CE620 444-620-000-111-A2-B100-C01 Piezoelectric Accelerometer

The CE620 444‑620‑000‑111‑A2‑B100‑C01 is a premium piezoelectric accelerometer with integrated electronics from Meggitt’s renowned vibro‑meter® product line, specifically engineered for general‑purpose vibration monitoring in potentially explosive atmospheres where intrinsic safety is required and measurement flexibility is paramount. This Ex‑certified version features a sensitivity of 100 mV/g and is supplied as a sensor‑only configuration, allowing the user to select from a comprehensive range of cable assemblies that are compatible with hazardous area installations. The sensor delivers a voltage output signal proportional to acceleration, with an extended frequency response from 0.5 Hz to 14 kHz, making it suitable for a wide array of rotating and reciprocating machinery in oil refineries, chemical plants, gas terminals, offshore platforms, and mining operations where explosive gas, dust, or firedamp may be present.

The CE620 444‑620‑000‑111‑A2‑B100‑C01 is an industry‑standard IEPE (Integrated Electronics Piezo Electric) sensor that requires a constant current power supply (2 to 10 mA) and operates from a 22 to 28 VDC supply. It provides a low‑impedance voltage output with a nominal bias voltage of 12 VDC, which carries the AC vibration signal superimposed on the DC level. The integrated electronics incorporate an internal shield and are galvanically isolated from the sensor case, ensuring exceptional noise immunity, reduced ground‑loop interference, and stable bias‑voltage performance even in electrically noisy industrial environments. For Ex ia installations, the sensor must be connected through an approved intrinsically safe barrier or galvanic isolation unit that limits the voltage, current, and energy to levels that cannot ignite the explosive atmosphere, in accordance with the parameters specified in the Ex certificates.

The sensor is housed in a hermetically sealed stainless‑steel case (AISI 316L) with an IP68 protection rating, offering full protection against dust, prolonged water immersion, and a wide range of industrial contaminants. The rugged, circular MIL‑C‑5015‑105L‑4P connector features a threaded coupling and keyway, providing a secure, vibration‑proof interface that mates with standard MIL‑C/DTL‑5015 type connectors used on Meggitt’s recommended cable assemblies. The sensor‑only format gives the user the freedom to choose cables with different insulations (RADOX®, Teflon® FEP, or polyurethane), overbraids, and protection tubes, optimising the measurement chain for the specific thermal, chemical, and mechanical challenges of each hazardous area installation.

With an extended frequency response of ±5 % from 0.5 Hz to 14 kHz, a nominal resonant frequency of 40 kHz, and a dynamic range of ±80 g, the CE620 444‑620‑000‑111‑A2‑B100‑C01 captures low‑frequency structural vibrations and high‑frequency gearmesh signatures with equal fidelity. Its temperature range of –55 °C to 120 °C, combined with excellent temperature stability, ensures reliable operation in both cryogenic and high‑temperature process environments. The sensor carries ATEX (LCIE 20 ATEX 3039 X) and IECEx (IECEx LCIE 20.0026X) certifications for Ex ia IIC T4 Ga (gas zones 0, 1, 2) and Ex ia IIIC T135°C Da (dust zones 20, 21, 22), as well as Ex I M1 for mining applications (firedamp). EA3C Russian Federation certification is also available. This makes the CE620 444‑620‑000‑111‑A2‑B100‑C01 one of the most versatile Ex‑certified accelerometers for global deployment.

This product introduction provides a comprehensive description of the CE620 444‑620‑000‑111‑A2‑B100‑C01, including key features, applications, detailed technical specifications in tabular form, installation guidelines, ordering information, and available accessories. All information is derived from the official Meggitt data sheet (CE620, 2022) and reflects the company’s commitment to engineering excellence and safety in extreme environments.

Key Features and Benefits

Ex Certified for Hazardous Areas – The CE620 444‑620‑000‑111‑A2‑B100‑C01 is approved for use in potentially explosive atmospheres with ATEX (LCIE 20 ATEX 3039 X) and IECEx (IECEx LCIE 20.0026X) certifications for Ex ia IIC T4 Ga (gas zones 0, 1, 2), Ex ia IIIC T135°C Da (dust zones 20, 21, 22), and Ex I M1 (mining – firedamp). EA3C Russian Federation certification is also available (marked on products as applicable). This ensures global compliance for installation in the most severe hazardous areas.

