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The Sterilight SC-740 / SCM-740 Ultraviolet (UV) water sterilizers are popular and economical choices for large whole house or commercial water purification to kill bacteria (including coliform and e.coli), viruses, cryptosporidium, giardia, and a wide range of other microbioogical contaminants, where the maximum required flow rate is not greater than 30.0 gallons per minute (GPM) or 113.6 litres per minute (LPM).
The Sterilight SC-740 / SCM-740 (part of Sterilights's Cobalt Series) include many poluar convenience features including a visual "lamp on" indicator light, audible lamp failure alarm, and LED display that indicates lamp life remaining and total controller run time. They also features a stainless steel reactor chamber, a fire-polished domed quartz sleeve, and Sterilights' popular Sterilume™-HO coated low pressure germicidal UV lamp which can be easily changed without interrupting the water flow. It also incorporates Sterilight's Cobalt controller which automatically senses line voltage between 100 and 240 volts for consistent UV output and performance in varying electrical operating conditions.
The SC-740 does NOT include a UV intensity monitor and it CANNOT be connected to an emergency solenoid shut-off valve. If either of these features appeal to you, we recommend that you consider the SCM-740.
The SCM-740 is a monitored system so comes with a UV intensity monitor and it CAN be connected to an emergency solenoid shut-off valve (not included).
Sterilight SC-740 / SCM-740 Specifications |
| Applications |
whole house (Large house / Commercial) |
Max. Flow Rate
(UV dose >30,000 µWs/cm2)* |
40 GPM (151.4 LPG) |
Max. Flow Rate
(UV dose >40,000 µWs/cm2)* |
30 GPM (113.6 LPM) |
| Water Chamber Material |
304 Stainless Steel |
| Chamber Length |
39.4 inches / 100 cm |
| Chamber Diameter |
3.5 inches / 8.9 cm |
| Controller Size |
9.4 x 3.2 x 2.5 inches
(24.1 x 8.1 x 6.4 cm) |
| Lamp |
Sterilume-HO
Model S740RL-HO |
| Sleeve |
Quartz
Model QS-740 |
| Electrical |
100-240v, 50/60HZ |
| Power Consumption |
88 watts |
| Lamp Power |
80 watts |
| Inlet / Outlet Plumbing Ports |
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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| Sterilight SC-740 Basic |
Sterilight SCM-740 Plus
(with UV Intensity Monitor) |
US$709.95
+ free shipping
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US$969.95
+ free shipping
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*Note: Maximum recommended flow rates based on 95% UV transmittance. Actual dosage depends on flow rate, water quality, and maintenance (cleaning ov 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 not less than 30,000 µWs/cm2.
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:
Accessories:
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.
Recommended Temperature
Management Valve for SC-740 / SCM-740 |
|
Model |
Price |
 |
Sterilight Temperature
Management Valve (#440179)
Made of 316L stainless steel
1" FNPT connections
Includes 12' of drain line
Fully automatic |
The Sterilight SC-740 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 Sterilight flow restrictors page.
Recommended Flow Restrictors
for SC-740 / SCM-740 |
|
Model |
Price |
 |
Sterilight
FRSS-20
Flow Restrictor
20.0 GPM
Chrome
Plated
Brass
1" x1"
FNPT |
The Sterilight Cobalt SCM series can also be equipped with an emergency solenoid shut-off kit. In the event of a power failure or electrical outage to your home, your UV lamp in your UV system will lose power. This could leave your home unprotected if someone turns on a water faucet. Some bacteria and other waterborne pathogens can also swim past an un-powered UV lamp and reach the downstream portion of your water system and therefore not receive a dose of UV light once the power is restored. The same situation could occur in the event of a UV bulb failure or in the event of a reduction in UV lamp output (drop in UV intensity below safe dosage level). The solenoid emergency shut-off valve is normally installed at the output of your UV system and will physically close a valve in the event of a bulb burn-out or power failure, thereby preventing any contaminant from passing through the system untreated. This feature will also turn off the water supply if there is a UV intensity loss (for models equipped with a UV intensity monitor). This kit is highly recommend for all homes with a known bacterial, virus, or cyst contamination problem, and for all homes with an electrical supply that is prone to frequent outages. Various valve sizes are available. For more details, review our Sterilight solenoid valve kits page.
Recommended Emergency Solenoid
Shut-off Kits for SCM-740 |
|
Model |
Included Equipment |
Valve Size |
Price |
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Sterilight
SOL-PLUS-1.0
Emergency Solenoid Shut-off Kit |
kit includes:
#326015
solenoid cable
SOL-1.0
solenoid valve |
1" |
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