Level Controller
Precise control, reliable security
Standard features for all level controllers
• Electrode supply with alternating current
• Wide switching range. Reliable operation with fluctuating conductivity
Adjustment is rarely necessary
• Supply and measuring voltage galvanically isolated
• Safety circuit: If the supply voltage fails, the filling or
emptying process stops
• Mounting on DIN rails in the control cabinet
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Increased efficiency : Avoiding overflow and dry running
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Increased safety : Alarms warn of critical water levels
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Increased comfort : Continuous and reliable operation
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Cost savings: fewer losses, lower operating costs
S-NR 01 / S-RN 01
Detection of 1 or 2 levels
• Test button for functional testing of the measuring and signaling circuit
• LED indicators for relay status and operation
• Electrode supply with alternating current (also with 24V DC supply)
NR 98 / RN 98
Detection of 1 or 2 levels
• LED indicators for relay status and operation
D-NR 98 / D-RN 98
Detection of 2, 3 or 4 levels
• 2 separate functions can be individually combined
• LED indicators for relay status and operation
D-NR / RN 98
Detection of 2, 3 or 4 levels
• 2 separate functions can be individually combined
• LED indicators for relay status and operation
LC-01
Detection of 1 or 2 levels
• Function switch UP(NR) / DOWN(RN)
• conductive measuring principle (conductive media)
• LED indicators: Operation – Relay – Cable break
• Switch-on and switch-off delay
• Output: 1 changeover contact 250V AC / 6A
NR / RN 01
Detection of 1 or 2 levels
• Function NR or RN adjustable via jumper
• LED indicators for relay status and operation
NR 98LS, RN 98LS
Detection of 1 or 2 levels
• Installation in fuse or switch boxes
• LED indicators for relay status and operation
for use in potentially explosive areas
Safety barriers are used as separating stages without galvanic isolation between intrinsically safe and non-intrinsically safe circuits. It is possible to install level sensors in potentially explosive areas by incorporating a safety barrier. The safety barrier and the level controller must be installed outside the potentially explosive area.
Simply tell us the general conditions of your application – such as medium, area of application and special requirements. Our team of experts will find the optimal solution for you.
We offer customized products that meet your expectations quickly and efficiently.
Trust in our expertise and experience. Contact us today and let us find the perfect solution for your application together!
level controller: Automatic control for fluid levels
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Level controllers from our NR-Systems are designed to monitor and regulate liquid levels in closed containers. They are used in numerous applications, from industry to aquariums, fish breeding ponds and swimming pools.
Areas of application:
Industry: tanks and containers with chemicals, raw materials
Water supply: water towers, reservoirs
Aquariums: Constant water level
Heating systems: boilers, hot water tanks
How it works: As soon as the sensor has detected the fill level, it forwards this information to a control unit. This compares the current fill level with a target value and then controls the filling or emptying of the container. This can be done by various actuators, such as:
Pumps : Fill or empty the tank.
Valves : Open or close the inflow or outflow of fluid.
Alarms : Report a level that is too high or too low.
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Increased efficiency: Automatic control of the fill level prevents overflow or dry running, resulting in lower losses and more efficient use of resources.
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Increased security: Level controllers can trigger alarms when the level reaches a critical value. This helps to react in a timely manner in the event of a risk of flooding or undesirable level changes
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Reliability: Avoiding damage caused by overflow or dry running and efficient use of resources ensure smooth operation and high reliability.
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Cost savings: Costs can be saved by avoiding damage caused by overflow or dry running and by using resources more efficiently.
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Increased comfort: Level controllers ensure a constant fill level, which increases comfort in use.
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Conclusion:
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Level controller of the NR system are versatile and useful systems for the automatic monitoring and control of liquid levels.
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They offer many advantages and are used in numerous areas.
Advantages:
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Increased efficiency :
Avoid overflow and dry running -
Cost cutting:
Fewer losses, lower operating costs -
Increased security :
Alarms warn of critical water levels -
Increased comfort :
Continuous and reliable operation
Exact level control through our conductive technology –
robust, efficient and simply reliable!
Technical advice
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The products of the NR-Systems can be used practically without restrictions due to the galvanic isolation of the power supply. The level controllers are operated floating, which means that the measuring voltage is not connected to any other potential. The evaluation is carried out exclusively by measuring the voltage on the medium (liquid) and therefore depends directly on the properties of the medium and the electrode distance
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Setting the sensitivity The controllers are supplied with a potentiometer set to the average value. In most applications, no adjustment is necessary.
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Cable capacity / length The maximum cable capacity and the resulting cable length are directly related to the sensitivity setting. When using low-capacity cables for the measuring line (NR device to probe), longer cable lengths are possible. Potential connected. The evaluation is carried out exclusively by measuring the voltage on the medium (liquid) and therefore depends directly on the properties of the medium and the electrode distance.
Basic functions
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NR Min-Max control – 2 switching points (e.g. filling) Supply voltage is present, all electrodes are free. The relay is energized, the switching contact connects terminal 1 with terminal 3. As soon as the level has risen to the max electrode (5), a connection to the reference electrode (6) is established via the filling material. The relay drops out, the switching contact connects terminal 1 with terminal 2, the device goes into self-holding mode. The relay is only energized again when the level falls below the minimum level (electrodes free)
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RN Max-Min control – 2 switching points (e.g. empty) Supply voltage is applied, all electrodes are free. The relay is in the rest position, the switching contact connects terminal 1 with terminal 2. When the maximum level is reached (max electrode immersed), a connection to the reference electrode (6) is created via the medium. The relay is activated and the switching contact connects terminal 1 with terminal 3, the device goes into self-holding mode. The relay only drops out again when the minimum level is undershot (electrodes free).
Functional diagram
The following applies to both versions: 1 point control: If only one level is monitored, terminal 4 (min electrode) remains unused. For double level controllers, connections 1-8 in the lower part of the device are marked as 11-18
A notice!
The desired switching difference results from the length difference between the min and max electrode.
The reference electrode must be at least the length of the minimum electrode. When used in metal containers, the reference electrode can
by connecting terminal 6 directly to the container.
Connections 1 (11) to 3 (13):
Regardless of the supply voltage of the controller, terminal 1 can be supplied with any current type/voltage (AC/DC, max. 250V, 6A).
Terminals 2 (12) and 3 (13) transmit the desired signals.
Find the right one
Basic function selection
ÜL = overflow TL = dry running s = standard – = not available o = optionally available ü = optional (Example level controller: S-NR 01 – filling function or overflow protection)
(Example double level controller: D-NR 98 – filling function and overflow protection
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