NATIONAL CONTROLS NS129 User Manual

2-6

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 Connectio

n

To Level Contro

l

C

H

LIQUID LEVEL CONTROL SERIES

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 de­energized 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.

SPECIFICATIONS

CONTROL TYPE

On/Off Resistance Sensing:

NS129 and NS139: Probe resistance below set
point activates relay
NS132: Probe resistance above set point acti­vates 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

ORDERING INFORMATION

Pump Down 120 VAC LNC-NS129-120

Pump Down 240 VAC

Pump Down 120 VAC

Pump Up 120 VAC

Pump Up 240 VAC

Probe Holder with Ground LLH-11383-010

Probe, 6” Long, 1/4” Dia., S.S.

Probe, 12” Long, 1/4” Dia., S.S.

Probe, 24” Long, 1/4” Dia., S.S.

Probe Assembly, Plastic Body LLP-001/2-011

AMETEK National Controls Corp. • 1725 Western Drive • West Chicago, Illinois 60185 • Tel: [phone] • 630-231-5900 • FAX: [phone] • www.nationalcontrols.com

LOGIC TYPE INPUT VOLTAGE PART NUMBER

ACCESSORY PART NUMBER

LLP-06.00-OSS

LLP-12.00-OSS

LLP-24.00-OSS

LNC-NS129-240

LNC-NS139-120

LNC-NS132-120

LNC-NS132-240