IQS900 204-900-000-011 A5-B21-C1-H05-I1 Signal Conditioner

The IQS900 Signal Conditioner is a high-performance, modular core component of the non-contact eddy current displacement measurement system from Parker Meggitt (formerly the vibro-meter product line). It works in conjunction with the TQ402/TQ412 series eddy current sensors and the EA402 extension cable to form a complete displacement/vibration measurement chain, enabling real-time, precise measurement of critical parameters such as relative shaft vibration, axial displacement, eccentricity, and rotational speed in rotating machinery.

The specific model IQS900 204-900-000-011 A5-B21-C1-H05-I1 is a high-precision signal conditioner with international explosion-proof certification, specially designed for Zone 2 gas hazardous areas and Zone 22 dust hazardous areas. It features a 2 mm small measurement range design with a high sensitivity of 8 mV/μm, making it suitable for small gap measurement scenarios requiring extremely high accuracy. The product complies with API 670 standard recommendations and is compatible with mainstream monitoring systems such as VM600 and VibroSmart, making it an ideal choice for rotating machinery monitoring in explosion-proof applications such as petrochemical, natural gas, and offshore platforms.

Key Features

• Non-contact eddy current measurement principle: Based on high-frequency electromagnetic field induction, unaffected by media such as oil and water vapor, suitable for dynamic and static measurements of high-speed rotating machinery.

• High sensitivity: 2 mm linear measurement range, sensitivity 8 mV/μm (200 mV/mil), output voltage -1.6 V ~ -17.6 V.

• Wide frequency response: DC ~ 20 kHz (-3 dB), supports both static displacement and dynamic vibration measurement simultaneously.

• Low output impedance: < 100 Ω (DC), < 300 Ω (20 kHz), supports long-distance signal transmission.

• Functional safety: Hardware design meets SIL 2 (IEC 61508) capability requirements.

• Explosion-proof certifications: ATEX, IECEx, CCSAus, UKEX, KGS, EAC and other international explosion-proof certifications, suitable for Zone 2 gas and Zone 22 dust hazardous areas.

• Temperature compensation: Maintains measurement stability across the full temperature range of -40°C ~ +85°C.

• Modular design: Plug-in screw terminals simplify on-site wiring and maintenance.

• Flexible mounting: Supports DIN rail (TH 35) mounting or direct fixing with M4 screws.

• Interference immunity: Complies with EN 61000-6-2/4 industrial environment electromagnetic compatibility standards.

• Protection functions: Outputs feature overvoltage (-33 VDC typical) and short-circuit protection (35 mA current limiting).

• System interchangeability: Sensors, cables, and conditioners are all interchangeable without requiring recalibration.

  
  

Model Code Breakdown

Note: The exact meaning of model codes may change with product revisions. It is recommended to confirm with the latest data sheet or official information from Parker Meggitt.

System Composition and Operating Principle

System Composition

The complete IQS900 measurement system consists of the following three components:

Operating Principle

1. Excitation: The internal high-frequency oscillator in the IQS900 generates an excitation signal, driving the sensor coil via the cable, creating a high-frequency electromagnetic field around the coil.

2. Induction: When a metallic target (e.g., a rotating shaft) approaches the sensor tip, eddy currents are induced on the target surface. These currents react back on the sensor coil, altering its equivalent impedance.

3. Demodulation: The modulation/demodulation circuit inside the IQS900 detects the impedance change and converts it into a linear voltage signal proportional to the target gap.

4. Output: The output voltage signal (-1.6 V ~ -17.6 V) is transmitted via screw terminals to the monitoring system for display, alarm, or protection actions.

   
   

Performance Curves and Measurement Data

Output Characteristics

Under standard test conditions (target material: VCL 140 steel, temperature: 23°C ± 5°C), the typical output characteristics of IQS900 with TQ402 are as follows:

The output voltage has a highly linear relationship with the gap, with a slope of 8 mV/μm.

