BWY-804J-12 Oil surface temperature controller BWR-04J-8 Winding thermometer Oil change temperature control manufacturer

option BWY,BWR Series of thermostat manufacturers, need to focus on technical strength, product quality, market reputation, after-sales service and price-performance ratio and other core dimensions of a comprehensive assessment, combined with the technical characteristics of specific models and application scenarios accurate screening. The following is a detailed analysis from the multi-dimensional development, into the mainstream models of technical parameters and performance characteristics:

The technical strength of the manufacturer directly determines the adaptability and reliability of the product, you need to focus on its R & D model coverage, the application of core technologies and parameter control accuracy. High-quality manufacturers can usually provide a rich matrix of models to meet the needs of different scenarios of temperature measurement, and the core technical indicators in strict compliance with industry standards.

In the BWY series of oil level thermostats, the mainstream models coverbwy-802, bwy-803, bwy-806jjand other basic models and various derivative models. Among themBWY-802/803As a classic model, the series adopts the sealed sensing structure of "multi-turn spring tube + capillary tube + temperature sensing package", the built-in temperature sensing medium generates volume increment with the temperature change, and realizes the temperature indication and switching control through mechanical transmission, and the measuring range can be customized according to the demand as - 20~80℃, 0~100℃, 0~120℃ or 0~150℃, and the indication accuracy is up to 1.5 levels, which can meet the demand of oil temperature monitoring for transformers over 1000kVA. The measuring range can be customized to - 20~80℃, 0~100℃, 0~120℃ or 0~150℃, and the indication accuracy is up to 1.5 levels, which can meet the oil temperature monitoring requirements of transformers above 1000kVA. Derivative Modelsbwy-802a (th), bwy-803a (th) Increased composite sensing technology, synchronized output Pt100 platinum resistance signal on the basis of mechanical indication, can be transmitted to the control room hundreds of meters away, suitable for 8000kVA transformers and unmanned substations, and can withstand hot and humid environment, protection performance in line with GB/T2433.3-93 standards.

For higher precision requirements.BWY-806JJAs an upgraded model, the series is equipped with four or six groups of large-capacity temperature control switches, which support free setting of the full range and extend the measuring range to 0~150℃, with an accuracy level of 2.0, the contact action error is controlled at ±4℃, and the switching difference is 6±2℃. A (TH) type outputs one way Pt100 signal, AA (TH) type outputs two ways Pt100 signal, J (TH) type outputs 4~20mA current signal, and AJ (TH) type has the ability to output two kinds of signals at the same time, and the mounting size is compatible with the specifications of three-hole 144×210 or four-hole 100×80, which is suitable for the mounting requirements of different transformers.

BWR series winding thermostats are characterized bybwr-04, bwr-06, bwr2-04jtAs a representative, it adopts the principle of additional temperature rise, obtaining the load current through the current transformer, which is converted into additional displacement by the electric heating element, realizing the superposition measurement of the top oil temperature and the temperature rise of the winding.BWR-06Measuring range 0~150℃, accuracy level 2.0, protection level IP55, contact capacity up to AC220V/5A or DC27V/10A, of which BWR-06A type output 30~800Ω resistance signal, BWR-06J type by the meter head direct power output 4~20mA signal, suitable for large transformer winding temperature monitoring.BWR2-04JTThe model adopts supportive mounting, with an external dimension of 220×160mm, an optional opening size of 144×210 or 80×100mm, an operating voltage of 220V, an output of 4~20mA standard signal, and a weight of 3kg, which combines the advantages of installation flexibility and signal standardization.

In addition, the technical specifications of the manufacturer is crucial, you need to confirm whether the product is in line with JB/T6302-2016 "transformer oil surface temperature controller", JB/T9236-1999 "industrial automation instrumentation product modeling principles," and other standards, the core components such as Pt100 platinum resistance at 80 ℃, the standard resistance value should reach 130.89Ω, the 4 ~ 20mA signal in the range of 0 ~ 120 ℃ measurement of the corresponding output should be consistent with the linear relationship (eg, 80 ℃ is about 14.67mA), to ensure the accuracy and compatibility of signal transmission. The corresponding output of 4~20mA signal in the measurement range of 0~120℃ should be in line with the linear relationship (e.g. about 14.67mA at 80℃) to ensure the accuracy and compatibility of signal transmission.

Product quality is the basis for the stable operation of the thermostat, need to be verified from the production process, raw material control, quality certification and measured performance and other aspects of the layers, combined with the details of the specific model configuration to determine the reliability.

