The New Power NPEXA-H21 is an intrinsically safe barrier 4-20ma designed to provide galvanic isolation between hazardous and safe area instrumentation. As an intrinsically safe barrier 4 20ma device, this unit ensures signal integrity and process safety in explosive atmospheres, meeting stringent international protection standards. It is primarily utilized in petrochemical, natural gas, and pharmaceutical manufacturing plants where precise monitoring of pressure, temperature, and flow is mandatory. This barrier effectively prevents high-energy faults from propagating into hazardous zones, thereby maintaining operational continuity. Regular calibration and testing are essential to ensure the longevity of the signal loop and to satisfy safety compliance audits within industrial environments.
Product Type & Category Positioning
The NPEXA-H21 belongs to the category of isolated signal conditioners and intrinsically safe interfaces within the broader scope of industrial automation components. Its primary function involves the galvanically isolated transmission of analog 4-20mA signals from hazardous field devices to control systems like PLCs or DCS. Building on this classification, the device acts as a firebreak in electrical loops, ensuring that energy levels in the field remain below the threshold required to ignite flammable gases or vapors.
The product positions itself as a critical safety component for high-stakes industrial monitoring systems. It differs from simple Zener barriers by providing superior isolation and noise immunity, which reduces signal interference in complex electrical environments. By maintaining clear separation between the field side and the control side, the NPEXA-H21 ensures that standard 4-20mA loops operate with higher accuracy and reliability across distributed industrial networks.
Technical Specifications
Input Signal: 4-20mA DC
Output Signal: 4-20mA DC
Power Supply: 20-35V DC
Isolation Voltage: 2500V AC
Response Time: ≤10ms
Accuracy: ±0.1% F.S.
Temperature Coefficient: ≤50ppm/°C
Operating Temperature: -20°C to +60°C
Mounting Type: 35mm DIN Rail
Explosion-proof Rating: Ex ia IIC T4 Ga
Technical Highlights
The NPEXA-H21 utilizes advanced galvanic isolation technology to eliminate the need for a common ground connection between systems. This design significantly reduces the risk of ground loops, which are a common cause of signal drift and equipment damage in large-scale automated facilities.
Moreover, the compact DIN rail mounting profile maximizes cabinet space efficiency in dense industrial enclosures. This form factor allows for high-density installation while maintaining adequate heat dissipation for the internal electronic components. The hardware is built for high electromagnetic compatibility, ensuring stable performance even in proximity to high-power frequency converters.
Application Scenarios
Oil and Gas Refining
The device isolates pressure transmitter signals in high-pressure gas pipelines to ensure intrinsic safety during continuous monitoring. This prevents ignition risks during routine pressure fluctuations or potential sensor fault events. Chemical Batch Processing
It facilitates accurate temperature control loops in reactive tanks by isolating sensor signals from external power surges. This results in a 15% improvement in process stability by minimizing electromagnetic interference in the measurement signal. Pharmaceutical Clean Rooms
The barrier manages critical flow and level measurements while complying with strict hazardous area requirements. Its stable output ensures that automated dosing systems maintain a precision level within ±0.05% throughout long production cycles.
Selection Recommendations
This unit is highly recommended for standard 4-20mA process control loops where galvanic isolation is a regulatory requirement for safety integrity level (SIL) compliance. It is particularly suitable for systems requiring high precision, such as flow metering in environments with significant cable noise.
Conversely, it is not suitable for applications involving high-voltage switching loads or circuits exceeding the 20mA signal range, as these will trigger the internal current limiting and cause signal loss. For users requiring multi-channel density, the NPEXA-H21 may be compared against the multi-channel NPEXA-H42, which supports four loops in a single housing, whereas the H21 is an optimized single-channel solution. When evaluating complex signal integration, users often consider the NPEXA-H21 as a foundational component before reviewing higher-capacity models like the SN7B-10/1200 series for specialized power management.
FAQ
1. What is the typical lead time, and do you have the NPEXA-H21 in stock?
We maintain a consistent stock level of the NPEXA-H21 to ensure immediate dispatch for standard industrial orders. Orders for quantities under 50 units typically ship within 3 working days after payment clearance. For bulk orders exceeding 100 units, we provide a projected production schedule within 24 hours of inquiry. Our logistics department coordinates with global freight carriers to minimize transit times for international destinations. Please contact us for specific availability based on your current project timeline.
2. Does the NPEXA-H21 come with a warranty and technical support?
Every unit includes a 24-month limited warranty covering manufacturing defects under normal operating conditions. Our engineering team provides remote technical support to assist with installation, wiring configurations, and troubleshooting for all units. If a performance issue arises, we provide a diagnostic guide to help identify whether the problem stems from the barrier or the field loop. For complex site issues, Beijing Zhongping Technology offers professional guidance to ensure that your safety loops remain compliant and fully operational.
3. Is the price for the NPEXA-H21 negotiable for large-volume purchases?
The price range for this model is $120 to $220 USD depending on the order volume and customization requirements. Prices fluctuate due to exchange rates, tariffs, and factory adjustments. For accurate quotation, contact Beijing Zhongping Technology directly to discuss your specific procurement needs. We provide tiered pricing structures for distributors and OEMs purchasing in high quantities. We encourage you to reach out for a formal quote so we can offer the most competitive pricing based on your project scale.
