• Worldwide standard for gas feeder technology
  
• Safe and reliable all-vacuum operation
  
• New, improved, space-saving design
  
• Front access to internal components
  
• Superior materials of construction
  
• Variable capacities up to 8,000 PPD (150 kg/h)
  
• Microprocessor based automatic controls
  
• Accurate gas metering of :
             Chlorine
            Sulfur dioxide
  
• Versatile vacuum regulator mounting
  
• Automatic switchover gives uninterrupted service

Capital Controls new and improved Series FX4800/4900 gas feeders are floor cabinet mounted and vacuum operated, designed to conveniently house a combination of gas feed equipment and controls. The parchment and orange cabinets enclose the gas flow control and are constructed of ABS with a textured, easily maintained finish.

Easy to install for indoor installation, each Series FX4800/4900 cabinet is factory tested and needs no field adjustment prior to start-up. Optional vacuum regulator mountings are available. Eleven different flowmeter capacities ranging from 10 to 8,000 PPD (200 g/h to 150 kg/h) provide versatility in meeting gas flow requirements.

Manual Series FX4800 gas feeders consist of a vacuum regulator and an ejector. When automatic control in required (Series FX4900), Capital Controls' automatic valve, mounted in the cabinet, responds to control signals from the remote mounted CAPTROL(r) controller. The controller receives signals from a water flow transmitter and/or chlorine residual analyzer. If multiple feed points are required, remote meter panels and additional ejectors are provided. A switchover module is available to provide for uninterrupted service.

For process water, waste treatment and water treatment in the municipal or industrial marketplace

• Disinfection: potable water, municipal wastewater

• Dechlorination: textiles, wastewater effluent

• Cooling water: slime and algae control

• Bleaching: textiles, paper, food.

• Chemical/Pharmaceutical Manufacture: process and cooling water

• Food Processing: Washdown, canning, bleaching, taste and odor control

• Metal finishing wastes: cyanide, chromium

• Zebra mussel control

Design Features

• Modern Design: Superior materials of construction provide durability, textured finish resists fingerprints and dirt.

• Reliable: All vacuum operation, integral venting system, double-thickness main regulating diaphragm.

• Safe: Remote vacuum regulator mounting enhances safety of installation.

• Versatilee: Cuylinder, ton container, wall or manifold vacuum regulator mounting in units up to 500 PPD (10 kg/h). Unit can be provided as manual or with automatic control.
  Variety of ejectors available to meet installation requirements.

• Automatic Switchover: A separate, independent vacuum operated device that does not require manual reeset. Each gas source has flow indication, a separate independent vent and an integral pressure relief device.

• Technologically Advanced : The CAPTROL® controller provides microprocessor-based control, fully field configurable with gas flow output signal. The controller accepts a signal from the flow sensor and/or residual analyzer. An automatic, linearized gas feeder control valve is provided for outstanding reliable control.

• Convenience: An easily removable from cover for access to internal components.

• Ease of installation: Simplicity of design and modularized components minimize installation.

Operation

Vacuum Regulator

Water flowing through the ejector venturi, creates a vacuum which opens the check valve in the remote ejector. The vacuum is carried through the vacuum line to the vacuum regulator where the differeential causes the inlet valve on the vacuum regulator to open, initiating gas flow. A spring opposed diaphragm in the vacuum regulator, regulates the vacuum level. The gas passes under vacuum through the cabinet mounted flowmeter and rate control valve. A differential pressure regulator (for automatic 2000 PPD/40 kg/h and above systems) maintains a constant differential across the rate control valve. Gas is transmitted through the vacuum line and to the ejector where the gas is thoroughly mixed with the water and applied as a solution.

The system is completely under vacuum from the ejector to the gas inlet valve on the vacuum regulator. If the water supply to the ejector stops or vacuum is lost for any reason, the

spring loaded inlet valve immediately closes and isolates the pressure gas supply. When the gas source is depleted, the unit seals to prevent excessive vacuum build-up and moisture from being drawn back into the gas source. When more than one feed point is desired multiple flowmeters and ejectors can be supplied.

For uninterrupted gas feeding on a round-the-clock basis, an automatic switchover system is provided. Gas flows under vacuum from the regulator in service until that source is depleted, then the switchover module automatically switches service to the fresh source. The fresh supply will not be accessed until the supply in service is exhausted.

Chemical Induction Units

Capital controls CHLOR-A-VAC TM Series 1420 chemical induction units offer improved chlorination and dechlorination through the high-efficiency mixing of gaseous chemical with process water. This translates into operating and chemical cost savings.

CHLOR-A-VAC units produce a vacuum when process water passes through water inlet ports and through a venturi. The high vacuum and recessed impeller create great turbulence and complete chemical mixing.

A chemical induction unit in lieu of an ejector should be considered for the following applications: contact basins, headwater, return sludge processes, clarifier inlets, collection basins, equalization tanks, wet wells and clear wells. (Refer to Bulletin 130.0001)

Automatic Control

For cariable flow conditions, automatic gas flow control is recommended. An automatic valve is provided to open and close in proportion to a signal received from the controller. The controller received electrical input signals from a flow meter and/or residual analyzer, causing the controller to automatically reposition the control valve to maintain desired gas feed rate oor chlorine residual.

Capacities: Standard metering tubes are available with the following capacities 10, 25, 50, 100, 200, 500, 1000, 2000, 4000, 6000, and 8000 PPD (200 g/h, 0.5 1, 2, 4, 10, 20, 40, 75, 120, 150 kg/h) of chlorine gas. To determine feed rates for sulfur dioxide, multiply each chlorine value by 0.95.

Flowmeter: The minimum feed capacity for every gas flowmeter is 1/20th of the maximum capacity for manual units 1/10th of maximum capacity for automatic units.

Electrical Requirements: 120/240 Vac. 60/50 Hz, single phase

Overall Dimensions: 55" (1391 mm) H X 23" (578 mm) W X 13" (324 mm) D

The CAPTROL® microprocessor controller is field configurable for three chlorination and two dechlorination control modes as follows:

• Flow: Proportioning valve position to process flow.
  

• Residual: Single, integral action, opening valve based on residual set point.
  

• Compound Loop: Simultaneous proportioning valve position to a combination of flow proportioning and residual control. If one signal is lost, the controller automatically proportions based on remaining signal.
  

• Feed Forward: Valve position control directly proportional to flow signal multiplied by residual signal, provided by built-in multiplier.

Automatic floor cabinet units include: controller, automatic linear gas feeder control valve, manual bypass valve for back-up of control valve and differential pressure regulator. The controller is remotely mounted.