AUTOMATIC PORTABLE CURRENT METER MODEL:AEM 1-D
BRAND:STANLEY S / No:456
MANUFACTURER:ALEC ELECTRONIC Co., LTD Made in Japan
FOR MANUAL CURRENTMETER As we know,the current meter is used to measure the
velocity at a point in the flow cross-section.It consist s essentially of a rotating element which rotates due to the reaction of the stream current with angular velocity proportional to the stream velocity. The typical relationship: v = aNs + b v = stream velocity at the instrument lovation in m/s Ns = revolutions per second of the meter a,b = constants of the meter
For standard size 12.5 cm diameter Price meter(cup
type): a=0.65 , b= 0.03 For smaller meters of 5 cm diameter cup: a= 0.30 , b= 0.003 For value of revolutions per second of the meter: Ns = 0.002 m/sec
THE COMPONENT OF CURRENTMETERCurrent meter-reading the velocity
Censor-detect the water velocity
Propeller-prevent the stream flow of water.
Electrical connection-Supply power
The arrow must be parallel to the censor
-Average time is how long the current meter can be in water.Average time
OPERATIONAL MECHANISM Assemble all of the current meter segment such as
propeller,censor,holder connecter and electrical connection. Make sure that the error from the holder is parallel to the censor device. Switch on the current meter. Before taking the reading of current meter, rezero the meter. Make sure that the censor was in a calm water before rezero the meter. Two ways to rezero: -set 0.0000 -Adjust zero Read the value of velocity from the current meter.
REFERENCES: http://www.jfe-alec.co.jp/html/aem1-de.htm http://www.google.com.my/url?sa=t&rct=j&q=aem1-
d&source=web&cd=8&ved=0CFUQFjAH&url=http%3A%2F%2Fwww.c andv.co.kr%2Fdata%2FAEM1D.pdf&ei=FqrdTrLmC4fyrQfTidnUCA&usg=AFQjCNExgWLOvB27Ks Ml9MtFS6UnmR-AOA
Hydrology Reference Modul
