MR338
ZapFREE® MRI Safe Fiber Optic Absolute Position Sensor
The MR338 Series ZapFREE® Fiber Optic Absolute Position Sensor is an entirely passive, non-metallic absolute rotary encoder designed for use in Magnetic Resonance Imaging (MRI), nanomagenetic detection, EMC test labs, and similar applications where immunity and transparency to electromagnetic fields is required.
The MR330 system measures absolute angular position from 0° to 360° with 0.025° (14-bit) resolution and can track turns up to 4096 counts (12 bits). The remote MR330 Controller Module features multiple built-in interface for compatibility with industry standard motor drives, PLCs, and motion control systems.
Specifications
| Measurement Parameters | |
| Measurement Range | 0° to 360° (continuous) |
| Resolution | 13 bits (8192 counts), 14 bits (13,950 counts, 0.025°) |
| Maximum RPM | Maximum 2,500 rpm for position reading; Mechanical limit is 6,500 rpm |
| Mechanical Performance | |
| Moment of Inertia | 2.17E-06 kg*m2 |
| Starting Torque | 3.58E-04 N*m with Shaft Seal |
| Max Shaft Loads | Axial 30 N (6.75 lbf), Radial 60 N (13.5 lbf) |
| System MTBF (ISO Method) |
L10 bearing life at 100% of max radial/axial load at 2500 rpm: 5.68E+05 hours L10 bearing life at 10% of max radial/axial load at 2500 rpm: 1.22E+06 hours |
| MR Attributes | ACR Guidance Document for Safe MR Practices |
| MRI Useage Zones | MR338 sensor is designed for safe use in all MR Zones I-IV |
| Materials Used | Non-metallic except for fiber optic connector end |
| Explosive Atmospheres | Inherently Safe, Simple Mechanical Device |
| EX Classification | Inherently safe, simple mechanical device when used with MR330 Controller IECEx Test Report (IECExTR) GB/CML/ExTR 16.0070/00 |
| ATEX | EPL Mb/Gb/Gc/Db/Dc |
| IEC Ex | EPL Mb/Gb/Gc/Db/Dc |
| NEC | Exempt |
| Environmental Performance | |
| Temperature/Humidity | Operating: -20° C to +65° C, Storage: -20° C to +65° C, 0%-95% RH (non-condensing) |
| Ingress Protection |
Y Shaft Seal Option = IP65 N Shaft Shield Only Option = IP40 |
| Physical Attributes | |
| Housing Dimension | Ø 58mm x 80mm L (industry standard 58mm servo mount housing) |
Specifications subject to change without notice
Features
- 100% passive sensing design – no electronics whatsoever
- MRI safe and Non-Metallic for use in MRI bore
- Absolute 14-bit single-turn resolution
- Immune to EMI and RFI for safe use in and around medical equipment and “noisy” industrial environments
- Industry standard Size 58mm OD housing
Downloads
MR338 Datasheet
MR338 Drawing
MR338 CAD Files (ZIP)
TO ORDER
Call +1-805-389-6600 or email sales@micronor.com
