|
A Leading South African Test and Measurement Instruments Supplier |
|
“For Good Measure”® |
|
Please contact us by phone, email or visit us at the details given above. We look forward to hearing from you. |
|
Product List |
|
T.M.I. |
|
Test and Measurement Instruments C.C. |
|
CK 1985/007464/23 |
|
“Tomorrow’s Instruments Today” — “For Good Measure” ® |
|
TMI, Established—1982 |
|
English, Afrikaans, Portuguese Speaking. Master/Visa Credit Cards |
|
PartNo: PCD-432 |
Digital TDS / Conductivity Meters |
TDS, Conductivity |
|
Part No: CD-4303 |
|
Conductivity Meter : 200uS/2mS/20mS, RS232, Data-Hold, Min/Max, Memory, ATC. Microcomputer circuit. Large LCD display. |
|
Part No: YK-2005CD |
|
Conductivity Meter : 200uS/2mS/20mS/200mS, Real Time Data Logger (16000 Point), Record-Min.Max, Data-Hold & RS232 |
|
Lutron |
|
Lutron |
|
Conductivity Meter : 2 Ranges: 2,000 uS, 20mS, External Probe. Data Hold, Records Min/Max, Auto Temp Compensation. |
|
Notes on Conductivity Meters. Conductivity meters, Total Dissolved Solids (TDS) meters and resistivity meters are analytical instruments that measure the conductivity, dissolved solids, and/or resistivity of a liquid sample. They can measure a single variable, a combination of variables, or all three variables. Often, because these variables are related, combination conductivity meters, dissolved solids meters and resistivity meters used. Conductivity, a measure of water’s ability to transmit electrical current, is a gross, indirect measurement of the concentration of ions. Consequently, conductivity can be used to estimate levels of total dissolved solids (TDS), a measurement of the dry mass of dissolved solids in water. As a rule, most of the colloidal particles are included in a TDS measurement. Resistivity, another related variable, is the reciprocal of conductivity. Specifications for conductivity meters, dissolved solids meters and resistivity meters include conductivity range, dissolved solids range, and resistivity range; conductivity accuracy, dissolved solids accuracy, and resistivity accuracy; and process media temperature. Portable, hand held, modular, lab, benchtop, field-use, and panel-mounted instruments are commonly available. These instruments have an analog meter, a digital display, or a video display such as cathode ray tube (CRT), liquid-crystal display (LCD), or flat panel display (FPD). Often, conductivity meters, dissolved meters and resistivity meters with manual controls have knobs or potentiometers. Analytical instruments with a digital front panel are programmed with a keypad. Programmable conductivity meters, dissolved solids meters and resistivity meters are also available. Conductivity meters, dissolved solids meters and resistivity meters provide electrical outputs such as analog voltages, analog currents, and analog frequencies. Devices with a switch or alarm-relay output are also available. In terms of features, some conductivity meters, dissolved solids meters and resistivity meters are battery-powered, temperature compensated, event triggered, or designed for extreme environments. Others have filters, built-in or self-calibration, or self-test capabilities. Conductivity meters, dissolved solids meters, and resistivity meters with that provide special signal processing and/or filtering are also available. Often, these analytical instruments use Butterworth or Bessel filters. Butterworth filters provide a very flat response. There is almost no attenuation in the passband, and the roll-off rate is somewhat slower than other filters. Bessel filters have a relatively flat passband and slow roll-off. |
|
Notes on TDS Total Dissolved Solids (TDS) are the total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water, expressed in units of mg per unit volume of water (mg/L), also referred to as parts per million (ppm). TDS is directly related to the purity of water and the quality of water purification systems and affects everything that consumes, lives in, or uses water, whether organic or inorganic, whether for better or for worse. Why Should You Measure the TDS Level in Your Water?Some regulations advise a maximum contamination level (MCL) of 500mg/liter (500 parts per million (ppm)) for TDS, while the World Health Organisation says 1000ppm. Numerous water supplies exceed this level. When TDS levels exceed 1000mg/L it is not considered fit for human consumption. A high level of TDS is an indicator of potential concerns, and warrants further investigation. Most often, high levels of TDS are caused by the presence of potassium, chlorides and sodium. These ions have little or no short-term effects, but toxic ions (lead arsenic, cadmium, nitrate and others) may also be dissolved in the water. Even the best water purification systems on the market require monitoring for TDS to ensure the filters and/or membranes are effectively removing unwanted particles and bacteria from your water.
