Do you have a retractable holder for any of your conductivity sensors?
The
SE 615 conductivity sensor will work with all M4 Knick retractable holders.
What is a cell constant?
The ratio of the distance (d) between conductivity sensor electrodes to the area (a) of the electrodes.
K = d/a
K = cell constant (cm-1)
a = effective area of the electrodes (cm2)
d = distance between the electrodes (cm)
Adjustment of the cell constant is a method for calibrating a conductivity loop to a known conductivity value.
How do you calibrate a conductivity sensor?
Conductivity sensors are calibrated using a single known value as a standard (one point calibration). An accurate process sample or known calibration standard can be used.
What is the difference between resistivity and conductivity?
Resistivity is a measure of a material's tendency to resist the flow of electrical current. Conductivity is a measure of a material's tendency to allow the flow of electrical current when a potential difference is put across it. Conductivity is the reciprocal of resistivity.
Does a conductivity measurement need to be temperature compensated?
Yes, a known temperature value is required in order to make an accurate conductivity measurement. Most conductivity sensors include temperature measurement.
Can a conductivity sensor be used for concentration measurement?
Yes, conductivity sensors can be used for measuring the concentration of many acids and bases. M4 Knick transmitters, with the exception of
MemoRail, are pre-programmed with 11 concentration curves and are able to display these values.
What is inductive (toroidal) conductivity?
Inductive conductivity is sometimes called toroidal conductivity. An inductive sensor consists of two wire-wound metal toroids encased in a corrosion-resistant plastic body. One toroid is the drive coil, the other is the receive coil. The sensor is immersed in the conductive liquid. The analyzer/transmitter applies an alternating voltage to the drive coil, which induces a voltage in the liquid surrounding the coil. The voltage causes an ionic current to flow proportional to the conductance of the liquid. The ionic current induces an electronic current in the receive coil, which the analyzer/transmitter measures. The induced current is directly proportional to the conductance of the solution.
Can we measure total dissolved solids?
Yes, but only with the
Portavo portable meters.
Can we measure salinity?
Yes, our transmitters/analyzers can be programmed to read % salinity in g/kg. Salinity is the concentration of dissolved salts in water.
What is the lowest conductivity value we can read?
The
SE 604 and
SE 605 are capable of reading conductivity values as low as 1 nS/cm.
What is our maximum temperature specification?
The
SE 600 4-electrode sensor can operate up to 410ºF.
What is our maximum pressure specification?
The
SE 600 4-electrode sensor and
SE 605 2-electrode sensor can operate up to 362 psi.
How do we handle buildup?
Inductive (toroidal) sensors are recommended for applications with high-suspended solids and the potential for buildup.
