MR348
MRI-Compatible Fiber Optic Incremental Encoder
The MR348 series ZapFree® Fiber Optic Incremental Sensor is an entirely passive, non-metallic incremental rotary encoder designed for use in Magnetic Resonance Imaging (MRI), functional MRI (fMRI), nanomagnetic detection, EMC test labs, and similar applications where immunity and transparency to electromagnetic fields is required. The passive, all-optical sensor connects to the remote controller via a standard duplex 62.5/125 multimode optical fiber link.
The remote MR340 Controller Module transmits and converts optical signals to/from the sensor, outside the MRI zone. The controller’s multiple built-in interfaces insure compatibility with industry standard motor drives, PLCs, quadrature counters and motion control systems.
Features
- 100% passive sensing design – no electronics whatsoever
- Non-metallic for safe use in MRI Zone
- Immune and transparent to electromagnetic fields – does not leave artifacts in MRI scans
- Immune to lightning and high voltages
- Sensor can be installed in all manner of hazardous and potentially explosive atmospheres – mines, gas and dust
- Outdistances copper, link lengths to 2000 meters
- Compatible MR340-1 DIN Rail Mount Controller
Specifications
| Measurement Parameters | |
| Resolution | 360ppr (Contact Micronor for special requirements) |
| Max Speed | 6000 RPM (Contact Micronor for special requirements) |
| Mechanical Parameters | |
| Rotor Moment of Inertia | 5.455E-7 kg*m2 |
| Starting Torque | 1.93E-4 N*m |
| Max Shaft Loads | Radial = 60 N (13.5 lbf), Axial = 30 N (6.75 lbf) |
| System MTBF |
L10 bearing life calculated at 50% of max. radial and axial load at 1000 RPM: 3.01E+06 hours (343.2 years) |
| Optical Interface | |
| Optical Interface | LC Duplex, 62.5/125μm Graded Index Fiber, 0.275NA, Type OM1 |
| Link Length | Up to 2000 meters (3280 ft) with MR340 Controller |
| MR Attributes | ACR Guidance Document for Safe MR Practices |
| MRI Useage Zones | MR348 sensor is designed for safe use in all MR Zones I-IV |
| Materials | Non-metallic except for fiber optic connector end, ceramic bearings, polycarbonate shaft |
| Explosive Atmospheres | Inherently Safe, Simple Mechanical Device |
| EX Classification | Inherently safe, simple mechanical device when used with MR320 Controller |
| ATEX | EPL Mb/Gb/Gc/Db/Dc |
| IEC Ex | EPL Mb/Gb/Gc/Db/Dc |
| Environmental Attributes | |
| Temperature/Humidity | +10°C to +35°C, 0%-95% RH (non-condensing) |
| Ingress Protection | IP50 (Contact Micronor for special requirements) |
| Physical Attributes | |
| Housing Dimension | Ø58 mm x 58 mm |
| Unit Weight | 280 g (9.75 oz) |
First fMRi Study using Micronor MRI-Safe Rotary Encoder (Marquette University, 2008)
TO ORDER
Call +1-805-389-6600 or email sales@micronor.com
Ordering Information
| MR348-D06YYY | Where YYY=Optical Interface YYY Options: C05=5m Pigtail , C10=10m Pigtail |
| MR340-1 | DIN Rail Mount Controller |
Quick Ship Configurations
| MR340-1 | DIN Rail Mount Controller |
| MR348-D06C05 | MRI Safe Size 58mm Encoder, 360ppr, Duplex LC Pigtail Length=5m |
| MR348-D06C10 | MRI Safe Size 58mm Encoder, 360ppr, Duplex LC Pigtail Length=10m |
