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Liquid Analyzers
Analyzers

Liquid Analyzers

Liquid Analysis Solutions for Reliable Process and Water Quality Measurement

Explore analyzers, sensors, and measurement systems for pH, ORP, conductivity, dissolved oxygen, chlorine, turbidity, and other critical parameters. Yokogawa liquid analysis solutions help industrial facilities monitor water quality, support process control, protect equipment, and make informed operating decisions.

Liquid Analyzer Sensor Wiring Guide

Need help figuring out the best wiring for your liquid analyzers? This guide makes finding the correct wiring for your Yokogawa supported liquid analytical sensors simple.

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Detalles

Liquid Analyzer FAQ

What Is a Liquid Analyzer?

Liquid pH ORP analyzers and conductivity analyzers are used for monitoring process chemistry including water quality, providing process optimization and control. Common measurements include pH, ORP, conductivity, resistivity, percent concentration, and dissolved oxygen.

What Are the Industrial Applications of Liquid Analyzers?

Liquid analyzers are used across a wide range of industries for water quality monitoring, process water analysis, and continuous measurement of key parameters such as pH, ORP, and conductivity. Common applications include chlor-alkali production, brine manufacturing, paper mill headbox monitoring, sugar refining, and wastewater monitoring in dairy processing. By providing real-time measurements, liquid analyzers help improve process efficiency, product quality, and operational reliability.

What Is Conductivity in Water Treatment?

In water treatment, water must pass a conductivity test to see if it passes an electrical current. Conductivity in water is related to inorganic solids, including ions carrying a negative charge (chloride, nitrate, sulfate, phosphate anions) and ions carrying a positive charge (sodium, magnesium, calcium, iron, aluminum cations). The conductivity level of water is also dependent on temperature.

What Are the Benefits of Liquid Analyzers?

Liquid analysis is essential for protecting critical and essential assets including boilers and cooling towers, by preventing corrosion, minimizing maintenance, and maximizing uptime. Yokogawa is a recognized world leader for reliable liquid analytical equipment, providing accurate and repeatable solutions for maintaining and controlling even the most demanding process optimization and control applications with unparalleled ease of operation.

What Measurements Can a Liquid Analyzer Perform?

Modern liquid analyzers can measure a wide range of process and water quality parameters, including pH, ORP (oxidation-reduction potential), conductivity, resistivity, dissolved oxygen, turbidity, free chlorine, and percent concentration. These measurements help operators monitor process conditions, improve product quality, optimize chemical usage, and maintain regulatory compliance.

Why Is pH Measurement Important in Industrial Processes?

pH measurement is critical for controlling chemical reactions, protecting equipment from corrosion, optimizing treatment processes, ensuring product quality, and meeting environmental regulations. Accurate pH monitoring is widely used in applications such as water and wastewater treatment, chemical processing, food and beverage production, power generation, and pharmaceutical manufacturing.

How Often Should Liquid Analyzer Sensors Be Calibrated?

Calibration frequency depends on the measurement type, process conditions, regulatory requirements, and desired level of accuracy. Harsh process environments may require more frequent calibration, while stable applications can often operate longer between maintenance intervals. Regular calibration helps ensure measurement accuracy, improve process reliability, and maintain consistent product quality.

How Do Liquid Analyzers Help Reduce Operating Costs?

Liquid analyzers help reduce operating costs by improving process efficiency, minimizing chemical consumption, preventing corrosion and equipment damage, reducing maintenance requirements, and avoiding unplanned downtime. Reliable, real-time measurements enable better process control, helping facilities maximize productivity while lowering overall operating expenses.

Recursos

Casos de Éxito
El Sistema SCADA Lleva a una Nueva Planta Municipal de tratamiento de agua en Bali un nivel superior de Operaciones
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Descripción General:

Suministro de Tratamiento de Agua
FAST/TOOLS, STARDOM, Medidores de Flujo, Analizadores de Líquido

- La Planta de tratamiento de aguas de Bali decidió utilizar la última versión confiable del sistema de control con el fin de incrementar la disponibilidad y la calidad de la operación.

- Sistema de Control Centralizado que utiliza FAST/TOOLS provee una operación sofisticada y flexible.

