IRD544M - Vibration Sensor, Inductive Velocity, Top Exit, MIL 2-Pin, 42.52 mV/mm/s, 25 Hz - 1 kHz
IRD544M is an inductive velocity vibration sensor for on-line machinery protection. Designed in 1955 and still in production, it needs no power supply, gives a high 42.52 mV/mm/s output with low impedance, and works up to 260 °C, making it ideal for turbine steam ends and generator bearings.
The hard-anodised aluminium housing is IP65 and suitable for Class 1, Division 2 hazardous areas. The signal is insulated from the case to eliminate false alarms from ground loops and power surges. Each sensor is calibrated to traceable national standards and supplied with a full frequency calibration certificate.
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Price shown is Ex-Works Thane; shipping and taxes are added at checkout. Buying from outside India? Email sales@irdmech.com for a quote in your currency. Lead time is available on request via Request a Quote. Warranty: 3 years.
Designed in 1955, still the benchmark
The IRD544M design dates back to 1955 and has been in continuous production ever since, making it one of the most widely used velocity sensors in the world. Because the design is proven and stable, it will never become obsolete: an IRD544M installed today is a direct replacement for one installed decades ago. It generates its own signal, so it needs no power supply, and pairs directly with the IRD7100 Machinery Protection Transmitter.
Specifications
| Technical performance | |
|---|---|
| Sensor type | Inductive (moving-coil) velocity, self-generating, no power needed |
| Sensitivity | 42.52 mV/mm/s ±10% (1080 mV/in/s ±10%) |
| Frequency response | 25 to 1,000 Hz |
| Impedance | R = 2 kΩ, L = 0.7 H at 21 °C |
| Maximum amplitude | 3,175 µm (125 mils) pk-pk up to 70 Hz; 30 g above 70 Hz |
| Transverse response | Less than 5% (average) |
| Isolation | Signal insulated from case |
| Mounting and connection | |
| Orientation | Any (horizontal and vertical preferred) |
| Mounting | 4 holes, Ø7.0 mm on 50.8 × 50.8 mm centres (mounting pads available as an optional accessory) |
| Grounding | Case and signal ground isolated |
| Connector | 2-pin MIL-spec, top exit |
| Cable length | 1 to 1,000 m without a repeater |
| Environmental | |
| Operating temperature | −40 °C to 260 °C |
| Ingress protection | IP65 (waterproof, dustproof) |
| Hazardous area | Class 1, Division 2 |
| Weight and dimensions | |
| Weight | 700 g |
| Dimensions | Base 63.0 × 63.0 mm; height 130.0 mm overall (123 mm body incl. 16 mm base, excl. connector) |
| Construction | Aluminium, hard anodised |
| Calibration | Traceable to national standards; full frequency calibration certificate supplied |
| Warranty | 3 years |
Frequently asked questions
Does the IRD544M need a power supply?
No. It is a self-generating inductive sensor, so it needs no excitation or power.
Which monitor or transmitter should I use with it?
It is designed to work with the IRD7100 Machinery Protection Transmitter, which gives 4-20 mA outputs and alarm relays.
What is the maximum temperature?
260 °C, so it suits turbine steam ends and other hot bearing housings.
Can it be used in hazardous areas?
Yes, in Class 1, Division 2 areas.
How long can the cable be?
From 1 m up to 1,000 m, without a repeater.
Is it calibrated?
Yes. Every sensor is calibrated to traceable national standards and ships with a full frequency calibration certificate.
What is the lead time?
Lead time is available on request. Use Request a Quote or email sales@irdmech.com.
What warranty do I get?
3 years. Repairs, replacement or recalibration during the warranty period are free of charge; the sensor must be sent to our works in Thane.
Repairs and calibration
Already own an IRD544M that needs repair or recalibration? Raise a request on our Repairs and Calibration page and our service team will get back to you.