1 s
Temperature response T 50 % = 20 s
T 90 % = 2 mn
Cell constant K = 2.35 cm
-1
Roughness Ra < 0.5 μm (roughness certificate on request,
Ref.: 08398=T=1111)
Chemical resistance Our mono-block probe is made from PEEC
(poly ether ether Ketone), whose chemical
resistance is summarised in the table §9.
WARNING: PEEC is not resistant to high
concentrations of oxidative acids (nitric and
sulphuric acid > 70 %, etc.) In the case of
probe 8398.5, one must consider the other
materials in contact with the process (EPDM or
VITON gaskets, PP or 316
stainless steel
extension, etc.).
Mechanical resistance PEEC possesses a flexion temperature
(pressure: 18 bars) of approximately 300 °C.
In the case of probe 8398.5, take account of
extensions, if any.
Heat resistance PEEC is a polymer that is particularly well-
suited to sterilisation, it can therefore withstand
temperatures of 140 °C.