Linearity Error

Over the entire measurement range (0.15 ~ 2.15 mm), the typical linearity error is < ±50 μm (relative to the ideal straight line), with maximum error < ±100 μm.

Temperature Drift

Frequency Response

The frequency response is flat up to 20 kHz (-3 dB), meeting the vibration measurement requirements of most rotating machinery.

Installation and Connections

Mounting Methods

• Direct Screw Mounting: Via two M4 threaded holes on the bottom (85 mm spacing) onto a mounting plate or inside a cabinet.

• DIN Rail Mounting: Using the MA130 rail adapter for quick installation on TH 35 standard rails (according to EN 50022 / IEC 60715).

Connector Definitions

Explosion-proof Installation Notes

• The IQS900 must be installed in an enclosure with at least IP54 protection rating.

• The enclosure should be suitable for hazardous areas with appropriate markings.

• All cable entries must use explosion-proof cable glands to ensure sealing.

• Coaxial connectors should be hand-tightened until locked; do not use tools to overtighten.

• Terminal blocks are pluggable for pre-wiring convenience, but must be operated with power disconnected.

  
  

Accessories and Options

Total System Length and Cable Combinations

When the IQS900 is used with TQ402/TQ412 and EA402, the supported Total System Lengths (TSL) are 1 m, 5 m, and 10 m. The following table lists recommended cable combinations:

Cable Length Trimming

Due to the electrical characteristics of the coaxial cable, the actual cable length requires electrical trimming to ensure system performance and interchangeability:

When ordering, specify the required nominal length; Meggitt will perform internal electrical trimming.

Compatible Monitoring Systems

The output signal from the IQS900 can be directly connected to the following monitoring systems (in Ex applications, must be connected via safety barriers or isolation units):

Ordering Information

Note: "xxx" in the specific ordering numbers represents cable length. Please consult Parker Meggitt or an authorized distributor for complete ordering codes.

Typical Application Examples

Example 1: Compressor Vibration Monitoring in Oil Refinery

• Scenario: Critical gas compressors in an oil refinery are located in Zone 2 hazardous areas, requiring real-time monitoring of shaft vibration and axial displacement.

• Solution: Each compressor is equipped with 4 TQ402-A2 sensors (radial vibration) and 2 TQ412-A2 sensors (axial displacement), connected via EA402-A2 extension cables to IQS900-A5 signal conditioners installed in an explosion-proof cabinet, with output signals connected to the VM600 monitoring system.

• Result: The system operates stably, successfully providing early warnings for multiple potential failures, avoiding unplanned shutdowns.

Example 2: Gap Monitoring of Offshore Platform Turboexpander

• Scenario: The rotor-to-casing gap of a turboexpander on an offshore natural gas platform is extremely small, requiring high-precision monitoring, and the platform is classified as a hazardous area.

• Solution: TQ402-A2 sensors combined with IQS900-A5 (B21 configuration) are used, with the 2 mm range providing 8 mV/μm high sensitivity for precise gap monitoring.

• Result: Achieved gap measurement at 0.01 mm resolution, ensuring equipment safety.

  
  

Safety and Maintenance Recommendations

1. Before Installation:

• Verify that the product model and explosion-proof markings meet the site area classification requirements.

• Inspect the product for external damage and ensure connectors are clean.

2. During Installation:

• Strictly follow explosion-proof installation codes, ensuring correct enclosure protection rating and cable entry methods.

• Hand-tighten coaxial connectors to lock; do not use tools.

• Terminal block insertion/removal should only be performed with power disconnected.

3. During Operation:

• Regularly check enclosure seals and cable glands for tightness.

• The monitoring system should record IQS900 output signals; if anomalies are detected (e.g., output outside normal range), immediately inspect the measurement chain.

4. Maintenance:

• Before maintenance in hazardous areas, obtain work permits and disconnect power.

• Clean with a dry soft cloth; do not use organic solvents.

• When replacing components, use identical models and explosion-proof等级 spares.

5. Disposal:

• Dispose of products as electronic waste in an environmentally friendly manner; do not discard randomly.