Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
Optimized for hazardous and demanding industrial environments, the Bently Nevada 21000-28-05-00-067-04-02 is a heavy-duty proximity probe housing designed to protect critical vibration monitoring sensors. As part of the 21000 Series, this rugged assembly simplifies transducer installation and adjustment, allowing external access to proximity probes on rotating machinery. The integration of a 3300 XL 8 mm probe with multi-approval certifications ensures highly reliable eddy current displacement measurements in petrochemical, power generation, and gas processing facilities.
| Specification Parameter | Value / Configuration Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model Series | 21000 Series Proximity Probe Housing |
| Full Part Number | 21000-28-05-00-067-04-02 |
| Probe Option (28) | 3300 XL 8 mm probe with coaxial connector, multiple global approvals |
| Probe Cable Length (05) | 0.5 meter (20 inches) |
| Standoff Adapter Option (00) | No standoff adapter installed |
| Probe Penetration Depth (067) | 6.7 inches |
| Fittings Option (04) | One 3/4-14 NPT plug only |
| Mounting Thread Option (02) | 3/4-14 NPT |
| Housing Material | Anodized aluminum main body with 304 stainless steel sleeve |
| Shipping Weight (Calculated) | 2.0 kg (4.4 lbs) |
In modern system standardizations, this specific model (option code 28 for the 3300 XL 8 mm probe with multiple approvals) can be replaced or retrofitted with version 21000-16-05-00-067-04-02 depending on facility-specific regulatory requirements. Always check whether your local installation codes mandate regional approvals (ATEX/IECEx, CSA, or NEPSI) or if the multi-approval package on the option 28 configuration is required to maintain the area classification of your machinery skid.
Since this assembly uses the 00 standoff adapter option, the physical probe penetration depth is locked at 6.7 inches. Engineers must verify the structural distance between the outer mounting surface and the target shaft surface prior to installation. Failing to account for this fixed length can cause the probe tip to physically strike the rotating shaft during machine start-up, resulting in catastrophic failure of the transducer tip and potential damage to the shaft journal.
During initial gap calibration, avoid twisting the 0.5-meter internal probe cable when threading the housing body. It is highly recommended to uncouple the coaxial connector from the extension cable before rotating the housing assembly. Use a high-quality thread sealant on the 3/4-14 NPT mounting threads to prevent oil mist migration and maintain IP66/NEMA 4X environmental ratings.
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Returns & Warranty

Optimized for hazardous and demanding industrial environments, the Bently Nevada 21000-28-05-00-067-04-02 is a heavy-duty proximity probe housing designed to protect critical vibration monitoring sensors. As part of the 21000 Series, this rugged assembly simplifies transducer installation and adjustment, allowing external access to proximity probes on rotating machinery. The integration of a 3300 XL 8 mm probe with multi-approval certifications ensures highly reliable eddy current displacement measurements in petrochemical, power generation, and gas processing facilities.
| Specification Parameter | Value / Configuration Details |
|---|---|
| Manufacturer | Bently Nevada |
| Model Series | 21000 Series Proximity Probe Housing |
| Full Part Number | 21000-28-05-00-067-04-02 |
| Probe Option (28) | 3300 XL 8 mm probe with coaxial connector, multiple global approvals |
| Probe Cable Length (05) | 0.5 meter (20 inches) |
| Standoff Adapter Option (00) | No standoff adapter installed |
| Probe Penetration Depth (067) | 6.7 inches |
| Fittings Option (04) | One 3/4-14 NPT plug only |
| Mounting Thread Option (02) | 3/4-14 NPT |
| Housing Material | Anodized aluminum main body with 304 stainless steel sleeve |
| Shipping Weight (Calculated) | 2.0 kg (4.4 lbs) |
In modern system standardizations, this specific model (option code 28 for the 3300 XL 8 mm probe with multiple approvals) can be replaced or retrofitted with version 21000-16-05-00-067-04-02 depending on facility-specific regulatory requirements. Always check whether your local installation codes mandate regional approvals (ATEX/IECEx, CSA, or NEPSI) or if the multi-approval package on the option 28 configuration is required to maintain the area classification of your machinery skid.
Since this assembly uses the 00 standoff adapter option, the physical probe penetration depth is locked at 6.7 inches. Engineers must verify the structural distance between the outer mounting surface and the target shaft surface prior to installation. Failing to account for this fixed length can cause the probe tip to physically strike the rotating shaft during machine start-up, resulting in catastrophic failure of the transducer tip and potential damage to the shaft journal.
During initial gap calibration, avoid twisting the 0.5-meter internal probe cable when threading the housing body. It is highly recommended to uncouple the coaxial connector from the extension cable before rotating the housing assembly. Use a high-quality thread sealant on the 3/4-14 NPT mounting threads to prevent oil mist migration and maintain IP66/NEMA 4X environmental ratings.
Global Express Shipping
Returns & Warranty
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| Country of origin |
United States
|