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Analog Devices Inc. 7B27-K-21-1
- Part No.:
- 7B27-K-21-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor, Transducer Amplifiers
- Package:
- Datasheet:
-
7B27-K-21-1.pdf
- Description:
- MODULE ISOL THERMO-IN NON-LIN
- Quantity:
- Payment:
- Shipping:
Inventory:2,468
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Product details
Overview
7B27-K-21-1 from Analog Devices is a single-channel isolated thermocouple input signal conditioner for Type K thermocouples, providing factory-configured +1 V to +5 V output, ±0.01% initial accuracy, 3 Hz bandwidth, and 100 Vrms input-to-output isolation. It performs cold junction compensation, open-circuit detection, and low-drift amplification for industrial temperature monitoring in process control systems.
For engineers reviewing the 7B27-K-21-1 datasheet, 7B27-K-21-1 pinout, 7B27-K-21-1 application, or 7B27-K-21-1 equivalent, key selection criteria include its specified 0°C to +600°C input range, thermocouple-type-specific linearization, isolated voltage output compliance with 2 kΩ minimum load, and compatibility with 7B Series backplanes (AC1363) requiring +24 VDC nominal supply.
Technical Context
The 7B27-K-21-1 implements transformer-based isolation (100 Vrms continuous) with internal DC/DC conversion for front-end power, and uses amplitude modulation/demodulation for signal transfer. Its analog signal path includes a one-pole 3 Hz input filter, low-drift amplifier, thermistor-based cold junction compensation referenced to the backplane's CJC sensor, and a two-pole output low-pass filter (-3 dB @ 3 Hz).
It delivers <1 Ω output impedance, supports ±30 VDC input protection, and achieves ±0.5 µV/°C input offset drift and ±35 ppm/°C span drift over -40°C to +85°C. The module requires no external calibration and relies on factory-trimmed precision references and fixed-gain architecture for guaranteed ±0.1% maximum accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Type | Type K thermocouple only, with linearized response across 0°C to +600°C |
| Output Range | +1 V to +5 V, factory-configured, compatible with standard PLC analog inputs |
| Accuracy | ±0.01% span at +25°C; ±0.1% max including hysteresis and repeatability |
| Bandwidth | 3 Hz (-3 dB), enabling stable measurement of slow thermal processes without aliasing |
| Isolation Rating | 100 Vrms continuous input-to-output common-mode voltage isolation |
| Cold Junction Comp. | ±1.0°C max error over +5°C to +45°C ambient, using backplane-integrated thermistor |
| Input Protection | ±30 VDC continuous on input pins; meets ANSI/IEEE C37.90.1 and IEC 255-4 Class II |
Pinout & Package
7B27-K-21-1 uses the universal 6-pin plug-in format for 7B Series backplanes (e.g., AC1363), with gold-plated socket interface and screw-terminal field wiring. Dimensions: 42.24 mm × 53.6 mm × 14.3 mm (1.663″ × 2.11″ × 0.563″).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 0 | SENSOR INPUT | Direct connection point for thermocouple wires; referenced to Pin 1/2; not electrically isolated from input circuitry |
| 1 | INPUT HIGH | Positive thermocouple lead terminal; protected to ±30 VDC; part of differential input pair with Pin 2 |
| 2 | INPUT LOW | Negative thermocouple lead terminal; completes differential input path; shares common-mode reference with Pin 1 |
| 3 | POWER SUPPLY (DC) | +14 VDC to +35 VDC input; powers internal DC/DC converter and isolated front-end circuitry |
| 4 | OUTPUT VOLTAGE | +1 V to +5 V isolated analog output; low-impedance (<1 Ω); drives loads ≥2 kΩ |
| 5 | OUTPUT & POWER COMMON | Reference return for output voltage and power supply; galvanically isolated from input side |
Key Features
| Feature | Design Value |
|---|---|
| Thermocouple-Specific Linearization | Factory-calibrated for Type K across 0°C–+600°C, eliminating need for host-side polynomial correction |
| Upscale Open-Circuit Detection | Current-source-driven output saturation above +5 V indicates broken thermocouple wire |
| Backplane-Referenced CJC | Uses thermistor embedded under backplane terminal block-no separate CJC sensor required |
| Hot-Swappable Architecture | Insertable/removable under full power without disrupting field wiring or adjacent modules |
| Mix-and-Match Compatibility | Interoperates with all 7B Series input/output modules on same AC1363 backplane |
Applications
| Industrial Process Temperature Monitoring | Furnace & Kiln Control |
|---|---|
|
Use Scenario: Continuous temperature measurement in chemical reactor vessels using Type K thermocouples exposed to corrosive vapors and EMI-rich environments. IC Role / Device Role / Timing Role: Isolated signal conditioner converting raw thermocouple mV into noise-immune +1 V to +5 V analog signal for PLC acquisition. Use Value: 100 Vrms isolation and 160 dB CMR at 50/60 Hz reject ground-loop interference from motor drives and heaters. |
Use Scenario: Zone-wise temperature regulation in ceramic kilns where thermocouples operate up to +600°C and require long cable runs. IC Role / Device Role / Timing Role: Single-channel analog front-end providing linearized, cold-junction-compensated voltage output per zone. Use Value: Factory-trimmed ±0.01% accuracy and ±35 ppm/°C span drift ensure consistent setpoint tracking across thermal cycles. |
| Boiler Safety Interlocks | Food Processing Ovens |
|
Use Scenario: Redundant temperature sensing in steam boiler drum level control systems requiring fail-safe open-circuit detection. IC Role / Device Role / Timing Role: Isolated input module delivering upscale fault indication (>+5 V) upon thermocouple breakage. Use Value: Integrated current-source open-circuit detection eliminates need for external supervision circuitry. |
