Description
The FNIRSI SG-004A Multifunctional Signal Generator is a next-generation, high-precision calibration instrument engineered to deliver exceptional accuracy, versatility, and performance in one compact device. Designed for engineers, field technicians, and laboratory professionals, it combines current, voltage, resistance, and thermocouple simulation functions into a single, intelligent platform. This all-in-one solution simplifies complex calibration workflows, making it an indispensable tool for industrial process control, instrumentation testing, and electronics diagnostics.
Built to meet the rigorous demands of modern engineering environments, the SG-004A merges cutting-edge technology with an intuitive design, allowing users to generate and measure signals with outstanding stability and precision. Whether used in a factory automation system, laboratory calibration setup, or field maintenance application, this device guarantees consistent, reliable performance — every time.
Comprehensive Multifunction Capabilities
The FNIRSI SG-004A is much more than a standard signal generator — it is a multifunctional calibration powerhouse capable of simulating and generating various signals essential to instrumentation and control systems. It integrates the following advanced functions into one portable unit:
1. Current Simulation (4–20 mA Loop)
The SG-004A supports 4–20 mA current output and loop simulation, the most widely used standard in industrial process control. This allows technicians to test and verify the performance of transmitters, sensors, and controllers used in pressure, temperature, and flow measurement systems.
The current output is extremely stable, with minimal drift and noise, ensuring accurate simulation of analog current loops during calibration or diagnostics. This is vital for ensuring process accuracy and safety in automation systems.
2. Precision Voltage Output and Measurement
The voltage output function provides precise DC voltage signals, ideal for calibrating analog input/output modules, PLCs, and measurement instruments. The voltage range and resolution are optimized for fine-tuning and verifying device performance under real working conditions.
In measurement mode, the SG-004A can read voltage levels with exceptional accuracy, allowing for direct comparison between simulated and measured values — a key feature for control engineers and maintenance teams.
3. Resistance Simulation
With its resistance simulation mode, the SG-004A can emulate resistive sensors or devices such as RTDs (Resistance Temperature Detectors). This is particularly useful for testing input modules and temperature control systems that rely on resistance-based feedback.
The precision resistance output ensures consistent calibration results, reducing error margins in instrumentation verification.
4. Thermocouple Simulation
The SG-004A’s thermocouple simulation capability is one of its most advanced features. Supporting multiple thermocouple types — K, J, E, T, R, S, and B — it can simulate a wide range of temperature signals for temperature controllers, transmitters, and indicators.
Each thermocouple type corresponds to specific industrial applications, allowing users to perform precise temperature calibration across diverse sectors such as manufacturing, HVAC, energy, and laboratory research.
By integrating these essential functions, the SG-004A eliminates the need for multiple standalone instruments, saving time, space, and cost while enhancing workflow efficiency.
Unmatched Precision and Signal Stability
Accuracy and consistency are the cornerstones of professional calibration, and the FNIRSI SG-004A is built to deliver both. Its high-quality reference circuitry and low-noise signal generation technology ensure that all outputs — current, voltage, resistance, and thermocouple — are stable, accurate, and repeatable.
The 4–20 mA loop output provides rock-solid performance, making it ideal for process verification and troubleshooting. Voltage and resistance outputs maintain tight tolerance levels, ensuring calibration reliability over extended use. Even in thermocouple simulation mode, the SG-004A reproduces voltage signals that accurately represent temperature values across wide ranges.
Thanks to its advanced internal signal processing, users can trust the SG-004A to maintain high precision in various environments — from air-conditioned labs to on-site industrial facilities.
Clear, Intelligent, and User-Friendly Interface
The 2.4-inch full-color TFT display on the SG-004A offers crisp, vibrant visuals, allowing users to monitor all parameters at a glance. The interface displays current, voltage, resistance, and thermocouple outputs simultaneously in real time, reducing guesswork and speeding up calibration workflows.
Its intuitive menu system and well-organized soft-key controls make it easy to navigate between functions, even for first-time users. Every feature is labeled clearly, ensuring quick setup and error-free operation. Whether in a brightly lit factory or a dimly lit field site, the display remains sharp and easy to read, minimizing eye strain and improving efficiency.
This smart interface design allows both experienced engineers and beginners to perform precise calibration with confidence and ease.
Compact, Durable, and Field-Ready Design
The FNIRSI SG-004A is engineered for portability and durability. Weighing light and compact in form, it fits comfortably into any technician’s toolkit, making it perfect for on-site calibration, field maintenance, or laboratory use.
The outer housing is made from robust, industrial-grade materials that provide excellent protection against wear, vibration, and environmental stress. Its compact layout ensures all controls are within easy reach, allowing smooth single-hand operation when needed.
Powered by an EU plug adapter with low power consumption, the device is efficient and long-lasting, capable of sustained operation during extended testing sessions. Whether you’re working in a manufacturing plant, power facility, or remote research site, the SG-004A delivers reliability and performance without compromise.
Advanced Thermocouple Simulation for Temperature Calibration
Thermocouples are among the most common temperature sensors in industrial systems, and the SG-004A provides full compatibility across major thermocouple types — K, J, E, T, R, S, and B.
This versatility allows the user to simulate temperature outputs corresponding to each thermocouple type’s voltage range. For instance:
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Type K: General-purpose use with a wide temperature range.
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Type J: Ideal for older equipment or lower temperature applications.
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Type E and T: Suitable for low-temperature environments.
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Types R, S, and B: Used in high-temperature and industrial furnace applications.
This simulation accuracy ensures the precise calibration of transmitters, indicators, and controllers, making it a valuable asset for temperature process control systems in industries like food processing, chemical plants, metallurgy, and environmental testing.
Built for Industrial Reliability and Professional Use
The SG-004A is not just a laboratory tool — it’s built for industrial-grade performance. Its precision and durability make it suitable for high-demand sectors such as automation, oil and gas, power generation, manufacturing, and R&D.
Whether verifying pressure transmitters, calibrating flow sensors, or validating control modules, the SG-004A provides consistent, repeatable results. Its high output stability ensures test results remain dependable even under temperature changes or electrical noise, maintaining calibration integrity in any environment.
For engineers tasked with commissioning, system verification, or instrument calibration, the SG-004A offers the reliability and precision essential for mission-critical operations.
Safety, Protection, and Reliability
FNIRSI prioritizes user safety and instrument protection. The SG-004A is equipped with multiple built-in safety mechanisms, including:
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Over-voltage Protection: Prevents output signal surges from damaging internal circuits.
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Overload and Short Circuit Protection: Shields both the device and connected equipment from excessive current or short faults.
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Overheat Protection: Monitors internal temperature to prevent overheating during prolonged use.
In addition, its solid-state construction ensures noise-free, interference-resistant signal generation, allowing users to achieve clean and accurate measurements under all conditions.
These features not only extend the instrument’s lifespan but also guarantee consistent performance and safety in professional environments.
Ease of Operation for Every Skill Level
While the FNIRSI SG-004A delivers professional-grade performance, its user interface is designed for simplicity. Engineers, technicians, and even beginners can quickly navigate functions and perform calibrations without complex configurations.
Each mode — whether for current, voltage, resistance, or thermocouple simulation — is accessible through intuitive menu selections. The responsive display provides instant feedback, helping users adjust parameters and observe real-time changes instantly.
This design philosophy bridges the gap between advanced engineering capability and user-friendly operation, making the SG-004A suitable for both experienced calibration specialists and training environments like educational laboratories.
