Which engineering value represents 20 mA from 990-04-70-01-01?

The selected endpoint is 4 mils peak-to-peak, approximately 100 micrometres peak-to-peak. The receiver should interpret 4 mA as the zero-amplitude end of the span.

How does the DIN fitting of 990-04-70-01-01 differ from the combined mounting option?

Its 01 mounting code specifies 35 mm DIN-rail clips. The combined clips-and-screws arrangement belongs to mounting code 03.

What is the relationship between 990-04-70-01-01 and the external protection controller?

The transmitter conditions one proximity measurement into a proportional current. The controller interprets that current and executes alarm or trip logic.

Why should a below-3.6 mA output from 990-04-70-01-01 be investigated as a fault state?

It is the Not OK/Signal Defeat level or initial power-up inhibit, rather than a normal point within the 4-20 mA measurement range.

Can the COM terminal of 990-04-70-01-01 be treated as an isolated instrumentation output?

No. The diagnostic PROX OUT/COM connection is non-isolated. Use the prescribed isolated test arrangement with grounded equipment.

What ambient temperature range applies to the transmitter body of 990-04-70-01-01?

The transmitter operating range is -35 to +85 degrees Celsius. Probe temperature limits are separate and must not be used as the transmitter enclosure limit.

Which area option is selected by the final 01 in 990-04-70-01-01?

It selects CSA Division 2. Installation still requires matching the actual unit markings, wiring method and permitted environment.

How should zero and span be verified on 990-04-70-01-01 after replacement?

Exercise the controlled test input through the required loop points and compare measured current with receiver indication. Retain the 0-4 mil scale and verify both endpoints before release.

990-04-70-01-01

Name: 990-04-70-01-01
Brand: Bently Nevada
SKU: 990-04-70-01-01

Vibration Transmitter

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

Bently Nevada 990-04-70-01-01 is a two-wire vibration transmitter with a 0-4 mils peak-to-peak span and a 7.0 m 3300 NSv transducer system.

Manufacturer part number
990-04-70-01-01
Shipping
Swift global dispatch
Condition
New, original product
Shipping size (est.)
10cm x 7.3cm x 6cm
Country of Origin
USA

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What happens after you enquire

0

Review your reference

Send the complete Bently Nevada 990-04-70-01-01 reference, label photographs and required quantity. Include the 0-4 mils peak-to-peak scale and 7.0 m transducer chain.
1

Confirm the offer

Review the offered revision, condition, included items and documents against the confirmed installation.
2

Arrange dispatch

Confirm quantity, dispatch date, lead-time start and delivery details in the quotation.

Match the complete marking

Include the complete Bently Nevada 990-04-70-01-01 marking and any hardware revision on the item. Include the 0-4 mils peak-to-peak scale and 7.0 m transducer chain.
Check the offered item before ordering

Request available label and connector photos. Have your maintenance team compare the offered 990-04-70-01-01 with the installed equipment and applicable Bently Nevada documentation.

Technical specifications for 990-04-70-01-01

Manufacturer:

Bently Nevada
Product Category:

Machinery Monitoring Systems
Spare Part Number:

990-04-70-01-01
Weight:

0.44 kg
Tariff Code:

8537101190
Measurement:

Radial vibration
Full-scale span:

0-4 mils peak-to-peak
Electrical system length:

7.0 m
Signal output:

4-20 mA; two-wire
Terminal supply:

+12 to +35 VDC
Maximum loop resistance:

1000 ohms at 35 VDC; includes cable
Frequency response:

5 Hz-6000 Hz; +0/-3 dB
Current limit:

23 mA typical
Mounting:

35 mm DIN-rail clips
Transmitter temperature:

-35 to +85 degrees C
Fault current:

Below 3.6 mA

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Information

Overview Downloads Applications / Compatibility Product Precautions

Bently Nevada 990-04-70-01-01 brings radial shaft motion into the machinery controller through a powered current loop, while retaining a separate diagnostic connection for the probe signal.

Measurement span: 0-4 mils peak-to-peak
Transducer system: 7.0 m, compatible 3300 NSv probe and cable
Mounting: 35 mm DIN-rail clips

The selected configuration combines a 0-4 mils peak-to-peak measurement span, a 7.0 m transducer system and 35 mm din-rail clips. The integrated proximity conditioner accepts one compatible 3300 NSv probe with its matched extension cable; the probe lead and extension together establish the calibrated length.

