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Streaming Current Detectors - SC4200

The Milton Roy Model SC4200 Streaming Current Detector (SCD) is an online electrokinetic charge analyzer that measures the net ionic and particle surface charge in a chemically treated water or wastewater sample. The SCD allows continuous monitoring and control of the coagulation process, thereby providing:

  • Consistent water quality
  • Uniform chemical dosing under varying conditions
  • Reduced chemical costs
  • Reduced manual supervision and/or automatic operation of the treatment process

Clear Digital Monitoring

Large LCD display provides real-time Streaming Current readings from -100 to +100 units for easy process monitoring.

Flexible Process Adjustments

Full-range Zero, Gain, and Filter controls allow precise tuning to match changing treatment conditions.

Built-In Alarms & Modes

High and Low alarm functions plus selectable Calibration and Run modes simplify operation and maintenance.

Dual Analog Outputs

Two 4–20 mA Streaming Current outputs enable seamless integration with control and monitoring systems.

Rugged & Reliable Design

Industrial-grade construction featuring a 316 stainless steel enclosure, advanced electronics, and patented Phase Correction circuitry.

Advanced Control Compatibility

High-flow probe design, manual Jet Wash connection, compatibility with RC7200 or other controllers support efficient automatic process control.

Applications

The Automatic Jet Wash is an optional patented sample cell cleaning system available on Milton Roy SCD’s. The system is designed to maintain cell cleanliness and signal reliability by automatically flushing the sample cell on a predetermined cycle. Flushing is accomplished by injecting water at a high velocity through the bottom of the sampling cell, which scours the cell surfaces and forces contaminants into the sample stream drain. Cleaning frequency is field adjustable to suit the application. Signal output is automatically locked during the cleaning cycle to ensure control stability.

Connect With Our Experts

We will help you to identify the right solution for your application, operating conditions and performance requirements

 

Power Required

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

Instrument Output

Two 4-20 mA Streaming Current Signals:
1 factory calibrated output; 1 customer calibrated output (max. 500 OHM load each)

Meter Readout

Digital: -100 to +100 SC Units

Operating Modes

Calibration and Run mode selectable

System Accuracy

1% of full scale

Response Time

Less than 5 seconds

Gain Adjustment

Full range continuous from 1-10 on front panel; additional internal adjust

Zero Adjustment

Full range

Signal Filter

Adjustable low pass

Sample Cell

Flow through, external type, Manual Jet Wash conn. (std); Automatic Jet Wash System (opt)

Sample Flow Rate

Standard probe: 2-4 L/min (0.5-1 gal/min)
High flow probe: 4-20 L/min (1-5 gal/min)

Sample Flow Sensor

Optional, consult Milton Roy

Sample Wetted Parts

PVC, Delrin, PTFE, & Silver

Sample Connections

Barb Type, 1/2” ID tube (standard) Barb Type, 1” ID tube (high flow)

Alarms

High and Low adjustable
Relays: SPST, 0.4 amps at 115 VAC

Operating Temp

32º F to 120º F (0 C to 50º C)

Enclosure

NEMA 4X, 316 Stainless Steel

Weight

24 lbs.

Remote Display Option

RC7200 Remote Controller Station (accepts 4-20 mA signal from SC4200 via 2 wire, twisted pair 22 AWG); max 3000 ft. separation

 

Manual Jet Wash

sc-4200-dimensions-manual-jet-wash

Automatic Jet Wash

sc-4200-dimensions-automatic-jet-wash.jpg

SC4200 Data Sheet.pdf

751 KB, PDF

SCD_Bulletin_4500_10-2025.pdf

2.8 MB, PDF

MR-En-Manual-streaming-current-detector-sc4200-manual.pdf

1.4 MB, PDF

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