Suitable for waste water, potable water monitoring, mixed liquor suspended solids monitoring, return activated sludge, centrate monitoring, filtrate monitoring, sludge, and many more applications where a traditional turbidimeter or suspended solids analyser would be used. The suspended solids sensor can be fitted with an auto-cleaning function that blasts either water or air across the optical windows keeping them clean.
With the SoliSense® range of Suspended Solids monitors you get a world class sensor (patented).
Suspended solids are particles suspended in water. They occur naturally and can be seen for example in rivers after a rainfall event when the river appears ‘muddy’.
Water and waste water treatment is largely about removing particles and organics, and then disinfecting water. Being able to measure suspended solids or turbidity can help in determining the best treatment, for example by measuring the suspended solids in the raw water coming in to a plant. Typically, suspended solids in waste water treatment has specific names such as MLSS (Mixed Liquor Suspended Solids) or RAS (Return Activated Sludge) etc. Measuring the suspended solids using an online suspended solids monitor around a waste water treatment plant can provide vital information on the efficiency and efficacy of the treatment process.
Typically, suspended solids are measured in mass per volume units such as mg/l or mgl-1. Sometimes when the solids are quite high they will be measured in g/l or %.
Suspended solids is a ‘unit per volume measurement’ e.g. 1 mg of suspended solids in 1 litre of water. Turbidity is a measurement of ‘cloudiness’. Although each suspended material will have a different relationship (which will change over the range) a useful ‘rule of thumb’ is that 1 mg/L = 2 NTU although this can range from 1 mg/L = 0.5 NTU to 1 mg/L = 2 NTU.
Each SoliSense® has temperature compensation built in so the effect of temperature on the online total suspended solids meter measurement is negligible. It should be noted though that the SoliSense® is a large mass that can take time to reach thermal equilibrium so any process where the temperature is changing rapidly >2°C per 10 min could see some temperature effect on the reading.
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Whatever the process being monitored is, there is often something in the sample water capable of fouling a sensor, and therefore causing erroneous results. The obvious solution to this problem is to clean the sensor, but how regular should inspection and cleaning programs be for each piece of instrumentation? Too regular and the inspection and cleaning regime is time consuming and unnecessarily costly. Not often enough and the instrumentation will give false results and probably fail prematurely.
Pi’s Autoclean and Autoflush systems can give trouble free and fouling free functioning of sensors for weeks, if not months, at a time.
If using air to clean a DO sensor the system can also automatically verify that the sensor is still responding correctly, removing any need to remove the sensor from the sample for months at a time.
| Document | Type | Size |
|---|---|---|
| SoliSense® | Brochure | 650kB |
| Measurement of Suspended Solids | Technical Note | 742kB |
| SoliSense® Mounting Options | Technical Note | 686kB |
| Probe Fouling | Technical Note | 459kB |
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A multi-parameter analyser from Pi attracted many customers to Beijing Anyuan’s exhibition space at the China Water Supply Conference 2021 and Pi’s representative based in China, Chen Jiang, was there
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In February 2019, Pi welcomed Craig Bradshaw from AllPronix for a week of advanced product training at the head office in Burnley, UK. Craig is the product specialist for Pi
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