129 Measuring with EC Probes
22.2.6. Flow‑cell Installation
• Position and orient the probe so that it does not trap air bubbles at the sensing area.
• Do not allow deposits of sediment or other foreign material to accumulate within the sensing area.
TANK
VALVE 1
VALVE 2
FLOWFLOW
INCOMING FLOW
EXIT FLOW
3
1
2
4
5
7
6
6
FLOW CELL
1 Process controller
2 Wiring cable
3 EC probe
4 Flow‑cell adapter
5 Flow cell
6 Flow‑cell valves
7 Saddle
22.3. CONFIGURABLE MEASUREMENT PARAMETERS
Measurement Mode (Meas.Mode)
Option: EC, TDS, RES, Sal %, Sal ppt, Sal psu
TDS
A calculated value based on the conductivity of the solution (TDS = factor x EC
25
). A TDS factor is a conversion
factor used to change an EC measurement to a ppm measurement. Typical TDS factor for strong ionic solutions
is 0.50 (based upon a sodium chloride), while for weak ionic solutions is 0.70 (based upon potassium chloride).
Sal psu
The practical salinity of seawater relates the ratio of electrical conductivity of a normal seawater sample at 15
ºC and 1 atmosphere to a potassium chloride solution (KCl) with a mass of 32.4356 g/Kg water at the same
temperature and pressure. Under these conditions the ratio is equal to 1 and S=35. The practical salinity
scale may be applied to values 0 through 42.00 psu at temperatures between 0 to 35 ºC.
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