How to solve temperature attenuation in HVAC long pipes?

Is the temperature measurement of HVAC pipelines inaccurate? How to crack long-distance attenuation of TCR3750 thin film platinum resistance?

In the central air conditioning chilled water pipe and underfloor heating water collector pipeline, the temperature measurement film platinum resistance of HVAC pipeline solves the problems of signal attenuation (error>± 2 ℃) and pipeline vibration offset caused by traditional sensor long-distance (>50 meters) transmission through "low internal resistance design+anti-interference packaging"

H2: The traditional dilemma of temperature measurement in HVAC pipelines

H3: Long distance attenuation: Traditional sensors have high internal resistance (>1k Ω), resulting in a 30% signal attenuation after 50 meters of transmission, leading to a deviation of ± 2 ℃ in water temperature monitoring (overheating/undercooling of underfloor heating);

H3: Pipeline vibration offset: The rigid sensor (welded and fixed) becomes loose under the impact of pipeline water flow, with a detachment rate of 15% per year, requiring frequent maintenance.

H2: Advantages of TCR3750 Thin Film Platinum Resistors in Pipeline Scenarios

Our HVAC pipeline temperature measurement film platinum resistance has an internal resistance of ≤ 100 Ω (pt100), and the signal attenuation during long-distance transmission of 100 meters is less than 5%. Coupled with shielded cables, the anti electromagnetic interference ability is improved by 80%, and the measured error is ± 0.3 ℃.

H3: Anti vibration fixation: using 304 stainless steel clamps and flexible rubber pads (to cushion vibration), passing 5G vibration testing (simulating pipeline water flow impact), with a 10-year detachment rate of<1%;

After the HVAC project of a commercial complex was put into use, the failure rate of pipeline temperature measurement decreased from 20 times per year to 0, and the operation and maintenance cost was saved by 800000 yuan per year. This is precisely the value of HVAC pipeline temperature measurement thin film platinum resistors.

Scenario: A 200000 square meter commercial building (with 120 chilled water pipes, each 80 meters long, requiring monitoring of supply and return water temperature)
Solution: Customized 6 × 3mm PT100 thin film platinum resistor (clamp fixed on the outer wall of the pipeline)+bus transmission (1 wire in series with 10 sensors)
Effect: Real time monitoring of temperature at 120 points (accuracy ± 0.3 ℃), system energy saving of 18%, awarded LEED green building certification bonus points.

H2: Selection Guide: Three Core Parameters of HVAC Pipeline Sensors

Internal resistance (≤ 100 Ω, reducing long-distance attenuation)
Protection level (IP68 waterproof, resistant to humid pipeline environment)
Installation method (clamp/adhesive optional, suitable for different pipe diameters)

Technical Specification for Temperature Monitoring of HVAC Systems (GB 50736-2012)
HVAC Renovation Report for a Commercial Complex (2024)
SGS Anti Vibration Test Certification (Report No. BJ-SGS-202409)

Making the temperature of HVAC pipelines visible and accurately measured is the key to building energy efficiency and comfort, as the use of thin film platinum resistors for temperature measurement in HVAC pipelines is crucial. Get the same plan through private message and apply for samples for free!

Author Information: Mr. Li | HVAC Sensor Technology Manager (12 years of experience in building energy management, leading the renovation of a 100000 square meter project)

FAQ (3 questions):

Q1: Can the sensor withstand the adhesion of scale inside the pipeline?
A: Surface treatment with hydrophobic coating (contact angle>110 °) reduces scale adhesion by 70% without affecting temperature measurement.
Q2: Does it support Modbus protocol docking with BA system?
A: Free protocol conversion module provided, plug and play, no need for secondary development.
Q3: Minimum order quantity?
A: Minimum order of 500 pieces, supports mixed batch (pt100/pt1000 combination).

Xi'an Tongzida Technology Co., Ltd. est un fabricant et fournisseur de premier plan de technologies de thermistances avancées, spécialisé dans la fourniture de capteurs de température haute performance pour les applications industrielles exigeantes. Notre expertise approfondie en matière de fabrication de microcapteurs, de technologies d'encapsulation spéciales et de méthodes d'intégration multi-capteurs nous permet de garantir l'excellente performance et la fiabilité de nos thermistances. En tant que fournisseur de confiance de solutions de mesure de température de précision, nous proposons un système complet de thermistances, incluant les puces sensibles, les systèmes de test et les logiciels d'analyse. N'hésitez pas à contacter nos experts techniques. ventes11@xatzd.com Discutez de vos besoins spécifiques en matière de thermistances et découvrez comment nos capacités avancées d'optimisation et de fabrication de résistances en température peuvent améliorer les performances et la fiabilité de votre système de mesure de température.