NATIONAL CONTROLS NS210 User Manual

LIQUID LEVEL CONTROL SERIES

L2 L1

LOW

HEAT FILL

C

To Probes

and Tank

3.50

4.00

2.25

1.25

4.50

5.00

.25

.25

NS210

Input

Voltage

1.75 max.

LIGHT

(5) .14 Dia

Low

Light

Heat

L H

Mounting Holes

Fill

(3672-1)

(3672-2)

PROBES

FILL

HEAT

HEAT

FILL

Input

Voltage

To Probes
and Tank

3.50

4.00

2.50

3.00

1.75

Max.

L H

To conductive

tank

High Probe
Low Probe

Heating
Element

To Level Control

L H

C

L1 L2

(4) .14 Dia

C

Mounting Holes

NS211

.25

.25

Resistance Sensors (Pump Up Logic with Heater Burn Out Protection)

Models NS210 and NS211

2-5

FEATURES

100% functionally tested

●

Solid state sensing circuitry

●

Isolated UL Class ll sensing voltage

●

1/4” male fast-ons for circuit connection

●

Conformal coating to protect circuit

●

from harsh environments

File #E61377

●

Operating Logic: Assuming an empty tank,
upon application of voltage to the system,
the fill output is turned on and the heat
er output is off. As the liquid fills the tank,
and when it reaches the low probe (above
heater), the heater output is turned on. The
level will rise until it reaches the high probe
causing the fill output to turn off. As liquid
is removed from the tank, 2 to 4 seconds
after it breaks contact with the high probe,
the fill output is turned on and stays on until
the liquid reaches the high probe. This time
delay eliminates fill output chatter if the liq
uid is splashing.
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:

On low probe: probe resistance below set
point activates heater output
On high probe: probe resistance above set
point activates fill output after a 2 to 4 sec.
delay

Sensing Voltage: 15 VAC, max. RMS
Sensing Current: 2 mA, max. RMS
Sensitivity Adjustment: Factory set at

50 K ohms ±10%

-

INPUT

Operating Voltage: 24, 120, 240 VAC, ±10%
Power Consumption: 3.0 VA max.
Frequency: 50/60 Hz

OUTPUT

Type: Relay contacts, switch loads to L1
Rating: 5 A resistive at 240 VAC
Life:

Mechanical: 5,000,000 cycles
Electrical: 100,000 min. at full load

PROTECTION

-

Isolation: 1500 VAC between probe and other
terminals

MECHANICAL

Terminations: 1/4” x .032” male fast-ons
Mounting: 4 - .141” dia. mounting holes

ENVIRONMENTAL

Operating Temperature: 0°C to 55°C

ORDERING INFORMATION

Pump Up 24 VAC LNC-NS210-024

Pump Up 120 VAC

Pump Up 240 VAC LNC-NS210-240

Pump Up 120 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

LNC-NS210-120

LLP-06.00-OSS

LLP-12.00-OSS

LLP-24.00-OSS

LNC-NS211-120

LOGIC TYPE INPUT VOLTAGE PART NUMBER

ACCESSORY PART NUMBER