Accurate temperature measurement in hazardous industrial environments such as chemical refineries, metallurgical plants, and power generation facilities often requires transmitting low-voltage thermocouple signals over long distances. These weak signals are frequently susceptible to ground loops, electromagnetic interference, and severe voltage surges that can corrupt process control data. Furthermore, intrinsic safety standards mandate strict galvanic isolation between hazardous area field instruments and safe area control systems to prevent ignition hazards in explosive atmospheres.
To address these critical engineering challenges, the NEWPWR NPEXA thermocouple signal conditioner and zener barrier series delivers robust three-port electrical isolation and precise external cold junction compensation. By effectively decoupling the measurement loop, this device eliminates common-mode noise and protects downstream distributed control systems from hazardous voltage spikes. The system ensures high-integrity signal conversion from raw thermocouple inputs into standardized 4~20 mA current loops, maintaining optimal measurement accuracy across wide ambient temperature ranges.
Technical Specifications
NPEXA-C11H: Power Supply 18 ~ 60 V DC @ Safe Area
NPEXA-C11H: Input Signal Thermocouple TC @ Hazardous Area
NPEXA-C11H: Output Signal 4 ~ 20 mA @ Safe Area
NPEXA-C11H: Allowable Load RL ≤ 550 Ω @ Maximum Output
NPEXA-C11H: Compensation Accuracy 1 ℃ @ -20 ℃ ~ +60 ℃
NPEXA-C11H: Response Time Ta ≤ 500 ms @ Step Input Change
NPEXA-C11H: Working Power Consumption 0.8 W @ 24 V DC
NPEXA-C11H: Electromagnetic Compatibility IEC 61326-3-1 @ Industrial Environment
NPEXA-C11H: Dielectric Strength ≥ 3000 V AC @ Intrinsic Safety Side to Safe Side
NPEXA-C11H: Dielectric Strength ≥ 1500 V AC @ Power Supply to Safe Side
NPEXA-C11H: Insulation Resistance ≥ 100 MΩ @ Input, Output, and Power Terminals
NPEXA-C11H: Operating Temperature -20 ℃ ~ +60 ℃ @ Ambient Conditions
NPEXA-C11H: Storage Temperature -40 ℃ ~ +80 ℃ @ Non-Operating
NPEXA-C11H: Application Area Safe Area Installation @ Zones 0, 1, 2 IIA, IIB, IIC T4 ~ T6
NPEXA-C11H: Output Status Default Following Mode @ Configurable NE43 or Fixed Output
NPEXA-C11H: Connection Type Screw Terminal @ Field Wiring
NPEXA-C11H: Dimensions Width 17.8 mm x Height 110.0 mm x Depth 117.0 mm @ DIN Rail
NPEXA-C11H: Mounting Type DIN 35 mm Rail Mounting @ Control Cabinet
NPEXA-C11H: Product Certifications CNEX, CE, FCC, CCC @ International Standards
NPEXA-C11H: Explosion-Proof Rating [Ex ia Ga] IIC @ Intrinsic Safety Classification
NPEXA-C11H: Maximum Voltage Um 250 V @ Non-Intrinsic Safety Side
NPEXA-C11H: Maximum Output Voltage Uo 8.7 V @ Terminals 1 and 2
NPEXA-C11H: Maximum Output Current Io 33 mA @ Terminals 1 and 2
NPEXA-C11H: Maximum Output Power Po 72 mW @ Terminals 1 and 2
NPEXA-C11H: Maximum External Capacitance Co 3.58 μF @ Terminals 1 and 2
NPEXA-C11H: Maximum External Inductance Lo 21 mH @ Terminals 1 and 2
Comprehensive Model Range & Key Specifications
The NEWPWR safety barrier lineup is divided into distinct architectural families to match diverse control cabinet layouts and loop power requirements. The C Series rail-mounted units and H Series backplane-mounted units provide scalable channel densities and flexible power configurations.
- C Series Terminal-Powered Models:
- NPEXA-C11H: C Series, Thermocouple TC Input, 4~20 mA Output, Single Channel Input with Single Channel Output, 24 V DC Terminal Powered.
- NPEXA-C111H: C Series, Thermocouple TC Input, 4~20 mA Output, Single Channel Input with Dual Channel Output, 24 V DC Terminal Powered.
- NPEXA-C1D11: C Series, Thermocouple TC Input, 4~20 mA Output, Dual Channel Input with Dual Channel Output, 24 V DC Terminal Powered.
- NPEXA-C11A2: C Series, Thermocouple TC Input, 4~20 mA Output plus Relay Alarm, Single Channel Input with Triple Channel Output, 24 V DC Terminal Powered with Dual Alarm Settings.
- C Series Loop-Powered Models:
- NPEXA-C11L: C Series, Thermocouple TC Input, 4~20 mA Output, Single Channel Input with Single Channel Output, Loop Powered without External Independent Supply.
- NPEXA-C1D11L: C Series, Thermocouple TC Input, 4~20 mA Output, Dual Channel Input with Dual Channel Output, Loop Powered without External Independent Supply.
- H Series Backplane-Mounted Models:
- NPEXA-H11: H Series Backplane Mounted, Thermocouple TC Input, 4~20 mA Output, Single Channel Input with Single Channel Output, Backplane Powered.