|
Notes on Water HardnessDoes hard water really create problems ? Hard water can be a very costly addition to your home primarily because it leaves a residue called hard water scale on all washable surfaces. Over a period of time, hard water scale can clog your plumbing which eventually reduces water pressure. It damages water heaters, dishwashers, washing machines, coffee makers and virtually all appliances through which water passes. This scale leaves spots or streaks on dishes and glassware, and dulls the look of clothing, floors, sinks, tubs, and even hair. Corrosion often occurs because of highly acidic water that gradually eats away pipes, appliances, heaters, boilers and air-conditioning units. Water Softeners are designed to soften water so that it washes brighter, rinses cleaner and feels much better. High TDS indicates Hard water, which causes scale buildup in pipes and valves, inhibiting performance. Since TDS is related to water hardness, using a TDS meter can be your first step in determining the degree of hardness of the water. Generally speaking, the higher the level of TDS (ppm), the higher the degree of hardness. Water hardness is typically reported in parts per million (ppm).
|
Where Do Dissolved Solids Come From?Some dissolved solids come from organic sources such as leaves, silt, plankton, and industrial waste and sewage. Other sources come from runoff from urban areas, fertilizers and pesticides used on lawns and farms.
Dissolved solids also come from inorganic materials such as rocks and air that may contain calcium bicarbonate, nitrogen, iron phosphorous, sulfur, and other minerals. Many of these materials form salts, which are compounds that contain both a metal and a nonmetal.
Salts usually dissolve in water forming ions. Ions are particles that have a positive or negative charge. Water may also pick up metals such as lead or copper as they travel through pipes used to distribute water to consumers.
The efficacy of water purifications systems in removing total dissolved solids will be reduced over time, so it is highly recommended to monitor the quality of a filter or membrane and replace them when required. |
|
Some Sources: tdsmeter.com, globalsource.com |
|
Notes on Health and Water. Why is pure water healthier to drink? We are all affected by toxic minerals and chemicals found in the air and in our food on a daily basis. Water is the only way the body has to flush out these toxins. The purer the water is to start with, the higher its capacity to collect and cleanse these compounds from the body. Why is it very important for children to consume pure water? A child’s immune system and detoxification system are still developing throughout early childhood and teen years. Exposure to even very low levels of toxic chemicals or lead in drinking water at a young age can lead to increased risks of degenerative diseases and learning disorders in later years. Since many of the crucial defense systems that help protect adults from disease and environmental pollutants are not fully developed in children, they are much more sensitive to contaminants. A child consumes 3 times as much water per pound of body weight than an adult does, so they get a much bigger dose of the contaminants in our water. Their developing bodies are simply much more sensitive. Currently, the health standards that determine how much and what levels of contaminants we are permitted to consume in our drinking water are all based on the potential effects on adults. Don’t you need the minerals in your drinking water? Inorganic Minerals It’s believed that mineral waters help furnish elements for body metabolism. However, there is scientific proof to suggest that most of these minerals are in an inorganic (dead) form. They cannot be used in the physiological process of building the human cell, even though in circulation. With this in mind, we can see that mineral water may give "dead" or "inorganic" minerals to the body which cannot be properly assimilated. These inorganic minerals may interfere with the delicate and complex biology of the body. The body's need for minerals is largely met through foods, NOT DRINKING WATER." -The American Medical Journal Fact: The organic minerals in tap water represent only 1% of the total mineral content of the water. One glass of orange juice contains more beneficial minerals than 100 lts of untreated tap water. Organic, or Bioavailable Minerals Only after they have passed through the roots of plants do these inorganic minerals become organic, through photosynthesis, and capable of being assimilated into our tissues as ORGANIC Minerals. Pure water removes the inorganic mineral deposits in your body. Organic minerals are fully absorbed and remain in your tissues. According to many nutritionists, minerals are much easier to assimilate when they come from foods. Copyright © 2009—2023 Test and Measurement Instruments C.C. | All rights reserved TDS, Conductivity Meters |
