Siemens interranger DPS300 Instructional Manual page 20

Moving or Travelling Bridges
scum
trough
For clarifiers with these types of arrangements, care must be taken in choosing a
mounting location. The following items should be considered when choosing a
location on the bridge:
•
The transducer should be mounted behind (after) the surface skimmer (if present).
This is to help minimize the amount of potential scum build-up on the transducer.
•
The transducer should be mounted in front of the bottom scraper mechanism.
The sludge becomes very disturbed after the passing of a bottom scraper and a
clean interface will be difficult to detect. Mount the transducer in front of the
scraper, not behind.
•
The transducer should not be mounted near any siphoning-type outlet.
Some clarifiers utilize a siphoning technique to maintain sludge levels. Do not
locate the transducer near these outlets as the sludge is more disturbed there.
•
Ensure the transducer will not come into contact with effluent weirs or scum
troughs at either end of the bridge travel.
It is important to observe the bridge motion through at least one complete cycle to
ensure that the transducer and/or the mounting assembly will not collide with any
structures in the tank.
Location
An average sludge level reading will be displayed for the location at which the
transducer is installed. This location may have to be compromised for practical
reasons, pertaining to the physical installation of the transducer, and physical or
operational characteristics of the clarifier.
We suggest these examples:
Skimmers
Where surface skimmers are in use, the optional Skimmer Guard should be used
to protect the transducer and from passing skimmers.
InterRanger DPS300
bridge movement
skimmer
20
handrail
mounting
location
travelling
bridge
7ML19981BC01
effluent
weir