NS20 liquid level control relay for conductive fluids.
  • NS20 liquid level control relay for conductive fluids.
  • NS20 liquid level control relay for conductive fluids.

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Manufacturer: ZIEHL

NS20 liquid level control relay for conductive fluids.

Level-Relays NS 20 for conductive liquids can be used as monitors for 1 Level and for controlling a level between 2 electrodes.

  • 3 electrodes for MIN/MAX control
  • 2 electrodes (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 (elektrode E2) and maximum (E3). As long as E3 is dry, a magnetic valve is opened (or a pump is running) and liquid is influenting. As soon as maximum (E3) is reached, the NS 20 closes the valve. When the level falls below E2, the cycle starts new. In reverse also discharging of a container can be controlled.

Overview of functions example filling with 2 electrodes

The detection of the level is made with a DC-free measuring of resistance between all electrodes The common electrode in E 1. A magnetic valve that is switched with relay-contacts 15-18 opens and lets liquid in until the upper electrode E3 is in contact with the liquid. Then the relay releases (15-18 open) and the valve closes. The relay remains released as long as electrode E 2 is in contact with the liquid. When the level falls below E2, the relay picks up (LED Relay on, 15-18 close) and the procedure starts new with opening the valve. Thus thelevel of the liquid is kept between E 1 and E 2.

For monitoring one level only or in applications to protect from running dry or overflow or leak detection, only electrodes E1 and E3 are connected.

Technical Data

Supply voltage Us AC/DC 24 – 240 V < 5 VA 0 / 50 / 60 Hz < 3 W
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 50178 / EN 60 947 safe insulation)

Rated impulse withstand voltage 4000 V
Contamination level 3
Rated insulation voltage Ui 250 V
On-period 100 %
Rated ambient temperature range -20 °C ... +60 °C (EN 60068-2-1 dry heat)
Interference resistance EN 61000-6-2
Interference transmission EN 61000-6-3
Vibration resistance (EN 60068-2-6) 2…25 Hz ±1,6 mm
25 ... 150 Hz 5 g

Housing

Design V2
Mounting height 55 mm
Dimensions (B x H x T) each 1 x 4 mm2
Stranded wire with wire-end sleeves each 1 x 2,5 mm2
Protection housing IP 30
Protection terminals IP 20
Attachment Snap-mount on DIN-rail 35 mm according to EN 60 715 or screws M4
Weight app. 130 g
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Level-Relays NS 20 for conductive liquids can be used as monitors for 1 Level and for controlling a level between 2 electrodes.

  • 3 electrodes for MIN/MAX control
  • 2 electrodes (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 (elektrode E2) and maximum (E3). As long as E3 is dry, a magnetic valve is opened (or a pump is running) and liquid is influenting. As soon as maximum (E3) is reached, the NS 20 closes the valve. When the level falls below E2, the cycle starts new. In reverse also discharging of a container can be controlled.

Overview of functions example filling with 2 electrodes

The detection of the level is made with a DC-free measuring of resistance between all electrodes The common electrode in E 1. A magnetic valve that is switched with relay-contacts 15-18 opens and lets liquid in until the upper electrode E3 is in contact with the liquid. Then the relay releases (15-18 open) and the valve closes. The relay remains released as long as electrode E 2 is in contact with the liquid. When the level falls below E2, the relay picks up (LED Relay on, 15-18 close) and the procedure starts new with opening the valve. Thus thelevel of the liquid is kept between E 1 and E 2.

For monitoring one level only or in applications to protect from running dry or overflow or leak detection, only electrodes E1 and E3 are connected.

Technical Data

Supply voltage Us AC/DC 24 – 240 V < 5 VA 0 / 50 / 60 Hz < 3 W
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 50178 / EN 60 947 safe insulation)

Rated impulse withstand voltage 4000 V
Contamination level 3
Rated insulation voltage Ui 250 V
On-period 100 %
Rated ambient temperature range -20 °C ... +60 °C (EN 60068-2-1 dry heat)
Interference resistance EN 61000-6-2
Interference transmission EN 61000-6-3
Vibration resistance (EN 60068-2-6) 2…25 Hz ±1,6 mm
25 ... 150 Hz 5 g

Housing

Design V2
Mounting height 55 mm
Dimensions (B x H x T) each 1 x 4 mm2
Stranded wire with wire-end sleeves each 1 x 2,5 mm2
Protection housing IP 30
Protection terminals IP 20
Attachment Snap-mount on DIN-rail 35 mm according to EN 60 715 or screws M4
Weight app. 130 g
Less
Read more
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