Key Technical Specifications
| Parameter | Value / Notes |
|---|---|
| Product Model | MWB90-2 |
| Manufacturer Family | GE / Baker Hughes / Krautkrämer-style UT probe |
| Product Type | Ultrasonic angle-beam probe |
| Nominal Angle | 90° |
| Nominal Frequency | 2 MHz |
| Typical Application | Weld inspection, pipe/tube inspection, structural NDT |
| Compatible Equipment | Ultrasonic flaw detectors; verify connector and calibration |
| Connector Type | Not confirmed for MWB90-2; verify OEM label |
| Wedge / Housing Details | Not confirmed; verify physical fit and beam angle |
| Certification / EN Marking | Not confirmed unless marked -EN or documented by OEM |
Product Introduction
In NDT shops, a 90° angle probe like the GE MWB90-2 usually shows up when you need a steep shear-wave beam for specific weld geometries, tight joint access, or unusual inspection angles. It is not a general-purpose “grab-any-probe” part. A 90° beam behaves very differently from a 45°, 60°, or 70° probe, and if the wedge, frequency, or connector is wrong, your A-scan will lie to you before you even realize the setup is bad.The MWB90-2 belongs to the MWB90 ultrasonic angle-beam probe family, commonly referenced under GE, Baker Hughes, and Krautkrämer-style UT probe lineups. Engineers and NDT technicians typically choose it because it fits an existing flaw-detector workflow and provides a defined 90° inspection angle at 2 MHz. That said, I would not buy or install one based only on the model number. The connector, wedge condition, calibration block correlation, and instrument setup all matter.
Quality SOP & Tech Pitfalls
The Lab Report
Before putting an MWB90-2 into service, I would check it like this:
- Visual inspection: Check the probe housing, wedge face, connector pins, cable strain relief, and labeling.
- Part-number verification: Confirm MWB90-2, frequency marking, angle marking, connector type, and any OEM/Baker Hughes/Krautkrämer markings.
- Connector check: Inspect for bent pins, loose shells, corrosion, or damaged Lemo-style connectors if applicable.
- Cable continuity: Check for intermittent opens, especially near the connector boot and probe entry point.
- Flaw-detector test: Connect to a known-good ultrasonic flaw detector and verify stable pulse/echo response.
- Calibration check: Use the correct reference block or calibration standard for the application.
- Wedge inspection: Look for wear, scratches, gouges, or contamination on the wedge contact surface.
- ESD-safe handling: Store in a clean, dry case; protect the connector and wedge face.
The Engineer’s Warning
The biggest mistake with probes like this is assuming “MWB90” means one fixed probe.It does not.
- MWB90-2 is not automatically the same as MWB90-4.
- MWB90-2 is not automatically the same as MWB90-O2.
- A probe with the right model number can still be wrong if the connector, wedge, calibration, or instrument setup does not match.
I have seen inspectors chase ghost indications for hours because someone swapped in a probe with the same family name but different beam behavior. The screen looked alive, the gain came up, and the readings still did not make sense. The problem was not always the instrument. Often it was the probe wedge, connector, or calibration reference.Do not use MWB90-2 for safety-critical weld or pressure-component inspection until you verify it against the applicable procedure, code, and calibration standard.
Installation & Configuration Guide
Pre-Installation
- ⚠️ Confirm the probe is required by the NDT procedure, drawing, or work instruction.
- Verify the instrument is compatible with the probe connector.
- Check the probe label for MWB90-2, frequency, angle, and any OEM markings.
- ⚠️ Photograph the old probe label, connector, cable routing, and instrument setup before removal.
- Record the flaw detector model, probe model, cable type, calibration block, and gain settings.
Removal
- Power down or place the flaw detector in a safe standby state if required by your procedure.
- Disconnect the probe from the instrument carefully.
- Do not pull by the cable.
- Label the probe and cable if multiple probes are in use.
- Inspect the removed probe for wedge wear, cable damage, or connector damage.
Installation
- Match the replacement probe exactly: MWB90-2, 90°, 2 MHz, and correct connector type.
- Inspect the new probe wedge face before connecting.
- Align the connector carefully; do not force it.
- Secure the connection fully.
- Verify the cable is routed so it cannot snag, kink, or pull the connector during scanning.
Power-On & Testing
- Turn on the ultrasonic flaw detector.
- Confirm the instrument recognizes a stable probe signal.
- Perform calibration using the correct reference block or test standard.
- Check beam angle, range, sensitivity, and indication response.
- Run a verification scan on a known reference reflector before inspecting production parts.
- Document the probe serial number, calibration data, and instrument settings.
Compatible Replacement Models
| Compatibility Tier | Model / Approach | Notes |
|---|---|---|
| ✅ Drop-in Replacement | GE / Baker Hughes MWB90-2 | Only if part number, frequency, angle, connector, and wedge match exactly. |
| ⚠️ Procedure-Compatible Alternative | Other MWB90 variants | May require recalibration, procedure review, and connector verification. |
| ❌ Hardware Mod Required | Different probe family or angle | Do not substitute without NDT procedure approval; beam angle and frequency changes affect inspection validity. |
Frequently Asked Questions
Is GE MWB90-2 a 90° ultrasonic probe?
Yes. Based on the MWB90 family naming, MWB90-2 is treated as a 90° ultrasonic angle-beam probe, with the “-2” commonly indicating 2 MHz.Can I use MWB90-4 instead of MWB90-2?
Not automatically. MWB90-4 is typically associated with 4 MHz, while MWB90-2 is associated with 2 MHz. Changing frequency changes penetration, resolution, beam behavior, and calibration.Is MWB90-O2 the same as MWB90-2?
Not necessarily. The “O” designation usually indicates a different interface or orientation variant. Do not assume it is a direct substitute without checking the OEM label and connector.What instruments is MWB90-2 compatible with?
It is intended for use with ultrasonic flaw detectors, but compatibility depends on the connector type, cable, instrument input, and calibration procedure. Verify the exact connector before ordering.Can I use this probe without calibration?
No. For any real inspection work, you need to calibrate the probe and instrument against the correct reference standard. A probe label alone does not make the setup valid.What should I check before buying a replacement MWB90-2?
Check the full model number, frequency marking, angle marking, connector type, cable condition, wedge condition, OEM/Baker Hughes/Krautkrämer markings, and the NDT procedure requirements. A photo of the old probe label is much better than a verbal description.Is this probe safe for weld or pressure-component inspection?
Only if it is approved by the applicable NDT procedure, code, or customer specification. The probe must be verified, calibrated, and documented before use on safety-sensitive components.
