The CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10 is a high‑performance piezoelectric accelerometer with integrated electronics from Meggitt’s renowned vibro‑meter® product line, specifically engineered for general‑purpose vibration monitoring in harsh industrial environments where a long, robust, and sealed cable assembly is essential for reliable signal transmission. This standard, non‑Ex version features a sensitivity of 100 mV/g and is supplied with a factory‑fitted integral cable of 10 metres in length, protected by a stainless‑steel overbraid. This ready‑to‑install configuration eliminates the need for a separate connector at the sensor end, providing a continuous, hermetically sealed connection that is ideal for permanent installations where long‑term signal integrity, protection against environmental ingress, and mechanical durability are critical. 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, from slow‑speed turbines to high‑speed gearboxes, especially where the monitoring electronics are located at a distance from the measurement point.
The CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10 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, a critical advantage when using long cable runs.
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 integral cable is a Teflon® FEP twisted‑pair shielded cable with a stainless‑steel (AISI 316L) overbraid, providing excellent mechanical protection against abrasion, cutting, and chemical attack. The cable is terminated with flying leads (red for positive, white for common), allowing direct connection to the monitoring system or junction box without the need for an intermediate connector. This simplifies installation, reduces potential failure points, and ensures a sealed, leak‑tight assembly from the sensor to the flying leads. The 10‑metre length (L10 option) provides substantial reach, making it ideal for machines where the sensor must be mounted in a difficult‑to‑access location while the monitoring equipment is installed in a control cabinet or safe area.
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 444‑620‑000‑211‑A1‑B100‑C72‑L10 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 (±5 % typical over the full range), ensures reliable operation in both cryogenic and high‑temperature process environments. The sensor’s low noise floor (down to 5 μg/√Hz at higher frequencies) and outstanding electromagnetic immunity (0.2 g at 50 Hz, 0.03 T) make it ideal for precision condition monitoring and predictive maintenance programmes, even when signals are transmitted over a 10‑metre cable.
This product introduction provides a comprehensive description of the CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10, 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 customer support.
Key Features and Benefits
Integral Cable with Stainless‑Steel Overbraid – 10 Metre Length – The factory‑fitted 10‑metre cable (Teflon® FEP, twisted‑pair shielded) with a stainless‑steel (AISI 316L) overbraid provides exceptional mechanical protection, chemical resistance, and durability. The sealed, connector‑less design eliminates potential failure points at the sensor interface, ensuring long‑term signal integrity in harsh environments. The 10‑metre length offers flexibility for installations where the sensor is located far from the monitoring electronics, without requiring additional extension cables and joints.
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, which is particularly important with longer cable runs.
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 444‑620‑000‑211‑A1‑B100‑C72‑L10 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.
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.
Factory Sealed Assembly – The integral cable is factory‑welded to the sensor, ensuring a leak‑tight, hermetically sealed assembly that prevents moisture ingress and guarantees long‑term reliability. The cable’s stainless‑steel overbraid provides additional mechanical protection against abrasion and cutting.
Easy Installation – The flying leads (red/white) allow direct connection to terminal blocks or junction boxes, eliminating the need for a separate connector and simplifying wiring. The sensor is supplied with adapter studs (1/4″‑28UNF and M8×1.25) for versatile mounting.
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 444‑620‑000‑211‑A1‑B100‑C72‑L10 is ideally suited for a wide range of general‑purpose industrial vibration monitoring applications in non‑hazardous areas where a longer cable run is beneficial, including:
Pumps and Compressors – Continuous monitoring of centrifugal, reciprocating, and axial machines for imbalance, cavitation, bearing wear, and surge detection, especially where the sensor is mounted on the machine and the monitor is in a control room.
Fans and Blowers – Condition monitoring of HVAC systems, cooling towers, and process ventilation fans located at height or in remote areas.
Motors and Generators – Vibration analysis of electric motors, diesel generators, and turbine‑generator sets to detect rotor unbalance, misalignment, and bearing defects, with the monitor located away from the machine due to space or safety constraints.
