Sterilight Cobalt Series Ultraviolet (UV) Sterilizers
![Sterilight Cobalt Series UV Water Purifier](images/sterilight-cobalt-series.jpg)
The Sterilight Cobalt Series is ideally suited for whole house water treatment to kill bacteria (including coliform and e.coli), viruses, cryptosporidium, giardia, and a wide range of other microbiological contaminants where flow rates of under 31 gpm are required. Given its economical price, and optional emergency solenoid shut-off kit, the Cobalt Series is a popular choice for homeowners with a known contamination problem involving a serious contaminant like e.coli, cryptosporidium, or giardia.
All Cobalt Series units feature a stainless steel reactor chamber, a fire-polished domed quartz sleeve, and a high output Sterilight Sterilume™-HO coated low pressure germicidal UV lamp which can be conveniently changed without interrupting the water flow. The UV lamp provides a 4-log (99.99%) reduction of bacteria, viruses, and protozoan cysts (cryptosporidium and giardia) at the specified maximum flow rates. The Cobalt Series electronic controller features a switchable power supply that automatically detects line voltage between 100-240 volt and adjusts its operating settings accordingly.
The Sterilight Cobalt Series is composed of 4 models with treatment capacities ranging from 6 to 30 gallons per minute.
Sterilight SC-200 |
Sterilight SC-320 |
Sterilight SC-600 |
Sterilight SC-740 |
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Applications | small home | average home | all homes | large homes commercial |
Max. Flow Rate (UV dose >30 mJ/cm2)* |
8 GPM (30.3 LPM) |
13 GPM (49.2 LPM) |
32 GPM (121.1 LPM) |
40 GPM (151.4 LPM) |
Max. Flow Rate (UV dose >40 mJ/cm2)* |
6 GPM (22.7 LPM) |
10 GPM (37.8 LPM) |
24 GPM (90.8 LPM) |
30 GPM (113.5 LPM) |
Water Chamber Material | 304 Stainless Steel | |||
Chamber Length | 17.8 inches / 45.2 cm | 22.8 inches / 57.9 cm | 30.7 inches / 78.0 cm | 39.4 inches / 100.0 cm |
Chamber Diameter | 3.5 inches / 8.9 cm |
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Controller Size | 9.4 x 3.2 x 2.5 inches / (24.1 x 8.1 x 6.4 cm) | |||
Lamp | Sterilume-HO Model S200RL-HO |
Sterilume-HO Model S320RL-HO |
Sterilume-HO Model S600RL-HO |
Sterilume-HO Model S740RL-HO |
Sleeve | Quartz Model QS-200 |
Quartz Model QS-320 |
Quartz Model QS-600 |
Quartz Model QS-740 |
Electrical | 100-240v, 50/60HZ (240 volt plug is special order, please call us for details) | |||
Power Consumption | 35 watts | 42 watts | 73 watts | 88 watts |
Lamp Power | 27 watts | 34 watts | 65 watts | 80 watts |
Inlet / Outlet Plumbing Ports | Combo 3/4" FNPT / 1" MNPT | 1" MNPT | 1.5" MNPT | |
"Power-On" Indicator Light | ![]() |
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Audible Lamp Failure Alarm | ![]() |
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Lamp Replacement Reminder | ![]() |
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LED Display: Lamp Life Remaining, Total Controller Runtime | ![]() |
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UV Intensity Monitor | No - See Sterilight Cobalt Plus Series | |||
Powered Solenoid Output | Optional | |||
Sterilight SC-200 |
Sterilight SC-320 |
Sterilight SC-600 |
Sterilight SC-740 |
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Price Switch to US pricing |
Discontinued
See Viqua VH200 for replacement |
Discontinued
See Viqua VH410 for replacement |
Discontinued
See Viqua VP600 for replacement |
Discontinued
See Viqua VP950 for replacement |
Sterilight SC-200 | Sterilight SC-320 | Sterilight SC-600 | Sterilight SC-740 |
*Note: Maximum recommended flow rates based on 95% UV transmittance. Actual dosage depends on flow rate, water quality, and maintenance (cleaning of UV sleeve). UV dosage will be lower when the UV transmittance capacity of the water drops below 95% - if in doubt, select a model rated for a higher flow rate than you actually require. We recommend a UV dose of 40 mJ/cm2.
Feed Water Quality Parameters | |
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Iron | 0.3 ppm (0.3 mg/L) |
Manganese | 0.05 ppm (0.05 mg/L) |
Tannins | 0.1 ppm (0.1 mg/L) |
Turbidity | < 1 NTU |
Hardness | < 120 ppm (7 grains / gallon) |
UV Transmittance (UVT): | 75% |
Maximum Temperature: | 104F (40C) |
Maximum Pressure: | 125 psi |
Pre-treatment Requirements:
All UV sterilizers required sediment pre-filtration to reduce or eliminate the possibility that a targeted contaminant could "hide" behind a sediment particle in the "shadow" of the UV light and therefore not receive a full dose of UV light. Accordingly, the manufacturer strongly recommends sediment pre-filtration down to a level of 5 microns or smaller.
Water exceeding 120 ppm in hardness (7 grains per gallon) should be softened to reduce the risk that hard water mineral scale will build-up on the UV sleeve thereby reducing UV light distribution into the UV chamber. Similarly, iron levels exceeding 0.3 ppm or manganese levels exceeding 0.05 ppm should also be treated to prevent staining of the UV sleeve.
Elevated levels of certain other contaminants, such as tannins, can cause a reduction in UV transmittance (the ability of the water to transmit UV light). If the UV transmittance (UVT) of your water is less than 75% after the above-mentioned pre-treatment, activated carbon filtration may be desirable to improve UV transmittance. The majority of deep wells have a UVT of 85% or greater. If your UVT is unknown, select a model with a higher flow rate capacity then you feel you will really require (this will provide a higher UV dose at your desired flow rate), or add an activated carbon pre-filter to your system. We recommend the following pre-filter equipment:
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WH1B+ 5 Micron Sediment Pre-Filter Package excellent overall sediment pre-treatment to 5 micron level |
WH2 Sediment & Activated Carbon Pre-Filter Package sediment pre-treatment to 5 microns and improves UV transmittance by removing tannins and other contaminants that reduce UVT |
WH5 Iron Reduction Filter Package very cost effective iron pre-treatment filter for iron levels ranging from 0.3 to 5.0 ppm |
Recommended Accessories:
![Sterilight Temperature Management Valve](images/temperature-management-valve.jpg)
Temperature Management Valve
The Sterilight Cobalt Series can be equipped with a temperature management valve to regulate water temperature within the unit due to the high output lamp. The Sterilight temperature management valve is designed to release heated water from the unit during periods of low flow. It comes complete with 12' of 1/4" flexible drain line.
Flow Restrictors
The Sterilight Cobalt Series can be equipped with a flow restrictor to ensure that you do not exceed the maximum flow capacity of the system. We recommend that you choose a flow restrictor rated for slightly less flow than the UV sterilizer based on a UV dose of 40,000 μWs/cm2. For more details, review our flow restrictors page.