Brand: Shinkawa

SHINKAWA VM-5S Dual Tachometer

Name: Shinkawa VM-5S Dual Tachometer – Datasheet & Price Quote
Brand: Shinkawa

Description

Overview

The Shinkawa VM-5S Dual Tachometer is a two-channel speed monitoring module within the VM-5 series machinery protection system. It measures the rotational speed of rotating machinery such as steam and gas turbines, compressors, and pumps, providing continuous speed indication plus alarm and trip functions through dedicated relay outputs.

Engineered for turbine supervisory instrumentation (TSI), the VM-5S accepts input signals from VK, RD, FK, VE, MS, and VC series speed transducers and delivers highly accurate speed measurement up to 99,999 rpm depending on the selected range and transducer configuration.

Engineering & Design

The module is built to the VM-5 series rack-mount standard, occupying a single slot in the VM-5H4 or VM-5W2 instrument rack. Monitor ranges are selectable from 1 to 1,000 rpm up to 99,999 rpm, covering low-speed turning gear applications through high-speed turbomachinery.

Each channel provides a recorder output in 4-20mA DC or 1-5V DC form, and the relay stage supplies speed alarm and danger contacts with selectable individual, OR, or AND logic. Speed relay settings are adjusted with hysteresis control on a shaped waveform circuit, and the module supports the VM-5 series self-diagnostic architecture.

Key Features

Two independent speed measurement channels
Monitor ranges from 1,000 rpm up to 99,999 rpm
Accepts VK, RD, FK, VE, MS, and VC series transducers
Recorder output selectable as 4-20mA DC or 1-5V DC
Speed alarm and danger relays with individual, OR, and AND logic
Hysteresis adjustment with shaped waveform circuit
Wire-break detection support via RD or FK driver transducers
Zero speed monitoring capability for turning gear applications
VM-5 series rack integration with self-diagnostics

Applications

Steam and gas turbine speed monitoring
Compressor and blower rotational speed surveillance
Pump and motor speed protection
Zero speed and turning gear monitoring
Overspeed alarm and trip functions
Integrated turbine supervisory instrumentation (TSI) systems

Specifications

Specification	Value
Model	VM-5S Dual Tachometer
Monitor Range	1 to 1,000 rpm… to 99,999 rpm (selectable)
Input Signal	VK, RD, FK, VE, MS, VC series transducers
Recorder Output	4-20mA DC or 1-5V DC
Relay Output	Speed alarm and danger contacts (SR1-SR4)
Relay Logic	Individual, OR, or AND output modes
System	VM-5 series monitor rack (VM-5H4 / VM-5W2)
Operating Temperature	0 to 65°C
Storage Temperature	-30 to +85°C

Accurate speed measurement is fundamental to turbine protection, and the Shinkawa VM-5S Dual Tachometer provides the measurement integrity required for overspeed and zero-speed monitoring functions. The VM-5S is engineered to work with the complete VM-5 series rack, allowing speed channels to be combined with vibration, temperature, and phase modules in a single machinery protection system.

Speed protection is a core function of any machinery protection system, and the Shinkawa VM-5S Dual Tachometer delivers it dependably, which is why Seven Star LLC recommends the Shinkawa VM-5S Dual Tachometer for VM-5 racks protecting critical turbomachinery.

The Shinkawa VM-5S dual tachometer measures the shaft speed from the two pickups, and the Shinkawa VM-5S dual tachometer module covers the dual channel speed monitoring of the machine.

Why Seven Star LLC

Seven Star LLC supplies the Shinkawa VM-5S Dual Tachometer for machinery protection projects in the Gulf region, backed by our experience with VM-5 series systems and turbine supervisory instrumentation. We provide the module with full documentation and configuration guidance for your rack and transducer arrangement.

Our team supports spare module identification, system expansion, and replacement programmes for existing VM-5 installations across oil and gas, power, and industrial plants.

Measurement Integrity

The shaped waveform circuit of the VM-5S delivers clean, hysteresis-controlled switching of speed relay settings, eliminating chatter at the set point and providing dependable alarm and trip outputs. Selection of individual, OR, or AND relay logic lets the protection engineer match the module behaviour to the machine’s protection philosophy.