Gearboxes and Gear Drives – High‑frequency measurement for gearmesh and bearing fault detection in industrial gearboxes, where the sensor may be mounted in a confined space and the cable routed to a convenient termination point.
Turbines (Gas, Steam, Hydro) – Monitoring of bearing housing and casing vibration in power generation and mechanical drive applications, often requiring long cable runs from the turbine pedestal to the control panel.
Machine Tools and Spindles – Vibration monitoring of high‑speed spindles and CNC equipment for predictive maintenance, where the sensor is mounted on the tool head and the electronics are housed in a cabinet.
Test and Measurement – Permanent or temporary installations for performance validation, modal analysis, and troubleshooting, where flexibility in sensor placement is required.
Paper, Steel, and Cement Mills – Harsh environment monitoring of rollers, crushers, conveyors, and continuous casting machinery, where sensors are often mounted in dusty, hot areas and the cable must be routed to a clean, accessible junction box.
Marine and Offshore – Vibration measurement on propulsion systems, deck machinery, and auxiliary equipment, where long cable runs are common between the machinery spaces and the bridge or engine control room.
General Industrial Condition Monitoring – Any rotating or reciprocating machinery in factories, power plants, and processing facilities requiring reliable, cost‑effective vibration data with flexible cable routing.
Detailed Description of the Integral Cable Standard Version (444‑620‑000‑211‑A1‑B100‑C72‑L10)
The CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10 is the standard, non‑Ex, integral‑cable variant of the CE620 family, featuring a sensitivity of 100 mV/g, a wide temperature range of –55 °C to 120 °C (option A1), and a factory‑fitted 10‑metre cable with stainless‑steel overbraid. It is designed for permanent installation in ordinary industrial environments where a robust, sealed, connector‑less solution is required to maximise reliability and minimise installation complexity, and where the distance between the sensor and the monitoring electronics exceeds 5 metres. 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 the integral 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.
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 10‑metre cable length is well within the capabilities of the IEPE current‑loop transmission, which can support runs of several hundred metres without signal degradation, provided the cable capacitance is within the limits of the power supply. The Teflon® FEP insulation and shielding ensure low capacitance and high signal integrity.
The mechanical construction features a hermetically welded stainless‑steel housing (AISI 316L) that provides IP68 protection against dust and prolonged water immersion. The integral cable is welded to the sensor at the factory, creating a continuous, leak‑tight seal that prevents moisture ingress and ensures long‑term reliability. The cable is a Teflon® FEP twisted‑pair shielded cable with 2×0.5 mm² conductors, providing excellent electrical insulation and low capacitance. The stainless‑steel overbraid (AISI 316L) offers robust protection against abrasion, cutting, and chemical attack, making the cable suitable for routing through cable trays, conduits, or exposed to harsh environments. The cable is terminated with flying leads (red for positive, white for common), allowing direct wiring to terminal blocks or junction boxes, eliminating the need for an intermediate connector that could be a potential failure point.
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 444‑620‑000‑211‑A1‑B100‑C72‑L10 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 integral‑cable version with 10‑metre length is particularly advantageous for installations where the sensor must be located far from the signal conditioning or monitoring equipment, such as on large machinery where the control room is at a distance, or where the sensor is mounted in a hazardous or inaccessible area and the cable must be routed to a safe junction box. The 10‑metre length provides sufficient reach for most industrial applications, reducing the need for additional cable extensions and connectors, which can introduce signal loss and potential failure points.
It should be noted that this standard version (A1) is not Ex‑certified and must not be used in hazardous areas. For such applications, the Ex‑certified variant with integral cable (e.g., 444‑620‑000‑211‑A2‑B100‑C72‑L10) is available, featuring intrinsic safety (Ex ia) and the same mechanical and electrical performance but with appropriate certification.
