LVDT Linear Position Sensors PGHD Series Power Generation Steam Control Valves

LVDT Position Sensor Power Generation Control Valve

Specifically Designed and Engineered for Applications in Power Generating Steam Turbine Control Systems

The Alliance Sensors Group PG Series linear sensors are the first LVDT-based valve position sensors designed and engineered specifically for applications in electric power generating steam turbine control systems.

Many features of the Alliance Sensors Group PG Sensors were requested by power gen controls engineers and are embodied in all PG models, including the PGHD Heavy Duty LVDT, the PGSD Super Duty LVDT, and the PGRR mild Radiation Resistant super duty LVDT. PG Series sensors are available in full ranges of 3 inches, 6 inches, 9 inches, 12 inches, and 15 inches.

Features

Rated for up to 350°F (175°C) operating temperature
Built-in over-temperature indicator for warranty coverage
3/8 inch diameter core extension rod…twice the diameter of typical LVDTs
Totally enclosed core…
cannot vibrate loose, break off or fall away
Double contact shaft seal keeps grit and dirt out of the LVDT’s bore
Inline ball joint on core rod takes up minor installation misalignment
Housing wall 10 to 20 times the thickness of a standard LVDT sensor
Works in 3-wire, 4-wire, 5-wire, and 6-wire systems, and with ratiometric (A-B)/(A+B) signal conditioners requiring a constant sum of the secondaries

Mild radiation-resistant version (30 Mrads for 40 years) available
Electrical connections via Euro-style screw clamp terminal block that takes no. 24 to no. 14 wire…no soldering required
3/4 NPS female conduit port accepts liquid tight connectors, cord grips, or flexible conduit fittings. 1/2 NPS female conduit adapter supplied with unit.
Optional mounting flanges, spherical rod eye ends, hold-down clamps, custom extension rods, and other installation hardware readily available
2-Year warranty … twice as long as the industry standard
For use on: Interceptor Valves, Governor Valves, Throttle Valves, Bypass Valves, Stop Valves

Also Ideal For Other Heavy Duty Linear Position Sensing Applications

Alliance Sensors Group PG Series Linear Sensors solve issues common to most LVDTs found in power gen applications. Typical AC-LVDT sensors used for valve position sensing on steam turbines, were never really designed for physically demanding use. The LVDTs get stepped on, have heavy things dropped on them, are subjected to jets of live steam, etc. The PG series can take this kind of abuse for years on end, providing a new level of reliability at comparable costs to typical LVDTs currently in use.

Everything about the Alliance Sensors Group PG Series linear sensor is heavy duty, from the wire connection terminal block inside an IP-68 sealed housing to the 3/8 inch diameter core rod, in which the LVDT’s core is encased so that it can never vibrate loose or break off. An available in-line ball joint on the connecting rod takes up installation misalignment and a double contact shaft seal keeps dirt and grit out. Electrical connections use Euro-style screw-clamp-type terminals accepting No. 24 to No. 14 AWG, eliminating the nuisance of soldering to connectors. A 3/4-NPS female hub accepts liquid tight connectors, cord grips, or flexible conduit fittings.

These sensors are engineered to survive long term, bringing a new level of reliability in the extreme environment of the steam turbine deck applications.

PG Series Datasheet

PG Series Model No. Configurator

Specifications

Alliance Sensors Group PG Series LVDT Linear Sensors Models:
PGHD	Heavy Duty
PGSD	Super Duty
PGRR	Mild Radiation Resistant Super Duty
Range Designators:		Sensitivity:
-0203	3-inch range sensor	0.20 V/V/inch
-0406	6-inch range sensor	0.10 V/V/inch
-0609	9-inch range sensor	0.67 V/V/inch
-0912	12-inch range sensor	0.50 V/V/inch
-1215	15-inch range sensor	0.40 V/V/inch
Electrical Specifications
Excitation Frequency		3 kHz
Excitation Voltage		3 V AC rms nominal
Full Scale Output (S1-S2)		3.5 V ACrms output max from differentially connected secondaries; sum of secondaries output is constant over full range for (A-B)/(A+B) ratiometric operation
P to S Phase shift		10° max
Non-linearity		≤ ±0.3% of FSO noimal (.5% max)
Environmental Specifications
Operating Temperature		-40 °C to +175 °C (-40 °F to +350 °F)
Temperature Coefficient		≤ 0.025% FSO/°C
Humidity		95% RH non-condensing
Shock		1000g, 11 msec

DOWNLOAD Outline PDF

Products By Application

Products By Type

Technical Information

Corporate Info

LVDT Linear Position Sensors PGHD Series Power Generation Steam Control Valves