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pH measurement is usually done with the use of a combination electrode. The combination electrode is an electrode system formed by a glass sensing half-cell and an internal reference half-cell. As the reference junction acts as the medium of conductor between the reference electrolyte and the sample to be measured, it must allow free movement of electrons through the junction and into the sample.
A potential develops on the membrane surface when a pH electrode comes into contact with a sample and its value varies with the pH of the sample. This variation in potential is measured in mV by a meter and is converted to direct pH values.
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Stable reference systems are the heart of reliably functioning, long-lasting electrodes. In pH measurement up till now, the user was not spared the need for frequent calibration. The reason for this lies in shifting reference potentials due to chloride loss in the reference electrolyte. However, contaminated and partially clogged diaphragms also contribute considerably to changing properties in pH electrodes, which can only be resolved with a fresh calibration. For pH measurements where a very high degree of accuracy is required, it should therefore be sufficient if the pH sensor is calibrated just before measuring. But in industrial applications - especially in the case of online pH measurement - this is possible only with a great deal of effort, if at all. What is even worse: even if a calibration with certified pH buffers is correctly carried out, the very next measurement will not necessarily be accurate! Depending on the age of the electrode or, more precisely, the state of the diaphragm and the chloride content in the reference electrolyte, different diffusion potentials may occur in buffers and measurement medium. Technically speaking, it is impossible to eliminate this source of error entirely, but with pHeasy technology it is possible to detect it online!
Hamilton, with its pH glasses and the ingenious inner buffer, has built true long term stability into pHeasy electrodes.
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pH sensor
- Low alcaline error
- Higher life expectancy, given that refillable
- Blocking resitant
description
The Kuntze AH-300-K-2-1 is a combination electrode with ceramic junction for pH measurement. The sensor is liquid filled, thus blocking resistant and particulary suitable for lightly polluted media.
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pH Sensor
The Pico pH sensor is a robust epoxy bodied pH electrode ideal for educational use. The pH sensor consists of a standard electrode capable of measuring the full to 0 to 14 pH range. The electrode comes complete with a small bottle of storage solution to help prevent it drying out. Output is via a BNC connector.
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range of industrial microprocessor-driven instruments with automatic temperature measurement and correction, wall mounting IP65 or flush fitting, with two thresholds, two analogic output functions 4 - 20 mA, available as:
- pH meter
- millivolt meter (Redox)
- conductivity-meter
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pH, Redox, Low and High Conductivity, Dissolved Oxygen, Chlorine, Ozone, Turbidity and Ión Selective
Several versions are available to measuring and to transmit these signals:
• Specific Version for pH / Redox
• Specific Version for Conductivity
• Specific Version for Dissolved Oxygen
• Specific Version for Chlorine, Ozone
• Specific Version for Turbidity
• Specific Version for Ion Selective
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Single channel transmitter for glass and antimony pH electrodes, or redox measurement. Simple to use with large graphic display and easy programming. Auto diagnostics for true measurement of electrode impedance.
Wide choice of temperature compensations.
-Auto calibration in standard buffers.
-0 to 20mA or 4 to 20mA outputs
-Bi-directional proportional controller for pulse contact or frequency output
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utech Instruments' Differential pH/ORP Measurement Technology consists of the alpha pH 2000D controller and a pH/ORP differential electrode. Unlike conventional combination electrodes, the differential electrode is designed for more durability in harsh industrial environments such as
wastewater treatment.
The unique electrode design prevents fouling of the reference electrode system.
The salt bridge and reference solution is replaceable hence providing greater reliability, better accuracy and a more cost effective measurement system.