Use Scenario: Batch oven temperature profiling in meat processing lines, where hygiene mandates frequent washdowns and cable movement. IC Role / Device Role / Timing Role: Ruggedized signal conditioner with ±30 VDC input protection and IP-rated backplane mounting. Use Value: Input transient protection per IEC 255-4 Class II prevents damage during wet-environment maintenance events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermocouple signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADAM-4018-BE (Advantech) | 8-channel, Ethernet-connected, software-configurable range; no factory-set thermocouple type; lower isolation (1500 Vp) | Used in distributed SCADA networks rather than rack-mounted local I/O; requires configuration via utility | Choose when network integration and multi-channel consolidation outweigh need for fixed Type K optimization and hot-swap simplicity |
| OMEGA iDRN-TC (Omega Engineering) | Single-channel, DIN-rail mount; 0–10 V output only; ±0.1% accuracy; no open-circuit detection | Deployed in retrofit panel installations with space constraints; lacks backplane ecosystem | Choose for cost-sensitive standalone deployments where backplane modularity and fault signaling are noncritical |
Compared with ADAM-4018-BE and OMEGA iDRN-TC, the 7B27-K-21-1 provides deterministic Type K linearization, integrated open-circuit alerting, and seamless hot-swap operation within a standardized 19-inch rack system-making it optimal for high-reliability, serviceable industrial control cabinets.
Availability
7B27-K-21-1 is available at Aetrix Electronics and suitable for industrial process temperature monitoring, furnace control, boiler safety interlocks, and food processing ovens requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 7B27-K-21-1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and industrial systems.
The 7B Series was designed specifically for rugged, modular signal conditioning in factory-floor and process control environments-emphasizing channel-to-channel isolation, hot-swap reliability, and extended temperature operation from -40°C to +85°C.
FAQ
What thermocouple types does the 7B27-K-21-1 support?
The 7B27-K-21-1 supports Type K thermocouples exclusively, with factory calibration optimized for the 0°C to +600°C range. It does not support J, T, E, R, S, or B types-those require distinct model variants (e.g., 7B27-J-11-1 or 7B27-R-05-2). Each 7B27 variant is hard-coded for its designated thermocouple type and temperature span.
Does the 7B27-K-21-1 require external cold junction compensation?
No, the 7B27-K-21-1 uses internal cold junction compensation referenced to a thermistor embedded in the 7B Series backplane (e.g., AC1363), achieving ±1.0°C accuracy over +5°C to +45°C ambient. No external sensor, wiring, or host software compensation is needed-the 7B27-K-21-1 performs full linearization autonomously.
Can the 7B27-K-21-1 be used with a 12 VDC supply?
No, the 7B27-K-21-1 requires a minimum +14 VDC supply and operates up to +35 VDC. A 12 VDC source falls below specification and will prevent proper DC/DC converter operation, resulting in failure to power the isolated front-end circuitry or meet accuracy and isolation ratings.
What is the meaning of "upscale open-circuit indication" in the 7B27-K-21-1?
"Upscale open-circuit indication" means the 7B27-K-21-1 drives its +1 V to +5 V output above +5 V (typically to ~+6 V) when the thermocouple loop is broken. This is implemented via an internal current source and provides immediate, hardware-level fault detection without requiring host firmware polling or external comparators.
Is the 7B27-K-21-1 compatible with non-Analog Devices 7B Series backplanes?
The 7B27-K-21-1 is mechanically and electrically compatible only with official Analog Devices 7B Series backplanes (e.g., AC1363) due to precise pin alignment, gold-plated socket tolerances, and backplane-integrated CJC thermistor placement. Third-party or custom backplanes lack the required CJC reference and may compromise accuracy, isolation, or hot-swap reliability.
7B27-K-21-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- -
- Voltage - Supply:
- -
- Output Type:
- -
- Current - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
7B27-K-21-1 FAQ
1.How can I place an order for 7B27-K-21-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7B27-K-21-1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 7B27-K-21-1 reliable?
The price and inventory of 7B27-K-21-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7B27-K-21-1 is usually 5 days.
3.What payment methods are accepted for 7B27-K-21-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7B27-K-21-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7B27-K-21-1?
7B27-K-21-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7B27-K-21-1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 7B27-K-21-1?
For technical support, including 7B27-K-21-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7B27-K-21-1 requirements.
6.How does Aetrix verify that 7B27-K-21-1 is sourced from the original manufacturer or authorized distributors?
All 7B27-K-21-1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 7B27-K-21-1 meets industry standards.
7.What is the process for return or replacement of 7B27-K-21-1?
All 7B27-K-21-1 units undergo pre-shipment inspection (PSI). If there is an issue with 7B27-K-21-1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 7B27-K-21-1 part is unused and in its original packaging.
Return procedure for 7B27-K-21-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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