Support for wire-break detection with RD or FK driver transducers ensures that a faulty sensor or cable is reported immediately rather than silently degrading speed protection.

Request a Quote for SHINKAWA VM-5S Dual Tachometer

For the Shinkawa VM-5S Dual Tachometer, VM-5 series tachometer 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 Shinkawa documentation.

Identifying a VM-5S Replacement

VM-5 modules are ordered with option codes that set the range, outputs and other functions, so the model code on the installed module matters as much as the base type. Before ordering, record the full model and suffix code from the module label, the monitor range set on the existing unit, and the type of speed pickup in the field (VK, RD, FK, VE, MS or VC series). Also note the rack model (VM-5H4 or VM-5W2) and the slot the module sits in. With these details the replacement can be matched and set up to behave like the original.

Installation and Commissioning

Swapping a speed monitor on a running machine can affect overspeed protection, so plan the job with operations and follow your site’s bypass and permit procedures. Before removing the old module, write down its alarm and danger setpoints, the relay logic (individual, OR or AND) and the recorder output type. After installation:

check the pickup gap and wiring, and confirm the input signal level at the module;
simulate speed with a signal generator to check the display, the 4–20 mA or 1–5 V output, and each relay setpoint;
confirm the DCS or TSI display scaling matches the module range;
test wire-break detection where RD or FK driver transducers are used.

Maintenance and Troubleshooting

Frequent Causes of Speed Faults

Zero or erratic reading at speed: check the pickup gap, the target gear or keyway condition, and cable shielding.
Reading at double or half the true speed: check the number of gear teeth or pulses per revolution set for the channel.
Relays chattering near setpoint: review the hysteresis setting against normal speed fluctuation.

Keep proof-test records of the overspeed trip function according to your site’s safety procedures, and include the VM-5S settings in your configuration backup.

Applications in Oman and the GCC

VM-5 racks are found on steam turbines, gas compressors and large pumps in the region’s power, desalination and oil and gas plants. Zero-speed monitoring is especially useful for turning gear on large steam turbines after shutdown.

Sourcing Through Seven Star LLC

Send Seven Star LLC the full model code and rack details, and we will confirm the correct module and reply with a quotation and lead time.

Other Models in the Shinkawa VM-5 Machinery Monitoring System Range

Seven Star LLC supplies models from the Shinkawa VM-5 Machinery Monitoring System range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.

Model	Category
Shinkawa VM-5W1 Dual Power Instrumentation Rack	Vibration Monitoring	View details
SHINKAWA VM-5Z1/IS0 Power Supply	Vibration Monitoring	View details
SHINKAWA VM-5K-411512-000-000-111-0/IS0/EX5 Dual Vibration Monitor	Vibration Monitoring	View details
SHINKAWA VM-5T-93012-000-000-111-0/IS0/EX5 Thrust Position Module	Vibration Monitoring	View details
SHINKAWA VM-5F-312-000-000-111-00/IS0/EX5 Temperature Monitor	Vibration Monitoring	View details
SHINKAWA VM-5S Dual Tachometer	Vibration Monitoring	You are viewing this model
SHINKAWA VM-5P3-1-00-00-0/IS0 Phase Marker Module	Vibration Monitoring	View details
SHINKAWA VM-5Y1-02/IS0 Relay Module	Vibration Monitoring	View details
SHINKAWA VM-5Y7-01/IS0 Relay Module	Vibration Monitoring	View details

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About brand

Turbine and compressor trains in many Asian-built power and process plants are protected by Shinkawa vibration monitoring. Shinkawa Electric Co., Ltd. of Tokyo makes eddy current displacement transducers, vibration sensors and rack-based monitors for rotating machinery. Seven Star LLC lists Shinkawa VM-5 and VM-700 series monitor modules, sensors and converters, and sources them by full model code for machinery protection systems in Oman.

