Manufacturer: Bently Nevada
Product No.: 990-10-50-01-05
Country of origin:United States
Product Type: 990 Vibration Transmitter
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 440g
Dimensions: 10cm x 7.5cm x 5.2cm
Shipping port: Xiamen
Warranty: 12 months
The 990-10-50-01-05 is a two-wire, loop-powered vibration transmitter designed to provide a simple 4 to 20 mA proportional vibration signal directly to a machinery control system. This 990 Vibration Transmitter integrates a Proximitor Sensor into a single unit, accepting input from a 3300 NSv proximity probe and its matching extension cable. It conditions the transducer signal into appropriate peak-to-peak vibration amplitude engineering units, enabling cost-effective machinery protection alarming, logic, and overall vibration trending without requiring an external proximity sensor unit.
990: Vibration Transmitter
10: 0-10 mils pp (0-250 um pp) Full-scale Option
50: 5.0 meters (16.4 feet) System Length Option
01: 35 mm DIN rail clips Mounting Option
05: CSA Division 2, ATEX Zone 0, ATEX Zone 2 and includes ABS maritime approval Agency Approval Option
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 990-10-50-01-05 |
| Input Signal | Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Power Requirements | +12 to +35 Vdc input at the transmitter terminal (28 Vdc for Hazardous locations) |
| Signal Output | 4 to 20 mAdc over specified full-scale range in 2-wire configuration |
| Loop Accuracy | Within +-1.5% over specified full-scale range across a 250 Ohm loop resistance |
| Maximum Loop Resistance | 1,000 Ohm including cable at 35 Vdc |
| Current Limiting | 23 mA typical |
| Probe Gap Requirement | 0.5 to 1.75 mm (20 to 55 mils) from target to ensure full scale range |
| Prox Out Linear Range | 1.4 mm (55 mils), starting at approx 0.25 mm (10 mils) from target surface |
| Prox Out Scale Factor | 7.87 mV/um (200 mV/mil) +-6.5% typical; worst case +-10% |
| Frequency Response | 5 Hz to 6,000 Hz +0, -3 dB |
| Not OK / Signal Defeat | Output drops to less than 3.6 mA within 100 us of fault; restores in 2-3 seconds |
| Power-up Inhibit | Output held at less than 3.6 mA for 2 to 3 seconds after power application |
| Prox Out Impedance | 10 kOhm output impedance calibrated for a 10 MOhm load |
| Typical Noise Level | 50 mV pp |
| Minimum Target Size | 9.5 mm (0.375 in) diameter AISI 4140 steel |
| Maximum Leadwire Length | 3 meters (10 feet) for Proximitor Sensor Output (BNC connector) |
| Operating Temperature (Transmitter) | -35 to +85 Celsius (-31 to +185 Fahrenheit) |
| Storage Temperature (Transmitter) | -52 to +100 Celsius (-62 to +212 Fahrenheit) |
| Operating/Storage Temperature (Probe) | -52 to +177 Celsius (-62 to +351 Fahrenheit) |
| Relative Humidity | 100% condensing, non-submerged (with coaxial connector protection) |
| Transducer Tip Material | Polyphenylene sulfide (PPS) |
| Transducer Case Material | AISI 303 or 304 Stainless Steel (SST) |
| Probe Cable Type | 75 Ohm coaxial, fluoroethylene propylene (FEP) insulated |
| Tensile Strength | 222 N (50 lbf) probe case to probe lead, maximum |
| Transmitter Weight | 0.43 kg (0.9 lbm) |
| Total System Weight | 0.82 kg (1.8 lbm) typical |
| Connector Pin / Terminal | Function |
|---|---|
| PROX OUT | Non-isolated dynamic vibration and gap voltage signal (BNC/Terminals) |
| COM | Common reference terminal for loop power and diagnostics |
| + | Positive loop power input (+12 to +35 Vdc) |
| - | Negative loop power return / 4-20 mA current output |
| TEST | Test Input pin for external function generator signal verification |
| Coaxial Jack | Direct connection to the 3300 NSv matching extension cable |
The proximity probe must be mechanically gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target surface during installation. This ensures that the probe operates entirely within its linear range and allows the transmitter to accurately generate the full-scale 4 to 20 mA output.
When installing the probe into a threaded mounting hole, do not exceed the industry-standard maximum thread engagement length of 1.5 times the nominal thread diameter. For a 1/4-28 thread, maximum engagement is 0.375 in; for M8x1, it is 12 mm. Exceeding these limits can cause mechanical binding and voids the warranty. For 1/4-28 probes, a #3 or larger tap drill is recommended.
The PROX OUT coaxial connector provides a dynamic transducer signal for diagnostics but is not isolated from the 4 to 20 mA loop. While it can connect directly to isolated, battery-powered test equipment, using an external test adapter (such as the 990/991 Test Adapter) is strongly recommended when connecting to AC-powered equipment like oscilloscopes. This preserves loop isolation and prevents false alarms or loop degradation.
The transmitter features a potted construction rated for up to 100% condensing humidity. However, the coaxial connectors on the probe and extension cable must be physically protected against fluid ingress to maintain calibration and signal integrity.
Can the 4 to 20 mA loop output be used to analyze vibration phase or establish gap alarms?
No. The 4 to 20 mA loop output provides only overall peak-to-peak vibration amplitude data. It cannot capture vibration phase or support advanced monitoring features such as gap alarms, phase alarms, Danger Bypass, or Trip Multiply.
What happens to the loop output if the proximity probe cable is disconnected or cut?
The transmitter features a Not OK/Signal Defeat circuit. If a fault or loose connection occurs, the loop signal drops to less than 3.6 mA within 100 microseconds to prevent high outputs or false machinery alarms. It restores within 2 to 3 seconds once the fault condition is resolved.
Is an external Proximitor sensor needed when ordering this transmitter?
No. The unit features a fully integrated Proximitor sensor inside the transmitter housing. It connects directly to the 3300 NSv probe extension cable without needing an intermediary signal conditioner.
Global Express Shipping
Returns & Warranty
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Color pattern |
Greyish White
|
| Country of origin |
United States
|
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