The 24701-28-05-00-025-04-02 is a Bently Nevada 303 stainless steel probe housing assembly featuring a factory-integrated 3300 XL 8mm proximity probe with selectable hazardous area approvals. Engineered with a 2.5-inch probe penetration and no standoff adapter, this CSA-certified explosion-proof housing delivers direct, space-efficient external mounting on thick-walled machinery casings where internal probe installation is impractical, providing reliable shaft vibration and position monitoring in harsh industrial environments.
Environment and certification
• CSA Certified: Approved by Canadian Standards Association for hazardous area installations.
• Explosion Proof: Rated for use in explosive environments with intrinsically safe applications.
• CSA Type 4 Enclosure: Provides protection against dust, water, and harsh industrial conditions.
• API 670 Compliant: Fully meets American Petroleum Institute standard for externally mounted probe housings.
• Stainless Steel Construction: Durable 24701 housing material for corrosion resistance and longevity.
• Hazardous Area Approved: Suitable for intrinsically safe applications in dangerous environments.
Specific Application
- External shaft vibration and axial position monitoring on critical rotating machinery (e.g., steam turbines, centrifugal compressors, multistage pumps) where internal probe mounting is not feasible
- Installations requiring direct probe mounting without a standoff adapter in space-constrained environments
- Hazardous area applications requiring CSA-certified explosion-proof enclosures (Class I, Divisions 1 & 2, Groups C and D)
- Machinery with thick casings where the 2.5-inch penetration depth provides optimal target proximity
Ordering Information Table – 24701-28-05-00-025-04-02
|
Position |
Code |
Description |
|
Series |
24701 |
303 stainless steel probe housing assembly with 304 stainless steel sleeve |
|
A: Probe with Connector |
28 |
3300 XL 8mm probe with selectable hazardous area approvals |
|
B: Probe Cable Length |
05 |
0.5 meter (20 inches) |
|
C: Standoff Adapter |
00 |
No standoff adapter |
|
D: Probe Penetration |
025 |
2.5 inches (63.5 mm) |
|
E: Fittings |
04 |
One 3/4-14 NPT plug only |
|
F: Mounting Thread |
02 |
3/4-14 NPT |
FAQ
Q1: What is the Bently Nevada 24701-28-05-00-025-04-02?
A1: It is a stainless steel probe housing assembly for 3300 XL series 8mm proximity probes with hazardous area approvals.
Q2: What certifications does this housing assembly have?
A2: It has CSA approval as explosion-proof for hazardous areas and is certified as a CSA Type 4 enclosure.
Q3: What industry standard does this housing comply with?
A3: It is fully compliant with the American Petroleum Institute's API 670 Standard for externally mounted probe housings.
Q4: What are the key specifications of this model?
A4: It features a 3300 XL 8mm probe with approval option, 0.5m cable, no standoff adapter, 2.5in probe penetration, and one 3/4-14 NPT plug.
Q5: What support is available for longer sleeve installations?
A5: For sleeves over 304mm, Bently Nevada offers probe support and oil seal (part 37948-01) and custom sleeve supports.
Accessories
| Part Number | Description |
| 37948-01 | Probe Support / Oil Seal Recommended for sleeves longer than 305 mm (12 in) |
Individual Probe Sleeve for 21000/24701 Proximity Probe Housings
44382-AAA
| A: Measured Probe Sleeve Length | |
|
Recommendation Order in increments of 0.1 in (3 mm) |
|
The individual probe sleeve length does not include the distance from the end of the sleeve to the probe tip or the gap from the probe tip to the target material. If only the part number of the original housing is known, and the sleeve cannot be measured, use the following table to determine the sleeve length:
| AAA | Description |
|
Standoff adapter option from original housing (21000, CA21000, 24701, or CA24701 option C) plus Probe penetration option from original housing (21000, CA21000, 24701, or CA24701 option D) and 045 |
All housing AAA options except NSv and 11mm probes (options other than A:06, A:12, A:26, A:27, A:29, A:30, A:31, A:32, A:35, or A:36) |
|
Example Original part number 21000-16-10-15-035-03-02 AAA option for replacement sleeve (015 + 035 + 045) = 095 |
|
|
Standoff Adapter Option from original housing (21000, CA21000, 24701, or CA24701 option C) plus Probe penetration option from original housing (21000, CA21000, 24701, or CA24701 option D) and 046 |
Housing AAA options for 3300 NSv probe options (A:26, A:27, A:31, or A:32 |
|
Example Original part number 24701-31-10-15-090-03-02 AAA option for replacement sleeve (015 + 090+ 046) = 151 |
|
|
Standoff Adapter Option from original housing (21000, CA21000, 24701, or CA24701 option C) plus Probe penetration option from original housing (21000, CA21000, 24701, or CA24701 option D) and 037 |
Housing AAA options for 3300 XL 11mm probe options (A:29, A:30, A:35, or A:36) |
|
Example Original part number CA24701 -36-10-40-053- 02-02 AAA option for replacement sleeve (040 + 053+ 037) = 130 |
|
|
Standoff Adapter Option from original housing (21000, CA21000, 24701, or CA24701 option C) plus Probe penetration option from original housing (21000, CA21000, 24701, or CA24701 option D) and 039 |
Housing AAA options for 7200 Series 11mm probe options (A:06 or A:12) |
|
Example Original part number CA24701 -12-10-30-113-01 - 02 AAA option for replacement sleeve (030 + 113+ 039) = 182 |
|
| Minimum Probe Sleeve Length | |
| For all probes except NSv and 11mm probes | 5.5 in (140 mm) = 055 |
| 3300 XL NSv probe | 5.5 in (142 mm) = 056 |
| 3300 XL 11mm probe | 4.7 in (119 mm) = 047 |
| Maximum Probe Sleeve Length | |
| All 0.5 meter probes except NSv and 11mm probes | 18.0 in (457 mm) = 180 |
| 3300 XL NSv 0.5 meter probe | 18.1 in (460 mm) = 181 |
| 7200-series 0.5 meter 11mm probe | 15.4 in (391 mm) = 154 |
| All 1.0 meter probes except NSv and 11mm probes | 33.7 in (856 mm) = 337 |
| 3300 XL NSv 1.0 meter probe | 33.8 in (859 mm) = 338 |
| 3300 XL 1.0 meter 11mm probe | 32.9 in (836 mm) = 329 |
| 7200 Series 1.0 meter 11mm probe | 33.1 in (841 mm) = 331 |
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