24701-28-10-00-040-00-02 is a Bently Nevada mechanical protection application module featuring a rugged 303 stainless steel housing body and a 3300 XL 8mm reverse mount probe. Fully compatible with standard 3/4-14 NPT conduit lines, this unit works seamlessly with industrial machinery casings to deliver flexible external sensor mounting, explosion-proof hazardous area shielding, and stable industrial transducer communication.
Applications
Used for external mounting of proximity probes on rotating machinery such as turbines, compressors, and pumps.
Suitable for hazardous areas requiring explosion-proof and CSA-certified equipment.
Applied in oil & gas, petrochemical, and power generation industries for vibration and position monitoring.
Ideal for installations requiring robust stainless steel protection in harsh or corrosive environments.
Competitive Advantage
Stainless steel construction: Provides superior corrosion resistance and durability for harsh and aggressive industrial environments.
Explosion-proof certified: CSA Type 4 rated and suitable for hazardous areas, ensuring safe operation in critical applications.
API 670 compliant: Fully meets industry standards for externally mounted proximity probe housings, supporting reliable system integration.
Flexible installation design: Includes threaded ports, optional fittings, and adjustable sleeve options for versatile mounting configurations.
Ordering Information
|
Option Code |
Parameter Block Description |
Configured Value Specification |
|
24701 |
Housing Model Base |
Stainless Steel Proximity Probe Housing Assembly |
|
-28 |
Option A: Probe with Connector |
3300 XL 8mm probe, selectable hazardous area approvals |
|
-10 |
Option B: Probe Cable Length |
1.0 meter (39 inches) integrated FEP lead length |
|
-00 |
Option C: Standoff Adapter Length |
No standoff adapter configuration (Minimum 1.5 in if used) |
|
-040 |
Option D: Probe Penetration |
4.0 inches overall sleeve penetration length envelope |
|
-00 |
Option E: Conduit Fittings |
Without separate conduit fittings (Includes ports only) |
|
-02 |
Option F: Mechanical Mounting Thread |
3/4-14 NPT thread profile (Required for standoff clearance) |
Installation & Troubleshooting FAQ
Q1: What mechanical safeguards must be implemented if the probe sleeve length parameters extend past 12 inches?
A: When your combined standoff adapter height and probe penetration depth lengths drop into a total calculation greater than 304 mm (12 inches), the internal stainless steel sleeve becomes vulnerable to critical structural resonance. To resolve this issue and protect your signal, you must add an intermediate physical sleeve support or install a specialized Bently Nevada 37948-01 probe support and oil seal inside the machine casing interface.
Q2: Why is the signal circuit failing or displaying low insulation values at low temperatures below -34°C?
A: Exposing the internal reverse-mount proximity probe to extreme temperatures below -34°C (-30°F) alters the structural flexibility of its Viton O-ring, causing a premature failure of the pressure seal mechanism. Keep ambient workspace criteria within the rated -51°C to +177°C boundary, and ensure the protective dome cover is torqued down firmly against its body seal to lock out bitter cold drafts.
Q3: How do I adjust the probe penetration depth to fine-tune the calibration gap without unthreading the outer body?
A: The physical design provides a localized structural tracking adjustment range of ±13 mm (±0.5 inches) directly via the integrated reverse-mount assembly sleeve interface. Loosen the sleeve locknut, rotate the internal sleeve until your digital multimeter tracking outputs indicate the correct -10.0 VDC API calibration gap midpoint voltage, and lock down the hardware to eliminate vibration tracking slip.
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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