The two-wire loop supplies power and transmits peak-to-peak shaft vibration amplitude as 4-20 mA. The receiving control system supplies the alarm and protection logic. Non-interacting zero and span adjustments support loop calibration, while the TEST input accepts a AC signal generator for controlled output checks.

The separate PROX OUT/COM and coaxial connection provide the dynamic and gap signal for diagnosis. This output is non-isolated and must be used with the specified test arrangement. Not OK/Signal Defeat drives the loop below 3.6 mA on a faulty transducer connection; power-up and fault recovery require approximately 2-3 seconds.

Controller platform reference: 3300 NSv transmitter system. Retain the calibrated chain and receiver scale.

The original technical excerpt for Bently Nevada 990-04-70-01-01 covers transmitter operation, electrical limits and diagnostic connections. The separate installation guide covers measurement scaling, loop burden, cable matching and controlled loop tests.

Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.

System and supply context: 990-04-70-01-01 connects a matched NSv probe and extension to a powered current-loop receiver. Probe, cable, test adapter and receiving control equipment are separate unless included in the quotation.

Application scope: Use the 0-4 mils peak-to-peak scale for shaft-vibration supervision of the assigned machine point. Protective alarm logic remains in the receiving system.

Machine-point signal conditioning
Convert one radial vibration measurement into a 4-20 mA input for the controller.
Calibrated loop renewal
Retain the 0-4 mils peak-to-peak receiver range and 7.0 m electrical chain when replacing the transmitter.
Probe-signal diagnosis
Observe the dynamic and gap signal with the specified diagnostic connection and instrument isolation.
Protection-loop verification
Use the TEST input with a AC signal generator to compare signal output and receiving indication.

Prepare Bently Nevada 990-04-70-01-01 for its configured installation using these checks.

Retain the measurement scale

Keep 0-4 mils peak-to-peak and its units in the receiver configuration.

Match the calibrated chain

The probe and extension together must equal 7.0 m.

Check loop burden

Provide the required terminal voltage after wiring and receiver losses.

Keep test grounding controlled

The diagnostic connection is non-isolated.

Recognize Not OK

Distinguish below-3.6 mA fault and startup states from valid measurements.

Restore protection deliberately

Remove test inputs and verify stable measurement before clearing the approved bypass.

Alternative Names

990 04 70 01 01 Bently Nevada 990-04-70-01-01

Technical notes

Protection interface: The receiving control system applies alarm thresholds to the current signal. Validate that signal path together with its configured failure-current handling.

Ground reference: Keep the diagnostic common reference controlled during testing. A grounded test instrument must not introduce an unintended connection through the buffered output.

FAQ View All FAQ

Which engineering value represents 20 mA from 990-04-70-01-01?

The selected endpoint is 4 mils peak-to-peak, approximately 100 micrometres peak-to-peak. The receiver should interpret 4 mA as the zero-amplitude end of the span.
How does the DIN fitting of 990-04-70-01-01 differ from the combined mounting option?

Its 01 mounting code specifies 35 mm DIN-rail clips. The combined clips-and-screws arrangement belongs to mounting code 03.
What is the relationship between 990-04-70-01-01 and the external protection controller?

The transmitter conditions one proximity measurement into a proportional current. The controller interprets that current and executes alarm or trip logic.
Why should a below-3.6 mA output from 990-04-70-01-01 be investigated as a fault state?

It is the Not OK/Signal Defeat level or initial power-up inhibit, rather than a normal point within the 4-20 mA measurement range.

Can the COM terminal of 990-04-70-01-01 be treated as an isolated instrumentation output?

No. The diagnostic PROX OUT/COM connection is non-isolated. Use the prescribed isolated test arrangement with grounded equipment.
What ambient temperature range applies to the transmitter body of 990-04-70-01-01?

The transmitter operating range is -35 to +85 degrees Celsius. Probe temperature limits are separate and must not be used as the transmitter enclosure limit.
Which area option is selected by the final 01 in 990-04-70-01-01?

It selects CSA Division 2. Installation still requires matching the actual unit markings, wiring method and permitted environment.
How should zero and span be verified on 990-04-70-01-01 after replacement?

Exercise the controlled test input through the required loop points and compare measured current with receiver indication. Retain the 0-4 mil scale and verify both endpoints before release.

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