Electronic Sensor Operated Fixtures

Coordinate with your Client and verify how each fixture will be used and inform him or her of the available options.

AC VERSUS DC – PROS & CONS

Battery Pros:

1. Do not require emergency power during power failure.

2. Low installation cost compared to hard-wired.

3. Retrofitting existing fixtures is less disruptive and less expensive than hard-wired.

Battery Cons:

1. Requires regimented maintenance program to insure that batteries are replaced prior to becoming depleted. Accurate records must be maintained to document all sensor locations and dates of installation. This can become labor intensive.

2. Complexity of monitoring battery life increases relative to the quantity of sensors installed.

3. Battery failure will result in unsanitary conditions and user complaints.

AC Power Pros:

1. Negates issues related to monitoring, replacement and failure of batteries.

2. More reliable than battery power.

AC Power Cons:

1. Requires emergency power to operate during power outages.

2. High installation cost compared to battery powered.

3. Retrofitting existing fixtures is more disruptive and expensive compared to battery powered.

RECOMMENDATIONS

1. Specify AC powered sensors for high-use fixtures in sports stadiums, convention centers, etc.

2. Specify AC powered sensors connected to an emergency power source for fixtures that serve crucial areas such as medical scrub sinks, critical patient care sinks, essential research lab sinks, etc.

3. Specify manual type flush valves in lieu of electronic sensors for patient toilets to avoid interference with bedpan washing.

4. Specify a manual override button on all sensor operated flush valves.

5. Insure that faucet sensor timers will not stop the flow of water too soon. ( I.E., A 10 second cycle will not be adequate for a Nurse’s hand wash sink).

6. Insure that hot water is readily available at each sensor operated faucet. Conventional recirculated hot water system design will not allow the user to experience correct temperatures. (Consider point-of-use heaters or electric heat maintenance cable on piping).

7. Do not specify battery operated sensors for fixtures within specimen toilet rooms. If AC powered sensors are selected, provide a means for staff to control the power remotely.

8. Use common sense. Do not specify automatic sensor operated faucets where user requires control of water flow. (I.E., shaving, brushing teeth, cleaning equipment, etc.).