Low Minimum Detection Limit for Efficient Residual Chlorine Monitoring
The Hach 9184 sc Amperometric Free Chlorine Sensor has a minimum detection limit of 5 ppb or 0.005 mg/L hypochlorous chlorine in the form of HOCl. Together with
pH and temperature measurements, free chlorine concentration is calculated using dissociation curves stored in the instrument.
Wide Measurement Range
The 9184 sc free chlorine sensor is particularly useful for drinking water distribution monitoring, chlorination applications, demineralizer systems, wastewater, or cooling
water processes due to its 0 to 20 ppm measurement range.
Continuous Chlorine Measurement
Measurements are made continuously by the sensor and reported to the controller.
Models and Options
The standard Hach 9184 sc Amperometric Free Chlorine Sensor continuously measures total free chlorine (TFC) by measuring temperature and pH together with HOCl to
calculate hypochlorite ions (OCl–). HOCl combined with OCl–equals total free chlorine.
Available options include:
Acidification Unit—Used to maintain 2% accuracy when sample pH is greater than 7.5. Alternately, it can be used intermittently or continuously for cleaning and is fully
programmable.
Intermittent Flow Unit—This fully programmable unit saves resources while limiting excess flow to drain.
Hypochlorous Chlorine (HOCl) Only—This sensor does not compensate for pH and is designed for use in applications where pH does not fluctuate. This option is only available after consultation with Hach Technical support.
Easy Setup and Maintenance
The all-inclusive 9184 sc free chlorine system comes preassembled on a panel. Just mount the panel in the desired location, insert the sensors, and connect the controller to get started. The membrane system of the sensor means there are no reagents used for measurement. Maintenance is minimal and two years of typical maintenance items are included with the system.
Compatible with Hach Multi-Sensor, Multi-Parameter Digital Controllers
The Hach 9184 sc free chlorine sensor is used with Hach’s Digital Controllers. Hach's sc Digital Controllers accept from two to eight sensors. Multiple sc controllers
can be networked to accommodate many more sensors and parameters, reducing the cost per measuring point. Just connect any Hach “plug and play” digital sensor and
it’s ready to use without software configuration. “Plug and play” connectivity means there’s no complicated wiring or set up. Network the 9184 sc Amperometric Free Chlorine Sensor with any of Hach’s digital sensors for measuring dissolved oxygen, turbidity, ORP, conductivity, and many other parameters.
Feature | Details |
Measurement Range | 0 to 20 ppm (mg/L) as hypochlorous acid (HOCl) |
Minimum Detection Limit | 5 ppb or 0.005 mg/L HOCl |
Accuracy | 2% or ±10 ppb TFC, whichever is greater at pH <7.5 2% or ±10 ppb HOCl, whichever is greater at pH <8 |
Standard Deviation | 0.7% |
Response Time | 90% in less than 90 seconds |
Measurement Interval | Continuous |
Minimum Flow Rate | 14 L/hr (200 to 250 mL/min), auto-regulated by flow thru cell |
Pressure Range | 0.1 to 2 bar in flow cell |
Storage Temperature | -20 to 60°C |
Operating Temperature | 0 to 45°C |
Operating Humidity | 0 to 90% non-condensing |
Sample Temperature | 2 to 45°C |
Temperature Compensation | Automatic over sample temperature range |
Sample pH | 4 to 8 (acidification unit available for pH greater than 8) |
Power Consumption | 12 V, 1.5 watts (provided by controller) |
Measurement Technology | Amperometric/Membrane (electrode, membrane, electrolyte) |
Interferences | No interference from chloramines Chlorine dioxide and ozone interfere with measurement |
Zero Calibration | Electrically (automatic) or with de-chlorinated water |
Calibration | Comparison of lab method with process sample |
pH Calibration | Single- or two-point using standards or comparison of lab method with process sample |
Calibration Interval | 2 months |
Maintenance Interval | Measurement Cell: 6 months for membrane and electrolyte, typical<br>pH Cell: 1 to 1.5 years, typical |
Mounting | Flat, vertical surface (panel, stand, etc.) |
Connections | Sample Line: 1/4-in. O.D. Drain Line: 1/2-in. I.D. (supplied) |
Materials | Electrode: gold cathode/silver anode Measuring cell: acrylic Probe body: PVC |
Environmental Ratings | IP-66/NEMA 4X |
Certifications | UL, CSA (certified by ETL), CE |
Dimensions | 270 x 250 mm (10.63 x 9.84 in.) |
Shipping Weight | 6.5 kg (14.3 lbs.) |
Accessories | Acidification Unit: Use for pH adjustment to force sample pH to between 5.5 and 6.5. Cleaning: can be set to inject cleaning solution through the measurement cell for cleaning. Always on or programmable via controller relays. Equipped with power switch. NEMA 4X/IP66 compliant. Connects in series with analyzer. Complete system requires one input to the controller. Intermittent Flow Unit: Use to minimize the amount of water by eliminating continuous sample flow. Programmable via controller relays. NEMA 4X/IP66 compliant. Connects in series with analyzer. Complete system requires one input to the controller. |
