(a) An ultraviolet (UV) system shall continuously monitor and display the following information on the system control panel:
  (1) the flow rate in each disinfection channel;
  (2) the relative intensity of the lamps in one bank of a disinfection channel;
  (3) the operational status and condition of each bank;
  (4) the on or off status of each lamp in the system;
  (5) the number of operating hours of the lamps in each bank in the system;
  (6) the total number of hours of operation for each bank in the system; and
  (7) the transmissivity of UV light in the disinfection channel.
(b) Flow pacing is required and shall be accomplished by automatically turning the appropriate number of banks on or off in proportion to effluent flow. Set points used to energize the banks must be adjustable.
(c) A UV system must include an alarm system.
  (1) A wastewater treatment facility that is not supervised 24-hours per day must have a telemetry system with battery backup as part of the alarm system. A telemetry system must notify a wastewater treatment facility operator in the event of a UV alarm and must distinguish between major and minor alarms.
  (2) A UV system must include the following minimum alarm conditions:
    (A) A minor alarm must activate if:
      (i) the UV intensity of the system is less than 45%, relative to the peak intensity after 100 hour burn in; or
      (ii) there is a lamp outage.
    (B) A major alarm must activate if:
      (i) the UV intensity of the system is less than 25%, relative to the peak intensityafter 100 hour burn in;
      (ii) more than 10% of the lamps fail;
      (iii) there is a loss of flow signal upon failure of a bank to energize;
      (iv) there is an outage of any module or bank; or
      (v) the transmissivity is low, based on the manufacturer's recommendations.

Source Note: The provisions of this §217.294 adopted to be effective August 28, 2008, 33 TexReg 6843; amended to be effective December 4, 2015, 40 TexReg 8254