CMCP-VALVE Rotary Potentiometer Valve Position Sensor

• 345° Range
• Rugged Cast Aluminum Housing
• 0 to 5,000Ω Output

The working component of the CMCP-VALVE valve position transmitter is a precision long-life rotary potentiometer. Attached to the end of the steam valve control shaft on a large steam turbine, the Valve Position Transducer provides a voltage proportional to the valve’s position. The Valve Position Transducer is directly compatible with the CMCP549 Valve Position Transmitter, which provides excitation voltage and outputs a 4-20 mA analog signal proportionate to the percentage of valve opening.

The output shaft is supported with a rolling-element bearing pressed into the housing. The output shaft is connected to the potentiometer with a torsionally rigid flex-coupling. This coupling compensates for minor offset and/or angular misalignment, thereby reducing lateral loading on the potentiometer.

Resistance

0 to 5,000Ω Over 345°

Maximum Input Voltage

400 VDC

Power Rating

1.0 Watt at 70°C, Derating to 0 at 125°C

Linearity

+/-0.5% of F.S.

Usable Rotation

335°

Output Smoothness

0.1%

Temperature Coefficient

+/- 100ppm/°C

Rotational Life Expectancy

25 Million Revolutions

Operating Temperature Range

-65° to +125° C (-85° to +260°F)

Vibration Range

15 G's Continuous (10 to 500 Hz), 100 G's Shock

CMCP-VALVE

Rotary Potentiometer Valve Position Sensor