Territory Stories

Electronic Data Collection and Analysis System

Details:

Title

Electronic Data Collection and Analysis System

Creator

Yin Foo, Des; Foley, Margaret

Collection

E-Publications; PublicationNT; E-Books; Report ; 39/1992

Date

1992-08-01

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:1992-08

Language

English

Publisher name

Power and Water Authority

Place of publication

Darwin

Series

Report ; 39/1992

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/229024

Citation address

https://hdl.handle.net/10070/673447

Page content

Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 39 of 192. 'The magnitude of the variations (ie. the "scatter") due to physical vi:::Jrations which may be detected also depends on the logging system. The scatter was large for systems which take instantaneous readings (including Mindata, Torrens I Unidata), but much less apparent for the Wesdata system. This is a virtue of the Wesdata logging system which effectively avera'Jes a reading over a full second. Figure 3.7 is a compar.ison of the logged data types monitoring pumped bore drawdown. 'rhis .is explained since most transducers convert varying pressure to resistance, which is then conveted to a signal. In the case of 4-20mA transducers, the current is sampled almost instantaneously (about 300 microseconds) by the logger. However the \iesdata transducer converts the resistance to a frequency signal which is "counted" by the logger over one second. i't number of set-up configurations were separately investigated to reduce the effects of the pump vibrations including : (i) Placing the transducer at different depths relative to the pump ( from 2m below the inlet to 4m above it ), (ii) perforating the transducer conduit, (iii) Centralising the pump column, (iv) Elect:ric Filtering which involved adding a capacitor and coil to the transducer/logger circuit and (v) Physical filtering which involved the installation of a fine mesh on the transducer as a buffer. The confi.gurations above were trial led and did not indicate that any particular technique significantly reduce the scatter of logged water level data from the pumped bore.