NATIONAL CONTROLS NS146 User Manual

LIQUID LEVEL CONTROL SERIES
1.87
Chassis
Aluminum
AB
L1
L2
LOAD
C
L
H
Program Wire
C
L
2.81
Input Voltage
.187
Mounting Slots
2 places
To Probes
and Tank
3.50
(MOUNTING C/C)
4.00
L H C
To conductive tank
High Probe
.
Low Probe
Typical Probe Connection
To Level Control
(3672-4)
Resistance Sensors (Dual Probe, Dual Logic)
Model NS146
2-7
FEATURES
100% functionally tested
Solid state sensing circuitry
Isolated UL Class ll sensing voltage
Conformal coating to protect circuit
from harsh environments
File #E61377
SPECIFICATIONS
CONTROL TYPE
On/Off Resistance Sensing:
Mode A: Probe resistance below set point acti­vates load Mode B: Probe resistance above set point acti­vates load.
Sensing Voltage: 30 VAC, max. RMS Sensing Current: 1 mA, max. RMS Sensitivity Adjustment: Factory set at
Operating Logic: By switching a program
wire from position A to B, the user can select either pump down (Mode A), or pump up (Mode B) logic. In Mode A, the load is de-energized until the liquid reaches the high probe. When liq uid touches the high probe, the load is acti vated until the level drops below the low probe. In Mode B, the load is energized until the liquid reaches the high probe. When liquid reaches the high probe, the load is deac
­tivated 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.
50 K ohms ±20%
INPUT
Operating Voltage: 120, 240 VAC, ±10% Power Consumption: 3.0 VA max. Frequency: 50/60 Hz
OUTPUT
-
Type: Single pole solid state switch
-
Rating: 7.5 A resistive at 120, 240 VAC; 1/3 hp rated at 120, 240 VAC
Life: Electrical: 1,000,000 min. at full load
Note: Contact factory for higher rating requirements.
PROTECTION
Isolation: 1500 VAC between probe and other
terminals Transient Voltage: Protected by 30 joule metal
oxide varistor Coating: Conformally coated with RTV to protect
against moisture
MECHANICAL
Terminations: #8 screw for input voltage, .25” x
.032” fast-ons for load, .187” x .020” fast-ons for probes
Mounting: 2-3/16” slots on 3.5” center in alumi­num chassis
ENVIRONMENTAL
Operating Temperature: -20°C to 55°C
ORDERING INFORMATION
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
Pump Down/Pump Up 120 VAC LNC-NS146-120
Pump Down/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
LOGIC TYPE INPUT VOLTAGE PART NUMBER
ACCESSORY PART NUMBER
LLP-06.00-OSS
LLP-12.00-OSS
LLP-24.00-OSS
Program wire selects Pump Down Mode A or Pump Up Mode B.
LNC-NS146-240