Industrias:
Aplicacione
Monitoring pH at the Headbox
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Descripción General:

Problems at the wet end of a paper machine can rarely be corrected downstream. That is why monitoring and controlling pH in pulp stock is critical to the paper-making process. Essentially, at every stage in the manufacture of paper, correct pH values play a vital role. Variations in the pH value at the headbox have a negative effect on the quality of the paper produced. Proper monitoring ensures minimizing plugging and fouling problems that occur with pH measurements in paper mills. 

Industrias:
Aplicacione
Dairy Wastewater Processing
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Descripción General:

Dairy wastewater is a mixture of organic compounds, suspended solids, fats, and bacteria that can produce a film or coating on equipment in the process. 

Industrias:
Aplicacione
Cooling Tower: ORP Control of Chlorine
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Descripción General:

Optimizing ORP measurements for reliable chlorine control in cooling tower applications is essential for maintaining water quality, preventing corrosion, and ensuring work health and safety.

Industrias:
Aplicacione
Optimizing pH Control for Consistent Pigment Quality
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Descripción General:

Yokogawa’s Process Liquid Analyzers series helps pigment producers achieve more reliable, accurate pH analysis in industrial bioprocesses, improving product quality while lowering total operation costs.

Industrias:
Aplicacione
Optimizing pH Measurement in Styrene-Butadiene Crumb Slurry
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Descripción General:

How integrating advanced pH sensors with temperature compensation, chemical resistance, and a dynamic mounting system can prevent fouling and damage.

Industrias:
Medios de Comunicación
Factors Affecting Reverse Osmosis Operation
(BN-P-20211012-01)
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Edition 1 1
Industrias:
Tutorial
Back to Basics Webinar Series
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Descripción General:

Are you trying to decide how to tackle that next challenging application? Join our Back to Basics webinar series as we review the fundamentals behind different measurement technologies. We will discuss recommended practices, application selection, and sizing, and how to avoid common pitfalls. Gain insight directly from our experts!
Which Input Module do I order for my FLXA21/202 analyzer?
The input module you need depends on the Model Number of your FLXA Analyzer.
Descripción General:

