Fume Hood Controller Owner's Manual

Basic Operation

The Fume Hood Controller provides Direct Digital Control (DDC) technology for controlling fume hood face velocities in a manifolded fume hood exhaust system.

High and Low Exhaust Flow Control

The Fume Hood Controller can operate at two different setpoints, described as HI flow and LOW flow setpoints. The low setpoint can be set to zero to send the controller into an OFF mode. The OFF mode shuts off the flow alarms and closes the exhaust flow control device and allows the controller to go into a standby mode of operation.

The Operators Display Panel (ODP) can display HI/LOW setpoint or output exhaust flow in CFM. Due to display limits, the actual number displayed is CFM divided by 10.

Control Loops

The PID loop controls the exhaust flow control device based on the values of the exhaust flow and the flow setpoint. The loop output controls the supply and exhaust through a time modulation scheme. The control loopout ranges from -100 to 100%.

•-100% is the maximum supply that closes the exhaust flow control device at full speed.

•0% holds the exhaust flow control device at its current position.

•100% is the maximum exhaust that opens the exhaust flow control device at full speed.

Electronic

The controller sends a separate signal to each of the two inputs that reside on the AO-E module. For values of 100% to 0%, the controller sends a decreasing percentage of the full signal length to the retract input. For values of 0% to -100%, the controller sends an increasing percentage of the full signal to the extend input.

Pneumatic

The controller sends a separate signal to each of the two solenoids that reside on the AO–P module. For values of 100% to 0%, the controller sends a decreasing percentage of the full signal length to the exhaust solenoid. For values of 0% to -100%, the controller sends an increasing percentage of the full signal length to the supply solenoid.

Calibration

Air Velocity Sensor - Calibration of the controller's air velocity sensor is periodically required to maintain accurate air velocity readings.

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Siemens Building Technologies, Inc.

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Siemens 125-5033 owner manual High and Low Exhaust Flow Control, Calibration, Control Loops, Electronic, Pneumatic
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125-5033 specifications

The Siemens 125-5033 is a highly regarded circuit breaker in the world of electrical engineering and power distribution. Known for its robust design and versatile applications, this device offers a host of features that make it suitable for both commercial and industrial use.

One of the main features of the Siemens 125-5033 is its compact size. This allows for easy integration into existing systems without occupying excessive space, making it an ideal choice for facilities with limited room for electrical infrastructure. Its ability to handle high current ratings, typically around 125 amps, ensures that it can support a variety of electrical loads, making it versatile across different applications.

The Siemens 125-5033 employs advanced technologies, such as thermal-magnetic trip mechanisms. This allows for reliable protection against overloads and short circuits. The thermal component of the trip mechanism is designed to react to sustained overcurrent conditions, while the magnetic component responds instantaneously to short circuits. This dual-functionality ensures that the circuit breaker can effectively protect both the conductors and the connected equipment.

In terms of safety, the Siemens 125-5033 comes with advanced arc suppression technologies that minimize the risk of arcing during the circuit interrupting process. This not only enhances the longevity of the breaker but also safeguards personnel working near electrical installations. Additionally, the device features a clear, accessible reset mechanism, making it user-friendly and easy to operate in case of an interruption.

Another notable characteristic of the Siemens 125-5033 is its built-in ground fault protection option. This capability provides an added layer of safety, ensuring that any ground faults are detected and addressed promptly. It is particularly useful in environments where moisture or dust can compromise electrical safety.

The Siemens 125-5033 also boasts compatibility with various monitoring and control systems, enabling seamless communication and integration into smart building management systems. This feature allows facility managers to monitor power usage, identify potential issues, and optimize energy consumption effectively.

Overall, the Siemens 125-5033 circuit breaker is a reliable, safe, and technically advanced choice for those looking to enhance their electrical systems. Its compact size, dual-trip mechanism, ground fault protection, and compatibility with modern technologies make it a valuable asset for any facility looking to improve its electrical safety and efficiency.
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