Production process, high-quality manufacturers have strict control over the processing accuracy of the core components, such as temperature sensing package Φ14 × 150mm stainless steel, wall thickness uniform and corrosion-resistant, mounting threads uniform M27 × 2 specifications, to ensure that the sealing of the transformer shell with the adaptive; capillary aging-resistant materials, the length of which can be customized according to the needs of the - 40 ~ 55 ℃ environment is still able to maintain the stability of the signal transmission. For the signal output module, such as 4~20mA transmitter needs to be calibrated linearly to ensure that the error in the full measurement range does not exceed ±0.5%, Pt100 RTD lead resistance difference needs to be ≤0.1Ω, to avoid signal attenuation affecting the measurement accuracy.

The quality of raw materials, should pay attention to the stability of the temperature-sensitive medium -- high-quality medium in the - 60 ~ 120 ℃ range of volume changes in high linearity, no delamination or solidification phenomenon; elastic components using fatigue-resistant alloy material, to ensure that tens of thousands of times after the action is still able to maintain the accuracy of the setting, the switch contact selection of silver alloy material, reduce the risk of arc ablation The switch contacts are made of silver alloy to reduce the risk of arc ablation and prolong the service life. Quality certification system, through the ISO9001 quality management system certification of the manufacturer is more reliable, its products need to go through the constant temperature bath test (such as 80 ℃ constant temperature after 15min, the indication value and the standard value deviation ≤ 1.5%), hot and humid test (relative humidity of 95% environment continuous operation of 72h without failure), vibration test and so on multiple testing to ensure that the long-term stability of the outdoor, hot and humid belt in harsh environments. ensure the long-term stability in outdoor, humid and hot zone and other harsh environments.

In view of the quality difference of different models, it is necessary to focus on verifying the detailed parameters: for example, the standard setpoints of the three switches of BWY-803 series are K1=55℃, K2=65℃, K3=80℃, and the setting accuracy is ±3℃, while the contact action error of BWY-806JJ series is more stringent, and it is controlled within ±4℃; the power supply suitability of BWR series needs to be additionally verified because it involves the conversion of currents. -- For example, if BWR-06 model needs to be powered by secondary instrument, and BWR-06J model comes with its own power supply, the manufacturer needs to provide clear wiring specifications and compatibility instructions to avoid power conflicts or signal interference problems.

Market reputation is an indirect reflection of the comprehensive strength of the manufacturer, you need to determine the reliability of the model through the market coverage, user feedback and long-term operational data, especially focusing on the performance of high-load scenarios.

The core models of high-quality manufacturers usually have a wide range of application cases, for example, BWY-803A (TH) model is often used in substations in rainy areas in the south due to its Pt100 signal output and humid and hot zone protection; BWR-06J model is widely adapted to the SCADA system by virtue of the standardized output of 4~20mA signals, which makes it the preferred model for unattended substations. Feedback from users can be collected through industry forums, technical exchange groups and other channels, focusing on "long-term operational stability" - such as whether there is indication drift when the temperature sensing package is inserted into the oil surface at a depth of ≥150mm; whether the contact point of the switch drifts in case of frequent operation (e.g., more than 10 starts and stops per day). Whether there is any sticking or poor contact in the contact point under frequent operation of the switch (e.g. more than 10 times a day); whether the signal transmission remains linear at a distance of several hundred meters and other key issues.

In addition, a manufacturer's ability to iterate its models also reflects market acceptance. If a manufacturer can continue to launch upgraded models (e.g., from BWY-802 to BWY-806JJ, adding multiple switches and signal output options), and the old model can still provide a stable supply of spare parts (e.g., microswitches, capillaries and other wear parts of the BWY-802), it means that it has a timely response to the market demand, and the after-sales service system is perfect. On the contrary, if a model is frequently launched after the parameters do not meet the standards, poor compatibility and other issues, or manufacturers can not provide historical operating data, then you need to be careful in the choice.

The installation and commissioning of the thermostat and later maintenance rely on professional after-sales service, manufacturers need to be able to provide personalized support for specific models to ensure smooth operation throughout the life cycle.

Response speed, high-quality manufacturers should be committed to 24 hours of technical advice, within 48 hours on-site service (remote areas can be extended appropriately), especially for fault repair scenarios -- such as the BWR series due to the associated winding temperature protection, if there is a signal interruption may lead to transformer tripping, manufacturers need to be able to quickly determine the point of failure (such as current) The manufacturer must be able to quickly determine the point of failure (e.g. faulty current transformer, damaged heating element, etc.) and provide replacement parts. Technical support needs to be model-specific: for example, when installing BWY-806JJ, the manufacturer needs to guide the user to select the number of switch groups (4 or 6) according to the capacity of the transformer; when connecting the wires, it is necessary to clearly differentiate between the Pt100 cables and the switch cables, to avoid confusion leading to short-circuiting of the signals; when debugging, it is necessary to use the standard thermostat tank calibration, to ensure that the indication value at 80℃ deviates ≤2℃ with the remote temperature display instrument.

