NK TECHNOLOGIES AT Series Instructions

Specifi cations
Power Supply 24 VDC nominal, 40 VDC max
Overvoltage CAT I, Class 2 or power limited
power supply
Input Range Field selectable from 0-2000 A
300 V line to neutral, CAT III
Output Signal 4-20 mA, loop powered
Output Limit 23 mA
Accuracy 1.0% FS
Measurement True RMS or average responding
Frequency Range ATR: 10-400 Hz
AT: 50-60 Hz, sinusoidal
Isolation Voltage Tested to 3 KV
Response Time 500 ms (to 90% of step change)
Sensing Aperture 3.0" (76 mm) diameter
Case UL94 V-0 Flammability rated thermoplastic
Environmental -4 to 122°F (-20 to 50°C) operating ambient
temperature
0-95% RH, Non-condensing
Pollution Degree 2
Altitude to 6561 ft (2000 meters)
Listings UL and cUL listed
CE certifi ed
RoHS compliant
Power Supply
Minimum Power Supply = 12 VDC + Total Loop Voltage Drop
32 V
LOOP
22 V
POWER
(VDC)
12 V
0 250 500
Total Loop Impedance (Ohms)
Warning! Risk of electric shock or per-
sonal injury
Safe operation can only be guaranteed if the
transducer is used for the purpose for which
it was designed and within the limits of the
technical specifi cations. When this symbol
is used, it means you should consult all
documentation to understand the nature of
potential hazards and the action required to
avoid them.
Warning! Risk of hazardous voltage
When operating the transducer, certain parts
may carry hazardous live voltage (e.g. pri-
mary conductor, secondary terminals). The
transducer should not be put into service if
the installation is not complete.
Model Number Key
AT R 3 - 420 - 24L - FL
RANGE
2 -
3 - 375, 500, 750 A
4 - 1000, 1333, 2000 A
Measurement
R -
(Blank) - Average Responding
SENSOR TYPE:
AT - AC current sensor, 4-20 mA output
loop powered
Operating
Know Your Power
Range
750 1000
Other NK Technologies Products Include:
AC & DC Current Transducers
AC & DC Current Operated Switches
1 & 3Power Transducers
Current & Potential Transformers (CTs&PTs)
3511 Charter Park Drive, San Jose, CA 95136
Phone: 800-959-4014 or 408-871-7510
Fax: 408-871-7515
sales@nktechnologies.com, www.nktechnologies.com
CASE STYLE
FL - Solid-Core
POWER SUPPLY:
24L - 24 VDC Loop Powered
OUTPUT:
420 - 4-20 mA
100, 133, 200 A
True RMS
INSTRUCTIONS
AT & ATR 2, 3 & 4 SERIES
AC Current Transducers
4-20 mA Output
True RMS or Average Responding
Quick "How To" Guide
1. Run the wire you are monitoring through aper-
ture.
2. Mount the sensor to a surface if needed.
3. Connect output wiring.
A. Use 14-22 AWG 75˚C minimum copper con-
ductors only and tighten to 5 inch-pounds
torque.
B. Make sure output load does not exceed product
specifi cations.
C. Connect 24 VDC power supply and load in
series.
4. Select Range
A. Choose correct range by positioning the Range
switch.
292001301 Rev 4