Month: April 2025

Rosemount 3153N Nuclear Qualified Pressure Transmitter

Industry-leading performance

– Meets the following standards

o IEEE Std 323™-1974/1983/2003

o IEEE Std 344™-1975/1987/2004

– 36 Mrad (360 kGy) TID Gamma Radiation

– 8.5g ZPA Seismic

– 333ºF (167.2ºC) Vapour/Temperature

– 0.2% Reference Accuracy

Introduction to the Rosemount 3153N Nuclear Pressure

The Rosemount 3153N Nuclear Pressure Transmitter is designed for precision pressure measurement in nuclear applications.

These applications require reliable performance and safety over a long service life.

The 3153N complies with IEEE Std 323™-1974/1983/2003 and IEEE Std 344™-1975/1987/2004.

Irradiance is 36 Mrads TID Gamma, Seismic Rating 8.5g ZPA, and Vapour Pressure/Temperature Performance.

Rigorous quality control during manufacturing includes traceability of pressure retaining components, special nuclear cleaning and hydrostatic pressure testing.

Transmitter Description

The Rosemount 3153N transmitter is similar in construction and performance to the proven Rosemount 3051 transmitter.

The transmitter is available in absolute (AP), gauge (GP), and differential (DP) configurations with a choice of six pressure ranges.

Direct electronic sensing using a fully sealed coplanar capacitive sensing element (see Figure 1) eliminates mechanical force transfer and problems associated with shock and vibration.

Compact design, two-wire system compatibility, and non-interactive external range and zero adjustments for standard calibration simplify installation and commissioning.

Wiring terminals and electronics are located in separate compartments, helping to

ensure that the electronics remain sealed during installation.

A6210 Thrust Position, Differential Expansion and Rod Position Monitor for AMS 6500 Machinery Health Monitor

The A6210 monitor has 3 different operating modes: thrust position, differential expansion or rod position.

The thrust position mode precisely monitors the thrust position and reliably protects the machine by comparing the measured axial position with the alarm position.

Reliably provides machine protection by comparing the measured axial position with the alarm setpoint.

Setpoints – drive alarms and relay outputs, thus reliably providing protection for the machine.

Axial thrust monitoring is one of the most critical measurements on turbomachinery.

Sudden and small axial movements should be detected within 40 milliseconds or less to minimise or avoid rotor-to-casing contact.

or avoid rotor-to-case contact. Redundant sensors and voting logic are recommended.

Thrust bearing temperature measurement is strongly recommended as a supplement to thrust position monitoring.

Shaft thrust monitoring consists of one to three displacement sensors mounted on the shaft end or thrust collar in the axial direction parallel to the shaft.

The displacement sensors are non-contact sensors that measure shaft position.

For critically important safety applications, the A6250 monitor provides triple redundant thrust protection.

The A6210 monitor can also be configured for differential expansion measurement.

During turbine start-up, both the casing and the rotor expand due to changes in thermal conditions.

Differential expansion therefore measures the relative difference between the displacement sensor mounted on the housing and the target of the sensor mounted on the shaft. If

housing and shaft grow at approximately the same dcs-sis.com rate, the differential expansion remains ideally close to zero.

Differential expansion measurement modes are supported in series/complementary or cone/slope modes.

Finally, the A6210 monitor can be configured in average rod drop mode to monitor riding belt wear in reciprocating compressors.

Over time, the rider band in a horizontal reciprocating compressor wears due to the force of gravity acting on the horizontally orientated piston in the compressor cylinder.

If the rider belt wears beyond the point where the piston would come into contact with the cylinder wall, damage to the machine and possible malfunction occurs.

By installing at least one displacement probe to measure the piston rod position, you will be notified when the piston drops – a sign of a worn rider band.

You can then set the shutdown protection threshold for automatic tripping.

CSI A6120 Enclosure Seismic Vibration Monitor for CSI 6500 Machinery Health Monitor

The Case Seismic Vibration Monitor for use with electromechanical seismic sensors is designed for high reliability on the plant’s most critical rotating machinery.

This 1-slot monitor is used in conjunction with other CSI 6500 monitors to form a complete API 670 machinery protection monitor.

Applications include steam, gas, compressors and hydraulic turbines. Casing measurements are common in nuclear power applications.

The primary function of the casing seismic vibration monitor is to accurately monitor casing seismic vibration, the

and to reliably protect machinery by comparing vibration parameters with alarm set points, actuated alarms and relays.

A case seismic vibration sensor, sometimes referred to as a case absolute vibration sensor (not to be confused with a shaft absolute vibration sensor), is an electrodynamic, internally spring-loaded, and magnetically actuated vibration sensor.

It is an electrodynamic, internal spring and magnet, velocity output type sensor.

A housing seismic vibration monitor monitors the overall vibration of a bearing housing at millimetres per second (inches per second).

Since the sensor is mounted on the bearing housing, vibration in the housing can be affected by many different sources.

These include rotor motion, foundation and bearing box stiffness, blade vibration, adjacent machinery, etc.

When replacing ffeld sensors, many are being updated to piezoelectric sensors, which provide internal integration from acceleration to velocity.

Piezoelectric sensors are a new type of electronic sensor rather than the older electromechanical type.

Case Seismic Vibration Monitors are backward compatible with electromechanical sensors installed in the ffeld.

The CSI 6500 Machinery Health Monitor is an integral part of PlantWeb® and the AMS Suite.

PlantWeb combines Ovation® and DeltaV™ process control systems to provide operators with an integrated view of machinery health.

The AMS Suite provides maintenance personnel with advanced predictive and performance diagnostic tools to accurately determine machine failures at an early stage.

Features:

Dual-channel, 3U-sized, 1-slot plug-in module that cuts cabinet space requirements in half compared to traditional four-channel 6U cards

API 670-compliant hot-swappable modules

Remotely selectable limit multiplication and trip bypass

Pre- and post-buffered and proportional outputs, 0/4-20 mA outputs, 0 – 10 V outputs

Use with electric (electromechanical) sensors 9266. 9267. or 9268

Sensor Inputs

Number of inputs: two independent channels

Input Type: Electro-mechanical, Differential

Emerson sensor inputs: Part No. 9266. 9267. or 9268

Isolation: Galvanically isolated from power supply

Input resistance: >100 kΩ

Input voltage range: – 5 – +15 VDC

Input frequency range:

Lower cut-off frequency 1 or 5 Hz

Upper cut-off frequency 50 – 2000 Hz adjustable