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Hand-Held pH, Redox, Temperature Measuring Unit HND-R
Liquid Filled pH Combined Electrode, APS-X2Q
Gel-filled pH-Combined Electrode APS-X1Q
pH Electrode with Plastic Sheathing, APS-X5K
Gel Filled Combined Electrode, ARS-X1Q
Transmitters for pH-Value and ORP, APM-X
Gel-filled pH-Combined Electrode APS-Z
Transmitters for pH-value APM-Z
Gel Filled ORP Electrode, ARS-Z
Transmitter for ORP, ARM-Z
ORP Electrode with Plastic Sheathing, ARS-X5K
Inductive Conductivity Measuring Cell ACS-X0I
Hand-Held Conductivity Measuring Unit HND-C
Conductive Conductivity Measuring Cells, ACS-X
Transmitter for Specific Conductivity, ACM-X
Conductive Conductivity Measuring Cells, ACS-Z
Inductive Conductivity Measuring System, ACI-Z
Transmitter for Specific Conductivity, ACM-Z
Accessories for Analysing Devices
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Microprocessor-controlled instrument amplifier with integrated controller for water analysis of:
pH
Redox
Ion concentration
Electrolytic conductivity (conductive and inductive)
Active chlorine concentration
Total chlorine concentration
Chlorine dioxide concentration
Oxygen concentration
Ozone concentration
Hydrogen peroxide concentration
Features:
Backlit 2-line alphanumeric LC display with measuring units
Clear text human-machine interface with only 5 touch keys
Password protection against unauthorized operation
Temperature compensation manual or via Pt 100 / 1000 / NTC 22 kOhm (3-wire)
Galvanic separation of inputs and outputs
2 analog outputs, user configurable
Integrated controller with 2 switching points
2 limit switches with time-delay, allocated to alarm relay
Display of operating and status messages
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For monitoring process waters, wastewater treatment plants, and the quality of drinking waters, surface and underground waters.
Conductivity Range : 0-200 ; 0-2 000 ; 0-20 000 ; 0-200 000 µS/cm.
Standard delivery with a sensor with 4 electrodes (2 platinum and 2 graphite) and with a cable of 3 meters (up to 30 meters). For cable length over 30 meters, you must choose the sensor with an integrated amplifier (max. 110 m).
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This economically designed meter is ideal for use in process control monitoring or anywhere a small, accurate meter is needed. The VARIO is small, light, handy, waterproof and has a robust firmgrip rubber armoring.
Miniature precision, the VARIO Cond Sets:
• The VARIO Cond KIT with 4 electrodes conductivity cell: The globally renown measuring cell TetraCon® 325 was specially shortened and modified for the VARIO Cond. Therefore very precise measurement in the range from 10 µS to 200 mS can be done.
• The VARIO Cond KIT with ultrapure water cell and flow-through vessel: A 2 electrodes stainless steel cell for ultrapure water with plug head and flow-through vessel and a cell constant of 0.1 enables measurements down to 0.1 µS.
Increased precision through the omission of cable connectors – the VARIO Cond is suitable for all measuring tasks for drinking water, process technology, semiconductor technology or pharmaceutical industry.
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electrical current. As the ranges in aqueous solutions are usually small, the basic units of measurements are milliSiemens/cm (mS/cm) and microSiemens/cm (µS/cm).
Conductivity is used widely to determine the level of impurities in water supplies for domestic consumption as well as industrial use. Industries that employ this method include the chemical, semi-conductor, power generation, hospitals, textile, iron and steel, food and beverage, mining,
electroplating, pulp and paper, petroleum and marine industries.
Specific applications include chemical streams, demineraliser output, reverse osmosis, stream boilers, condensate return, waste streams, boiler blowdown, cooling towers, desalinisation, laboratory analysis, fruit peeling and salinity level detection in oceanography.
Some applications require the measurement of Total Dissolved Solids (TDS) in mg/L, parts per million (ppm) or parts per thousand (ppt). The TDS concentration can be obtained by multiplying the conductivity value with a factor which is empirically determined. The total TDS is a mass estimate and is dependent on the mix of chemical species as well as the concentration while Conductivity is only dependent on the concentration of chemical species.
Eutech offers a wide range of conductivity meters for these various applications.
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Conductivity handheld instrument
- Automatic or manual temperature compensation
- 4 measuring ranges with automatic changeover
- min/max value memory, hold function
description
All-purpose portable instrument for measurement of conductivity and temperature. Sensor with integrated temperature sensor is attached.Sensor, instrument and portable case are included in delivery.
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HI 8633 and HI 8733 have been designed specifically for use in areas of production and quality control. It is often necessary to test samples with different concentrations ranging from deionized water to brine.
The amperometric system would require constant recalibration and probe changes, thus making the measurement process very time consuming and unreliable. To solve this problem, HANNA instruments has developed the HI 8633, which uses a 4-ring potentiometric probe. The rugged probe is made of PVC - ideal for indoor, as well as outdoor measurements.
By using one point calibration, it is now possible to obtain accurate readings across a very wide range, from 0.1 to 199900 µS/cm.
If temperature of the solution fluctuates, HI 8733, with a built-in temperature sensor and Automatic Temperature Compensation, is the perfect instrument.
As an accessory, HI 721313 is available. The kit includes a rugged carrying case with a beaker, a calibration screwdriver and standardizing solution at 12880 µS/cm.
