AMETEK National Controls Corp. • 1725 Western Drive • West Chicago, Illinois 60185 • Tel: 800-323-2593 • 630-231-5900 • FAX: 630-231-1377 • www.nationalcontrols.com
2-6
Resistance Sensors (Dual Probe)
Models NS129, NS132 and NS139
FEATURES
100% functionally tested
Solid state sensing circuitry
Isolated UL Class ll sensing voltage
Adjustable sensitivity by Trimpot
#6 screw terminal connections
Conformal coating to protect circuit
from harsh environments
File #E61377
Operating Logic: In Models NS129 and
NS139 (Pump Down) the output relay is de-
energized until the liquid reaches the high
probe. When liquid touches the high probe,
the output relay is activated until the level
drops below the low probe.
In Models NS132 (Pump Up) the output
relay is energized until the liquid reaches
the high probe. When the liquid touches the
high probe, the output relay is deactivated
until the level drops below the low probe.
If the tank is non-conductive, a third
(common) probe must be installed at a level
where it will always be submerged.
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SPECIFICATIONS
CONTROL TYPE
On/Off Resistance Sensing:
NS129 and NS139: Probe resistance below set
point activates relay
NS132: Probe resistance above set point acti-
vates relay
Sensing Voltage: 15 VAC, max. RMS
Sensing Current: 2.0 mA, max. RMS
Sensitivity Adjustment: Adjustable by a Trimpot
from .1-100 K ohms +10%, -0%
INPUT
Operating Voltage: 120, 240 VAC, ±10%
Power Consumption: 11 VA max. for 120 VAC
units
Frequency: 50/60 Hz
OUTPUT
Type:
NS129 and NS132: Relay contacts SPDT
(1 Form C)
NS139: Relay contacts DPDT (2 Form C)
Rating: 10 A resistive at 120 VAC; 5 A resistive at
240 VAC; 100 mA at 5 VDC min. load current
Life:
Mechanical: 10,000,000 cycles
Electrical: 100,000 min. at full load
PROTECTION
Isolation: 1500 VAC between probe and other
terminals
MECHANICAL
Terminations: Terminal blocks with #6 screw
connections
Mounting: 4-.141” dia. mounting holes
ENVIRONMENTAL
Operating Temperature: -20°C to 55°C
LIQUID LEVEL CONTROL SERIES
NS129, NS132
2.12
3.00
To probes
and tank
3.62
4.00
(4) .14 Dia
Mounting Holes
Isolated Relay
Output Input
Voltage
1.75
Sens.
Adjust
Increase
N.C. N.O. COM.
L1 L2
L H C
(3673-1)
.19
.44
(3673-2)
1.75
Increase
Adjust
Sens.
2.62
3.00
Mounting holes
(4) .14 Dia
NS139
N.C. N.O. COM.
Output
Isolated Relay
N.C. N.O. COM.
Voltage
Input
Output
Isolated Relay
and tank
To probes
L
H
C
4.62
5.00
L1 L2
.19
.19
L
To conductive tank
High Probe
.
Low Probe
Typical Probe Connection
To Level Control
C
H
ORDERING INFORMATION
LOGIC TYPE INPUT VOLTAGE PART NUMBER
Pump Down 120 VAC LNC-NS129-120
Pump Down 240 VAC LNC-NS129-240
Pump Down 120 VAC LNC-NS139-120
Pump Up 120 VAC LNC-NS132-120
Pump Up 240 VAC LNC-NS132-240
ACCESSORY PART NUMBER
Probe Holder with Ground LLH-11383-010
Probe, 6” Long, 1/4” Dia., S.S. LLP-06.00-OSS
Probe, 12” Long, 1/4” Dia., S.S. LLP-12.00-OSS
Probe, 24” Long, 1/4” Dia., S.S. LLP-24.00-OSS
Probe Assembly, Plastic Body LLP-001/2-011
