NK TECHNOLOGIES AT 2 Series Instructions

Specifi cations
Power Supply 24 VDC nominal (12-32 VDC)
100 VA maximum or Class 2
Input Range 0-200, 0-300 and 0-400 A
(See Model Number Key)
Output Signal 4-20 mA, Loop powered
Output Limit 28 mA
Accuracy 1.0% FS
Measurement True RMS or Average Responding
Frequency Range ATR: 20-400 Hz
AT: 40-400 Hz, Sinusoidal
Isolation Voltage UL listed to 500 VAC
Response Time ATR Models: 1.4 sec max
AT Models: 0.30 sec
(10-90% of step change)
Sensing Aperture 1.30" (33.0 mm) diameter
Environmental -20 to 50°C (-4 to 122°F)
0-95% RH Non-condensing
Pollution Degree 2
Altitude to 6561 ft (2000 meters)
Listings UL/cUL, CE
RoHS compliant
For products intended for the EU market, the following
is applicable to the CE compliance of the product:
The AT and ATR-FD series comply with EN 61010-1 CAT
III 300 Vrms max line-to-neutral measurement category. If
insulated cable is used for the primary circuit, the voltage
rating of the measurement category can be improved ac-
cording to the insulation characteristics given by the cable
manufacturer.
Warning! Risk of danger
Safe operation can only be guaranteed if
the transducer is used for the purpose it was
designed for and within limits of the technical
specifi cations. When this symbol is used, it
means you must consult all documentation to
understand the nature of potential hazards and
the action required to avoid them.
Warning! Risk of shock
When operating the sensor certain parts may
carry hazardous live voltage (e.g. primary con-
ductors, power supply). The transducer should
not be put into operation if the installation is
not complete.
Model Number Key
AT R 3 - 420 - 24L - FD
CASE STYLE:
FD - Solid-core, DIN or
POWER SUPPLY:
24L - 24 VDC Loop Powered
OUTPUT:
420 - 4-20 mA
RANGE:
2 - 200 A
3 - 300 A
4 - 400 A
Measurement
R - True RMS
(Blank) Average Responding
SENSOR TYPE:
AT - AC current sensor, 4-20 mA output
loop powered
Know Your Power
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
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 aperture.
2. Mount the sensor to a DIN rail or panel, or suspend from
wire with cable ties.
3. Connect output wiring.
A. Use 30-12 AWG copper conductors only rated
minimum 75°C and tighten to 5-7 in-lbs torque.
B. Make sure loop impedance does not exceed product
specifi cations. See graph below.
C. Connect 24 VDC power supply, sensor and load
(PLC, panel meter, etc.) in series.
4. Energize monitored circuit.
A. 4 mA output shows zero current, 20 mA represents
current at full range.
292000071 Rev 5