Current Probes And Accessories; Specifications - ACR Electronics SmartReader Plus Reference Manual

1.5.4

Current Probes and Accessories

Each SmartReader Plus 3 has four pairs of input connections for use with the Current Probes
from Amprobe Instruments. These clamps can be used with a number of accessories to fit
most typical applications.
Low Currents
To log very low currents (such as monitoring the operation of electrical appliances), the probe
can be used with a Line Splitter. The Amprobe A47L Energizer multiplies the signal to the
logger by ten times over a range of 0.1 to 15A. It also allows effective splitting of a two-line
conductor, allowing measurements without the need to enter electrical panels or junction
boxes.
For European applications, Amprobe's model A47CL is available with screw-in European
round prongs, two extra British-type prongs and a British fuse plug adapter. Contact your local
ACR representative for pricing and delivery of this product.
High Currents
You can monitor current ranges higher than those available on a standard probe by using it
with an additional transformer. For this purpose Amprobe Instruments has available their
Amptran® CT50-2 a 50-to-1 transformer (to monitor currents up to 3000 amps). Contact your
ACR representative for availability of this probe.
Extending Probe Lead Lengths
The lead length of the Amprobe probes can be extended by splicing in up to 225m (750 ft.) of
2-conductor 18-gauge copper wire.
1.5.5

Specifications

Current Channel Ranges:
Voltage Channels:
Input Impedance:
Accuracy
Current Channels:
Voltage Channels:
Copyright © 2010 ACR Systems Inc. All Rights Reserved.
SmartReader Plus Data Logger
With A60FL / A65FL current probes: 5, 25, 100, 250 Amps
With A70FL / A75FL current probes: 10,50, 250, 500 Amps
To monitor current ranges up to 3000 Amps, the CT50-2
probe (a 50 to 1 current transformer) can be used in
conjunction with the A60FL or the A70FL.
0-5 V DC
Typically > 1 M Ohms
±3.0% of full scale above 10% of range
±0.5% of full scale
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