High Sensitivity and Wide Dynamic Range – With a sensitivity of 100 mV/g ±5 % and a dynamic range of ±80 g, the sensor captures a broad spectrum of vibration amplitudes, from subtle bearing wear to severe imbalance events, without saturation.

Extended Frequency Response – The sensor offers a flat frequency response of ±5 % from 0.5 Hz to 14 kHz, covering very low‑frequency structural motions and high‑frequency gearmesh and blade‑pass frequencies. The –3 dB point at the low end extends even lower, enabling measurement of ultra‑slow machinery.

Low Noise and High Resolution – The residual electrical noise is exceptionally low, with spectral density as low as 5 μg/√Hz at 100 Hz and above, ensuring clear detection of low‑level vibrations. The internal shielding and isolated electronics further suppress electromagnetic interference.

Integrated Electronics (IEPE) – The built‑in charge‑to‑voltage converter eliminates the need for an external charge amplifier. The 2‑wire interface carries both power and signal, simplifying cabling and reducing system cost. The sensor operates with a constant current of 2 to 10 mA and a supply voltage of 22 to 28 VDC.

Ground‑Isolated Case with Internal Shield – The sensor case is electrically isolated from the signal ground, with a minimum isolation resistance of 100 MΩ, preventing ground loops. An internal shield further enhances noise rejection, ensuring clean signal transmission even when mounted on grounded metal structures.

Rugged IP68 Stainless‑Steel Construction – The hermetically sealed AISI 316L stainless‑steel housing provides IP68 protection, making the sensor impervious to dust, water immersion, and corrosion. This ensures long‑term reliability in the harshest industrial environments, including offshore, chemical, and outdoor installations.

Wide Operating Temperature Range – The CE620 444‑620‑000‑111‑A2‑B100‑C01 operates continuously from –55 °C to 120 °C, with a temperature sensitivity deviation of –10 % at –55 °C and +5 % at 120 °C, referenced to 20 °C. This makes it suitable for applications ranging from cryogenic pumps to hot turbine casings in hazardous areas.

High Shock and Vibration Tolerance – With a continuous vibration limit of 500 g peak and a shock limit of 5000 g peak, the sensor withstands severe mechanical transients without damage, ensuring survivability in demanding machinery environments.

Low Base Strain Sensitivity – The base strain sensitivity is only 0.0002 g peak/με, minimising measurement errors caused by mounting surface deformation, a common issue in thin‑walled structures.

Sensor‑Only Flexibility – The sensor‑only format (C01 option) allows the user to select from a variety of cable assemblies (EC318, EC319, EC622, EC632) with different cable materials, overbraids, and protection tubes, tailoring the installation to specific thermal, chemical, and mechanical requirements, while ensuring that the cable assembly is suitable for use with intrinsic safety barriers.

Factory Calibration – Each unit is dynamically calibrated at the factory; no subsequent calibration is required under normal use, reducing maintenance costs.

CE Marked and RoHS Compliant – The sensor meets European Union EMC (2014/30/EU) and RoHS (2011/65/EU) requirements, ensuring global acceptance.

Applications

The CE620 444‑620‑000‑111‑A2‑B100‑C01 is ideally suited for general‑purpose vibration monitoring in hazardous areas (gas, dust, and mining) where intrinsic safety is required, including:

• Oil and Gas Industry – Monitoring of compressors, pumps, turbines, and reciprocating machinery in refineries, gas processing plants, and offshore platforms where flammable gases (IIC group) are present.

• Chemical and Petrochemical Plants – Surveillance of reactors, mixers, centrifuges, and fans in Zone 0, 1, and 2 classified areas where explosive vapours or dusts may occur.

• Pharmaceutical and Food Processing – Vibration monitoring in solvent‑handling areas and dust‑explosive environments (e.g., sugar, flour, starch) where intrinsic safety is mandatory.

