Clean The Instrument - OTT Flo-Dar Manual Del Usuario

1. Look for corrosion or damage that can let environmental gases into
the interior of the sensor.
2. Make sure that no swelling, blistering, pitting or loss of material has
occurred on the upper and lower portions of the main plastic
enclosure, the depth module or the radome.
3. If the extended depth sensor is used, examine the enclosure and the
four ¼-20 stainless steel bolts.
4. If the surcharge velocity sensor (SVS) is used:
a. Make sure that the unit is not corroded and the labels can be
read.
b. Examine the cable connectors for any damage or corrosion.
Tighten all the connectors in the system.
5. Examine the cable connectors for any damage or corrosion. Tighten
all the connectors in the system.
6. If corrosion is found on the cable connectors, clean and dry the
connectors to make sure that no moisture is on the connector pins. If
corrosion is severe, replace the cables. Refer to
on page 21.

Clean the instrument

D A N G E R
Explosion hazard. Never attempt to wipe or clean the Flo-Dar or SVS
sensor while in a hazardous location. Do not use abrasives or high-
pressure hoses or washers to clean the sensors. Do not disturb the
pressure port on the bottom of the sensor.
Regular cleaning is not necessary because the sensor does not contact
the flow unless a surcharge condition occurs. Examine the sensor after a
surcharge to see if cleaning is necessary.
Item to collect: Retrieval pole with hook (optional)
1. Remove power to the sensor.
2. Put the hook on the retrieval pole to remove the sensor without
manhole entry. Make sure the grounding strap is on the pole.
3. Hook the bail on the sensor and turn the pole counter-clockwise to
unlock the sensor from the frame. Remove the sensor.
All manuals and user guides at all-guides.com
Replace a cable
4. Remove any debris from the bottom of the sensor. Clean the external
surface of the sensor with mild soap and rinse with water.
5. If the surcharge velocity sensor (SVS) is used, use 600 grit sand
paper on the electrodes (small black dots). Use only light pressure or
the electrodes will become damaged.
6. Lower the sensor on the frame. Make sure that the cable points
toward the center of the manhole.
7. Turn the retrieval pole clockwise to engage the locking bars into the
frame.
8. Apply power to the sensor.
Replace a cable
If corrosion is severe on a cable connector(s) or a cable has damage,
replace the cable.
1. Disconnect power to the sensor at the logger or controller.
2. Put the hook on the retrieval pole to remove the sensor without
manhole entry. Make sure that the grounding strap is on the pole.
3. Hook the bail on the sensor and turn the pole counter-clockwise to
unlock the sensor from the frame. Remove the sensor.
4. Remove the two Phillips screws on the sensor handle to remove the
cable clamp. Remove the cable.
5. Install the new cable. Make sure that the connector is aligned
correctly and that no debris or water gets into the connector.
6. Install the cable clamp.
7. Lower the sensor on the frame. Make sure that the cable points
toward the center of the manhole.
8. Turn the retrieval pole clockwise to engage the locking bars into the
frame.
9. Apply power to the sensor through the logger or controller.
English 21