FN LS

KEY FEATURES

  • Automatic control and regulation of liquid levels.
  • 2 sensitivity ranges.
  • Filling or emptying function selected via dip switch.
  • High or low alarm selected via dip switch.
  • Memory can be selected.
  • LEDs indicate state of power supply, output relay and alarm relay.
VoltagesCode
230 V∿84870803 Obsolete

Specifications


Supply voltage Un 230, 120, 48 and 24 V ∿ 50/60 Hz galvanic isolation via transformer
Operating range 0.85 to 1.15 Un except 120 V ∿ : 0.85 to 1.1 Un
Nominal power 3 VA at Un
Maximal power 4 VA at Un + 15 %
Immunity from micro power cuts 10 ms
Delay on pick-up T1 = approx. 2 s
Response time on power up T4 = 500 ms
Insulation coordination Category III, degree of pollution 2 conforming to IEC/EN 60664-1 : 4 kV/2

Sensitivity range FN 5 kΩ →100 kΩ
Sensitivity range FNLS 250 Ω →5 kΩ
Display precision ± 30 % with maximum sensitivity
Electrode voltage 15 V ∿ (50/60 Hz)
Electrode current 1 mA
Response time on immersion T2 = 400 ms
Response time on emersion T3 = 700 ms

Output 2 AgCdO changeover
Breaking capacity FN LS : 2000 VA FN : 80 W
Maximum breaking current FN LS : 8 A ∿ FN : 8 A ⎓
Minimum breaking current FN LS : 100 mA ∿ FN : 100 mA ⎓
Max. breaking voltage FN LS : 250 V ∿ FN : 250 V ⎓
Mechanical life (operations) 2 x 106
Electrical life AC 12 2000 VA - 105 operations
Electrical life AC 15 Cos φ = 0,3 - 6000 operations
Electrical life AC 13 L/R = 300 ms - 6000 operations

Housing material Self-extinguishing
Terminal capacity 2 x 1,5 mm2 with ferrule 2 x 2,5 mm2 without ferrule
Temperature limit operation (IEC 68.1.14) (°C) -20 →+60
Temperature limits stored (IEC 68.1.1/2) (°C) -30 →+70
Relative humidity (no condensation) 93 % (+2 % ; -3 %)
Weight (g) 280

Technical sketches

Filling control with low alarm

Filling control with low alarm
Legend
1-
Memory OFF
2-
Memory ON
2-
T1 : Delay on pick-up
2-
T2 : Response time on immersion
2-
T3 : Response time on emersion
2-
T4 : Response time on power-down
On power-up, probe AI. is submerged, relays R1 and R2 are energised and the pump is ON : filling starts, the LED for relay R1 is lit. When the level reaches the Max probe, relay R1 de-energises and the pump is OFF : filling stops, the LED for relay R1 goes off. Relay R1 re-energises, when the Min probe emerges. In the event of a fault (level continues to fall) probe AI. emerges, relay R2 de-energises an the alarm is triggered : the LED for relay R2 is lit. This fault can be stored

Filling control with high alarm

Filling control with high alarm
Legend
1-
Memory OFF
2-
Memory ON
2-
T1 : Delay on pick-up
2-
T2 : Response time on immersion
2-
T3 : Response time on emersion
On power-up, the level in the tank is low, relays R1 and R2 are energised and the pump is ON : filling starts, the LED for relay R1 is lit. When the level reaches the Max probe, relay R1 de-energises and the pump is OFF : filling stops, the relay LED goes off. If, in the event of a fault, the level continues to rise and reaches proble AI., relay R2 de-energises and the alarm is triggered : the LED for relay R2 is lit. This fault can be stored.

Emptying control with low alarm

Emptying control with low alarm
Legend
1-
Memory OFF
2-
Memory ON
2-
T1 : Delay on pick-up
2-
T2 : Response time on immersion
2-
T3 : Response time on emersion
On power-up, probes Min, Max and AI. are submerged, relays R1 and R2 are energised and the pump is ON : emptying starts, the LED for relay R1 is lit. When the Min probe emerges, relay R1 goes off. If, in the event of a fault, the level continues to fall and probe AI. emerges, relay R2 de-energises and the alarm is triggered : the LED relay R2 is lit. This fault can be stored.

Emptying control with high alarm

Emptying control with high alarm
Legend
1-
Memory OFF
2-
Memory ON
2-
T1 : Delay on pick-up
2-
T2 : Response time on immersion
2-
T3 : Response time on emersion
2-
T4 : Response time on power-down
On power-up, probes Min, Max are submerged and probe AI. is above the level of the liquid. Relays R1 and R2 are energised and the pump is ON : emptying starts, the LED for relay R1 is lit. When the Min probe emerges, relay R1 de-energises and the pump if OFF : emptying stops, the LED for relay R1 goes off. If, in the event of a fault, the level continues to rise and reaches proble AI., relay R2 de-energises and the alarm is triggered : the LED for relay R2 is lit. This fault can be stored.

Programming

Programming
Legend
1-
Memory
2-
Alarm
3-
Function
4-
Low
5-
Emptying
6-
High
7-
Filling
Control of the level of a conductive liquid at specific points (high and low levels) with an alarm for a level which is abnormally high or low. The principle is based on measurement of the apparent resistance of the liquid between submerged probes. When this value is lower than the present threshold on the unit front face, the output relay R1 and/or the alarm relay R2 change state. The avoid electrolytic phenomena, an AC current runs across the probes. Set the sensitivity so that the relay will change state when the probes are in contact with the liquid. Then check that the relay returns to its initial position as soon as the probes emerge. In certain applications, fine-tuning the sensitivity prevents inappropriate detection, such as the presence of foam or bubbles on the surface or the occurrence of leakage impedance between probes (extended line capacity, humidity, etc). Latching of the alarm relay R2 in de-energised state if a fault occurs can the programmed via a switch on the underside of the underside of the unit (only when the unit is switched off). To reset alarm relay R2, cut the power, as long as the levels are reset. The FN level controller can be programmed using 3 switches on the lower panel : Memory, Alarm and Function must only be selected when the unit is switched off.

FN / FN LS

FN / FN LS

Regulating with "up" filling control

Regulating with
Legend
A1 - A2 : Supply voltage-
11 - 12 - 14 : Output relay (R1)-
21 - 22 - 24 : Alarm output relay (R2)-
C - Min - Max - Al. : Probe inputs-

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