Hach-Lange POLYMETRON 83xx Basic User Manual - Manual (Page 8)

In a bypass
POLYMETRON flow chambers are designed not to retain air bubbles. To facilitate the extraction of
bubbles, use a minimum flow rate of 20L/h (ideally 60L/h).
Note: The progressive accumulation of bubbles on the surface of the probe reduces the active surface, increases
the cell constant, and leads to an abnormally low conductivity measurement.
Figure 7 Flow chamber
Note: The arrows indicate the sample flow direction.
Make sure the NPT fittings of the flow chamber (see Figure 3 on page 6 for location) are leak free by
adding waterproof material onto the male thread. The recommended waterproof material for each
flow chamber is:
Flow chamber Probe 8310/8311/8312 Probe 8315/8316/8317/8394
08313=A=0001 PTFE thread sealant tape PTFE thread sealant tape
08318=A=0001 PTFE thread sealant tape Loctite 577
08394=A=8200 PTFE thread sealant tape Loctite 577
08394=A=8150 PTFE thread sealant tape Loctite 577
Programming the transmitter
For detailed information regarding transmitter programming, please refer to the user manual
delivered with the transmitter.
Set the measurement type
Make sure that both switches on the conductivity module of the transmitter are correctly configured
on position K (to indicate a 2 electrode probe).
Set the cell constant
On the PROGRAMMING-MEASURE-PROBE menu, set the cell constant value (K) of the probe.
This value is indicated on the probe certificate and is determined with a precision of < 2% in
compliance with standards ASTM D 1125 and ISO7888.
Set the frequency
On the PROGRAMMING-MEASURE-PROBE menu, set the probe frequency in relation to the
conductivity:
K (cm -1 ) Low conductivity Average conductivity High conductivity
0.01 0.01 to 0.1 μS 0.1 μS to 20 μS 20 μS to 200 μS
0.1 0.1 to 1 μ S 1 μS to 200 μS 200μS to 2 mS
1.0 1 to 10 μ S 10 μS to 2 mS 2 to 20 mS
8 English