Description

 

🔹 Product Introduction

The ZIMMER HAMBURG S-NR01G is a level controller (Niveauregler) designed for conductive liquid level monitoring and control. The S-NR01G is part of Zimmer’s NR level-control system and is used with suitable level electrodes to detect liquid levels and operate a switching output.

Zimmer’s technical documentation explains that the NR controllers use galvanic isolation and operate with a floating measuring circuit. The controller evaluates the voltage measured through the liquid between the reference and level electrodes, making the system suitable for a range of conductive liquids.

The S-NR01G is identified in current industrial spare-part listings as a 24 V DC level controller. One listing specifies a power consumption of 0.6 W for the closely related S-NR01 version, while the S-NR01G listing confirms the 24 V DC supply.

 

📋 Product Datasheet

Parameter	Specification
Brand	ZIMMER HAMBURG
Model	S-NR01G
Series	NR Level Controller
Product Name	Level Controller / Niveauregler
Application	Conductive Liquid Level Control
Supply Voltage	24 V DC
Power Consumption	Approx. 0.6 W*
Control Type	1-Point Level Control
Reference	SV-2-164 No. 31
Country of Origin	Germany

*The 0.6 W figure is documented for the S-NR01 version; verify the exact nameplate/specification of the S-NR01G before using it as a design value. The S-NR01G itself is listed as a 24 V DC level controller.

 

⚙️ Main Technical Features

🔹 Conductive Level Detection
The controller works with conductive level electrodes and evaluates the electrical signal through the liquid.

🔹 Floating Measurement Circuit
Zimmer states that the NR system uses galvanic isolation of the power supply and a floating measuring circuit. This helps the level measurement remain independent of other electrical potentials.

🔹 Single-Point Level Control
The S-NR01 family is intended for one-point level monitoring/control. Zimmer’s documentation describes one-point control using a minimum electrode and reference electrode.

🔹 Adjustable Sensitivity
Zimmer states that NR controllers are delivered with the sensitivity potentiometer approximately at the midpoint. In many applications, no additional adjustment is required.

🔹 Self-Holding Relay Function
For the documented NR operating principle, the relay energizes when the appropriate level condition is reached and the switching contact can establish a self-holding condition. The relay releases when the level falls below the minimum condition.

 

🛠️ Operating Procedure & How to Use

1. Select the Correct Electrodes

Install compatible conductive level electrodes suitable for the liquid being monitored.

For a one-point application, Zimmer’s documentation indicates that the minimum-level electrode connection can be used while the additional minimum electrode connection remains unused.

2. Install the Controller

Mount the S-NR01G in a suitable electrical enclosure or control cabinet with adequate protection against moisture, contamination, and mechanical damage.

3. Connect the Level Probes

Connect the reference and level electrodes according to the controller’s wiring diagram.

For metal tanks, Zimmer notes that the tank itself can be used as the reference electrode by connecting the appropriate reference terminal directly to the container.

4. Connect 24 V DC Power

Apply the specified 24 V DC supply to the controller. Check polarity and wiring before energizing.

5. Connect the Relay Output

The switching contact can be used to control a compatible pump, valve, contactor, PLC input, or other control circuit, provided the connected load remains within the controller’s specified switching rating.

Zimmer’s technical information states that the switching contact can handle up to 250 V / 6 A for the applicable contact arrangement.

6. Adjust Sensitivity

Start with the factory/midpoint sensitivity setting. If the controller does not reliably detect the liquid, adjust the sensitivity according to the conductivity of the medium and the electrode arrangement.

7. Test the Level Function

Raise or lower the liquid level and observe the relay response. Confirm that the connected pump, valve, or control circuit reacts correctly.

 

⚡ Power-On Sequence

1. 🔒 Make sure the connected process equipment is in a safe condition.
2. 🔍 Check the S-NR01G wiring.
3. 🔍 Verify the 24 V DC supply polarity.
4. 🔍 Confirm correct electrode connections.
5. 🔍 Check the relay output wiring.
6. ⚡ Energize the 24 V DC supply.
7. 💡 Observe the controller’s operating indication, if fitted.
8. 🧪 Simulate the required liquid-level condition.
9. 🔄 Check relay switching.
10. ⚙️ Verify operation of the connected pump, valve, PLC input, or contactor.
11. ✅ Return the level-control system to normal operation.

