Self-generated signal
Casing motion moves the internal coil and magnet assembly, producing velocity-proportional voltage without a local transducer power supply.
74712Bently Nevada
sensor system
sensor system
Bently Nevada 74712-06-03-04-00 / 74712-06-12-04-04 High-temperature Seismoprobe Velocity Transducers
Two mounting-base executions10 Hz lower limitUp to 204 °C
01
Product Description
The Bently Nevada 74712-06-03-04-00 and 74712-06-12-04-04 are high-temperature, self-generating Seismoprobe velocity transducers for casing-vibration measurement. Both select the 0° ±100° orientation, a 10 Hz minimum operating frequency and a side-mounted connector, while their base and approval fields establish different installation hardware.
A rectangular flange and no agency approval define 74712-06-03-04-00; an isolated circular base with a 1/2-20 UNF-2A mounting thread and CSA, ATEX and IECEx approvals define 74712-06-12-04-04. Each model generates 20 mV/mm/s across the specified load and operates through the same moving-coil mechanism from −29 to +204 °C.
02
Technical Specifications
| Technical Item | 74712-06-03-04-00 | 74712-06-12-04-04 |
|---|---|---|
| Brand | Bently Nevada | Bently Nevada |
| Product Type | High-temperature Seismoprobe velocity transducer | High-temperature Seismoprobe velocity transducer |
| Product Origin | USA | USA |
| Product Family | 74712 high-temperature two-wire transducer | 74712 high-temperature two-wire transducer |
| Mounting Angle | 0° ±100° | 0° ±100° |
| Minimum Operating Frequency | 10 Hz (600 cpm) | 10 Hz (600 cpm) |
| Upper Frequency | 1 kHz (60,000 cpm), +0/−3 dB typical | 1 kHz (60,000 cpm), +0/−3 dB typical |
| Mounting Base | 03 — rectangular flange | 12 — isolated circular base, 1/2-20 UNF-2A |
| Connector | 04 — side mount | 04 — side mount |
| Agency Approval | 00 — no approvals | 04 — CSA, ATEX and IECEx |
| Sensitivity | 20 mV/mm/s (500 mV/in/s), ±5% | 20 mV/mm/s (500 mV/in/s), ±5% |
| Calibration Load | 10 kΩ across pins A and B | 10 kΩ across pins A and B |
| Velocity Range | 25 mm/s (1 in/s) at 100 Hz with 10 kΩ load | 25 mm/s (1 in/s) at 100 Hz with 10 kΩ load |
| Dynamic Displacement Range | 2.54 mm (0.100 in) peak-to-peak maximum | 2.54 mm (0.100 in) peak-to-peak maximum |
| Coil Resistance | 1.25 kΩ ±5% | 1.25 kΩ ±5% |
| Locked-coil Inductance | 125 mH typical | 125 mH typical |
| Operating / Storage Temperature | −29…+204 °C (−20…+400 °F) | −29…+204 °C (−20…+400 °F) |
| Shock Resistance | 50 g peak along non-sensitive axis | 50 g peak along non-sensitive axis |
| Typical Weight | 480 g (17 oz) | 480 g (17 oz) |
03
Performance Comparison — High-temperature Velocity Output
Both 74712 configurations use the same moving-coil measurement path, sensitivity and temperature range; the catalog differences occur at the mounting interface and approval execution.
Ten-hertz response floor
The shared option-06 orientation establishes a 10 Hz lower operating frequency for both complete models.
High-temperature body
The transducer construction supports operation through 204 °C while the external cable and mounting hardware remain separately selected.
04
Installation Comparison — Flanged and Isolated Bases
The base code determines how machine motion enters each sensor and whether electrical isolation is included at the mounting interface.
Rectangular flange
74712-06-03-04-00 bolts to a prepared flat surface through the option-03 rectangular base.
Isolated threaded base
74712-06-12-04-04 uses option 12, an isolated circular base with a 1/2-20 UNF-2A mounting thread.
Approval-linked execution
The isolated option-12 base supports the option-04 CSA, ATEX and IECEx execution of 74712-06-12-04-04.
05
Frequently Asked Questions
Why would 74712-06-03-04-00 be selected instead of 74712-06-12-04-04?
Use the first where the rectangular flange and no-approval execution match the installation; the second changes both the base and approvals.
What isolation does 74712-06-12-04-04 add at the machine interface?
Its option-12 circular base is isolated and uses a 1/2-20 UNF-2A mounting thread.
Why can both 74712-06-03-04-00 and 74712-06-12-04-04 miss slower motion?
Their shared option-06 orientation has a 10 Hz lower operating limit, so slower movement is outside the specified response.
Where does the cable connect on 74712-06-12-04-04?
Code 04 places the connector on the side, requiring lateral plug and strain-relief clearance.
How is reversed polarity checked on 74712-06-03-04-00?
Pin A is positive relative to Pin B when transducer-case velocity moves toward the connector.
What mounting fault affects both 74712-06-03-04-00 and 74712-06-12-04-04?
A loose, flexible or uneven interface prevents casing motion from reaching the sensitive axis correctly.
06
Shipping Services
Export packing, requested carriers and shipment tracking are coordinated around the recorded model, quantity and destination.
Catalog verificationThe full model and suffix stay visible.
Original productsIndustrial components are supplied with traceable identification.
One-year warrantyCoverage remains linked to the order record.
Global deliveryExport packing and tracking are coordinated.
07
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