Level-Relay Type NS20K

Level Monitor for conductive liquids, 1 Niveau, 1 oder 2 Limits,  MIN / MAX-control, adjustable sensitivity, Housing Housing Design K for switchgear cabinet

Level-Relay Type NS20K

Part number

Product description

 

Level-Relays NS20K for conductive liquids can be used as monitors for 1 Level and for controlling a level between 2 electrodes.

  • 3 elektrodes for MIN/MAXcontrol
  • 2 elektrodes (E2 open) as level monitor
  • Sensitivity adjustable 5 kΩ…250 kΩ
  • LED for state of relay
  • Function of relay reversible (picks up or releases at top electrode)
  • Switching-delay adjustable 0,1…10 s
  • Housing 35 mm wide, mounting height 55 mm
  • Universal supply-voltage AC/DC 24-240 V

Application level monitor

Protection from running dry or overflow, monitoring of pumps for leaks, detection of leaks.

Application Min/Max

Controlling a level between minimum (electrode E2) and maximum (E3). As long as E3 is dry, a magnetic valve is opened (or a pump is running) and liquid is influencing. As soon as maximum
(E3) is reached, the NS20K closes the valve. When the level falls below E2, the cycle starts new. In reverse also discharging of a container can be controlled.

 

Technical Data

Supply voltage Us

.......

AC/DC 24 – 240 V    ......    0 / 50 / 60 Hz < 3 W < 5 VA

 

Tolerance

.......

DC 20,4 - 297 V         ......    AC 20 - 264 V

 

Level-electrodes (E1 , E2 , E3)

max. voltage

.......

< 6 Veff

 

max. current

.......

<250 μA

 

Switching point

.......

adjustable app. 5 kΩ ... 250 kΩ

 

Switching point 5 kΩ

.......

max. cable-length 2500 m    ......    max. capacity of cable 500 nF

 

Switching point 250 kΩ

.......

max. cable-length 50 m    ......     max. capacity of cable 10 nF

 

Switch on-/off-delay

.......

0,1...10sec adjustable

 

Tolerance

.......

25%

 

Data of relay (EN 60947-5)

Type of contact

.......

1 change-over-contact (CO)

 

Switching voltage

.......

max. AC 415 V

 

Switching current

.......

max. 6 A

 

Switching power

.......

max. 2000 VA (ohmic load)
max. 120 W bei DC 24 V

 

Rated nominal current Ie for co

.......

3 A AC15 250 V    ......     2 A DC13 24 V

 

Recommended fuse

.......

3,15 A slow ( gL )

 

Contact life mechanical

.......

3 x 107 operations

 

Contact life electrical

.......

1 x 105 operations at 240 V / 6 A
1 x 106 operations at 240 V / 2 A

 

Reduction factor at cosϕ = 0,3

.......

0,5

 

UL electrical ratings

.......

250 V ac, 3 A, general use
240 V ac, 1/4 hp, 2.9 FLA
120 V ac, 1/10 hp, 3.0 FLA
C 300

 

Test conditions (EN 61010 reinforced insulation)

Rated impulse withstand voltage

.......

4000 V

 

Overvoltage category

.......

III

 

Pollution degree

.......

3

 

Rated insulation voltage Ui

.......

250 V

 

On-period

.......

100 %

 

Rated ambient temperature range

.......

-20 °C ... +60 °C (EN 60068-2-1 dry heat) dry heat

 

EMC immunity

.......

EN 61000-6-2

 

EMC emission

.......

EN 61000-6-3

 

Vibration resistance (EN 60068-2-6)

.......

2…25 Hz ±1,6 mm
25 ... 150 Hz 5 g

 

Housing

Design

.......

K

 

Dimensions (B x H x T)

.......

75 x 22,5 x 110 mm

 

Line connection 1 wire

.......

each 1 x 0,75…2,5 mm2​

 

Stranded wire with wire-end sleeves

.......

each 1 x 0,14…1,5 mm2​

 

Protection housing

.......

IP 40

 

Protection terminals

.......

IP 20

 

Attachment

.......

Snap-mount on DIN-rail 35 mm according to EN 60 715 or screws M4

 

Weight

.......

app. 100 g