Editorial Technical Reference

Signal Transmitter

This page explains how Signal Transmitter is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Electronic device that converts sensor signals into standardized output signals for transmission to control systems.

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Product Specifications

Technical details and manufacturing context for Signal Transmitter

Definition
A signal transmitter is a critical component within pressure and temperature sensor systems that receives raw electrical signals from sensing elements, conditions and amplifies these signals, and converts them into standardized output formats (such as 4-20mA, 0-10V, or digital protocols) suitable for transmission over distances to monitoring, control, or data acquisition systems. This directory entry covers transmitters used in industrial machinery and equipment manufacturing, typically housed in stainless steel or aluminum alloy enclosures with connection terminals. The transmitter's core is a printed circuit board populated with electronic components such as ICs, resistors, and capacitors. It accepts standard analog input signals (4–20 mA) and provides a corresponding output signal (4–20 mA) for loop-powered operation at 24 V DC (±10%). Typical accuracy is ±0.1% of full scale, with a response time of ≤100 ms and load resistance up to 600 Ω for 4–20 mA output. The device operates in temperatures from -40 to 85 °C and can be stored from -40 to 100 °C. Ingress protection ratings range from IP65 to IP67 per IEC 60529, and isolation voltage is 1500 V AC between input and output. Housing material is typically 316L stainless steel per ASTM A240, with weight varying from 0.5 to 1.5 kg depending on the housing. These values are reference ranges; actual specifications must be confirmed with the manufacturer for the specific model and application. The transmitter is designed for industrial environments, ensuring reliable signal transmission over distances. It is essential for process control, monitoring, and data acquisition systems. Always verify model-specific parameters and standards with the legal manufacturer or supplier before procurement or installation.
Working Principle
The transmitter receives low-level electrical signals from pressure or temperature sensing elements (like strain gauges, RTDs, or thermocouples), amplifies and linearizes the signal, applies temperature compensation if needed, then converts it to a standardized industrial output signal through signal conditioning circuits and output drivers. The process involves signal conditioning, amplification, and conversion to a 4–20 mA current loop, which is less susceptible to noise and voltage drops over long distances. The transmitter is loop-powered, meaning it draws power from the same two wires used for the output signal, simplifying wiring. It also provides electrical isolation between input and output to protect against ground loops and interference. The output can drive loads up to 600 Ω, making it compatible with most control systems. The device is designed for reliable operation in industrial environments, with ingress protection up to IP67 and a wide operating temperature range. The working principle ensures accurate and stable transmission of sensor data to monitoring and control systems.
Common Materials
Printed Circuit Board (PCB), Electronic Components (ICs, resistors, capacitors), Housing (stainless steel or aluminum alloy), Connection Terminals
Technical Parameters
ParameterTypical rangeNotes & selection driver
Input Signal4–20 mAStandard analog input
Output Signal4–20 mAStandard analog output
Accuracy±0.1 % FSTypical accuracy
Supply Voltage24 ±10% V DCTypical loop-powered
Operating Temperature-40–85 °CIndustrial range
Storage Temperature-40–100 °CNon-operating
Ingress ProtectionIP65–IP67Dust-tight and water-resistantIEC 60529
Isolation Voltage1500 V ACInput to output
Response Time≤100 msTypical step response
Load Resistance0–600 ΩFor 4–20 mA output
Housing Material316LStainless steelASTM A240
Weight0.5–1.5 kgDepending on housing

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Signal Conditioning Circuit
    Amplifies, filters, and linearizes the raw sensor signal
    Material: PCB with electronic components
  • Microprocessor/ASIC
    Processes signals, applies compensation algorithms, and manages output
    Material: Semiconductor silicon
  • Output Driver Circuit
    Converts processed signal to standardized industrial output format
    Material: PCB with power transistors and components
  • Housing/Enclosure Part
    Protects internal electronics from environmental factors and provides mounting
    Material: Stainless steel or aluminum alloy
  • Connection Terminals Part
    Provides electrical connections for input, output, and power
    Material: Brass or nickel-plated copper
  • Electrical Isolation
    Keeps the sensor side and the loop side galvanically apart.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 100 bar
other spec: Signal accuracy: ±0.1% of span, Input impedance: >1 MΩ, Output types: 4-20mA, 0-10V, HART, PROFIBUS
temperature: -40°C to 85°C
Media Compatibility
✓ Process liquids (water, oils, chemicals) ✓ Industrial gases (air, nitrogen, CO2) ✓ Steam applications
Unsuitable: Highly corrosive media (concentrated acids, chlorine gas) without specialized isolation
Sizing Data Required
  • Input signal type and range (e.g., mV, mA, RTD, thermocouple)
  • Required output signal protocol (4-20mA, 0-10V, digital bus)
  • Environmental protection rating (IP/NEMA classification for installation area)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Drift in output signal
Cause: Sensor element degradation due to environmental contamination (moisture, dust, chemicals) or thermal stress causing calibration shift
Complete signal loss or erratic readings
Cause: Electrical connection failure from corrosion, vibration-induced wire fatigue, or internal circuit board component failure
Maintenance Indicators
  • Inconsistent or fluctuating readings on the control system display compared to expected process values
  • Audible buzzing, crackling, or complete silence from the transmitter housing indicating electrical arcing or component failure
Engineering Tips
  • Implement regular calibration checks using certified reference instruments to detect and correct drift before it impacts process control
  • Ensure proper environmental sealing and install vibration-damping mounts to protect internal components from contamination and mechanical stress

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 60529: IP Rating for Enclosure Protection IEC 60079: Explosive Atmospheres (ATEX)

Quoted from the published standard.

Manufacturing Precision
  • Output Signal Accuracy: +/-0.25% of full scale
  • Temperature Drift: +/-0.02% per °C
Quality Inspection
  • EMC (Electromagnetic Compatibility) Testing
  • Calibration Verification against NIST-traceable standards

Manufacturers of Signal Transmitter

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Frequently Asked Questions

What is the typical input and output signal for this signal transmitter?

The typical input signal is 4–20 mA analog, and the output signal is also 4–20 mA. This standard current loop is widely used in industrial applications for its noise immunity and ability to transmit over long distances.

What is the supply voltage requirement?

The transmitter is loop-powered and typically operates at 24 V DC with a tolerance of ±10%. This means the supply voltage should be between 21.6 V and 26.4 V DC.

What is the accuracy and response time?

Typical accuracy is ±0.1% of full scale (FS). The response time is ≤100 ms, which is the time for the output to reach a specified percentage of the final value after a step change in input.

What are the environmental and protection ratings?

The operating temperature range is -40 to 85 °C, and storage temperature is -40 to 100 °C. Ingress protection is IP65 to IP67 per IEC 60529, meaning it is dust-tight and protected against water jets or temporary immersion, depending on the specific rating.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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