Installation and Mounting Guidelines
Proper installation is essential to achieve the specified performance from the CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10. The following guidelines are based on Meggitt’s recommended practices:
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 Routing and Termination – The integral cable has a stainless‑steel overbraid. Route the cable with a minimum bend radius to avoid stress and internal damage (recommended > 25 mm). Secure the cable at intervals using P‑clips or cable ties, but avoid over‑tightening that could deform the overbraid. For a 10‑metre cable, ensure that the cable is not subjected to excessive tension or sharp bends. The flying leads (red and white) should be connected to the monitoring system’s constant current supply and signal input. Connect red to the positive supply/signal line, and white to the return/common. The cable shield should be grounded at one end (typically at the monitoring system) to minimise electromagnetic interference. Ensure the connections are made in a junction box or terminal block that is suitable for the environmental conditions.
Electrical Connections – The sensor requires a constant current power supply. The supply voltage must be between 22 and 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 for the sensor’s specified response). The cable shield should be grounded at one end to minimise electromagnetic interference. For a 10‑metre cable, the cable capacitance (approx. 60 pF/m typical for shielded twisted pair) is well within the drive capability of most IEPE conditioners, but it is advisable to check the total capacitance against the conditioner’s specifications.
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 to minimise electromagnetic interference. Follow the grounding practices recommended in the system’s installation manual.
Thermal Considerations – The sensor is rated for continuous operation up to 120 °C. The cable is rated up to 200 °C, exceeding the sensor’s limit. 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. Ensure that the cable is not routed over hot surfaces that exceed its 200 °C rating.
Protection from Physical Damage – In harsh environments, protect the cable from impacts, abrasion, and chemical attack. The stainless‑steel overbraid provides substantial protection, but additional conduits or protective covers may be required in extreme conditions. The IP68 rating ensures the sensor is dust‑tight and protected against water immersion, but mechanical protection is still recommended.
Hazardous Area Precautions – This standard version (A1) is not Ex‑certified; therefore, it must not be used in potentially explosive atmospheres. For such areas, use the Ex‑certified versions (option A2) and follow the specific installation requirements of the Ex certificates.
Commissioning and Verification
After installation, the CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10 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. For long‑term monitoring, regular system checks during routine maintenance are recommended. With a 10‑metre cable, pay attention to any signal attenuation or noise pickup; the low output impedance (50 Ω) and shielded construction should ensure signal integrity.
Accessories
A range of accessories is available to complement the CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10, including additional adaptor studs and mounting adaptors. The sensor is supplied with two adaptor studs; optional items are listed below.
ITEM | TYPE | DESCRIPTION | PART NUMBER (PNR) |
Supplied Adaptor Studs | – | 1/4″‑28UNF (to 1/4″‑28UNF) and M8×1.25 (to 1/4″‑28UNF) | 809‑601‑000‑011 and 809‑601‑000‑021 |
Optional Adaptor Stud | – | 1/4″‑28UNF‑2A to M8×1 | 809‑601‑000‑031 |
Mounting Adaptors | MA122_012 | 1/4″‑28UNF‑2A to M6, with conic base | 809‑122‑000‑012 |
| MA122_021 | 1/4″‑28UNF‑2A to M6, with conic base (insulating stud) | 809‑122‑000‑021 |
Cable Protection (if needed) | – | Additional conduits or flexible hoses can be used to further protect the integral cable; consult Meggitt for recommendations. | N/A |
Note: As this is an integral cable version, separate cable assemblies are not required. However, if an extension is needed beyond the 10 m length, a junction box can be used to connect the flying leads to a longer cable run, ensuring that the total cable capacitance remains within the limits specified by the monitoring system. The low output impedance of the sensor (50 Ω) typically allows for extensions up to several hundred metres, depending on the conditioner’s drive capability.
Disposal and Environmental Compliance
At the end of its service life, the CE620 444‑620‑000‑211‑A1‑B100‑C72‑L10 must be disposed of in accordance with local environmental regulations. The sensor contains stainless steel, electronic components, and piezoelectric materials; the cable contains fluoropolymer insulation and metal conductors. 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.
