Sinvest VGE Blue Lagoon BL220 Manual Del Usario página 12

• During normal operation you can see the offset (by pressing [-]) and gain (by pressing [+])
EN
values, to check the status of the electrode. The ideal values are an offset close to zero and
a gain close to 1.000. When these values are close to the max / min limits (offset: -1.00pH ...
+1.00pH; gain: 0.750 ... 1.500), it means that the electrode is contaminated or dead.
Redox calibration
1. Rinse the redox electrode with distilled water, then immerse it in the calibration solution (220
mV)
2. Wait a few seconds for the system stabilization
3. Press and hold the [-] key until the message "OFS" (OFFSET calibration) is displayed
4. Press ON/OFF to confirm the calibration or wait for a few seconds for exiting without saving and
keeping the previous calibration
Notes
• The redox calibration is a single point procedure (offset). However, pressing the [+] key the
system enters the GAIN calibration, but this will not have any effect.
• During normal operation you can see the offset value (by pressing [-]),to check the status of the
electrode. The ideal value is an offset close to zero. When this value is too close to the max / min
limits (-100mV ... +100mV), it means that the electrode is contaminated or dead.
MAINTENANCE
Regular maintenance is essential if the pump has to give good service over a long period. The
following advice should be strictly followed.
Weekly operations:
• Check the level of the liquid to be dosed to avoid the pump working dry
• Check that in the suction and injection pipes there are no impurities
• Check the filter clogging, which may cause the decrease of flow rate
Operations every three months (or in case of pump drifting):
Cleaning: clean all parts that are in contact with the dosed chemical (pump body, foot filter and
injection valve).
If using additives that form crystals, clean more frequently. Proceed as follows:
• Immerse the suction tube and foot filter into a tank containing clean water
• Start the pump for a few minutes to let the water pass through the pump body
If there are crystals to be removed, proceed as follows:
• Replace the water with an adequate chemical (e.g. hydrochloric acid for sodium hypochlorite
crystals) and let the pump work for a few minutes
• Repeat the operation with clean water
12 | BL220 PERISTALTIC PUMPS
Before any operation, make sure the system is unplugged!