1. (a) An ultraviolet (UV) system shall continuously monitor and display locally at the system control panel the following:

   1. (1) the flow rate in each disinfection channel;
   2. (2) the relative intensity of a lamp in one bank of a disinfection channel;
   3. (3) the operational status and condition of each bank;
   4. (4) the on/off status of each lamp in the system;
   5. (5) the number of operating hours of each bank in the system; and
   6. (6) the total number of hours of operation for each bank in the system.
2. (b) Flow pacing shall be accomplished by turning the appropriate number of banks on or off in proportion to effluent flow. Set points used to energize the banks shall be operator adjustable.

3. (c) A UV system must include an alarm system.

   1. (1) A facility that is not supervised 24-hours per day must have telemetry with battery backup as part of the alarm system. A telemetry system must notify a facility operator in the event of a UV alarm.

   2. (2) A UV system must include the following minimum alarm conditions:

      1. (A) A minor alarm must activate if:

         1. (i) the relative UV intensity of the system is less than 45%; or
         2. (ii) there is a lamp outage.

      2. (B) A major alarm must activate if:

         1. (i) the relative UV intensity of the system is less than 25% (after 100 hour burn in);
         2. (ii) more than 10% of the lamps fail;
         3. (iii) there is a loss of flow signal upon failure of a bank to energize; or
         4. (iv) there is an outage of any module or bank.

Source Note:The provisions of this §217.294 adopted to be effective August 28, 2008, 33 TexReg 6843.