Pursuing precise measurement and flexible installation for duct sensors? The 120° swivel flange design effortlessly resolves positioning challenges.
JENNIE | 2025-10-28
In the field of HVAC and building automation, the installation of duct-mounted sensors has always been a troublesome challenge. Engineers often face this dilemma: the installation opening on the duct is not ideally located, and after inserting the sensor, the probe direction cannot face the airflow, resulting in measurement deviations; or the installation space is narrow, causing the sensor housing to interfere with surrounding duct structures, necessitating destructive modifications or even re-drilling.
These seemingly "minor" issues directly affect the accuracy and energy efficiency of the entire control system. So, is there a sensor that can simultaneously achieve measurement accuracy and installation flexibility, truly realizing "install as you wish, measure as you need"? Kunlun Zhongda's answer is: 120° swivel flange design.
Pain Point 1: Limited Installation Direction, Probe Cannot Face the Airflow
The airflow inside a duct often has a certain direction. To obtain representative temperature or humidity readings, the sensor probe should face the airflow direction and be located in the central area of the duct. However, the reality on site is that the reserved opening on the duct may be located downstream of an elbow, at a diameter change, or close to the duct wall. Once a traditional fixed sensor is installed, the probe direction is locked and cannot be adjusted.
Kunlun Zhongda's Duct Mounted Transmitter addresses this pain point with an innovative 120° swivel flange structure. The probe portion of this Duct Mounted Transmitter can rotate freely within 120 degrees. Installation personnel do not need to change the duct opening position; simply rotate the flange gently to accurately align the probe with the airflow direction. A good Duct Mounted Transmitter should not let the installation location compromise measurement accuracy. Choosing the Duct Mounted Transmitter means obtaining true internal duct parameters regardless of where the opening is located.
Pain Point 2: Sensor Housing Interferes with Surrounding Structures in Tight Spaces
In equipment rooms, suspended ceilings, or inside air handling units, the space around ducts is often extremely cramped. Traditional duct sensors typically use a fixed housing. After insertion, the housing may interfere with duct insulation, adjacent pipes, or building structures, making it impossible to fully insert the sensor or difficult to wire and maintain.
Kunlun Zhongda's HVAC Transmitter fully considers the complexity of on-site installation. This HVAC Transmitter features a split design between the flange and the housing, combined with the 120° swivel function. Installers can first fix the flange to the duct, then rotate the housing of the HVAC Transmitter to the most convenient angle for wiring and observation based on the available space. A flexible HVAC Transmitter should not let tight spaces become an installation obstacle. Choosing the HVAC Transmitter means you can still complete installation and future maintenance with ease, even in limited ceiling spaces.
Pain Point 3: Slow Response of Temperature and Humidity Sensors Fails to Reflect Real-Time Changes
Beyond installation challenges, another core pain point of duct sensors is measurement performance. Especially in variable air volume systems or cleanroom control that require fast response, traditional temperature and humidity sensors often suffer from response lag due to excessively long probe sheaths or poor thermal conductivity, failing to reflect real-time changes in temperature and humidity within the duct in a timely manner.
Kunlun Zhongda's Temperature Humidity Transmitter solves this problem through its probe structure. This Temperature Humidity Transmitter uses a high-sensitivity platinum resistance temperature sensing element and a polymer capacitive humidity sensing element, encapsulated in a stainless steel sintered sheath, ensuring both mechanical strength and extremely fast heat exchange.
An excellent Temperature Humidity Transmitter should let you "sense in real time" every degree of change inside the duct. Choosing the Temperature Humidity Transmitter means your air conditioning system can respond more quickly to load changes, achieving more precise temperature and humidity control and higher energy efficiency.
Pain Point 4: Complex On-Site Selection Requires Different Probe Lengths for Different Duct Sizes
During on-site selection, engineers often need to determine the probe insertion depth based on the width or diameter of the duct. If the probe is too short, it cannot reach an effective measurement position; if it is too long, it may interfere with the opposite inner wall of the duct. The traditional solution is to offer multiple fixed-length probes, which means a large number of SKUs and selection work.
Kunlun Zhongda's Duct Mounted Transmitter and HVAC Transmitter both offer customizable probe length options, ranging from 100mm to 500mm, covering the vast majority of rectangular and circular ducts. At the same time, the 120° swivel flange allows the probe to be fine-tuned after insertion, further eliminating measurement blind spots caused by eccentric opening positions. A truly flexible Duct Mounted Transmitter should adapt to different duct sizes, rather than requiring you to re-select for each project.
Kunlun Zhongda's Core Technology: 120° Swivel Flange + High-Precision Sensing
The reason Kunlun Zhongda's duct sensor series has become synonymous with "precise measurement and flexible installation" lies in three core technologies:
First, the 120° swivel flange structure. The probe and housing can rotate independently without interfering with each other. During installation, first fix the flange, then adjust the probe direction, and finally rotate the housing to the appropriate angle. Three steps complete, no tools required.
Second, high-precision temperature and humidity sensing elements. Temperature accuracy ±0.2°C, humidity accuracy ±2%RH, response time τ63 < 8 seconds, meeting the requirements of high-end applications such as commercial buildings, clean workshops, and pharmaceutical manufacturing.
Third, modular probe design. Probe length is customizable and supports on-site replacement without removing the flange or wiring, greatly reducing later maintenance costs.
Technical Specifications
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Temperature Measurement Range: -20°C ~ +80°C
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Temperature Measurement Accuracy: ±0.2°C
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Humidity Measurement Range: 0 ~ 100% RH
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Humidity Measurement Accuracy: ±2% RH (0~90% RH) / ±3% RH (90~100% RH)
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Response Time: τ63 < 8 seconds (humidity) / τ63 < 5 seconds (temperature)
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Output Signals: 4-20mA / 0-10V / RS485 Modbus RTU
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Power Supply: 24V AC/DC
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Probe Length: 100mm / 150mm / 200mm / 250mm / 300mm / Custom
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Flange Swivel Angle: 0° ~ 120° (bi-directional adjustable)
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Housing Material: ABS + Flame-retardant PC (UL94 V-0)
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Protection Rating: IP65 (whole unit)
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Installation Method: Flange fixing + swivel locking
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Applicable Ducts: Circular ducts Ø100 ~ Ø1000mm; Rectangular ducts width 100 ~ 1000mm
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Operating Environment: -20°C ~ +70°C, 0 ~ 95% RH (non-condensing)
Note: The above specifications are standard parameters. Kunlun Zhongda supports custom design and production based on specific customer requirements.
Conclusion
Installation challenges of duct sensors should never be a reason for you to give up precise measurement. Through the three-in-one product system of the Duct Mounted Transmitter, HVAC Transmitter, and Temperature Humidity Transmitter, combined with the innovative 120° swivel flange design, Kunlun Zhongda provides you with a truly "precise and flexible" solution.
Whether you are facing tight ceiling spaces, eccentric opening positions, or variable air volume systems requiring fast response, Kunlun Zhongda allows you to complete installation with ease and obtain truly reliable internal duct parameters. One flange, 120 degrees of free rotation. One installation, lifetime of precise measurement.
Choose Kunlun Zhongda. Stop compromising on duct sensor installation. Make your measurement data truly trustworthy.
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