What is the 991-06-70-01-05 Thrust Transmitter?

The 991-06-70-01-05 Thrust Transmitter is a 2-wire, loop-powered device designed mainly for OEMs of centrifugal air compressors, small pumps, motors, or fans. Its main function is to convert axial shaft displacement into a standard 4 to 20 mA signal, enabling seamless integration with machinery control systems for monitoring, alarm triggering, and automation logic. By translating mechanical movement into a proportional electrical signal, the 991-06-70-01-05 Thrust Transmitter allows operators to track axial displacement in real time, helping to avoid damage and unplanned downtime.

The transmitter includes an integrated Proximitor Sensor, removing the need for external signal conditioners, and is compact enough for installation in tight spaces such as compressor housings.

How does the 991-06-70-01-05 Thrust Transmitter work?

The 991-06-70-01-05Thrust Transmitter works with a 3300 NSv proximity probe and its extension cable. The probe measures the distance between the probe tip and the shaft surface, generating a signal proportional to the axial movement. The transmitter converts this input into a 4 to 20 mA output suitable for control systems.

Important features include:

Built-in Proximitor Sensor for direct axial displacement measurement.

PROX OUT and COM terminals provide additional diagnostic signals, including dynamic vibration and gap voltage.

Adjustable zero and span potentiometers for field calibration.

Test input pin for quick verification of loop output.

Power-up Inhibit circuit prevents errors from voltage spikes during startup.

Signal Defeat/Not OK circuit avoids false alarms caused by loose connections or faulty probes.

This combination ensures accurate real-time monitoring of axial shaft movement and smooth integration with control logic.

Advantages of the 991-06-70-01-05Thrust Transmitter

Accurate and Reliable Measurement

The transmitter provides a linear output range of 0.25 to 1.65 mm (10–65 mils) with 50 Ω output resistance, delivering precise axial displacement readings.

Enhanced Diagnostics

Non-isolated PROX OUT outputs enable simultaneous monitoring of vibration and gap voltage, facilitating predictive maintenance.

Wide Operating Conditions

Operating temperatures range from -35°C to +85°C (-31°F to +185°F) and storage from -51°C to +100°C (-60°F to +212°F). Potted construction protects against 100% condensing humidity.

Simple Integration

The 2-wire loop-powered design (+12 to +35 Vdc) allows easy connection to existing systems without extra power sources, supporting a maximum loop resistance of 1,000 Ω at 35 Vdc.

Applications of the 991-06-70-01-05 Thrust Transmitter

Centrifugal Air Compressors

Monitors shaft thrust to maintain bearing load distribution and prevent mechanical failure.

Small Pumps, Motors, and Fans

Compact design allows installation in areas with limited clearance, enabling real-time monitoring of axial displacement.

Machine Protection Systems

Delivers a standard 4–20 mA output for direct use in control systems to trigger alarms and logic responses.

Maintenance and Diagnostics

Provides PROX OUT signals for vibration and gap voltage monitoring, helping operators identify issues before failure occurs.

Operating Parameters

Parameter Specification

Full-scale Option 0.6–0–0.6 mm

System Length Option 7.0 meters (23.0 feet)

Mounting Option Bulkhead screws

Agency Approval Option Not required

Dimension 10 × 7.3 × 6 cm

Weight 0.5 kg

Operating Temperature -35°C to +85°C (-31°F to +185°F)

Storage Temperature -51°C to +100°C (-60°F to +212°F)

Input One 3300 NSv Proximity Probe and extension cable

Power +12 to +35 Vdc input

Maximum Loop Resistance 1,000 Ω including cable at 35 Vdc

Current Limiting 23 mA typical

Output Impedance Prox Out 10 kΩ calibrated for 10 MΩ load

Linear Range 0.25–1.65 mm (10–65 mils)

Leadwire Length Maximum 3 meters (10 feet)

The 991-06-70-01-05 Thrust Transmitter is a compact, reliable, and precise device for axial displacement monitoring in industrial machinery. Its integrated Proximitor Sensor, 4–20 mA loop-powered output, and diagnostic features allow OEMs and plant operators to monitor centrifugal compressors, small pumps, motors, and fans efficiently. With flexible installation, wide operating conditions, and straightforward system integration, the 991-06-70-01-05 Thrust Transmitter improves machine protection, reduces unplanned downtime, and supports predictive maintenance strategies.

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