Shinkawa company profile

Roots	1927. Incorporated as Shinkawa Electric Co., Ltd. in 1951
Head office	Chiyoda, Tokyo, Japan
Sensors	Displacement and vibration transducers made since 1977. Development and manufacture are at Shinkawa Sensor Technology (founded 1994) in Hiroshima
Product families	Eddy current proximity probes with drivers (converters), velocity and acceleration sensors, LVDTs, and machinery protection monitors and condition monitoring systems
Typical machines	Steam and gas turbines, generators, centrifugal compressors, large pumps and fans

Milestones

1927: The business that became Shinkawa starts in Japan.
1951: Incorporated as Shinkawa Electric Co., Ltd.
1977: Displacement and vibration transducers are first made.
1994: Shinkawa Sensor Technology is founded in Hiroshima for sensor development and manufacture.

Shinkawa monitors and sensors listed

Series	Function	Listed models
VM-5 rack	Machinery protection monitor system	VM-5K dual vibration, VM-5T thrust position, VM-5S tachometer, VM-5F temperature, VM-5P3 phase marker
VM-5 system modules	Relays, power, rack and communication	VM-5Y1 and VM-5Y7 relays, VM-5Z1 power supply, VM-5W1 rack, VM-53 communication
VM-700 series	Compact stand-alone vibration monitors	VM-701B, VM-704B, VM-741B, VM-751B1
VK series (VL model codes)	Eddy current displacement sensors	VL-202A08R, VL-452A11A
Converters	Probe drivers and signal converters	2M04-500

Shinkawa's current catalog also shows the FK transducer series and the VM-7 monitor. This matters when an older part has to be matched with a present-day equivalent.

How a Shinkawa protection chain works

An eddy current probe sits a set distance from the shaft. Its driver (converter) turns the gap into a voltage, and the monitor turns that voltage into vibration, thrust position or speed values with alert and danger set points. The probe, extension cable and driver are calibrated together for one total system length and one target material, usually AISI 4140 shaft steel. Changing one part without matching the other two shifts the calibration. The monitor relays feed the turbine or compressor trip logic, and buffered outputs go to analysis systems. Many protection systems of this kind are specified to API 670.

Where Shinkawa vibration monitoring is used

Shinkawa systems measure shaft vibration, axial (thrust) position, speed, phase reference and bearing temperature on steam turbines, gas turbines, generators, compressors, pumps and fans. In the GCC they are found mainly in power stations, desalination plants, refineries and petrochemical units with Japanese or Korean machinery packages.

Ordering Shinkawa parts: what we need

Shinkawa model codes are long and every field counts. A monitor code such as VM-5K-411512-000-000-111-0/IS0/EX5 defines the input type, range, options and suffix codes, so copy the complete string from the module label, including everything after the slashes. For sensors, send the VL or FK model code, probe tip diameter, cable length and the matching driver or converter model, since the probe, extension cable and driver work as a calibrated set. A serial number and a photo of the label help us confirm the item in the manufacturer's documentation. Where a model is no longer produced, we propose the successor the manufacturer names.

Facts checked against Shinkawa Electric company information and product documentation, October 2026.

Browse Shinkawa products by category: Vibration.

FAQ

Questions about the SHINKAWA VM-5S Dual Tachometer

Answers from our engineering team on installation, compatibility and integration.

01What is the VM-5S used for?

The VM-5S is a dual tachometer for the VM-5 series that measures rotational speed of turbines, compressors, pumps, and other rotating machinery with alarm and trip relay outputs.

02Which speed ranges are available?

Monitor ranges are selectable from 1 to 1,000 rpm through 99,999 rpm, covering low-speed turning gear to high-speed turbomachinery.

03Which transducers can be connected?

The module accepts VK, RD, FK, VE, MS, and VC series Shinkawa speed transducers.

04What outputs does the module provide?

Each channel provides a 4-20mA DC or 1-5V DC recorder output plus speed alarm and danger relay contacts with selectable logic.

05Can it be used as a zero speed monitor?

Yes, with an RD or FK driver transducer the VM-5S supports zero speed monitoring, which is strongly recommended for safety-critical turning gear applications.