NATIONAL CONTROLS NS157 User Manual
2-10
240V120VCOM
LNC-NS141-*10
240 V COM120 V
LOAD
HI
LO
COM
3.50
4.00
1.40
2.80
.187 X .020 MALE
FAST-ON (3 PL)
.250 X .032 MALE
FAST-ON (6 PL)
.10
.312
MAX
1.70
.250
R
R
E61377
A B
IDLE
(RED LED)
LOAD
120 V
COM 240V120V
240 V
COM
COM HI
LO
075
120 VAC
240 VAC
INPUT VOLTAGE
LOAD
NOTE: MUST USE COM TO 120 V
OUTPUT WHEN 120V INPUT IS USED
MUST USE COM TO 240 V OUTPU
T
WHEN 240 V INPUT IS USED
LIQUID LEVEL CONTROL SERIES
Resistance Sensors (Low Water Detect Logic)
Model NS157
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
SPECIFICATIONS
CONTROL TYPE
On/Off Resistance Sensing: Probe resistance
below set point activates output relay
Sensing Voltage: 20 VAC, max. RMS
Sensing Circuit: 2 mA, max. RMS
Sensitivity Adjustment: Factory set at
50 K ohms ±10%
INPUT
Operating Voltage: 120, 240 VAC, ±10%
Power Consumption: 3.0 VA max.
Operating Logic: The output relay is acti
vated when liquid touches the probe. As the
liquid level drops below the probe, the relay
is deactivated.
If the tank is non-conductive, a second
(common) probe must be installed at a level
where it will always be submerged.
-
Frequency: 50/60 Hz
OUTPUT
Type: SPDT relay, isolated contacts
Rating: 5 A resistive at 120 VAC 100 mA at
5 VDC min. load current
Life:
Mechanical: 2,000,000 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 70°C
ORDERING INFORMATION
Low Water Detect 120 VAC LNC-NS157-120
Low Water Detect 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
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
LOGIC TYPE INPUT VOLTAGE PART NUMBER
ACCESSORY PART NUMBER
LLP-06.00-OSS
LLP-12.00-OSS
LLP-24.00-OSS
LLP-001/2-011
LNC-NS157-240
1.299
165 dia.
1.575
2.362
1.299
.984
.709
.866
.165 dia.
Mounting Holes
2 pl.
.315
6
5 4
3
7 2
1
8
Socket
3.3 2 6 REF .
.360
.718
.437
.687
.625
.410 dia.
3/8 x18 DRYSEAL TAPER
PIPE TREAD (SAE SHORT)
1.250
TERMINAL NUT
8 - 32 NC - 2 THREAD
2 PLACES
.531 dia.
STAINLESS STEEL SHELL
AL2O
3
INSULATOR
S.S. CONNECTOR
NUT
TERMINAL NUT
.687
1/4 - 20 NC - 2
11/32 FULL THREAD
13/16
HEX
3/8
HEX
GLASS SEAL
1/2–1/8
L–1/8
1/4 dia.
CHAMFER 1/32 x 45¦
7.00
.065 ± .015
.45
.33
.45
1.50 MAX.
.30 MAX.
.750
#8 - 32 THREAD
TERMINAL
.50 x 20 THREAD
’O’ RING SEAL
ULTEM PLASTIC
BODY
STAINLESS STEEL
PROBE
.1.00
.875
.dia.
ORDERING INFORMATION
8-pin Circular Socket, DIN Rail
Mountable
MSO-0008P-012
Probe Holder
Metal parts are 300 series non-magnetic
stainless steel. These internally conductive
glass-seal probe holders will withstand up to
2500 psi or 700°F.
The probe holders are rated at 250 V and can
be used in steam applications up to 250 psi.
ORDERING INFORMATION
Probe Holder with Ground LLH-11383-010
LIQUID LEVEL CONTROL ACCESSORIES
2-11
Probes
ORDERING INFORMATION
Stainless Steel 6” Probe LLP-06.00-OSS
Stainless Steel 12” Probe
Stainless Steel 24” Probe
LLP-12.00-OSS
LLP-24.00-OSS
Hold-down Strap
ORDERING INFORMATION
Hold-down Strap for Plug-In Level
Sensors
Button Probe
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
ORDERING INFORMATION
Button Probe LLP-001/2-011
ASY-STRAP-7.00L
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