Long-term service capability is equally important, manufacturers need to provide a full model of maintenance manuals, specify the calibration cycle of different models (such as general models calibrated every 12 months, high load scenarios calibrated every 6 months), calibration methods (such as the use of Allen wrenches to adjust the zero position of the pointer) and replacement cycle of wearing parts (such as capillary tube service life is usually 5 ~ 8 years). For old models (such as BWY-802 without Pt100 output), manufacturers need to be able to provide upgrading solutions (such as the addition of a temperature converter TC420, the resistance signal to 4 ~ 20mA output), to help users realize the compatibility of the equipment and functionality expansion, to avoid the elimination of models resulting in an increase in the cost of the overall replacement.

Price needs to match the model performance, quality and service, not simply the pursuit of low prices, should be combined with the unit cost of functionality to comprehensively assess the cost-effective. For example, BWY-803A (TH) type because of the composite sensing and humidity and heat with protection, the price is usually higher than the basic model BWY-803 type, but compared with the ordinary thermostat + humidity protection alone, its integrated design can reduce the overall procurement and installation costs; BWR-06J type although the price is higher than the BWR-06 type, but comes with the power supply module, which saves the purchase of the secondary instrumentation. Although the price of BWR-06J is higher than that of BWR-06, it comes with power supply module, which can save the purchase cost of secondary instrument and is more economical in the long run.

Comparison of prices need to be refined to the specific configuration: the same BWY-806JJ series, AA (TH) type due to the output of two Pt100 signal, the price should be higher than the A (TH) type, if a manufacturer's offer instead of lower, it is necessary to verify whether to reduce the cost of raw materials (eg, the use of low-quality platinum resistors, thin-walled temperature sensing packages); for the BWR series, it is necessary to confirm that the offer includes a matching current transformer, For the BWR series, it is necessary to confirm whether the offer includes the matching current transformer, wiring terminals and other accessories, to avoid the later appearance of the "low-priced machine, high-priced parts" situation. At the same time, the cost of after-sales service should be taken into account - if the calibration costs and spare parts of the low-priced products are too high, or the warranty period is too short (e.g., only 6 months), it may increase the cost of long-term use.

Conditions permit, it is recommended to visit the manufacturer's production base, focusing on the core links related to the production of models: in the R & D workshop, to see if there is a new model (eg, BWY-806JJ, BWR-06 upgrade models) test equipment (such as high and low temperature chamber, signal simulation platform); in the production workshop, observe the degree of automation of the process of sensing package welding, capillary tube encapsulation, and so on, high-quality manufacturers Quality manufacturers usually adopt mechanical automation welding to ensure sealing performance and avoid leakage problems caused by manual operation; in the quality control workshop, verify whether there is a factory inspection record for each product, including model, serial number, key parameters (such as Pt100 resistance value at 80 ℃, switching temperature), inspectors and other information, and the record should be traceable to the production batch.

In addition, the performance of the sample can be tested on the spot: select a typical model (e.g. BWY-803A, BWR-06J), set it at 80℃ in a standard constant temperature bath, observe the deviation of the pointer indication value from the standard value, and at the same time, test the signal output - the Pt100 signal should be in accordance with the standard of 130.89 Ω, and the 4-20mA signal should be stabilized at about 14.67mA. The 4-20mA signal should be stabilized at about 14.67mA, and the switch contact should be operated accurately within ±3℃ of the set temperature. If the on-site test data meets the standard and the production process is standardized, the reliability of the manufacturer's products is more guaranteed.

In summary, when choosing BWY, BWR thermostat manufacturers, you need to take the technical parameters of the model as the core, combined with the production process, market reputation, after-sales service and price-performance ratio to make a comprehensive judgment. It is recommended to give priority to manufacturers with complete models, transparent parameters, perfect certification system and can provide personalized technical support, if necessary, through sample testing and field visits to further verify to ensure that the selected product meets the needs of long-term stable operation.

If you have specific application scenarios (such as transformer capacity, installation environment, the type of signal required, etc.), you can further explain, I can recommend a more suitable model and screening focus; can also provide information on manufacturers that have been preliminarily screened, to help you analyze the degree of match between their product parameters and services.