 

🔌 Power-Off Sequence

1. 🛑 Stop the controlled pump, valve, or associated equipment.
2. 🔒 Place the process in a safe maintenance condition.
3. ⚡ Switch off the 24 V DC supply.
4. 🔍 Verify that the controller is de-energized.
5. 🔧 Disconnect the relay and electrode wiring if required.
6. 🛡️ Protect the controller from moisture and contamination during maintenance.

 

📖 Product Usage Instructions

The S-NR01G is designed for conductive liquid level control. The liquid must provide sufficient electrical conductivity for the electrode measurement principle to work reliably.

The switching difference in a multi-electrode arrangement is determined by the difference in electrode lengths. Zimmer also states that the reference electrode should be at least as long as the minimum electrode.

Cable capacitance and cable length affect the measuring circuit. Zimmer notes that longer cable runs are possible when low-capacitance measurement cables are used, with the permissible cable length depending on the sensitivity setting.

Typical applications include:

🏭 Industrial tanks

🚢 Marine equipment

💧 Pump control

🛢️ Liquid storage systems

⚙️ Automatic filling systems

🚨 Overflow protection

 

🔍 Inspection & Commissioning

Before commissioning:

• Confirm S-NR01G on the nameplate.

• Verify 24 V DC supply.

• Check electrode condition.

• Confirm electrode spacing and installation height.

• Check the reference electrode connection.

• Inspect the measuring cable for excessive capacitance or damage.

• Verify relay contact wiring.

• Check sensitivity adjustment.

• Test the switching action manually.

• Verify the connected pump or valve response.

 

❓ Common Questions & Answers

Q: What is the ZIMMER HAMBURG S-NR01G?

A: It is a 24 V DC level controller for conductive liquid level monitoring and control. The current spare-part listings identify it as a Zimmer Hamburg Niveauregler.

Q: What voltage does the S-NR01G use?

A: The S-NR01G is listed as a 24 V DC level controller.

Q: What type of liquid can it detect?

A: It is intended for conductive liquids because its measuring principle depends on electrical conduction between the electrodes.

Q: Is S-NR01G a PLC module?

A: No. It is a dedicated level controller with a switching function rather than a programmable PLC.

Q: Does it require a level probe?

A: Yes. The controller works with suitable level electrodes/probes. The controller itself does not directly measure liquid level without the electrode arrangement.

Q: Can it control a pump?

A: Yes, the relay output can be used as part of a pump-control circuit, provided the load and electrical arrangement remain within the specified contact rating. Zimmer documents a switching contact rating up to 250 V / 6 A for the applicable NR contact arrangement.

Q: Can it be used for overflow protection?

A: Yes. Zimmer’s NR system documentation specifically identifies level-control configurations for filling control and overflow protection.

Q: Does the controller have adjustable sensitivity?

A: Yes. Zimmer states that the NR controllers use a sensitivity potentiometer and are normally delivered with the potentiometer around its midpoint.

Q: What is the power consumption?

A: A 0.6 W value is published for the S-NR01 version. Because the supplied item is S-NR01G, the exact consumption should be confirmed from its nameplate or technical documentation.

Q: What is the country of origin?

A: Current S-NR01G listings identify Germany as the country of origin.

Q: What is the difference between S-NR01 and S-NR01G?

A: They are closely related Zimmer NR level-controller variants, but the exact suffix should be matched when replacing a unit. Do not assume the two versions are interchangeable without checking the original equipment documentation.

Q: What should be checked before ordering?

A: Confirm the exact model S-NR01G, supply voltage, electrode arrangement, switching requirements, installation dimensions, and the required level-control function.

 

🔟 Recommended ZIMMER HAMBURG / ZIMMER NR Series Models

1. ZIMMER HAMBURG S-NR01 — Single-point level controller
2. ZIMMER HAMBURG S-NR01G — 24 V DC level controller
3. ZIMMER HAMBURG D-NR98 — Double-level controller
4. ZIMMER HAMBURG D-NR98G — Related double-level control variant
5. ZIMMER NR Series — Conductive level-control system
6. ZIMMER NR Level Probes — Conductive liquid sensing electrodes
7. ZIMMER Reference Electrode — Reference component for NR controllers
8. ZIMMER Minimum-Level Electrode — Low-level sensing component
9. ZIMMER Maximum-Level Electrode — High-level sensing component
10. ZIMMER Level Control Relay System — Related level switching/control arrangement

Zimmer’s official technology information confirms the NR family includes one-point and double-level configurations and explains the electrode-based operating principle.

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