The Barber Colman PP-8121 is a pneumatic transmitter/controller designed for use in pressure-independent Variable Air Volume (VAV) terminal units. It combines temperature sensing and velocity pressure measurement to modulate airflow and maintain desired room conditions in HVAC systems.
Technical Specifications
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Model: PP-8121
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Function: Pneumatic transmitter/controller
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Application: Pressure-independent VAV terminal units
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Temperature Range: 41°F to 95°F
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Velocity Pressure Range: 0.01 to 1.5 inches water column (in. w.c.)
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Output: Pneumatic signal for actuator control
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Mounting: Typically mounted within VAV terminal units
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Condition: Discontinued by manufacturer
Key Features
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Integrates temperature and pressure sensing for precise airflow control
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Maintains consistent room temperature and air volume
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Pneumatic output compatible with standard HVAC actuators
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Designed for seamless integration into VAV systems
Compatible Applications
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Commercial HVAC systems utilizing pressure-independent VAV terminal units
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Environments requiring precise temperature and airflow regulation
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Systems employing pneumatic control strategies
Installation & Maintenance Notes
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Ensure proper calibration for accurate temperature and pressure readings
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Regularly inspect pneumatic connections for leaks or blockages
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Verify compatibility with existing VAV terminal unit configurations
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