Monitoring of UVC intensity with switching function Operating Power Detection - OPD 2
The OPD 2 evaluation unit controls service life according to the UVC rate. The level of service life is indicated by LEDs. In addition, every LED is pictured by a potential-free contact being implemented as a changeover contact. These contacts may be used for external signaling or switching operations.
Technical data of the monitoring unit
|Voltage supply:||230 V AC (110 V AC, 24 V DC or 12 V DC possible)|
|Input||Input signal from SiC-UV-sensor|
|Steady light (green LED)||at > 70% of starting intensity|
|Pre-alarm (yellow LED)||at < 70% of starting intensity|
|main alarm (red LED)||at < 50% of starting intensity|
|red LED blinking||No sensor, faulty Sensor|
|green LED blinking||Cable break, faulty measurement amplifier Overdriven or faulty measurement amplifier|
|Additional function||Potential-free contact of every LED implemented as a 100 mA changeover contact|
With this option, light output is directly measured by a sensor. As soon as the service voltage is on, the unit starts seeking sensor figures in a cyclical way. Previously, however, the start-up process is implemented. Red, yellow and green LED's will be flashing one after another for 1 second. This enables to control the LED's functioning. In addition, a specific interruption of the procedure enables the unit's referencing to the sensor's current measuring value. In that case the start-up procedure must be interrupted twice in a row by specifically disconneting the OPD during the yellow phase. During its subsequent connection, the current sensor value (light output) will be saved in non-volatile way in the EEProm as a reference value (100%). Referencing will be confirmed by a single blinking of the green LED. Thereafter, the green LED must light up. The system has been referenced anew. Two thresholds (Pyellow/P100% in %, as well as Pred/P100% in %) may also be saved in the unit's EEProm. If the current sensor's measuring value is P > Pyellow, the green LED will light up. In case the current measuring value falls short of this threshold, the yellow LED will be activated. Should the second Pred threshold fall short, red would be signaled. If no measuring value can be established, the red LED will be blinking and so signaling a faulty device. Its causes could be the following: no sensor is on; a faulty sensor; cable breaking or a short-circuit; a faulty measurement amplifier of the device. Should the green LED blink, the measurement amplifier would be either overdriven or faulty. A faulty reading might threfore result.
DOWNLOAD PURION® data sheets
- data sheet OPD 2.pdf(411 Kb)