The input module you need depends on the Model Number of your FLXA Analyzer.
PH150 Forgot Password?
(KB-000-0209)
The PH150 allows the use of passwords to limit access to the Calibration functions and access to the Configuration functions. If these functions have been protected with a password and the password is not available there is a way to bypass the prote...
EXA450 Error 130, Error 131
(KB-000-0218)
Error 130 & 131 are display errors. The PH450 calibrates the display each time it powers up. Error 130 or 131 means this calibration failed. Cycle the power to the unit and allow it to calibrate the display again. If after 6 times the error is st...
I am seeing an Err-2 on my pH instrument. What does it mean?
(KB-000-0223)
An Error 2 means that the calculated asymmetry potential is outside the acceptable range. The Asymmetry Potential (AS), also referred to as the millivolt offset, is an indication of the condition of the reference electrode. Theoretically when the ele...
I am getting an Err-3 on my pH instrument. What does it mean?
(KB-000-0224)
The Error 3 is related to the slope value on a pH loop, indicating that the slope value is outside of the allowable range. The Slope (SL), also referred to as the efficiency of the electrode, is an indication of the condition of the pH electrode. The...
Is it possible to remove air bubbles from inside a pH probe?
(KB-000-0239)
Air bubbles are normal in pH sensors and in some reference sensors. They are necessary because the pH sensor is a sealed device with no vent. Without the air bubbles the expansion and contraction of the liquid with temperature changes could cause the...
Do the new Differential Cation sensors need to be recalibrated regularly?
(KB-000-0241)
Yes. The Cation Differential pH and ORP sensors have a glass electrode that needs a 2 point calibration performed regularly. Because of the Cation Reverence electrode you must use special buffers with a constant sodium ion concent...
Errors resulting from cracked glass electrodes.
(KB-000-0244)
A tiny crack in the membrane of a glass electrode is not always visible to the naked eye. Frequent shocks may create cracks in the glass that cause measurment errors. These cracks will cause the analyzer to read 0 mV and the ...
Errors caused by wet cables or bad connections.
(KB-000-0245)
It is very important that the cables maintain a very high impedance. If any moisture penetrates the cable the impedance will drop and the cable will short out the voltage generated by the pH sensors. This will cause errors or a total loss of mea...
Errors caused by shorting the electrode cables
(KB-000-0246)
Often, Instrumentation technicians like to shorten cables to match the installation. This is strongly discouraged with Analytical Sensors. Yokogawa has designed cables with a special layer of conductive plastic to ensure maximum noise ...
What happens if we combine a measuring electrode with 3.3 mol KCl electrolyte with a reference electrode with 1 mol KCl in a pH sensor or vice versa?
(KB-000-0262)
The reference potential difference between 1 molar and 3.3 molar is approximately 30 mV. The sensitivity of a pH sensor at reference temperature is 59mV/pH. So if you combine a measuring cell filled with 3.3mol KCl with a reference cell with 1mol KCl...
What is the shelf life of a buffer solution? How long does it last after the bottle is opened?
(KB-000-0278)
Yokogawa's buffer solutions have a guaranteed shelf life of 12 months from the date of shipment. The exception to this is the sodium buffer solutions used to calibrate the differential pH sensors (part numbers K1520BF, K1520BG, K1520BH, K152...
How many pH analyzers can I calibrate with the same buffer solution?
(KB-000-0280)
We recommend using pH buffers only once. If you want to use the same buffers for more analyzers, then you must avoid contamination of the buffers by the sensors. The sensor must be cleaned and washed carefully before inserted into the buffer. A senso...
Is it possible to connect competitor's sensors with Yokogawa analyzers? If yes, what are the conditions?
(KB-000-0287)
All Yokogawa analyzers use an open architecture with adjustable temperature compensation, adjustable isopotential point, and adjustable slope. They are compatible with all direct pH, ORP, and conductivity sensors. There are two exceptions to th...
Can I improve the life of pH sensor when I choose 225 mm electrode in place of 120 mm electrode?
(KB-000-0311)
That is possible but not guaranteed. The 225 mm sensor body is longer, so it has more electrolyte. Often the reference electrode fails because the electrolyte is depleted as it diffuses through the reference junction into the process. With ...
Can we mount pH sensors upside down?
(KB-000-0312)
Most pH sensors with a glass membrane cannot be mounted upside down. To absorb the thermal expansion of the internal buffer solution there is always a sizeable air bubble inside the sensor. When the sensor is mounted upside down the reference element...
Does Yokogawa offer a nonglass pH electrode?
(KB-000-0313)
Yokogawa offers the PH18 sensor. This sensor is nonglass and suitable for regular CIP and SIP cycles. ...
In a dual input FLXA202 or FLXA21 analyzer, how can I see the values from the second input module?
(KB-000-0316)
In a dual input FLXA202 or FLXA21 analyzer you can use a HART Splitter to convert the HART® dynamic variables into current outputs or contact outputs. The model number is "1W-KFD2-HLC-EX1.D" and the description is "P+F HART Splitte...
Can we use a pH analyzer as a temperature analyzer? If so, how?
(KB-000-0317)
Yokogawa's pH and conductivity sensors include a temperature sensor to allow for temperature compensation. The pH and conductivity sensors have a relatively large temperature mass and respond slowly to the changes in the process temperature. This...
How accurate is your pH analyzer?
(KB-000-0319)
Generally we state that the pH analyzer is as accurate as the care that is given to the device allows. With lots of care you can achieve 0.05 pH accuracy. With normal care you achieve 0.1 pH Without care the measuring error can be pH 0.5 or more...
Where do I find documentation for the PH150?
(KB-000-0366)
The PH150 and SC150 were discontinued in 2004. The Manual and General Specification sheet are no longer available on Yokogawa's website. Use this link to download a zip file containing both documents.
Where do I find documentation for the TM20?
(KB-000-0370)
The TM20 pH meter was discontinued over 20 years ago, but the manual is still available.  If you have trouble downloading it, send us an email at yca-support@yokogawa.com or call 800-524-7378.
FLXA21 or FLXA202 Check Sum Error
(KB-000-0372)