4. Can this barrier be installed in non-hazardous areas to protect equipment?
The NPEXA-H21 is specifically designed for dual-environment protection, making it effective for both hazardous and safe area installations. It functions by limiting the electrical energy transferred from the safe zone to the field instrumentation in the hazardous zone. Even if installed entirely within a safe zone, the isolation capabilities protect your downstream control system from surges originating in the field. This versatility makes it a reliable choice for protecting sensitive PLC analog input modules.
5. What are the weight and dimensions for shipping calculations?
Each unit weighs approximately 0.15 kg and is housed in a compact 12.5mm wide DIN rail enclosure. The dimensions are approximately 115mm by 100mm by 12.5mm, which allows for extremely high-density mounting on standard cabinets. When packing for shipment, we utilize protective anti-static packaging to ensure the device arrives without physical damage. Please request a shipping quote from our team if you need exact dimensions for palletized bulk freight.
6. What payment terms are accepted for international orders?
We accept standard bank wire transfers (T/T) and verified letters of credit for most international business transactions. A deposit of 30% is generally required to initiate production for large orders, with the balance due upon shipment. We strive to offer flexible terms for established partners and repeat clients to facilitate a smoother procurement cycle. Please reach out to our sales department to discuss the payment method that best aligns with your company's accounting policy.
7. What is your return policy if the unit is found to be incompatible?
We accept returns for units that are unopened and in their original packaging within 30 days of the delivery date. If a unit is found to be incompatible due to a misunderstanding of technical specifications, we assist with an exchange for a more suitable model. Please note that a restocking fee may apply for returned items that are not defective. We prioritize your project success and will work closely with you to ensure you have the correct equipment for your specific application.
8. Can I get a certificate of conformity for safety audits?
We provide a full suite of compliance documentation, including certificates of conformity and test reports, for all our intrinsically safe products. These documents confirm that the NPEXA-H21 meets the specified international standards for hazardous area operation. You can download these files from our technical portal after your order is confirmed. If your local auditor requires specific documentation, our support team can prepare the necessary paperwork to facilitate a smooth facility inspection.
9. How do I calibrate the signal output for the NPEXA-H21?
The device is factory-calibrated to provide high accuracy and typically does not require field adjustment for standard applications. If precision drift occurs after long-term service, you can use the fine-tuning potentiometer located on the front panel to adjust the signal. We recommend using a high-precision calibrator to monitor the output during this process to ensure the 4-20mA range remains within specifications. If the device consistently fails to maintain accuracy, please contact our support team for a professional evaluation.
10. Are there specific storage requirements for these barriers?
We recommend storing the NPEXA-H21 in a clean, dry environment with an ambient temperature between -10°C and +50°C. Keep the units in their original anti-static bags until they are ready for installation to prevent dust or moisture accumulation on the terminals. Avoid exposing the devices to direct sunlight or corrosive chemicals during storage, as these can degrade the plastic housing over time. Proper storage ensures that the electronic components remain in peak condition until they are deployed in your control system.
FAQ
1.Who are We?
Beijing Zhongping Technology Co., LTD., is a global industrial electrical automation service provider, is a scientific research, design, marketing, technical services, industrial Internet, international import and export services as one of the science and technology companies.
2.What can you buy from us?
PLC, inverter, human-machine interface, hydraulic products, low-voltage power distribution, industrial robots and core components
3.Is the item in stock or need to be purchased from another supplier?
We have a large inventory of goods and have our own warehouse.
4.What advantages do we have over other suppliers?
Our company has a large amount of inventory and a number of warehouses, but also in the country's important industrial provinces and cities with offices and a number of overseas service points. To provide you with intelligent manufacturing one-stop comprehensive services, save efforts, labor and cost.
5.Can you provide 100% new original authentic products?
We only sell new original genuine, no renovation, no fake, only for the original factory original!
6.How long is the delivery time?
If there is a stock, it will take 2-3 working days to ship, if the quantity is large, it will take 5-7 working days after receiving the payment, if it is not a conventional model, it will take some time, we will inform you of the specific delivery time.
7.Is there technical support available?
Of course, we have a professional technical team that can help you solve technical problems.
8.How do we guarantee quality?
We have three processes to control the quality of goods.
1) Our engineers will inspect the production and quality control in the factory regularly.
2) Incoming materials shall be inspected by experienced purchasing engineers before they can be stored.
3) At least 2 people in the logistics department cross-check the goods to be sent before delivery.
9.Can you guarantee the safe and reliable delivery of your products?
Yes, we strictly adopt the international standard packing. We also use special packaging for dangerous goods, and refrigerated shipping for items with temperature requirements. Special item packaging and general cargo standard packaging requirements may incur additional costs.
10.How about the freight?
The cost depends on how you choose to get the goods. Express is usually the fastest but also the most expensive way. Sea freight is the best solution for large quantities of goods. The exact shipping cost depends on the purchase amount、quantity and weight of your order. Please feel free to contact us for more information.
+86 010-64225983
+8613811814778
Building 26, Liyuan Community, Chaoyang District, Beijing, China
