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Streaming Current Detectors - RC7200

  • A complete Proportional+Integral+Derivative (PID) process controller
  • Used with the SC2200 or SC4200 to provide automatic control of the coagulant dosing process
  • Digital LED display, -100 to +100 Streaming Current Units & Set Point
  • 4-20 mA process control signal output; Alarm contacts
  • Continuous PID auto-tune
  • Microprocessor based with self diagnostics
  • Automatic and Manual mode selectable
  • Available in panel mount or NEMA 4X enclosure
  • Can be mounted up to 3000 feet from the SCD or metering pump
  • RS-485 optional for direct serial computer link to process controller
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Remote Process Control

A self-contained PID controller that provides remote indication, configuration, and automatic control for SC2200 and SC4200.

Automated Coagulation Optimization

Automatically adjusts chemical dosing to maintain the desired water quality based on a user-defined Streaming Current setpoint.

Closed-Loop Control Performance

Uses a 4–20 mA communication signal to enable reliable closed-loop control of the coagulation process.

Flexible Chemical Dosing Integration

Provides a 4–20 mA control output for metering pumps, control valves, and chemical dosing equipment, with built-in signal and alarm connections.

Intelligent Auto-Tuning

Auto-tune technology that automatically analyzes process changes and optimizes PID settings without manual parameter adjustments.

Flexible Installation Options

Wall-mount and panel-mount configurations, allowing convenient installation anywhere, with up to 3,000 feet of separation from connected equipment.

Applications

showcase-block-water

Water Treatment

Close control of coagulants is necessary to meet drinking water standards. The Milton Roy SCD optimizes the dosing of Alum, Ferric Chloride, Polymer, and other coagulants. This assures efficient control of turbidity, consistent production of high quality water, and maximum removal of giardia and cryptosporidium. With ever increasing water quality standards, the SCD makes sense as the best available technology.

Wastewater Treatment

The Milton Roy SCD is beneficial in applications such as belt press, centrifuge, and dissolved air flotation. The SCD constantly monitors polymer feed, permitting optimal dewatering while reducing chemical usage.
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High Purity Water

Pretreatment systems for high purity water that require the addition of a coagulant benefit greatly from a Milton Roy SCD in the process loop. Overdosing or underdosing of polymers can cause fouling of ion exchange resins or membranes. The SCD maintains optimal dosage, eliminating this potential expensive upset.

Industrial Processes

Any process where cationic or anionic chemicals are added are potential SCD applications. The food, petrochemical, and paper industries are finding the Milton Roy SCD to be a valuable tool for optimizing the product quality.

 

Power Required

115 VAC, 50/60 hz (standard)
230 VAC, 50 hz (optional)

Instrument Input

4-20 mA Streaming Current Signal from SC2200 or SC4200

Instrument Output

4-20 mA process control signal (500 OHM load max.)

Communications

RS-485 (optional)

Control Functions

Single loop Proportional+Integral+ Derivative (PID); Continuous auto-tune; Microprocessor based with self diagnostics; Auto & Manual mode selectable

System Accuracy

1% of full scale

Response Time

Less than 5 seconds

Meter Readout

Dual Digital Meters: -100 to +100 Streaming Current Units and Process Set Point

Operating Temp.

32°F to 120°F (0°C to 50°C)

Alarms

Band type; deviation from set point
Relays: SPDT, 2 amps at 115/230 VAC

Enclosure

NEMA 4X, Polycarbonate (wall mount only)

Weight

Wall mount = 6 lbs.
Panel mount = 2 lbs.

Control Wiring

2 wire, twisted pair, 22 AWG , shielded (max. 3000 ft. separation from SC2200 or SC4200)

 

RC7200 Panel Mount

Mounting Hole Dimensions

Slide in:

  • 3 5/8" high X 3 5/8" wide cutout (no holes required)

Bolt on:

  • 4 29/32" high X 3 17/32" wide
  • 7/32" diameter mounting holes
  • 4 1/2" high X 4" wide panel cutout
rc7200-panel-mount

RC7200 NEMA 4X Wall Mount

Mounting Hole Dimensions

  • 7 15/32" high X 6 3"32" wide
  • 1/4" diameter mounting holes
rc7200-nema-wall-mount

SC7200 Data Sheet.pdf

767 KB, PDF
Download

SCD_Bulletin_4500_10-2025.pdf

2.8 MB, PDF
Download

MR-En-Datasheet-streaming-current-detector-sc7200-datasheet.pdf

767 KB, PDF
Download

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