UV dose vs. flow

Calculated dose RED = Kc·(S/S0)·G(UVA)/Q (US EPA UVDGM calculated-dose form) for the TrojanUVSwiftSC D12 at the live UVT and lamp age with clean sleeves: at 100 % ballast power (solid) and at the live setpoint (dashed); grey: 100 % at the minimum validated UVT. Red: required 40 mJ/cm² (DVGW) and the validated flow limit. Dots: dose the controller reports from the lower UV sensor.

Twin, 100 % powerTwin, live setpointTwin, UVT at minimumMeasured (trail)

UV intensity over lamp life: expected vs. measured

Expected sensor intensity = S0 × lamp power fraction × age factor (linear to 0.80 at 12,000 h) × clean sleeve 0.97 × 10^(−UVA·3 cm), at the live power and UVT. Dashed: the fouling alert (0.85 × expected). Dots: mean of the two UV sensors.

Expected (twin)Fouling alertMeasured (trail)

UV disinfection train

Filtered water through the flow meter and the UVT sample point into the UV reactor (12 lamps, two UV sensors, wiper), out to the clear-water tank; ballasts in the control panel. Red = beyond the twin's alarm limit.

Condition sensors

Bars against the alarm limits in the twin file (red line).

Twin health: expected vs. actual

Measured vs. expected