• Mining – Monitoring of crushers, mills, conveyors, and ventilation fans in coal mines and other extractive industries where firedamp (methane) may be present (Ex I M1 certification).

• Power Generation – Vibration measurement on gas turbines, generators, and auxiliary equipment in co‑generation and thermal power plants with potential explosive atmospheres.

• Marine and Offshore – Propulsion systems, deck machinery, and cargo pumps on tankers and FPSO vessels operating in hazardous zone classifications.

• Wastewater and Biogas – Monitoring of pumps, blowers, and mixers in biogas plants and wastewater treatment facilities where methane or hydrogen sulphide may be present.

• Hazardous Area Test and Measurement – Temporary or permanent installations for performance validation and predictive maintenance in Ex‑classified zones.

Detailed Description of the Ex Sensor‑Only Version (444‑620‑000‑111‑A2‑B100‑C01)

The CE620 444‑620‑000‑111‑A2‑B100‑C01 is the Ex‑certified, sensor‑only variant of the CE620 family, featuring a sensitivity of 100 mV/g and a temperature range of –55 °C to 120 °C (option A2). It is designed for general‑purpose vibration monitoring in hazardous areas where intrinsic safety (Ex ia) is required and where the user needs the flexibility to select the most appropriate cable assembly for the specific installation. The sensor is built around a piezoelectric sensing element that generates an electrical charge proportional to acceleration. The integrated electronics package, housed within the sensor casing, converts this charge into a low‑impedance voltage signal, which is transmitted over a two‑wire shielded cable.

The sensor’s output is a voltage signal consisting of a DC bias voltage (nominal 12 V) and an AC vibration component superimposed on it. The bias voltage provides a reference level and also powers the internal electronics. The sensor requires an external constant current power supply (IEPE conditioner) that provides a current source between 2 and 10 mA (typically 4 mA) and a DC voltage of 22 to 28 V. The current source is connected in series with the signal line, and the AC vibration signal is measured across a load resistor in the monitoring system, typically extracting the AC component via a high‑pass filter. The low‑frequency cutoff is determined by the time constant of the coupling capacitor and load resistor; the sensor itself has a –3 dB point at 0.5 Hz, making it suitable for very low‑frequency measurements.

For Ex ia installations, the sensor must be connected through an approved intrinsically safe barrier or galvanic isolation unit that limits the voltage, current, and energy to levels that cannot ignite the explosive atmosphere. The barrier must comply with the parameters specified in the Ex certificate (LCIE 20 ATEX 3039 X and IECEx LCIE 20.0026X). The sensor itself is designed with internal protection to ensure that under fault conditions, the energy remains below ignition thresholds. The intrinsic safety parameters (e.g., maximum voltage Ui, current Ii, power Pi, capacitance Ci, inductance Li) are provided in the certificate and must be respected when designing the loop.

The ground‑isolated design, with an internal shield, ensures that the sensor case and mounting base are electrically isolated from the signal ground with a minimum isolation resistance of 100 MΩ. This is critical in industrial settings where multiple earth points can create ground loops, leading to measurement errors and noise. The internal shield further attenuates electromagnetic interference, ensuring clean signal transmission even in environments with strong electrical fields.

The mechanical construction features a hermetically welded stainless‑steel housing (AISI 316L) that provides IP68 protection against dust and prolonged water immersion. The sensor’s connector is a rugged, circular 2‑pin MIL‑C‑5015‑105L‑4P type with a threaded coupling and keyway, ensuring a secure, vibration‑resistant interface that prevents accidental disconnection. The connector mates with standard MIL‑C/DTL‑5015 type connectors used on Meggitt’s recommended cable assemblies. For Ex installations, the cable assembly must be selected from those that maintain the intrinsic safety integrity – typically those with appropriate cable capacitance and inductance parameters, and often with a metallic overbraid or protection tube to prevent mechanical damage.

The mounting interface is a 1/4″‑28 UNF‑2A external thread, and the sensor is supplied with two adapter studs: one 1/4″‑28UNF to 1/4″‑28UNF and one 1/4″‑28UNF to M8×1.25. These allow direct mounting onto common machine threads. The recommended mounting torque for the stud is 2.4 N·m (1.8 lb‑ft), ensuring proper coupling and optimal high‑frequency response.

