Description
GESTRA NRS 1-54, NRS 1-55 Level Switch
The level switch NRS 1-54, NRS 1-55 in conjunction with level electrodes NRG 16-.. and ER 5. is used as water level controller, for instance in steam boilers and (pressurized) hot-water installations. The level switch detects and indicates in addition a MIN or a MAX water level.
The level switch can work with following level electrodes: NRG 10-52, NRG 16-52, NRG 16-36, NRG 16-4 and ER 5.-1
Function
The operation of the level switch NRS 1-54, NRS 1-55 is based on the conductive measuring principle using the elec- trical conductivity of water. The level switch is designed for different electrical conductivities and for connecting three electrodes rods.
The level switch works as on-off water level controller (for fill or discharge control) and indicates in addition when the preset MAX or MIN water level (MAX: NRS 1-54; MIN: NRS 1-55) is reached.
The lengths of the associated electrode rods determine the switchpoints for water level control and MIN or MAX water level.
The equipment monitors the water level by sensing whether the electrode rods are exposed or immersed and – by energizing or de-energizing the controller output contact – switches the feedwater pump on or off. The LED “Pump” is illuminated when the feedwater pump is switched on by the level switch.
The level switch detects that the MIN or MAX water level is reached when the corresponding electrode rod is exposed or submerged. After the de-energizing delay has elapsed, the MIN / MAX output contact is switched over. At the same time the MIN or the MAX LED changes from green to red.
A MIN or MAX alarm can be simulated by pressing the button “Test”.
Technical Data
Supply voltage
24 VDC, + / –20 %, 0.1 A
Fuse
external 0.5 A (semi-delay)
Power consumption
2 VA
Connection of level electrode
2 inputs for level electrode NRG 10-52, NRG 16-52,
NRG 16-36, NRG 16-4 and ER 5.-1,
4 poles with screen.
Sensitivity of response
(Electrical conductivity of water at 25 °C)
>0.5 …< 1000 µS/cm or >10 …< 10 000 µS/cm (switch-selectable)
Outputs
2 volt-free change-over contacts, 8 A 250 V AC / 30 V DC cos j = 1
De-energizing delay: 3 seconds (MIN or MAX alarm). Provide inductive loads with RC combinations according to manufacturer’s specification to ensure interference suppression.
Indicators and adjusters
1 pushbutton “Test” for simulating MIN / MAX alarm, 2 red/green LEDs for indicating “Operating mode” and MIN / MAX alarm,
1 green LED indicating “Power ON”,
1 code switch with 4 poles for changing sensitivity and function
Housing
Housing material: base: polycarbonate, black Front: polycarbonate, grey.
Terminal strips separately detachable.
Fixing of enclosure: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety
Pollution degree 2.
Protection
Housing: IP 40 to EN 60529 Terminal strip: IP 20 to EN 60529
Weight
approx. 0.2 kg
Further conditions:
Ambient temperature
when system is switched on: 0 … 55 °C, during operation: –10 … 55 °C
Transport temperature
–20 … +80 °C (< 100 hours), defrosting time of the de-energized equipment before it can be put into operation: 24 hours.
Storage temperature
–20 … +70 °C, defrosting time of the de-energized equipment before it can be put into operation: 24 hours.
Relative humidity
max. 95%, no moisture condensation
GESTRA NRS 1-54, NRS 1-55
Level Switch
GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems
GESTRA NRS 1-54 & NRS 1-55 Level Switch
High-Reliability Boiler Level Protection for Industrial Steam Systems
The GESTRA NRS 1-54 and NRS 1-55 Level Switch are premium-quality safety devices designed for reliable water level monitoring and protection in steam boilers and pressurized vessels. Manufactured by GESTRA, a global leader in steam and condensate management, these level switches ensure maximum operational safety, regulatory compliance, and system efficiency.
If your facility requires a high-accuracy boiler level switch that performs consistently in demanding industrial environments, GESTRA NRS 1-54 and NRS 1-55 are the trusted industry-standard solutions.
What Is GESTRA NRS 1-54 & NRS 1-55 Level Switch?
The GESTRA NRS 1-54 and NRS 1-55 are electronic level switches used for high-level and low-level water detection in steam boilers. They are designed to work in combination with GESTRA level electrodes, providing precise switching signals to protect boilers from unsafe water conditions.
These level switches play a critical role in boiler safety systems, helping prevent severe damage caused by low water level or overfilling.
Key Benefits of GESTRA NRS 1-54 & NRS 1-55 Level Switch
✔ Maximum Boiler Safety
Protects boilers against:
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Low water level (dry running)
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High water level (carryover risk)
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Overheating and tube failure
✔ Industrial-Grade Durability
Built for continuous operation in harsh environments with high temperature and pressure, ensuring long service life and reduced downtime.
✔ High Switching Accuracy
Provides fast and reliable switching signals for automatic boiler shutdown or alarm activation.
✔ Easy Integration
Fully compatible with GESTRA electrodes and boiler control systems, allowing seamless installation in new or existing systems.
✔ Compliance with International Standards
Designed and manufactured according to global boiler safety regulations, suitable for regulated industrial applications worldwide.
Difference Between GESTRA NRS 1-54 and NRS 1-55
| Feature | GESTRA NRS 1-54 | GESTRA NRS 1-55 |
|---|---|---|
| Function | Standard level switching | Extended safety switching |
| Application | Single-point level monitoring | Multi-condition level protection |
| Typical Use | General industrial boilers | High-risk or high-capacity boilers |
(Model selection depends on boiler design and safety requirements.)
Applications of GESTRA NRS Level Switch
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Steam boilers
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Power plants
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Chemical and petrochemical industries
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Food & beverage processing plants
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Pharmaceutical facilities
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Textile and manufacturing industries
Why Choose GESTRA Level Switches?
GESTRA is internationally recognized for its precision-engineered steam system solutions. Choosing GESTRA NRS 1-54 or NRS 1-55 Level Switch ensures:
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Increased boiler safety
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Reduced risk of costly accidents
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Lower maintenance costs
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Long-term operational reliability
These level switches are trusted by engineers, inspectors, and plant operators worldwide.
Buy Original GESTRA NRS 1-54 & NRS 1-55 Level Switch
We supply 100% genuine GESTRA NRS 1-54 and NRS 1-55 Level Switches with complete technical support and documentation. Our experienced team is ready to assist with product selection, installation advice, and after-sales service.
👉 Contact us today for the best price, fast delivery, and expert consultation.
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PT Totalitas Teknik Indonesia
PT Totalitas Teknik Indonesia
PT Totalitas Teknik Indonesia
