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20
OWL Data Loggers
4.4
Specifications
Current Probes
Output Current:
Cable:
Accuracy:
Ranges:
4.5
Trouble-shooting
The OWL Electric Current logger seems to give wrong readings. What's wrong?
· If the graphs seem incorrect, check the equation number assigned to the graph file. This equation
number must correspond to the model number of the current probe used. Refer to Table 3-2 for
equations to use with the various current probes.
· If the equation numbers are correctly assigned and the measurements are still incorrect, it may be
caused by poor resolution. To correct this, make sure the current range setting is the lowest
possible that will encompass the readings. For example, do not use the 250 amp range on the
A60FL or A65FL current probe for recording values below 25 amps. Use the 25 amp setting instead
(it offers ten times the resolution of the 250 amp range).
4.6
Applications
· checking air conditioning and mechanical equipment
· auditing energy use in commercial buildings
· determining tenant electrical consumption
· tracking environmental conditions
· confirming control sequences
260 µA full scale into 400 ohms.
6 ft. (2m) length with PVC jacket to IP67 connector.
2.5% of full scale.
The following table lists the usable range available for each setting.
Table 3-3. Current Probe Usable Ranges
A60FL / A65FL
Equation 206
Switch
Range
5
0.5 to 5 A
25
2.5 to 25 A
100
10 to 100 A
250
25 to 250 A
A70FL / A75FL
Equation 207
Switch
Range
10
1 to 10 A
50
5 to 50 A
250
25 to 250 A
500
50 to 500 A
© 2001 ... ACR Sy stems Inc.
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