The CE620 444‑620‑000‑111‑A2‑B100‑C01 is factory‑calibrated at a reference frequency and amplitude, with the sensitivity verified to be within ±5 % of the nominal 100 mV/g. The calibration is performed using a known acceleration standard, and no further calibration is required during the sensor’s lifetime under normal operating conditions. However, periodic verification (e.g., every 2‑5 years) is recommended for critical safety‑related applications.

This sensor‑only version (C01 option) does not include a cable, allowing the user to select from a range of cable assemblies (EC318, EC319, EC622, EC632) that differ in cable material (RADOX®, Teflon® FEP, polyurethane), protection (flexible stainless‑steel hose, overbraid), and environmental rating (standard, splashproof, higher temperature). This flexibility ensures that the measurement chain can be optimised for the specific thermal, chemical, and mechanical demands of each hazardous area installation, while ensuring that the chosen cable and connectors are compatible with the Ex ia requirements.

The Ex certification covers gas groups IIC (including hydrogen, acetylene) and IIIC (conductive dusts), as well as mining applications (Ex I M1 for firedamp). The temperature class T4 (135 °C) ensures that the sensor surface temperature does not exceed 135 °C under normal or fault conditions, making it suitable for atmospheres with ignition temperatures above 135 °C. The sensor is therefore suitable for the most severe hazardous area classifications, including Zone 0 (continuous explosive gas atmosphere) and Zone 20 (continuous explosive dust atmosphere).

Installation and Mounting Guidelines

Proper installation is essential to achieve the specified performance and maintain the Ex certification of the CE620 444‑620‑000‑111‑A2‑B100‑C01. The following guidelines are based on Meggitt’s recommended practices and the requirements of the applicable Ex certificates:

• Mounting Surface Preparation – The mounting surface should be flat, smooth, and clean. Any burrs, paint, or corrosion must be removed to ensure full contact between the sensor base (or adapter stud) and the machine surface. A surface finish of 1.6 µm (63 µin) or better is recommended for optimal high‑frequency response.

• Adapter Stud Selection – The sensor is supplied with two adapter studs: one 1/4″‑28UNF (straight) and one M8×1.25. Choose the stud that matches the threaded hole in the machine or the mounting block. If a different thread is required (e.g., M6), optional mounting adaptors (MA122_012 or MA122_021) are available.

• Torque Application – Screw the chosen stud into the sensor base (using the 1/4″‑28 UNF‑2A thread) and tighten to the recommended torque of 2.4 N·m (1.8 lb‑ft). Then mount the assembled sensor onto the machine surface, applying the appropriate torque for the machine thread (e.g., 15‑20 N·m for M8, but refer to the machine manufacturer’s recommendations). Do not over‑torque, as this may damage the threads or the sensor housing.

• Orientation and Alignment – The sensor is sensitive along its principal axis (marked on the housing). Align the sensor such that the principal axis coincides with the direction of the vibration to be measured (axial, radial, or tangential). Refer to the installation manual for detailed orientation diagrams.

• Cable Assembly Selection and Connection – Ex Requirements – As this is a sensor‑only version, select a suitable cable assembly from the available options (EC318, EC319, EC622, EC632). For Ex ia installations, the cable assembly must be selected from those certified for use with the sensor and must maintain the intrinsic safety parameters. The cable must be routed with a minimum bend radius to avoid stress and internal damage. The cable shield must be grounded at one end (typically at the control panel) to avoid electromagnetic interference, but care must be taken not to create ground loops. All cable glands and junction boxes in the hazardous area must be Ex‑certified and installed according to local regulations. Ensure the connector is fully engaged and the threaded coupling is tightened to prevent loosening under vibration.

