ACM vs ARS Motor Units


Are the two motor units equivalent for NADP/NTN purposes?

TRIAL CONSISTED OF 3 PHASES

PHASE 1 - Where the ARS box was located on the North collector with sensor "A" while the ACM box was on the South collector with sensor "B"

PHASE 2 - Where the motor boxes were switched between the two wet/dry So, the ARS box was now mated to the "B" sensor at the South collector.

and

PHASE 3- where the sensors were switched between the two wet/drys So now the "A" sensor was again with the ARS box (as in Phase1) except that both the box and sensor were on the South collector.


CAL TEST RESULTS

THE AIR RESOURCE SPECIALIST (ARS)MOTOR BOX PERFORMED WITHOUT MAJOR FAILURE (CONSIDERING IT WAS ONE OF THE FIRST ONES PRODUCED THIS WAS IN ITSELF AN ACCOMPLISHMENT).

THE ARS MOTOR UNIT DID NOT EXHIBIT ANY SERIOUS DEFECTS IN OPERATION. THE COLLECTOR FUNCTIONED IN A TOTALLY ACCEPTABLE MANNER

ANALYSIS OF THE THREE TRIALS INDICATE:

1) THE USE OF THE 48 HOURS GEAR CLUSTER ON THE RAINGAGE YIELDED ACCEPTABLE EVENT RECORDING "OPEN TIME" DATA FOR THE ANALYSIS. RESOLUTION OF THE DATA WAS ABOUT 5 MINUTES (THE 6 HOUR GEAR WAS TOO FAST).

2) THERE ARE SOME VERY SLIGHT NEGATIVE COLLECTION EFFICIENCY BIASES IN THE ARS BOX IN THE CASES WHERE THESE ARE STATISTICALLY SIGNIFICANT, THEY ARE NOT PRACTICALLY SIGNIFICANT GIVEN THE RANGE OF TRIAL SAMPLE VOLUMES AND THE NETWORK MEAN SAMPLE VOLUME.

3) THE BIAS OF THE "OPEN TIME" DATA AND SOME OF THE TESTS FOR SAMPLE VOLUME INDICATE THAT SENSOR (B) POSITION DROVE THE DIFFERENCES. THERE WAS SOME INDICATION THAT THE ARS MOTOR BOX DID CAUSE THE SAMPLER TO BE OPEN LONGER LACK OF MORE PHASE III DATA IS A CONCERN

4) THE ARS BOX SEEMS TO BE EQUIVALENT TO THE ACM BOX.

5) NO PERFORMANCE INCREASE WAS DOCUMENTED WITH THE ARS BOX.


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