E+H's conductivity product system can be divided into three major categories by function: conductivity sensor signal detection, conductivity transmitter signal processing, and calibration kit maintenance and calibration. The product functions are clear, and the combination of sensors and transmitters can achieve more functions. The specific classification is as follows:
Before the introduction, let us first understand the difference between analog and digital electrodes.
The main differences between analog sensors and digital sensors are:
In terms of communication, analog relies on analog signal transmission through physical contact and is susceptible to interference, while digital realizes digital transmission through non-contact induction, is anti-interference, and requires a Memosens transmitter;
In terms of data storage, analog cannot store parameters, while digital can store manufacturing, calibration, application, and other parameters and can read them through specific devices;
In terms of operation and maintenance, analog requires on-site calibration, resetting parameters after replacing the sensor, and has no automatic fault detection, while digital supports offline pre-calibration, automatically transfers parameters when replacing the sensor, and can automatically report faults;
In terms of safety and applicable scenarios, analog has no electrical isolation and weak EMC optimization, and is suitable for conventional non-hazardous area measurement, while digital has electrical isolation, EMC safety, and hazardous area certification, and is suitable for complex hazardous scenarios such as chemical plants and power plants.
1. Conductivity Sensors
Conductivity can be further divided into some types, directly inserted into the medium to collect conductivity data, and further subdivided by signal type, number of electrodes, and applicable scenarios. Different models adapt to different working condition requirements:
By signal type
Analog sensors: output analog signals, used with transmitters, low cost, suitable for conventional interference environments. Common models include CLS16B, CLS16, CLS15, CLS50, CLS52, CLS54, CLS13, CLS12, CLS21.
Digital sensors: directly output digital signals, with stronger anti-interference ability, suitable for long-distance transmission or high electromagnetic interference scenarios. Common models include CLS15D, CLS16D, CLS16E, CLS21D, CLS21E, CLS50D, CLS54D, CLS82D, CLS82E.
Analog sensors are cheaper than digital ones, but have fewer applicable scenarios.
By number of electrodes and structure
Conventional electrode sensors: most basic models use conventional electrode design, suitable for clean liquids and low-impurity media, covering most of the above analog and digital models, such as the CLS15 series, CLS16 series, CLS21 series, and CLS50 series.
Four-electrode sensors: only CLS82D and CLS82E, using a four-electrode structure. Compared with conventional electrodes, they can reduce the influence of electrode polarization and are suitable for high-conductivity media or scenarios containing a small amount of solid particles, with more stable measurement accuracy.
3. Supplement by applicable scenarios
General-purpose sensors: CLS12, CLS13, CLS15 series, CLS16 series, suitable for conventional scenarios such as municipal water treatment and food processing. They do not require high medium purity and are cost-effective.
Sensors for special working conditions: CLS50 series, CLS52, CLS54 series have stronger temperature and pressure resistance, suitable for scenarios with medium and high temperature and pressure such as industrial circulating water and chemical solutions; the CLS82 series (four-electrode) focuses on high-conductivity or impurity-containing media to avoid measurement deviation.
2. Conductivity Transmitters (processing core: signal conversion + data output)
The core function is to convert the conductivity signal collected by the sensor into a standard output signal, while providing functions such as data display, fault diagnosis, and parameter setting. It is the key device connecting the sensor and the control system. There are only two mainstream models:
CLM223: basic transmitter, cost-effective, supports conventional analog / digital sensor connection, meets scenarios with low functional requirements such as municipal water treatment and civil water purification, and can realize basic conductivity data transmission and fault alarm.
CLM253: advanced transmitter, with stronger anti-interference ability, supports a wider measurement range, and also has data storage and multi-parameter display functions, suitable for industrial scenarios with high requirements for measurement accuracy and stability such as chemicals and pharmaceuticals.
3. Calibration Kit (maintenance core: ensuring sensor accuracy)
Only CLY421, a auxiliary tool specially used for calibrating conductivity sensors. Its core function is to regularly calibrate the measurement accuracy of the sensor — after long-term use, the sensor electrodes will scale and age, causing data deviation. Through standard calibration liquid and operating tools, the sensor accuracy can be restored to the standard range. It is applicable to all E+H conductivity sensors, especially in scenarios with extremely high accuracy requirements such as pharmaceuticals and electronic ultrapure water, where it is an essential maintenance accessory.
Matching logic reference
Conventional scenarios (such as municipal water treatment): analog sensor (such as CLS16) + CLM223 transmitter + regular calibration with CLY421; complex scenarios (such as chemical high-conductivity solutions): digital four-electrode sensor (such as CLS82D) + CLM253 transmitter + high-frequency calibration with CLY421.
When selecting instruments, choose the corresponding instrument according to the corresponding situation. It is not necessarily good to choose some devices with relatively powerful performance.