Portable Reference Tool for Conductivity Verification
The Conducal CLY421 is designed as a reference system for checking conductivity measuring devices rather than as a conventional process conductivity sensor.
It provides a practical way to compare the installed conductivity measurement with a traceable reference measurement using the same process sample. This makes it useful when verification of an existing conductivity measuring loop is required without removing the installed instrument.
Designed for Ultrapure Water
The CLY421 is specifically intended for ultrapure water conductivity measurements up to 20 μS/cm. Its measuring range is specified as 0.04 to 20 μS/cm, making it suitable for low-conductivity applications where measurement accuracy and traceability are particularly important.
This makes the system particularly relevant to applications where conductivity is a quality-critical parameter rather than simply a general process indicator.
Factory-Calibrated Reference System
The CLY421 is supplied as a factory-calibrated measuring case with a certificate for comparison measurements.
Endress+Hauser states that the factory calibration is traceable to standard reference material from NIST and DAkkS, providing documented traceability for verification and calibration activities.
Calibration According to ASTM D-5391
The CLY421 is factory calibrated according to ASTM D-5391, and its flow assembly provides adjustment and monitoring functions according to the same standard.
This provides a standardized reference framework for conductivity verification in ultrapure water applications.
Direct Comparison Using the Process Sample
One of the practical advantages of the CLY421 is that calibration or verification can be performed using the actual process sample.
The process sample is passed through the flow assembly and measured by the reference system, allowing the installed conductivity measurement to be compared directly with the reference value.
Portable Field Calibration
The CLY421 is supplied in a robust portable hard-top case and includes a battery-powered Liquiline transmitter.
This configuration allows the reference system to be transported between measurement points and used for field verification rather than requiring the entire conductivity measuring installation to be taken to a laboratory.
Integrated Flow-Through Assembly
The calibration case includes a flow-through assembly for the conductivity comparison measurement.
The assembly provides the connection point for the process sample and includes adjustment and monitoring functions designed according to ASTM D-5391. This allows the reference measurement to be established in a controlled flow arrangement.
Compact Complete Calibration System
Instead of requiring separate reference instruments, transmitter equipment and accessories to be assembled individually, the CLY421 combines the main components into a dedicated portable calibration case.
The official product information describes the design as a compact case containing a factory-calibrated conductivity loop and flow-through assembly.
Suitable for Quality-Relevant Measurements
The CLY421 is intended for quality-relevant conductivity measurements, particularly where verification and calibration records need to be traceable.
This is important in regulated industries where conductivity measurements can form part of product quality, water-quality monitoring or process release requirements.
Pharmaceutical Applications
The CLY421 is designed to meet the requirements associated with pharmaceutical applications and can be used for calibration of conductivity measuring loops in ultrapure water systems.
This makes it suitable for applications where documented measurement traceability is an important part of the quality system.
Food and Semiconductor Applications
In addition to pharmaceutical applications, Endress+Hauser lists the CLY421 for food and semiconductor industries where ultrapure or quality-critical water conductivity measurements require verification.
Key Features
Portable conductivity calibration and verification tool
Endress+Hauser Conducal CLY421
Designed for ultrapure water applications
Measuring range 0.04 to 20 μS/cm
Suitable for conductivity systems up to 20 μS/cm
Factory-calibrated reference measuring loop
Calibration traceable to NIST and DAkkS
Factory calibration according to ASTM D-5391
Flow-through assembly with adjustment and monitoring functions
Direct comparison using the process sample
Battery-powered Liquiline transmitter
Portable hard-top carrying case
Compact integrated calibration system
CLS15D conductivity sensor included in the measuring loop
Designed for quality-relevant conductivity measurements
Suitable for pharmaceutical, food and semiconductor applications
IP67 protection for the closed case without power cord
Factory calibration certificate supplied
Typical Applications
Pharmaceutical Ultrapure Water
Verification and calibration of conductivity measuring loops used in pharmaceutical ultrapure water systems.
Water Quality Verification
Checking quality-relevant conductivity measurements against a traceable reference system.
Semiconductor Water Systems
Field verification of low-conductivity measurements in semiconductor manufacturing water systems.
Food Industry Water Systems
Verification of conductivity measuring points used for quality-relevant water monitoring in food production.
Conductivity Loop Verification
Comparison of an installed conductivity measurement with the CLY421 reference measurement using the actual process sample.
Calibration and Maintenance
Periodic verification and calibration activities where documented traceability to recognized reference standards is required.
FAQ
What is the Endress+Hauser CLY421?
The Conducal CLY421 is a portable conductivity calibration and verification tool designed for ultrapure water applications. It is used as a reference system for checking conductivity measuring devices rather than as a normal process conductivity sensor.
What is the CLY421 used for?
It is used to verify and calibrate conductivity measuring loops in ultrapure water applications, particularly where conductivity measurement is quality-critical and traceability is required.
What is the measuring range of the CLY421?
The official specification gives a measuring range of 0.04 to 20 μS/cm.
Is the CLY421 a conductivity sensor?
Not in the usual sense. The CLY421 is a complete portable calibration and verification system. Its measuring loop incorporates an Endress+Hauser CLS15D conductivity sensor together with the reference transmitter and flow-through assembly.
Can the CLY421 be used directly with the process sample?
Yes. The system is designed for direct comparison measurement using the process sample, allowing the reference measurement to be compared with the installed conductivity measurement.
Is the CLY421 traceable to NIST?
Yes. Endress+Hauser states that its factory calibration is traceable to reference material from NIST and DAkkS.
Is the CLY421 calibrated according to ASTM D-5391?
Yes. Endress+Hauser specifies factory calibration according to ASTM D-5391, with the flow assembly also providing adjustment and monitoring functions according to this standard.
Which industries use the CLY421?
Endress+Hauser specifically lists Life Science, Food and Semiconductor industries for the CLY421.
Is the CLY421 portable?
Yes. The complete system is supplied in a portable hard-top case with a battery-powered Liquiline transmitter, allowing field calibration and verification.
What conductivity range is the CLY421 intended for?
The CLY421 is intended for ultrapure water applications up to 20 μS/cm, with the reference measuring range specified as 0.04–20 μS/cm.
Does the CLY421 include a flow assembly?
Yes. The complete calibration system includes a flow-through assembly for the comparison measurement.