First, check the grounding. A bad ground can cause this failure.  Next: cycle the power to the unit. Shut the power off for 30 seconds then restart.  If that doesn’t clear the error reset the analyzer to factory defaults. Be ...
Which is more accurate when performing an ORP calibration: one point or two point?
(KB-000-0376)
Performing a two point calibration for an ORP sensor may make a user more confident in the measurement because it ties the measurement to two known millivolt values, offsets and slope values. When performing a pH calibration, the 2nd point&...
SC150 - Lost or Forgot the Password
(KB-000-0385)
If you have lost the password for your SC150 you can use password   #PW123#   to get into the menu. The next thing you should do is to reset the password.
PH200, SC200, IC200, PH202, SC202, IC202, ISC202, PH402, SC402, DC402, IC402, ISC402, DO402, GD402 - forgot password
(KB-000-0389)
If you forget the password you have set in one of these transmitters there are only 9 passwords that can be set.  The password setting on the unit is a little difficult to understand. When you put a 3 digit code in service code 52 you are setti...
Conductivity Sensor Cleaning
(KB-000-0391)
Soak the sensor in 5 - 10% Hydrochloric acid (HCl) in water solution. for 5 - 10 minutes, then rinse. If you have trouble finding 5 - 10% HCL you can buy muriatic acid at a building supply house and it is usually 20 - 30% HCL. Check the label. Dilute...
FLXA21 or FLXA202 - PH, Conductivity, ISC, or DO Transmitters - Forgot Password
(KB-000-0393)
If you forgot the password to your FLXA Transmitter you can use the password #PW123# - this will allow you go into the menus. Remember to change or remove the password.
SC200/202/400/402/450/FLXA21/FLXA202/DC400/DC402 Testing or simulating a contacting conductivity input
(KB-000-0394)
To test the conductivity input do the following:  Write down the cell constant and change it to 1.00 (this is not mandatory, it makes the math easier)  Place a jumper wire between 13 to 14 and another one on 15 to 16 (not necessary on t...
DC402 Turning off alarms on unused second input
(KB-000-0395)
There is no way to "turn off" an unused input on a DC402. If you leave the terminals open you will get error messages.  Connect a simulated sensor to the unused input to clear the errors. Use a resistor on 11-12 to simulate the t...
What is the difference between a SC41 and a SC42 sensor?
(KB-000-0397)
The difference is the temperature sensor. The SC41 has a Ni100 temperature element and the SC42 has a PT1000 temperature element. PT1000 is a better temperature element, but some old electronics will not accept a PT1000 temperature element, so the SC...
Where do I find documentation for the SC150?
(KB-000-0402)
Use the link at the top of the page to download a compressed (ZIP) file containing the GS Sheet and Manual for the SC150.
How to test a ISC40G sensor
(KB-000-0404)
With an Ohm meter check the following wires on the ISC40G sensor cable: 11 to 12 (Pt1000 or Thermistor) 13 to 17 – Sensor coil – expect low resistance. If unstable or above 100Ω it is bad. 15 to 16 - Sensor coil – ex...
How can I test an ISC Converter?
(KB-000-0405)
You can test the ISC converter by simulating a conductivity reading using an ISC40 sensor. You will need: A known working ISC40 sensor. A piece of wire One or two decade box/resistance sources. Connect sensor wires 13-17 to analyzer. ...
Where do I find documentation for the DO400?
(KB-000-0406)
Click the link at the top of the page to download the DO400 Manual.
Oxygold G DO sensor Maintenance
(KB-000-0407)
How to startup a new sensor, or how to replace the Membrane Cap and Electrolyte.   Startup of a new Oxygold G sensor: The Oxygold G sensor is shipped dry with a protective cap over the end of the Membrane Cartridge. CAUTION: The electrolyte ...
Can pH and ORP be measured simultaneously?
(KB-000-0321)
Most of our pH sensors have a noble metal solution ground and our transmitters measures two values: 1.  the voltage between this solution ground, or liquid earth sensor and the pH sensor, and 2. the voltage between this solut...
How can be the process reading be wrong when it is correct in the pH buffers?
(KB-000-0324)
This is a well-known pH problem that we call Diffusion Potential. If the sensor junction is partially plugged the electrical contact between electrolyte and process is not good. This results in a high diffusion potential and an error i...
Can a reference electrode be stored in demineralized, deionized, or distilled water?
(KB-000-0325)
NO!  Sensors that are not used need to be stored in a solution that guarantees that the sensor is ready for use. When the sensor is stored in pure water the salt will be washed out of the junction of the reference cell. This causes the sensor t...
Do I need to re-calibrate after cleaning my pH-electrode?
(KB-000-0328)
Yes and No.  Yes - after cleaning you need to verify that the analyzer is reading correctly. The easiest way is to see how it reads when placed in 2 pH buffer soltuions. This is what you do when calibrating.  No - If the readings are with...
How to refill a SR20-AC32 Bellomatic sensor? How to remove the electrode from the top of a Bellowmatic sensor if it is stuck?
(KB-000-0331)
First - when you receive a new Bellomatic sensor it is shipped with a rubber stopper inserted into the pressure port on the bottom of the sensor. You must remove this stopper before putting the sensor in service. DO NOT DISCARD THIS STOPPER! Put it i...
Can the FU20F or FU24F SENCOM sensors be used to measure pH and ORP at the same time?
(KB-000-0345)
Yes, the SENCOM Module in these sensors allows a Modbus Master to connect using Modbus RTU protocol and access the following data: pH Temperature compensated pH ORP pH compensated ORP rH Temperature Junction resistance value Sensor details ...
FU20, FU24 or PH20 looks like it leaked in the box
(KB-000-0364)
Can I use my FU20 or FU24 pH sensor in a Tank by just dropping it in the tank?
(KB-000-0365)
The short answer to this question is NO. But, there is a long answer that will give you another option. Yokogawa has created a Submersible Sensor Kit (part number M1289XT) for the FU20 pH sensors - M1289XU for the FU24 sensor). It is also known as ...
PH Sensor Cleaning
(KB-000-0380)
Cleaning pH Sensors Basic Steps  Rinse electrode in clean water Clean by immersing the electrodes in a cleaning solution (see below).  Rinse Again Check with buffers Cleaning Solutions: If you know a specific way to clean the sens...
What is the expected lifetime of a pH sensor?
(KB-000-0382)
Sensor lifetime is difficult to predict as it is dependent on a number of different factors such as pH value, temperature, pressure, the composition of the process liquid, maintenance activity is taken, storage conditions, and sensor handling. ...
Descripción General:

Sensor lifetime is difficult to predict as it is dependent on a number of different factors such as pH value, temperature, pressure, the composition of the process liquid, maintenance activity is taken, storage conditions, and sensor handling.
I have a pH sensor that does not have a solution ground. Can I use it with a Yokogawa Transmitter?
(KB-000-0384)
Yes you can, but we do not recommend this method. A pH sensor has a reference electrode that has a low impedance to the process. If the process suffers from common mode voltages or ground loops it will be difficult to measure the ...
How to order a FF20 with a FU20 pH Sensor.
(KB-000-0408)
The FF20 flow through holder for PH can be ordered using the "pH Selection Guide Matrix" so that an entire system can be ordered with one line item. This does not work if you want a FF20 with an FU20 sensor. The Matrix does not contain the ...
ZA8C I forgot the password to get into Maintenance mode
(KB-000-0435)
The password to get in all the maintenance and commissioning menus is 16 
ZR22S: Option "B" Adder
(KB-000-0438)
This is the Japanese GS sheet, containing a number of options we rarely sell here in the US. Contact Support at 800-524-7378 or support@us.yokogawa.com for price and delivery information.    ...

Documentos y Descargas

Catálogos
Manuales
Especificaciones Generales
Información Técnica
Certificados

Videos

Información del Producto
SENCOM- The Next Generation in SMART Liquid Analyzers
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Descripción General:

SENCOM- The Next Generation in SMART Liquid Analyzers

Yokogawa’s SENCOM SMART Sensor Platform is an innovative analyzer platform that optimizes maintenance, reduces configuration time, and simplifies in-field maintenance and calibration. Yokogawa is a recognized world leader for reliable liquid analytical equipment, providing accurate and repeatable solutions for maintaining and controlling even the most demanding process applications.
Webinars
The Mystery of the Very Nearly Impossible pH Measurement
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