CEMB TR-27 Vibration Transmitter

Overview

The CEMB TR-27 vibration transmitter is an integrated unit designed for reliable monitoring of absolute bearing vibration on any rotating machine. Using two-wire 4-20mA current loop technology, it connects directly to PLC and DCS systems without additional signal conditioning, minimising wiring complexity compared to traditional vibration monitoring installations.

Housed in an AISI 316L stainless steel body with an integral cable and IP68 ingress protection, the TR-27 is engineered for the harshest environments. The wide operating range allows installation on fans, compressors, centrifuges, turbines, pumps, and other rotating equipment where continuous vibration surveillance is required.

Engineering & Design

The transmitter measures absolute vibration of the machine support and converts the signal to a 4-20mA current proportional to vibration velocity or acceleration, depending on the selected configuration. The two-wire loop is powered from the same pair used for the signal, simplifying wiring to a single twisted pair back to the control system.

Available in a standard version with PVC shielded cable and nickel-plated brass cable gland, or a special version for aggressive environments with ETFE shielded armoured cable and AISI 316L stainless steel cable gland, the TR-27 needs no set-up or maintenance after installation. The frequency response covers 10Hz to 1kHz with ±5% linearity, and the mounting thread is machined directly on the stainless body.

Key Features

• 4-20mA two-wire loop output directly to PLC or DCS
• Absolute vibration measurement in velocity or acceleration
• AISI 316L stainless steel body with machine connection thread
• IP68 protection per EN 60529/10.91
• Integral shielded cable with pitch 1m lengths
• Standard PVC cable or aggressive-environment ETFE armoured versions
• Frequency response 10Hz-1kHz with ±5% linearity
• Operating temperature -60°C to +120°C
• No set-up or maintenance required
• Transverse sensitivity less than 5%

Applications

• Fans and blowers
• Compressors and pumps
• Centrifuges and separators
• Turbines and generators
• Motors and gearboxes
• Any rotating machine requiring continuous vibration surveillance

Specifications

Continuous vibration monitoring is one of the most effective ways to protect rotating equipment, and the CEMB TR-27 Vibration Transmitter makes it practical for plants that do not have a full vibration monitoring system. Because the TR-27 outputs a standard 4-20mA signal, it can be connected to any existing analog input on a PLC or DCS, providing vibration trend data alongside other process variables.

Machinery protection begins with reliable measurement, and the CEMB TR-27 Vibration Transmitter provides it in a compact loop-powered package; Seven Star LLC supplies the CEMB TR-27 Vibration Transmitter with calibration documentation for your condition monitoring programme.

The CEMB TR-27 vibration transmitter provides the 4-20 mA output for the vibration velocity of the machine, and the CEMB TR-27 vibration transmitter covers the standard monitoring range of the fans and the pumps.

Why Seven Star LLC

Seven Star LLC supplies the CEMB TR-27 vibration transmitter with calibration documentation and configuration guidance, supporting condition monitoring projects across the Gulf. Our engineers assist with selecting the correct measuring range, cable length, and special version for aggressive environments.

As a B2B industrial supplier based in Oman, we provide technical support for CEMB vibration monitoring products throughout the GCC region.

Installation & Configuration

The TR-27 is supplied in pre-configured versions selected at the time of order, so no field programming is required. The integral cable is available in standard PVC shielded form or, for aggressive environments, as ETFE shielded armoured cable with a stainless steel gland, and the transmitter can be supplied with the mounting stud or welded pad option to suit the machine.

Because the loop is two-wire, cable lengths and installation cost are minimised, and the -60°C to +120°C temperature rating covers nearly every industrial application.

Choosing the Correct TR-27 Version

The TR-27 is ordered pre-configured, so the choices made at purchase decide how it will behave in the field. Confirm these points with the machinery engineer before ordering:

• Measured quantity: velocity (the usual choice for general machine condition on fans, pumps and motors) or acceleration, together with the full-scale range that matches the alarm levels in your vibration standard.
• Cable version: standard PVC shielded cable with nickel-plated brass gland, or ETFE shielded armoured cable with a stainless steel gland for aggressive, wet or chemical areas.
• Cable length and mounting: the integral cable length required to reach the junction box, and the mounting thread, stud or welded pad arrangement for the bearing housing.

Installation and Commissioning

Mount the transmitter on a rigid, flat part of the bearing housing, as close as possible to the bearing and in the direction of the vibration you want to monitor, usually radial. Avoid thin covers and guards, which resonate and give false readings. Tighten the stud to a firm, flush contact, route the cable away from power conductors, and ground the shield at one end only. At commissioning, check the loop current with the machine stopped and then running. Compare the running value with a portable vibration meter, and set the PLC or DCS alarm and trip levels from the agreed standard.

Troubleshooting Tips

• A loop current at or below 4 mA with the machine running usually indicates a wiring or supply problem rather than a smooth machine.
• Erratic readings are often caused by a loose mounting, a damaged cable or a shield grounded at both ends.
• A sudden, lasting step change in the trend should be checked against the machine’s condition, such as its bearings, alignment and balance, before the transmitter is suspected.

Use in Oman and GCC Plants

In desalination plants, water pumping stations, oil and gas facilities and HVAC systems across Oman and the GCC, many rotating machines have no dedicated protection system. The CEMB TR-27 vibration transmitter lets these assets report vibration directly into the existing control system. The -60°C to +120°C rating and IP68 construction also suit hot, dusty and humid coastal sites.

Supply from Seven Star LLC

Seven Star LLC supplies CEMB vibration transmitters for new projects and replacements. Send the machine type, required measurement, range and cable length, and we will confirm the correct version with you before ordering.

Request a Quote for “CEMB” VIBRATION TRANSMITTER -TR-27

For the CEMB TR-27 Vibration Transmitter, 4-20mA vibration transmitter or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your measurement range, connection and configuration, and our specialists will respond with a detailed commercial proposal and the official CEMB documentation.

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