76683-50 Bently Nevada 35 mm Proximitor Sensor
76683-50
76683-50 is a legacy Bently Nevada 7200-series 35 mm Proximitor Sensor calibrated for a 5 m combined probe-and-extension-cable electrical length. 76683-50 accepts one compatible non-contacting 7200-series 35 mm probe and extension cable and provides the signal-conditioning stage used for extended-range measurements such as differential expansion. 76683-50 is not a complete transducer system and does not include the probe, extension cable, monitor or field wiring.
Scope note: 76683-50 is only the Proximitor Sensor. The published 12.7 mm range, scale factor, linearity and target requirements belong to the complete matched 35 mm system, not to 76683-50 alone.
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76683-50 decodes exactly in Bently Nevada document 141594-01 as the 35 mm Proximitor Sensor for a combined system electrical length of 5 m.
76683-50 conditions the signal from a matched 7200-series 35 mm probe chain. The manufacturer identifies the complete 35 mm system primarily for differential-expansion measurement on medium and large steam turbines.
76683-50 is only the Proximitor Sensor. The published 12.7 mm range, scale factor, linearity and target requirements belong to the complete matched 35 mm system, not to 76683-50 alone.
| Manufacturer | Bently Nevada Corporation |
|---|---|
| Part number | 76683-50 |
| Lifecycle | Legacy 7200-series component |
| Component | 35 mm Proximitor Sensor signal conditioner |
| Compatible input | One non-contacting 7200-series 35 mm probe and matching extension cable |
| Combined system electrical length | 5 m (16.4 ft) |
| Input power | -18 to -24 Vdc at 12 mA maximum |
| Output resistance | 50 ohm |
| Sensor material | A380 aluminum |
| Sensor operating and storage temperature | -34 to +100 deg C (-29 to +212 deg F) |
| Recommended field wiring | Three-conductor shielded triad cable |
| Maximum sensor-to-monitor field wiring | 305 m (1,000 ft); consult the manual for frequency roll-off at longer lengths |
| Not included | 35 mm probe, extension cable, monitor and field wiring |
| Manufacturer source | BNC 141594-01 Rev. A (November 2000), archived manufacturer-authored datasheet |
| Complete-system Required matched chain | 76683-50 requires one compatible 7200-series 35 mm probe and matching extension cable totaling 5 m combined electrical length. |
| Complete-system Linear range | 12.7 mm (500 mil), from approximately 1.3 to 14.0 mm (50 to 550 mil) target gap |
| Complete-system Approximate output across range | -1.5 to -11.5 Vdc |
| Complete-system Average scale factor | 0.79 V/mm (20 mV/mil), +/-6% including interchangeability error under the published conditions |
| Complete-system Linearity | Less than +/-0.33 mm (+/-12.8 mil) deviation from best-fit straight line |
| Complete-system Minimum flat target diameter | 57 mm (2.25 in) |
| Complete-system Primary manufacturer-stated application | Differential expansion on medium and large steam turbines |
| Complete-system Electrical classification | Complete family complies with the European CE mark; hazardous-area approvals are not available |
Compatibility statements are limited to the cited manufacturer documentation. Availability, condition and substitution must be confirmed separately.
76683-50 is a legacy Bently Nevada 7200-series 35 mm Proximitor Sensor. 76683-50 is the signal-conditioning component of an extended-range proximity transducer system.
76683-50 is the 5 m version. The compatible 35 mm probe plus extension cable connected to 76683-50 must have a combined electrical length of 5 m.
76683-50 accepts one compatible non-contacting 7200-series 35 mm probe and its matching extension cable.
76683-50 requires -18 to -24 Vdc at 12 mA maximum and has a published output resistance of 50 ohm.
76683-50 has a published Proximitor Sensor operating and storage temperature range of -34 to +100 deg C (-29 to +212 deg F).
76683-50 is not a complete differential-expansion transducer. 76683-50 requires the matched 35 mm probe and extension cable, and the monitor and field wiring are separate.
76683-50 alone does not provide a guaranteed 12.7 mm range. The published range, scale factor and linearity apply only when 76683-50 is used in the correct matched 5 m 35 mm transducer system.
When replacing 76683-50, verify the full 76683-50 nameplate, the 5 m calibration, the 35 mm probe and extension-cable electrical length, target geometry, monitor configuration and legacy lifecycle requirements.
Send the complete part number, installed-system details, quantity, destination and clear label photos. Availability and condition will be confirmed before quotation.
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