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Routine conductivity meter
Basic conductivity meter for routine measurement with outstanding performance: The large display with the easy-to-understand symbols provides the user with a clear overview and useful features otherwise available only with stationary laboratory instruments.
Routine conductivity meter
* Automatic endpoint recognition
* Automatic temperature compensation
* Data memory for 30 GLP data points
* Clear display of measured value and settings
* Complete range of electrodes
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ProfiLine 3000: New Single-Parameter Handhelds from WTW
WTW GmbH proudly announces their new ProfiLine 3000 series of single parameter handheld instruments.
All models have a rugged waterproof housing with IP 66/67 protection class. A separate battery compartment allows easy exchange of batteries or the use of rechargeable batteries. A technical highlight is the special silicone keypad with sealed surface and the feeling of “real” keys. It provides an excellent operation and is easy to clean. The instruments have continuous operation times of up to 2500 h with one battery pack (4 x 1.5 V AA).
Three model lines are offered:
• The 3110 Series for pH or conductivity measurement are functional and easy-to-use handhelds for standard measurements.
• The 3210 Series for pH, D.O. or conductivity measurement has a backlit graphical display, a plain text menu and a special CMC function to ensure that the measurement is taken within the calibration range. The series also has enhanced measurement capabilities.
• The 3310 Series for pH, D.O. or conductivity measurement is a true highlight: An automatic datalogger with memory for 5000 records and a 100% waterproof USB interface make them perfect for long-term recording in the field and for fast data transfer to a laptop or P
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pH, mV, ISE, Oxygen, Conductivity: The new Multi 350i can measure all of these parameters. If desired, pH, oxygen, conductivity and temperature can be measured simultaneously: In the Laboratory using the combined conductivity/oxygen sensor ConOx, in the field with the multiparameter probe MPP 350. All current WTW pH, combination ISE’s, oxygen and conductivity sensors can be additionally connected.
High resolution, high precision, simple, menu-driven operation. Even in poor lighting conditions the backlit graphics display provides clearly readable values. A datalogger, memory for 1,800 data sets and a real-time clock support GLP requirements.
Includes built-in NiMH rechargeable battery for up to 1,000 hours of continuous measurements and appropriate line adaptor.
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Rugged and easy-to-use pH-Meters designed to be used in severe conditions.
UP- Meter are available in two versions:
UP-5A, UP-10A und UP-25A includes Meter and 9V battery
UP-5, UP-10 and UP-25 includes pH-combination electrode 301423-1 and 9V battery
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M6/PH w/PLK Litho-Kit
On-The-Spot Testing
The increasing use of alcohol-free and alcohol-reduced fountain solutions puts new importance on monitoring conductivity, pH and temperature. The easy-to-use Litho-Kit with M6/pH instrument allows you to immediately make these important tests. It's your self-contained, quality control "tool" for fountain solutions.
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Tecpel pH meter Model: pH-873 high accuracy pen type PH meters uses combined pH electrode of high sensitivity , fast response, and good repetition as probe. With 3 1/2 liquid crystal digits display, the meter is reliable, stable, portable, and convenient to operate, especially for field measuring. This product has been well sold world wide in batches.This pH meter is with Automatic Temperature compensation(ATC) and temperature display for easy operaiton.
Features
Easy-to-read Custom Dual-level LCD
On-the-spot measurement
Automatic Temperature Compensation
Stability Indicator
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pH-709 Feature:
1. Microprocessor based for fast and accurate
measurements.
2. Special viewing angle designed of waterproof
housing IP 67 rated.
3. Large LCD display pH or Conductivity and
Temperature Simultaneously.
4. Simple to calibrate by one keyboard and
automatic temperature compensation.
5. Multi-functions with Data-hold, Max/Min and
shows PTS after calibration.
6. Low battery and consumption indicator.
Auto power shut off after 10 minutes of non use.
7. Easy to replace electrode module and the type of
electrode would be recognized automatically and
shown in display during insertion.
pH-709 Specifications:
Specifications: pH-709
Range / Accuracy:
pH Range : -2 ~ 16.00 ± 0.01 + 1digit
mV: -1000 ~ 1000 ±2 + 1digit
Temp. 0 ~ 90 deg C. ± 0.2 + 1digit
Resolution pH: 0.01 mV: 1 Temp: 0.1
ATC 0 ~ 90 deg C.
Calibration pH 4.00, 7.00 10.00
Accessory:
Sensor : Installed.
