Conductivity Meter - Senze-Instruments

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Process & Quality Control

Conductivity Meter

Laboratory Product > Water Quality
HI8733   Multi-range EC Meter

Portable Multi-range EC Meter - HI8733
The HI8733 is a durable, portable EC meter designed for use in areas of production, quality control and is suitable for use in a variety of applications.
It is supplied with a four-ring conductivity probe to allow for four ranges of measurement.
The four ring technology also eliminates the polarization effect that is common with standard two pole versions.
This offers four measurement ranges from 0.0 µS/cm to 199.9 mS/cm with a ±1% FS accuracy.
The HI76302W four-ring conductivity probe  allows for a wide range of measurements with a single sensor.
The probe also features a built-in temperature sensor to allow for Automatic Temperature Compensation from 0 to 50°Cand an adjustable β from 0 to 2.5%/°C.

Conductivity readings are adjusted with Automatic Temperature Compensation (ATC), assuring users of consistent and accurate measurements.
•Four-ring probe
•Four measuring modes
•Automatic Temperature Compensation

 


HI2003-02  edge®
Dedicated Conductivity/TDS/Salinity Meter

edge®’s groundbreaking design is the culmination of Hanna’s vision, design capabilities, integrated production and world-class R&D. edge® is a single meter that can measure Conductivity, TDS and Salinity and is incredibly easy to use.

  • edge® EC/TDS/Salinity utilizes four ring conductivity probe technology that allows the user to measure samples from very low conductivity to very high conductivity.
  • edge® features a capacitive touch keypad that gives a distinctive, modern look. The keypad is sensitive enough to be used with laboratory gloves and has a fast response.
  • edge® features a 5.5” LCD display that you can clearly view from over 5 meters away. The large display and it’s wide 150° viewing angle provide one of the easiest to read LCD’s in the industry.

EC Specifications

EC Range :  0.00 to 29.99 μS/cm,
                  30.0 to 299.9 μS/cm,
                  300 to 2999 μS/cm,
                  3.00 to 29.99 mS/cm,
                  30.0 to 200.0 mS/cm, up to 500.0 mS/cm (absolute EC)**
EC Resolution :  0.01 μS/cm,
                        0.1 μS/cm,
                        1 μS/cm,
                        0.01 mS/cm,
                        0.1 mS/cm
EC Accuracy (@25ºC) :  ±1% of reading (±0.05 μS/cm or 1 digit,
                                   whichever is greater)
EC Calibration : 1 point offset calibration (0.00 μS/cm in air),
                       1 point slope calibration in EC standard 84 μS/cm, 1413 μS/cm,
                       5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm and 111.8 mS/cm

** with temperature compensation function disabled

edge® Conductivity/TDS/Salinity is packed with many cutting-edge features to ensure accuracy and usability.
Digital EC Electrode

edge® EC electrode is highly advanced, featuring a built-in microchip that stores calibration information that is automatically retrieved by edge® once the electrode is plugged in.
Information stored in the electrode includes model number, serial number and calibration information including the standards used and the date and time the last calibration was performed

Four Ring Probe

The edge® EC/TDS/Salinity meter is supplied with the HI763100 four ring platinum conductivity probe that has a built-in temperature sensor for automatic temperature compensated measurements.
The four ring technology allows for a wide range of measurement with a single probe as compared to amperometric two pole probes that have a limited range and can suffer from polarization effects.
The HI763100 probe has a glass and PVDF body with a PEI (polyetherimide) sleeve. Both materials have excellent resistance against many aggressive chemicals.

3.5 mm Probe Input

Plugging an electrode in has never been simpler; no alignments, no broken pins, just connect the 3.5 mm plug and get started.

Wall Mount

Using the wall mount cradle (included), edge can be placed on a wall, leaving zero footprint on the benchtop space. The cradle has a built in connector to power edge and charge its batteries. edge's zero footprint design saves you valuable benchtop space.

