user manual

Page 37
MSL600
Installation, Operation & Maintenance Manual
IP262/Z0, Rev. AB
February 2012
7.9 Engineering parameters
The MSL600 blanket echo processing algorithm has been optimised for use on various types of municipal and
industrial sludge. The user can select from either of two municipal sludge types depending on the application.
The following parameters have been extensively tested and, once MUNICIPAL 1 or MUNICIPAL 2 sludge types
have been chosen, the user should not need to adjust them. However, different sludge types have widely
varying ultrasonic properties and settling characteristics, therefore the following parameters are adjustable in
order that the MSL600 can be set up for different types of sludge.
Note:
It is strongly recommended that if the default parameters do not give reliable operation, or if use on industrial
sludge is required, then advice is sought from Mobrey Measurement Customer Support.
7.9.1 Alg. Select – P620
Use this parameter to select an algorithm which is optimised for municipal or industrial sludge.
The allowed options are:
• Municipal 1 (This covers most Municipal Wastewater applications e.g. Primary and Secondary settlement
tanks, Picket fence thickeners)
• Municipal 2 (This covers Industrial applications such as Industrial effluent final settlement, clarifiers, slurry
settlement etc.)
The default is Municipal 1. After selecting the algorithm to use, there are a number of common algorithm
parameters which can be adjusted using the HMI.
7.9.2 Common algorithm parameters P621 to P629
Common algorithm parameters affect the way in which both Municipal 1 and Municipal 2 algorithms work.
7.9.2.1 Ave. Cyc Count – P621
The number of cycles, in powers of 2 over which the unit will average raw sonar echo profiles to remove any
spurious reflections from such things as air bubbles and floating solids.
Since a complete measurement cycle takes 2 seconds then the averaging cycle count can effectively damp the
noise over a period between 4 seconds and 2048 seconds(or 34 minutes, which is a substantial proportion of a
rotation of most bridges).
The default value is 128 cycles. The minimum is 2 and the maximum is 1024.
Parameter values:
Default Min Max
128 2 1024