IQS900 204-900-000-011 A5-B21-C1-H10-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. This product is widely used in online condition monitoring and protection systems for equipment such as steam turbines, compressors, pumps, generators, and blowers.

The specific model IQS900 204-900-000-011 A5-B21-C1-H10-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 voltage output (-1.6 V ~ -17.6 V) and a high sensitivity of 8 mV/μm, making it suitable for high-precision measurement of small gaps. 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, offshore platforms, and coal mining.

Key Features and Benefits

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

• 2 mm high-precision range: Linear range 0.15 ~ 2.15 mm, sensitivity 8 mV/μm (200 mV/mil), output voltage -1.6 V ~ -17.6 V (corresponding to min. to max. gap), providing excellent resolution and linearity.

• Wide frequency response: DC ~ 20 kHz (-3 dB), capable of measuring both static displacement (e.g., axial position) and dynamic vibration (e.g., shaft vibration) simultaneously, meeting the monitoring requirements of most industrial rotating machinery.

• Low output impedance: < 100 Ω (DC), < 300 Ω (20 kHz), supporting long-distance signal transmission (up to hundreds of meters) and easy interfacing with various monitoring systems.

• Functional safety: Hardware design meets SIL 2 (IEC 61508) capability requirements, suitable for safety-related applications (C2 diagnostic version is certified; C1 model shares the same hardware foundation).

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

• Temperature compensation: Employs temperature-compensated design to maintain measurement stability across the full temperature range of -40°C ~ +85°C.

• Modular design: Plug-in screw terminals simplify on-site wiring and maintenance; sensors, cables, and conditioners are interchangeable without requiring recalibration.

• Flexible mounting (H10 housing) : Supports DIN rail (TH 35) mounting or direct fixing with M4 screws; H10 housing configuration may include pre-installed rail adapter or enhanced mounting options.

• High 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), enhancing system reliability.

• System interchangeability: All components (sensors, extension cables, signal conditioners) are individually calibrated and can be used interchangeably without recalibration, facilitating spare parts management and on-site replacement.

  
  

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. H10 and I1 are custom options; please consult the manufacturer for specific details.

Explosion-proof Certification Details

This IQS900 model (A5 option) has passed multiple international explosion-proof certifications and is suitable for potentially explosive atmospheres. The following table summarizes the main certification information:

Explosion-proof Installation Requirements:

• IQS900 (A5) is only suitable for Zone 2 gas hazardous areas and Zone 22 dust hazardous areas.

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

• Cables entering the enclosure must use explosion-proof cable glands (such as SG1xx series).

• The associated TQ402/TQ412 sensors and EA402 cables must use the A2 intrinsic safety explosion-proof version, suitable for Zone 0/1/2 areas.

• The special conditions for safe use specified in the corresponding explosion-proof certificates must be strictly followed.

• Power must be disconnected before any wiring or maintenance operations in hazardous areas.

  
  

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 (typical frequency approx. 1 MHz), 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. The impedance change is inversely proportional to the target gap.

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 (B21) 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 (H10 Configuration)

Mounting Methods

• Direct Screw Mounting: Via two M4 threaded holes on the bottom (85 mm spacing) onto a mounting plate or inside a cabinet. M4 stainless steel screws are recommended, with a tightening torque of 1.2 N·m.

• DIN Rail Mounting: H10 housing may be pre-fitted or compatible with the MA130 rail adapter for quick installation on TH 35 standard rails (according to EN 50022 / IEC 60715). To install, angle the conditioner onto the rail, then press down until the latch clicks into place.

Connector Definitions

Terminal Specifications

• Wire cross-section: 0.2 ~ 1.5 mm² (24 ~ 16 AWG)

• Stripping length: 6 ~ 7 mm

• Recommended tightening torque: 0.2 ~ 0.25 N·m

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.

• Ensure the enclosure is properly grounded after installation, complying with explosion-proof requirements.

  
  

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 voltage 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 Shaft Vibration and Displacement Monitoring in Refinery

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

• 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-B21-C1-H10-I1 signal conditioners installed in explosion-proof field enclosures. The voltage output signals are connected to the VM600 monitoring system for trend analysis and alarming.

• Result: The system operates stably, successfully providing early warnings for two early-stage shaft wear failures, avoiding unplanned shutdowns and improving equipment reliability.

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 (<1 mm), requiring high-precision monitoring, and the platform is classified as a hazardous area.

• Solution: TQ412-A2 reverse mount sensors (space-saving) are used in combination with IQS900-A5 (B21 voltage output) to connect the gap signal to the platform Safety Instrumented System (SIS), triggering a shutdown for protection when the gap exceeds limits.

• Result: Achieved gap measurement at 0.01 mm resolution; the voltage output signal is stable with high interference immunity, ensuring equipment safety.

Example 3: Natural Gas Pipeline Compressor Condition Monitoring

• Scenario: A natural gas long-distance pipeline compressor station with multiple compressors requiring centralized monitoring. The distance from the field to the control room is approximately 200 meters.

• Solution: Each compressor is equipped with an IQS900 A5-B21-C1-H10-I1 signal conditioner. Utilizing its low output impedance, the voltage signals are transmitted directly to the VibroSmart monitoring system in the control room without the need for additional signal amplifiers.

• Result: Simplified system architecture, reduced costs, and high signal transmission quality.

  
  

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, ensure connectors are clean and terminals are free from oxidation.

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. If connection is difficult, check alignment.

• Terminal block insertion/removal should only be performed with power disconnected. Verify power supply polarity before wiring.

• Ensure the enclosure is properly grounded, with ground resistance complying with local electrical codes.

3. During Operation:

• Regularly check enclosure seals and cable glands for tightness, and ensure the interior of the enclosure is clean and dry.

• The monitoring system should record IQS900 output signals; if anomalies are detected (e.g., output outside normal range or abnormal fluctuations), immediately inspect the sensor, cable, and conditioner.

• It is recommended to perform a functional test every six months, using a test signal to verify conditioner response.

4. Maintenance:

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

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

• When replacing components, use identical models and explosion-proof grade spares, and recheck all connections.

• Terminal blocks are pluggable for quick replacement, but ensure correct orientation before insertion.

5. Disposal:

• Dispose of products as electronic waste in an environmentally friendly manner; do not discard randomly. The housing material is recyclable; circuit boards require专业处理.