CONTROLS CONTROLS
NR2 SERIES
LIQUID LEVEL CONTROL
UL listed CSA recognized
• Switch Selectable Pump Up or Down
•High and Low Sensitivity Models
• LED Power On Status
• LED Output Relay Status
Power
Maximum level
Minimum level
Down
Output
or
relay
Up
Controlled
Output
relay
U
level
Power
Down
or
Up
t
U
t
Unit power up
Controlled level
Draining function
Filling function
Unit power up
Controlled level
Draining function
Filling function
SPECIFICATIONS:
Input Power . . . . . . . . . . . . . . . . . . . . . . . . . . 24, 110, 230 VAC, +15%
Maximum Power Consumption . . . . . . . . . . 3 VA
Available Types Adjustable Maximum Cable
Low 250Ω to 5 kΩ 100 nF
Standard 5 kΩ to 100 kΩ 10 nF
High 50 kΩ to 1 mΩ 1 nF
Electrode Voltage . . . . . . . . . . . . . . . . . . . . . Maximum 24 VAC (50/60 Hz)
Electrode Current . . . . . . . . . . . . . . . . . . . . . Maximum 5 mA (50/60 Hz)
Response time . . . . . . . . . . . . . . . . . . . . . . . 100 ms at high level
Output relay . . . . . . . . . . . . . . . . . . . . . . . . . 1 single pole changeover contact
Galvanic isolation by transformer . . . . . . . . Class II VDE 0551 (4 kV;
Isolation of contacts and
electrodes with power supply . . . . . . . . . . . 2 kV AC
Operating Temperature . . . . . . . . . . . . . . . . . -10°C to +60°C
Storage Temperature . . . . . . . . . . . . . . . . . . -20°C to +70°C
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 g
Sensitivity Capacitance
500 ms at low level
AgCdO 10 A AC
creepage distance: 8mm)
GENERAL FEATURES:
Controls maximum and/or minimum levels of conductive
liquids (tap water, seawater, waste water, chemical
solutions, coffee, etc.) Applications for agri-foodstuffs,
chemical industries etc. The operating principle is based
on measuring the impedance of a liquid between two
submerged sensors. When this value is less than the
threshold set on the front panel of the unit, the output
relay changes status. The sensors are energized using
an AC current to avoid electrolysis.
1 - Regulation of two levels (minimum/maximum):
With the minimum electrode already submerged, the output relay changes status when the liquid level reaches the
maximum electrode. It returns to its initial status when the
minimum sensor is not longer in contact with the liquid.
NOTE:
-When power is restored after an interruption of 0.53
second or less; in “UP” mode the relay is immediately
energized; in “DOWN” mode the relay remains
de-energized. (Assuming liquid level is below max level).
2-Regulation of one level:
Connect the maximum and common terminals together.
The relay will change state when the minimum probe
enters or leaves the liquid.
OBSERVATION: If the tank is conductive (metallic), it can
be used as the reference electrode (terminal C or 6).
NOTE:
- A red LED displays the state of the relay, LED “ON” =
Relay “ON”
-A green LED displays presence of the power supply
5
ORDERING INFORMATION:
MOUNTING
D =DIN-rail
D
NR2 24A = 24 VAC
Products and specifications subject to change without notice.
NR2
SERIES
110A
INPUT POWER SENSITIVITY
LS = 250 Ω to 5 kΩ
110A =110 VAC
230A = 230 VAC
“BLANK”= 5 kΩ to 100 kΩ
HS = 50 kΩ to 1 mΩ
5-9
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