- NPEXA-H111: H Series Backplane Mounted, Thermocouple TC Input, 4~20 mA Output, Single Channel Input with Dual Channel Output, Backplane Powered.
- NPEXA-H171: H Series Backplane Mounted, Thermocouple TC Input, 4~20 mA and 1:1 mV Output, Single Channel Input with Dual Channel Output, Backplane Powered.
- NPEXA-H1D11: H Series Backplane Mounted, Thermocouple TC Input, 4~20 mA Output, Dual Channel Input with Dual Channel Output, Backplane Powered.
Multi-Angle Deep Dive
The flagship NPEXA-C11H model incorporates advanced microprocessors that handle cold junction compensation directly at the external terminal block. Users can easily configure thermocouple types and temperature measurement ranges using a standard PC configuration software tool or a hand-held programmer. This flexibility allows instrumentation engineers to adapt a single hardware part number to multiple temperature measurement loops across the plant.
Power architecture selection dictates the physical wiring scheme inside control cabinets. While the NPEXA-C11H requires an independent 24 V DC rail supply, loop-powered variants such as the NPEXA-C11L and NPEXA-C1D11L draw operating energy directly from the 4~20 mA output loop. Loop-powered units simplify wiring topologies and reduce power consumption in remote instrumentation panels. Meanwhile, the H Series backplane-mounted modules optimize space in high-density cabinets by eliminating individual power jumper wires.
Channel density and auxiliary output features offer distinct advantages for complex automation architectures. Standard single-channel units handle point-to-point isolation, whereas dual-channel configurations like the NPEXA-C1D11 consolidate two measurement loops into a single 17.8 mm enclosure housing. Specialized models such as the NPEXA-C11A2 provide integrated relay alarm outputs alongside the standard current transmission, enabling direct local trip logic before signals reach the main controller.
Reliability is further enhanced through built-in online self-diagnostic routines that continuously monitor internal circuit health and sensor connection status. If a thermocouple probe breaks, the unit drives the output to a predefined safe state according to NAMUR NE43 standards. High dielectric strength ratings ensure reliable operation under severe transient overvoltage conditions typical of heavy industrial environments.
Engineer's Selection & Pitfall Guide
When selecting thermocouple safety barriers, engineers frequently misjudge the power supply requirements between independent rail-powered units and loop-powered alternatives. Choosing a loop-powered device when the control system card cannot supply adequate loop voltage will cause signal clipping or loop collapse. Always calculate the maximum load resistance against the available terminal voltage before finalizing loop-powered model selections.
Another common oversight involves neglecting the terminal wiring topology of multi-channel and alarm-enabled variants. Models featuring dual channels or integrated relay contacts require precise pin-out verification to prevent cross-talk or improper grounding of the intrinsic safety shield. Field technicians must ensure that safe-area and hazardous-area wiring are strictly segregated through dedicated cable ducts.
Cabinet layout constraints often dictate whether to use DIN-rail mounted C Series modules or backplane-mounted H Series units. Installing high-density backplane systems requires compatible system racks and proper thermal management to dissipate cumulative internal heat loads within enclosed marshalling cabinets. Verifying explosion-proof certification classes against the specific zone classification of the hazardous area prevents compliance failures during safety audits.
Summary & Conclusion
The NEWPWR NPEXA thermocouple signal conditioner and zener barrier series delivers exceptional performance, robust galvanic isolation, and flexible configuration options for demanding industrial applications. Proper model selection ensures long-term measurement stability and rigorous protection against hazardous electrical transients. Technical support teams are available to assist with cross-reference matching and complete system integration.
Frequently Asked Questions (FAQ)
1. What is the standard stock availability and delivery lead time for these safety barriers?
Beijing Zhongping Technology maintains a comprehensive regional inventory of standard NEWPWR safety barrier models, ensuring rapid same-day processing and expedited shipping to minimize industrial downtime.
2. What warranty coverage and RMA procedures apply to purchased units?
All modules are backed by a comprehensive 12-month manufacturer warranty covering material and workmanship defects, supported by streamlined local testing and return merchandise authorization processing through Beijing Zhongping Technology.
3. What are the operating voltage range and power consumption specifications?
The standard NPEXA-C11H operates on a nominal DC power supply ranging from 18 V DC to 60 V DC with a typical working power consumption of 0.8 W.
4. How do these devices protect against electromagnetic interference and ground loops?
Complete three-port galvanic isolation prevents ground loop currents between the hazardous field side, safe control side, and power supply rails while complying with IEC 61326-3-1 standards.
5. What environmental temperature limits and IP ratings apply during operation?
The units operate reliably within an ambient temperature range of -20 ℃ to +60 ℃ and are designed for installation inside standard indoor control cabinets or protective enclosures.
6. What physical dimensions and mounting methods are supported?
Standard C Series modules feature a compact 17.8 mm width profile and snap directly onto standard DIN 35 mm mounting rails inside industrial control panels.
7. How are diagnostic errors and sensor break conditions handled by the system?
Integrated online self-diagnostic routines detect open thermocouple circuits and drive output signals to a predictable safe state conforming to NAMUR NE43 guidelines.
8. Can the temperature range and thermocouple types be reconfigured in the field?
Users can easily adjust thermocouple分度号 types and full-scale temperature ranges using a standard PC configuration interface or a compatible hand-held programmer.
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
