The New Power NPEXA-C91 serves as a high-precision intrinsically safe barrier, specifically engineered to isolate potentiometer signals in hazardous industrial environments. As an essential component for intrinsic safety barrier and intrinsically safe barrier applications, this model provides galvanic isolation between hazardous-area sensors and safe-area control systems. It effectively prevents electrical energy from reaching potentially explosive atmospheres, meeting strict safety standards for chemical, oil, and gas processing facilities. Engineers utilize the NPEXA-C91 to ensure signal integrity while maintaining operational compliance during routine maintenance or system upgrades.
Product Type & Category Positioning
The NPEXA-C91 is classified as an isolated analog input barrier designed specifically for position-sensing elements like potentiometers. It belongs to the broader category of signal conditioners that prioritize safety through energy limitation rather than standard signal conversion. This device isolates the loop, eliminating ground loops and preventing signal degradation in long-distance transmissions.
Building on this classification, the unit maintains system stability by providing a regulated excitation voltage to the potentiometer. Its primary function is to transform the potentiometer resistance signal into a standardized output for PLC or DCS integration. Unlike passive barriers, this active isolated unit requires an external power supply to maintain signal accuracy across various load conditions.
Technical Specifications
Input type: Potentiometer (0 to 10 kΩ)
Excitation voltage: 5 VDC
Signal output: 4 to 20 mA or 1 to 5 VDC
Accuracy: 0.1% F.S.
Response time: ≤ 10 ms
Isolation voltage: 2500 VAC
Operating temperature range: -20 °C to +60 °C
Storage temperature range: -40 °C to +80 °C
Power supply: 20 to 30 VDC
Mounting type: 35 mm DIN rail
Housing material: Flame-retardant polyamide
Protection rating: IP20
Weight: 150 g
Technical Highlights
The NPEXA-C91 features advanced galvanic isolation technology, ensuring that fault currents in the hazardous area cannot propagate to the control room equipment. This hardware-level protection is critical for maintaining process safety in volatile environments.
Moreover, the device incorporates high-precision signal processing circuits that minimize thermal drift, providing consistent output even in fluctuating ambient temperatures. The low response time of 10 ms enables real-time monitoring of rapid mechanical movements, supporting high-speed automation demands.
Additionally, the compact, thin-profile design optimizes cabinet space, allowing for high-density mounting in constrained control rooms. The plug-and-play wiring terminal block simplifies installation and reduces downtime during sensor replacement or scheduled maintenance cycles.
Application Scenarios
Chemical Reaction Monitoring: Tracks valve position or agitator blade angles in reactors, ensuring 99.9% signal reliability despite presence of flammable vapors. Petrochemical Tank Level Measurement: Interfaces with potentiometer-based liquid level sensors to provide precise depth data, reducing measurement errors to less than 0.1% of the full span. Pipeline Flow Control: Manages position feedback for actuators in hazardous areas, maintaining a consistent 4 to 20 mA signal output even during external electrical interference.
Selection Recommendations
Suitable Application: High-precision position feedback in Zone 1 hazardous areas (where signals are purely resistive, the resistance range is 0 to 10 kΩ, and the system requires galvanic isolation to prevent ground loop noise). Unsuitable Application: Extremely high-vibration environments exceeding 5G or locations where the ambient temperature exceeds 65 °C, as these conditions surpass the unit's mechanical and thermal tolerance specifications.
For projects requiring multi-channel signal processing or higher current output, consider the NPEXA-C92 or the NPEXA-D series. The NPEXA-C91 is designed for single-channel applications, whereas the NPEXA-D series offers dual-channel functionality to save on footprint when multiple potentiometers need protection.
FAQ
1. What is the current price range for the NPEXA-C91, and is volume pricing available?
The price for this unit ranges from $140 to $255 USD per piece. We offer tiered pricing for orders exceeding 10 units to support large-scale facility upgrades. Prices fluctuate due to exchange rates, tariffs, and factory adjustments. For an accurate, localized quotation including shipping, please contact Beijing Zhongping Technology directly.
2. What is the lead time for this product, and do you keep units in stock?
We maintain a rolling inventory of standard NPEXA-C91 units to ensure immediate availability for urgent requests. In-stock items are typically processed and dispatched within 2 business days after payment verification. For bulk orders exceeding 50 units, the lead time is approximately 10 to 15 working days. Beijing Zhongping Technology coordinates with international logistics partners to provide tracking numbers immediately upon dispatch.
3. How should I verify the compatibility of this barrier with my existing potentiometer?
Confirm that your potentiometer resistance falls within the 0 to 10 kΩ range supported by the input circuit. Ensure that the excitation voltage required by your sensor matches the 5 VDC output of the NPEXA-C91. Check the control system input impedance to ensure it remains within the standard 4 to 20 mA signal loop range. Contact our technical team if your sensor requires a different excitation voltage or resistance range.
4. Is there an installation manual or guide provided with the device?
Every unit includes a comprehensive technical manual detailing terminal assignments and wiring diagrams for both hazardous and safe areas. The guide provides step-by-step instructions for 35 mm DIN rail mounting and connection procedures. You will also find a troubleshooting section that details common LED indicator status codes. If you misplace your manual, our team can email a digital PDF version upon request.
5. Does the device meet international intrinsic safety standards?
Yes, the NPEXA-C91 is tested and certified to comply with IECEx and ATEX standards for explosion-proof equipment. It provides a safety barrier function by limiting electrical energy to safe levels under both normal and fault conditions. We provide copies of valid compliance certificates with each shipment for your project documentation. Ensure your local regulatory authority accepts these international standards before finalizing your purchase.
6. What are the available payment terms for new corporate clients?
We accept standard bank wire transfers (T/T) and verified letters of credit for international transactions. For initial orders, we typically require 100% payment before the shipment is released from our warehouse. Established partners may apply for net-30 day payment terms after completing a credit review process. Please contact our finance department to receive our official banking details and account instructions.
7. What is your policy regarding product returns or warranty claims?
We provide a 12-month standard warranty covering defects in material and workmanship. If a unit fails, please submit the serial number and a brief description of the error to our technical support team. We will issue a return authorization number if the fault is confirmed as a manufacturing issue. Once we receive the returned unit, we will dispatch a replacement within 5 working days.
8. Can this barrier be used in outdoor environments without an enclosure?
The NPEXA-C91 features an IP20-rated housing and is not designed for direct exposure to environmental elements like rain, dust, or humidity. It must be installed within a secondary junction box or a protected control panel cabinet that meets at least IP54 standards. If the installation environment is particularly harsh, we recommend using a stainless steel NEMA 4X rated enclosure. Always consult your local site safety inspector regarding cabinet environmental requirements.
9. Do you offer technical support for onsite installation and configuration?
We provide remote technical support via email, phone, and video conferencing to assist your engineering team with setup. Our experts can review your wiring schematics to ensure proper loop configuration before you energize the system. While we do not typically dispatch personnel for onsite installation, we provide detailed diagnostic guides for field commissioning. Contact our engineering support desk to schedule a technical consultation.
10. What shipping methods are available for international deliveries?
We utilize reliable air freight carriers such as DHL, FedEx, and UPS for standard international shipments to ensure timely arrival. For larger orders, we offer sea freight options to reduce transport costs for your project. All shipments are securely packaged to prevent vibration damage during transit. We provide a full set of customs documentation, including a commercial invoice and certificate of origin, to facilitate smooth port clearance.
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
