In the field of industrial flow monitoring，the performance differences between ZK-120 and ZK-TDS-100 wall-mounted ultrasonic flow sensors directly affect system accuracy。This article analyzes the key differences between the two products for technical evaluation personnel from 5 core dimensions，including measurement principle，installation method，signal processing，etc.，helping you precisely match the model selection requirements of ZK series ultrasonic transmitters。

1、Comparison of Measurement Principles and Technical Performance

ZK-120 adopts transit-time ultrasonic measurement technology，calculating the flow velocity by measuring the time difference between downstream and upstream sound wave propagation，with measurement accuracy up to ±0.5% reading，suitable for the DN15-DN6000 pipe diameter range。ZK-TDS-100 is upgraded to dual-mode measurement based on the Doppler effect and frequency difference method，delivering more stable performance in liquids containing bubbles or particles，with accuracy improved to ±0.3%，especially suitable for complex operating conditions such as wastewater treatment and chemical slurry。Both products support 4-20mA/RS485 output，but ZK-TDS-100 is additionally equipped with the HART protocol，offering broader compatibility。

2、Differences in Installation Method and Structural Design

As a wall-mounted ultrasonic flow sensor，ZK-120 adopts a split design，with a maximum distance of 300 meters between the sensor and transmitter，making it suitable for distributed monitoring of large pipelines。Its protection rating is IP65，and its operating temperature is -20℃~60℃。ZK-TDS-100 innovatively integrates a temperature compensation module and adopts an integrated compact structure，with the protection rating upgraded to IP67，enabling stable operation even in extreme environments of -30℃~80℃。It is worth noting that the ZK-TDS-100B model newly adds explosion-proof certification（Ex d IIC T6），and can be applied in hazardous areas such as petroleum and natural gas。

3、Signal Processing and Anti-Interference Capability

Technical evaluation personnel need to pay special attention to the differences in the signal processing system：ZK-120 uses 16-bit ADC sampling and is equipped with a digital filtering algorithm，which can effectively suppress pipeline vibration noise below 50%。ZK-TDS-100 is equipped with a 32-bit ARM processor and adopts adaptive filtering technology，which can dynamically identify and eliminate more than 80% of electromagnetic interference。Actual test data shows that in strong electromagnetic field environments（such as near frequency converters），the measurement fluctuation rate of ZK-TDS-100 is 42% lower than that of ZK-120。

4、Procurement Model Selection Guide and Cost Analysis

Core standards should be selected according to fluid characteristics：for clean liquids，ZK-120 is preferred（higher cost performance，average price about 6800 yuan），while for media containing impurities，ZK-TDS-100 is recommended（average price about 9800 yuan）。For scenarios requiring explosion-proof certification，ZK-TDS-100B is the mandatory choice。Xi'an Shenghongchuang Instrument Co.，Ltd. provides customized services，and can adjust communication protocol combinations for models such as ZK-CSB according to actual requirements，with discounts of more than 15% available for bulk purchases。

5、Industry Application Scenarios and Success Cases

In a large wastewater treatment plant project in Shaanxi，ZK-TDS-100 successfully replaced traditional electromagnetic flowmeters，solving the measurement drift problem caused by fluctuations in sludge concentration，and reducing annual maintenance costs by 60%。ZK-120 performed excellently in the heating pipeline network monitoring system of Xixian New Area，where its split design facilitated installation in narrow valve wells，with cumulative deployments exceeding 200 units。Both products have passed ISO 9001:2015 quality management system certification，and key parameters comply with the JJG 1030-2007 verification regulation for ultrasonic flowmeters。

Why Choose Xi'an Shenghongchuang Instrument

As a national high-tech enterprise，we have 18 years of sensor R&D experience，and all ZK series products use military-grade components。Our professional engineering team can provide full-process services from model selection consultation to on-site commissioning，and the 72-hour rapid response mechanism ensures timely problem resolution。Contact our technical consultants now to obtain a customized flow monitoring solution free of charge，and enjoy an extended 3-year warranty service。