Cradle and Electrode Holder

edge® is equipped with a benchtop cradle featuring an adjustable swivel electrode holder to charge and hold the meter securely in place at the optimum viewing angle.

Two USB Ports

edge® includes one standard USB for exporting data with a flash drive and a second micro-USB port for you to connect to a computer for file export and for charging your edge when the cradle is not available.

Data Logging

edge® allows you to store up to 1000 log records of data. Data sets include readings, GLP data, date and time.

Two Operating Modes

edge® offers both Basic and Standard Modes.
In Basic Mode, the edge as an EC meter reduces features to simplify operation. In Basic Mode, the meter will only allow for automatic temperature compensation, auto ranging of readings, and automatic cell factor correction while calibrating. The temperature correction coefficient is fixed to 1.9% / °C and interval logging is not available.
In Standard Mode, the user has options to change these settings.

What is EC?

Electrical Conductivity (EC) is defined by the ability of a solution to conduct an electrical current.

What is TDS?

Total Dissolved Solids (TDS) is defined as the amount of solids dissolved in a solution.

What is their relationship?

The relationship between the amounts of solids such as salts found in fertilizers is directly proportional to their conductivity, therefore, the higher the amount of solids the greater the conductivity. This is because when fertilizers are dissolved into water they become "ions", which means that they become positively or negatively charged and can therefore conduct a current.

How does an EC/TDS meter work?

Two electrodes with an applied AC voltage are placed in the solution. This creates a current dependent upon the conductive nature of the solution. The meter reads this current and displays in either conductivity (EC) or ppm (TDS).

Conversion Factors
TDS meters read the conductivity; the meter automatically converts this value to TDS which is typically displayed in ppm.  

Temperature Compensation
Temperature affects the activity of the ions in solution but does not affect the concentration, therefore meters with temperature compensation correct for this condition.

How is TDS measured?
By means of a conductivity meter. The conductivity is measured and the TDS is calculated by a fixed mathematical formula in the meter.

What is the difference between microSiemens (µS) and milliSiemens (mS)?
Both are units of conductivity. 1000 microSiemens (µS) = 1 milliSiemen (mS).
How do I convert between milliSiemens (mS) and ppm?
Convert to microSiemens by multiplying by 1000. Then multiply by 0.7: ex. Your reading is 2.14 milliSiemens (x 1000 = 2140 microSiemens). 2140 x 0.7 = 1498 ppm. Or simply multiply by 700. (2.14 x 700 = 1498)

What if I want to switch to EC measurements?
If you do not have a meter which reads both in EC and TDS you may prepare your fertilizer solution according too the directions given and take the EC reading. This will be your value. Or, consult with the manufacturer of your fertilizer for the correct EC readings for that particular fertilizer.

What is the relation between electrical conductivity (EC) & dissolved solids (TDS)?
Though there is a close relationship between TDS and Electrical Conductivity, they are not the same thing.
Total Dissolved Solids (TDS) and Electrical Conductivity (EC) are two separate parameters.
TDS is the combined total of solids dissolved in water. EC is the ability of something to conduct electricity (in this case, water's ability to conduct electricity).
The only true method of measuring TDS is to weigh residue found in water after the water has evaporated.
You know those spots you see on a glass after you wash it and let it air dry? That's TDS!
That residue has mass, and it's possible to weigh it, but if you're not in a lab, it can be tricky thing to do.
Therefore, we can estimate TDS levels based on the conductivity of the water since the hydrogen and oxygen molecules of the H2O carry almost no electrical charge.
The EC of most other metals, minerals and salts will carry a charge. A A TDS meter measures that EC level and then converts it to a TDS measurement.
Since different metals, minerals and salts will be more or less conductive than others, there are different conversion factors that can be used.

ppm (parts per million) is the most commonly used scale to measure TDS (Total Dissolved Solids)

µS (micro-Siemens) is the most commonly used scale to measure EC (Electrical Conductivity).  

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