Standard Solution: pH4 & pH 7
Soaking Solution: One can
Power DC1.5V x 4 battery size:AAA/UM-4
Optional : ORP electrode
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Built-in Smart chip offers advanced functions and features to a stick style pH meter not found anywhere else
* The only stick style meter with:
RENEW feature that tells you when it’s time to replace your pH electrode
CAL feature that tells you when it’s time to recalibrate your meter
Flat Surface pH electrode that is completely waterproof and rugged enough to withstand harsh environments
Analog bargraph originates at neutral point (pH 7.00) to conveniently view trends in acidity or alkalinity
* ATC plus measures Temperature
* 1, 2 or 3 point calibration
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test and simulation device
- Controlling of pH- and ORP sensors
- Controlling of pH and ORP inputs and cables
description
pH and mV simulator to check pH and ORP measuring instruments and electrodes. Complete set: simulator with cable and adapter in a portable case is included in delivery.
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Hach sensION1 pH Meters feature:
* 1, 2, or 3 point calibration
* Resolution to 0.1, 0.01, and 0.001, for the right accuracy when you need it
* Fast responses in pH; true pH averaging
* Automatic buffer recognition
* Measures/compensates temperature in °C or °F
* Electrode holder
* Backlit screen
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HI 991003 is the first pH meter that can measure pH, pH-mV (to check the electrode status), ORP and temperature with only one probe.
Since ORP measurements are strongly effected by pH levels, HANNA instruments has developed the first meter that simultaneously measures both ranges. With all other instruments you need to switch the pH electrode with an ORP electrode (or vise-versa) and, therefore, it is impossible to have both measurements at the same time.
HI 991003 is largely used to control plating bath waste water, swimming pool water quality and potable water sanitizing processes.
HI 991003 is provided with our unique Sensor Check feature that allows the user to establish the status of the pH electrode before performing measurements. The Sensor Check feature consists of a pH-mV scale that shows the characteristics (slope and offset) of the sensor, allowing the user to determine if the electrode is in good condition.
HI 991003 is protected in a waterproof casing for use in humid and wet environments. It also features a large dual-level LCD that displays pH or ORP and temperature readings simultaneously.
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Orion 3-Star Plus Portable pH Meter
This waterproof, battery-operated pH meter stands up to the most demanding field applications and delivers over 2,000 hours of continuous operation. Convenient Quick-Start Guide is located on the back of the meter to make the unit easy to operate in the field.
Featuring automatic or 1 to 5 point manual calibration, the rugged meter offers a full complement of GLP-related features. You can record and store up to 10 setup parameters and calibrations—a valuable feature for fast measurements in the field.
Additional features:
IP67 waterproof (may be immersed for up to one hour with no water incursion)
Waterproof BNC pH electrode connectors
Automatic or manual pH calibration with 1 to 5 calibration points
Auto-buffer-recognition of NIST/US and DIN buffers
Advanced self-tests on meter operation and self-diagnostics
200 point datalogger which is downloadable to printer or computer via RS232 or USB interface optional
CE, CSA, UL, T? and FCC Class A limits approved
Three-year replacement warranty.
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Eutech offers a wide range of pH meters that measure pH values in various educational, laboratory and industrial applications. These include the pHTestr™10, 20 and 30 pocket testers, portable meters CyberScan Series pH 300, pH 310, pH 11 and pH 110, EcoScan pH 6 and the CyberScan bench meter series 510, 1100, 2100, 1500 and the colour touchscreen research-grade series 6000.
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Rugged refillable flat surface pH electrode
* Refillable pH electrode that can be reused by refilling the reference solution once it depletes
* Obtains continuous high accuracy using fresh reference solution
* Fast and easy steps to refill your electrode
* Eliminates the concern of electrode shelf life
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Titrando %u2013 touch the future
Titrimetry - one of the oldest analytical methods - has lost none of its relevance despite the introduction of many analytical methods. This is due not only to the unique advantages offered by the titration method but also to the advanced development in instrumental titrimetry.
The Metrohm titrator family Titrando offers state-of-the-art technology for modern laboratories. It is entirely oriented towards quality control of management in the laboratory and offers control of the rights of access and complete traceability up to the 'calibration history' of the sensors. It meets the requirement of GLP/GMP and 21 CFR Part 11.
Operating the Titrando System is simple and intuitive. No matter whether you operate the Titrando with the Touch Control or via a PC and a mouse - both appearance and operation are practically identical. The system's operator guidance can be regarded as exemplary.
The Titrando system expands to meet your requirements:
The basic unit consists of a Titrando with one measuring interface. This basic unit can be extended to form a super-titrator that controls up to 12 burets and boasts 6 galvanically separated measuring interfaces.
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pH-meters, Conductivity meters