• Electrical Connections – Intrinsic Safety – The sensor must be connected through an approved intrinsically safe barrier or galvanic isolation unit (e.g., GSI127) that limits the voltage, current, and power to the values specified in the Ex certificate (LCIE 20 ATEX 3039 X / IECEx LCIE 20.0026X). The barrier must be located in the safe area or be certified for installation in the hazardous area. The supply voltage must be within 22 to 28 VDC, and the current must be between 2 and 10 mA. The signal is measured as the AC voltage on the bias level (typically 12 V) via a decoupling capacitor in the monitoring system. Ensure the monitoring system provides the appropriate high‑pass filtering (usually with a cutoff frequency at or below 0.5 Hz). The cable capacitance and inductance must be within the permissible limits to avoid spark ignition. Refer to the certificate for specific parameters (Ui, Ii, Pi, Ci, Li) and special conditions for safe use.

• Grounding – The sensor’s base is isolated from the signal ground, so the mounting surface can be at any potential without affecting the signal. However, the cable shield should be grounded at one end (usually at the monitoring system) to minimise electromagnetic interference. Follow the grounding practices recommended in the system’s installation manual and the Ex certificate requirements.

• Thermal Considerations – The sensor is rated for continuous operation up to 120 °C, which ensures the surface temperature does not exceed the T4 rating (135 °C) even under fault conditions. If the mounting surface exceeds 120 °C, use a thermal insulating adaptor (e.g., MA122_021) or mount the sensor remotely with an extension rod. The connector and cable must also be rated for the expected temperature; for high‑temperature Ex applications, use cables with suitable insulation such as RADOX® or Teflon® FEP.

• Protection from Physical Damage – In harsh environments, protect the sensor and cable from impacts, abrasion, and chemical attack. Use protective covers or conduits if necessary. The IP68 rating ensures the sensor is dust‑tight and protected against water immersion, but mechanical protection is still recommended.

• Hazardous Area Precautions – Installation must be carried out by competent personnel trained in Ex practices. All wiring, cable glands, and junction boxes must comply with local regulations and the relevant Ex standards. The sensor and its associated cables must be protected from mechanical damage and chemical attack. Regular inspection and maintenance as per the plant’s safety procedures are mandatory. The Ex certificate includes special conditions for safe use (e.g., the sensor must be used with a certified barrier, and the cable must be secured to avoid strain).

• Commissioning – Before energising, verify that all connections are correct, the Ex barrier is properly installed, and the cable routing does not subject the connector to excessive strain. Perform a functional test using a known vibration source to confirm sensitivity and bias voltage. Record the bias voltage and signal levels for future reference.

Commissioning and Verification

After installation, the CE620 444‑620‑000‑111‑A2‑B100‑C01 should be verified using a known vibration source (e.g., a portable shaker or a reference accelerometer) or by comparing with a known good sensor. The bias voltage should be measured to confirm it is approximately 12 V (within ±1 V). The AC signal should be checked for proper sensitivity; a known acceleration level (e.g., 1 g at 80 Hz) should produce the expected output (100 mV/g). Also verify that the signal is free from excessive noise and that the low‑frequency cutoff is appropriate for the intended measurement. In Ex installations, verify that the barrier is operating within its specified parameters. For long‑term monitoring, regular system checks during routine maintenance are recommended.

Accessories

A range of accessories is available to complement the CE620 444‑620‑000‑111‑A2‑B100‑C01, including cable assemblies, adaptor studs, and mounting adaptors. The sensor is supplied with two adaptor studs; optional items are listed below. For Ex installations, ensure that the cable assemblies and connectors are suitable for use with intrinsic safety barriers.

Note: Cable length must be specified when ordering any cable assembly. For EC31x cables, any length can be specified; for EC6x2 cables, standard lengths are 2, 5, 10, 15, 20, or 30 m (ordering option codes L2000, L5000, L10000, etc.). For Ex installations, ensure the cable assembly and connector are certified for the intended hazardous area and that the total loop parameters (capacitance, inductance) remain within the limits specified in the Ex certificate.

Disposal and Environmental Compliance

At the end of its service life, the CE620 444‑620‑000‑111‑A2‑B100‑C01 must be disposed of in accordance with local environmental regulations. The sensor contains stainless steel, electronic components, and piezoelectric materials. In the European Union, the Waste Electrical and Electronic Equipment (WEEE) Directive applies – separate collection and recycling are mandatory. Meggitt supports environmentally responsible disposal and can provide guidance on proper recycling channels.