|
Part No: CD-4307SD |
|
Conductivity Meter , TDS, SALT Data Logger: 200µS/200mS, SD Memory Card Logger. Temperature Compensation, LCD display for Low Power Consumption. |
|
Lutron |
|
Part No: CD-4301 |
|
Conductivity Meter : 2mS/20/200mS, Portable, Easy Operation. Temperature Compensation, Data Hold, LCD display for Low Power Consumption. |
|
Lutron |
|
Part No: CD-14 |
|
Calibration Solution. 1.413mS Standard Solution for the following Models: CD-4301,CD-4302/03/06, YK-22CT/43CD/2004CD/2005CD. |
|
Lutron |
|
Accessories |
|
Part No: YK-2001PH |
|
pH Meter : Intelligent pH Meter/mV, 0.00to 14.00 pH, +/-19999mV, C/F, Record-Min/Max, Memory, Data Hold Conductivity and TDS, as well as Dissolved Oxygen. |
|
Lutron |
|
Part No: YK-200PCD |
|
Conductivity Probe for YK2001PH, 2/20 ms 2 Ranges, 0 to 60 deg C, C/F, ATC (Automatic Temperature Compensation) |
|
Part No: YK-200PCT |
|
Conductivity / TDS Probe for YK2001PH, 2/20 ms 2 Ranges, Total Dissolved Solids,132 to 20000PPM |
|
Lutron |
|
Lutron |
|
Part No: YK-200PDO |
|
Dissolved Oxygen Probe for YK2001PH, 0 to 20 m/L Diaphragms and Electrolyte included. |
|
Lutron |
|
Part No: PE-03 |
|
pH electrode. 0 to 13 pH General Purpose pH Electrode, Epoxy body, 12.3mm dia. X 160mm. |
|
Lutron |
|
Part No: PE-01 |
|
pH electrode. 0 to 14 pH Professional High Quality pH Electrode, Epoxy body, 9.5mm dia. X 130mm. |
|
Lutron |
|
Part No: PE-06HD |
|
Spear tip pH electrode. 1 to 13 pH (Typical 0—14 pH) General purpose electrode, ideal for piercing into meat, sausage, cheese. Durable glass in rugged epoxy body. |
|
Lutron |
|
Part No: ORP-14 |
|
ORP Electrode, with BNC Connector& 3 Meter Cable, 12,5 mm X 150mm, (High Accuracy) For use with ORP203, PH206, PH207,PH208, YK2001PH,YK2005WA |
|
Lutron |
|
Conductivity Meter : 2 Ranges: 2,000 uS, 20mS, Built-in Probe. Data Hold, Records Min/Max, Auto Temp Compensation. |
|
Lutron |
|
T + M ® |
|
Excess Stock to be cleared while stocks last. > Click for More... |
|
Part No: PCD-431 |
|
Notes on EC or Electrical Conductivity The EC (measured in mS/m) of water indicates whether the water is fresh or saline. Electrical Conductivity indicates where the water originates from, so if water travelled over granite, it has an EC of around 5 mS/m. Water that travelled over sedimentary rocks usually has a much higher EC, ranging from 30 to 170 mS/m. Aesthetic problems of water with an EC as high as 150 mS/m, are that it tastes salty and water with an EC higher than 300 mS/m, fail to quench your thirst. The water pH can be increased with the addition of alkaline reagents, such as lime, sodium hydroxide or sodium carbonate. The water pH can be decreased with the addition of acidic reagents, such as sulphuric or hydrochloric acid or it can be done by the addition of carbon dioxide, which forms carbonic acid when it reacts with water. Chemical adjustment of water pH, will increase the salinity of the water, thus care should be taken not to overdose the water with chemicals. This needs to be monitored very carefully.
|
|
R 800.00 Excl VAT |
TDS Meters can be used in all Water Purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver. |
|
Part No: TM-TDS3 |
|
TDS Meter, for Total Dissolved Solids. With Carrying Case. Reads Temperature. Pocket size. Meter. Measures 0– 9990 ppm. 1000 Hrs Battery life. |
|
TDS Meter, Total Dissolved Solids with built-in Thermometer. Smallest Meter on Market. Measures 0– 9990 ppm. Resolution - 1ppm. 1000 Hrs Battery Life. |
|
Part No: YK-22CTA |
|
Combo Conductivity, Salt , Temp & TDS (Total Dissolved Solids) 200µS/20mS (4 ranges), 200/200,000PPM (4 ranges) Datahold, Min/Max, RS232 output. |
|
Lutron |
|
Lutron |
|
T + M® |
|
Part No: TM-TDS4 |
|
T + M® |
|
Part No:WA-2017SD |
|
pH Multifunction Meter with ORP, Dissolved Oxygen, Conductivity, TDS and Salt Meter. Only one probe included: CD/ TDS/ Salt, Others probes are Optional. |
|
Lutron |
|
Test our Service and Measure with our Instruments. |
|
Part No: CD-4317SD |
|
Conductivity Meter. Real Time Data Logger. TDS and Salt Measurement. Pt Glass Electrode. 200uS/ 2 mS / 20mS / 200mS. Salt 0% - 1% (weight).RS232, USB out. |
|
Lutron |
|
Brand Names |
|
All brands, trade names, trade marks, and logos are the property of their respective owners. |
|
Ph: +27 (011) 683 4365 / 6 E-mail: sales@instrumentsgroup.co.za
Physical Address: 3 Angelica Ave, Glenvista, Johannesburg, 2091 SOUTH AFRICA
Postal Address: As Above. |
|
Part No: CD-4319SD |
|
Water Hardness / Pure Water Meter / Conductivity, TDS, Hardness, Resistivity, Temp, Salt. SD Card Real Time Data Logger . Salt Probe. C/W Hard Case. |
|
Lutron |
|
This Month’s Special |
|
Click Ex-Series for Spec. Also: Thermal Imagers |
|
Part No: WAC-2019SD |
|
pH / ORP, DO, CD, TDS, Salt Meter, SD Card Real Time Datalogger Professional All in One: Records to Excel. No software needed. Needs Some Optional Electrodes. |
|
Lutron |
