- Resists coating, corrosion and fouling
- Durable Noryl (plastic) construction
- Easy installation
- Low purchase cost
- Custom tee for in-line mounting
Boiler Conductivity Sensor
Stainless Steel probe
A variety of stainless steel sensors are also available for high temperature applications. Please contact us for further information.
Document |
Type |
Size |
ConductiSense
|
Brochure |
633kB |
Conductivity – Background and Measurement
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Article |
1.5mB |
CRONOS®
|
Brochure |
677kB |
®
CRIUS |
Brochure |
643kB |
CRIUS® Remote Communications
|
Brochure |
669kB |
CRONOS® and CRIUS® Control Options
|
Technical Note |
649kB |
Remote Access GPRS
|
Technical Note |
593kB |
What am I measuring when I measure the conductivity of my solution?
Conductivity is the measurement of the ionic species in a solution. It is defined as the conductance in a given volume. Conductance is the ability of the solution to conduct electric current.
How are conductivity and conductance related?
How does temperature affect conductivity readings?
Temperature has an effect on your conductivity measurement but all Pi Conductivity Sensors have a built in temperature sensor and provide automatic temperature compensation.
Can conductivity be measured in aqueous solutions only?
No, all substances possess some conductive properties. Generally organic compounds (such as benzene, alcohols, and petroleum products) have very low conductivities, while metals have very high conductivities. Measuring the conductivity of highly flammable liquids is very risky.
What is a cell constant and why are there different ones?
The cell constant, K, is equal to the area (a) normal to the current flow in centimeters squared divided by the distance in centimeters between the electrodes (d). For solutions with low conductivities the electrodes can be placed closer together or made larger so that the cell constant is less than one. This has the effect of raising the conductance so as to produce a value more easily measured by the electronics. The opposite also applies, in high conductivity solutions, the electrodes are placed farther apart or made smaller. Different cell constants are used as range multipliers. The standard K value is 1 with a K value of 0.1 being used for low conductivity water and a K value of 10 for higher conductivity water.
How are conductivity and TDS related?
How do I calibrate my meter for TDS if my dissolved solids are not the same as those in the calibration solutions sold?
Making your own standard will yield the most accurate results. This is done by making a mixture of salts in relative proportions that simulate the solution to be tested, then dissolving the mixture into distilled water. This should be done according to the following formula:1 mg salt mixture/liter of distilled water = 1 ppm TDS, or in other words, X ppm TDS = X mg of salts + one liter of distilled water.
Remember that “X mg of salts” is the number of milligrams of a mixture of salt whose proportions simulate your test solution. An appropriate value for “X” is determined by the following rule:
Choose a ppm value for a calibrated solution as close as possible to the expected ppm values of the test solutions. If the ppm content of the test solution is expected to vary a great deal, it is best to choose a ppm value for the calibrated solution in the upper 1/3 of the TDS conductivity range.
What is the difference between micromhos (µ℧/cm) and microsiemens (μS/cm)?
There is no difference. Micromhos (µ℧/cm) is more common in the U.S., while microsiemens (μS/cm) is more common in Europe.
How do I clean my electrode?
Clean electrodes with mild liquid detergent and/or dilute nitric acid (0.1 M) by dipping the sensor into solution and agitating for 2 to 3 minutes. Dilute HCl (hydrochloric acid) or H2SO4 (sulfuric acid) may also be used.
How should I store my conductivity electrode?
Rinse it in tap water when you are finished using it. You can store your electrode either wet or dry. If it is stored dry you will need to recondition the electrode before use.
How do I condition or recondition a probe?
Place the probe in a standard solution or tap water and have power running to the probe. Let the probe soak for 30 minutes to 1 hour unless otherwise specified.
What is the difference between conductivity and salinity?
The probe is the same for conductivity and salinity, but in a salinity meter a correction factor is applied to the reading. The correction factor takes the conductivity reading and converts it to ppm of a specific salt. The salt varies from manufacturer to manufacturer of standardized solutions. Some use NaCl while others use CaCO3.
Are conductivity probes interchangeable with meters?
Usually the Pi electronics can accommodate other sensors. Please contact Pi for help.
How and when do I need to calibrate the probe?
Calibrate using a standard solution in the range of the samples you are testing. Place the probe in standard solution, condition, rinse the probe in second sample of standard solution, use a third sample of standard solution to calibrate, and then adjust on the analyzer until the specified value is displayed. Recalibrate when you change ranges, or if readings seem to be incorrect.
How do I choose my range for a conductivity sensor?
The two types of conductivity sensor supplied by Pi are ‘Toroidal’ and ‘Graphite’. The ‘Toroidal’ sensor covers the higher ranges from 0 µS/cm to 2,000,000 µS/cm or more often expressed as 0 mS/cm to 2000 mS/cm.The ‘Graphite’ sensor covers the range from 0-5000 µS/cm. Within that range we use different range constants (K- factor) to make the sensor more suitable for different applications. If you are measuring in the range 0-100 µS/cm then you will need a K- factor of 0.1. If you are measuring in the range 0-1000 µS/cm then a K-factor of 1.