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ALR 20/A Ex

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Grundfos ALR 20/A Ex is an intrinsically safe leakage sensor relay for monitoring water ingress into the gear oil of submerged mixers, flowmakers and recirculation pumps.
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Technical specifications for ALR 20/A Ex

  • Manufacturer:
    Grundfos
  • Part Number:
    ALR 20/A Ex
  • Product Family:
    Grundfos
  • Product Type:
    Leakage Sensor Relay
  • Stock:
    1
  • Nominal operating voltage:
    230 VAC
  • Permitted voltage tolerance:
    230 VAC
  • Frequency:
    50/60 Hz
  • Power input:
    approximately 4 VA
  • Relay output:
    one potential-free change-over switch
  • Maximum switching voltage:
    250 VAC / 24 VDC
  • Maximum switching current:
    5 A
  • Maximum switching capacity:
    100 VA / 100 W
  • Electrical life:
    100,000 switching cycles at maximum load
  • Mechanical life:
    20,000,000 switching cycles
  • Ambient temperature:
    -20 to +40 °C
  • Relative humidity:
    95%, non-condensing
  • Maximum installation altitude:
    2,000 m above sea level
  • Product enclosure rating:
    IP20
  • Required protected cabinet rating:
    IP54 or better
  • Weight:
    0.175 kg
  • Estimated shipping dimensions:
    96 × 49 × 50 mm
  • Tariff Code:
    Please confirm the destination before shipping.
  • Country of origin:
    Denmark
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Diagnostics & Protection Installation & Integration Safety & Compliance

Features:

  • Leakage monitoring is performed through the dedicated Grundfos AL05 Ex sensor circuit.
  • A front-panel indicator identifies relay or sensor fault conditions.
  • Potential-free relay contacts provide an external fault signal for control integration.
The current configuration is the ALR 20/A Ex relay for 230 VAC, 50/60 Hz operation with the associated AL05 Ex leakage sensor.

The relay is intended to monitor sealing condition in submerged mixers, flowmakers and recirculation pumps by evaluating the sensor signal.

Install the relay in a protected control cabinet on a TS 35 rail, maintain circuit separation, and follow the specified Ex installation requirements.
The ALR 20/A Ex remains available as a documented Grundfos leakage-monitoring relay configuration.
Grundfos ALR 20/A Ex Leakage Sensor Relay Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Submerged mixers requiring gear-oil leakage monitoring.
  • Flowmakers equipped with the Grundfos AL05 Ex leakage sensor.
  • Recirculation pumps requiring seal-condition supervision.
  • The relay enters error mode when the measured sensor current falls outside the permitted operating range.
  • A cable break or short circuit is automatically interpreted as a fault condition.
  • The relay can return to normal operation automatically after the fault condition has been removed.
  • The relay is designed for mounting on a 35 mm TS 35 DIN rail with 10 mm side clearance.
  • Relay terminals 1-3 and 1-4 provide the potential-free change-over output.
  • The sensor connection uses terminals 5-7 and requires a screened cable when extended.
  • The relay is marked II(2)G [Ex ib Gb] IIC for the specified intrinsically safe sensor circuit.
  • The AL05 Ex sensor and relay system is covered by ATEX certificate SEV 18 ATEX 0129 X.
  • Grundfos documentation also identifies IECEx SEV 18.0008X and UKEX CML 22UKEX1081X.
Description
Grundfos ALR 20/A Ex is a 230 VAC leakage sensor relay designed for use with the Grundfos AL05 Ex sensor. It monitors the sensor current associated with water entering the gear oil of submerged equipment. The relay is installed outside the wet area and forms part of the sensor protection system.

The relay supports submerged mixers, flowmakers and recirculation pumps in applications where seal condition must be monitored continuously. A front-panel error indicator and potential-free change-over contact provide a clear response when leakage, cable damage, short circuit or power failure is detected.

The unit is mounted inside a protected control cabinet and can be fitted on a TS 35 DIN rail. Its Ex-related installation requires the specified AL05 Ex sensor, suitable separation of intrinsically safe circuits, and compliance with the applicable installation standards.
Alternative Names
ALR20/A Ex ALR-20/A-Ex ALR 20 A Ex ALR20AEX ALR20AEx Grundfos ALR 20/A Ex Grundfos leakage sensor relay ALR 20/A Ex 230 V 50/60 Hz
Technical notes
Grundfos ALR 20/A Ex must only be used with the AL05 Ex leakage sensor; the relay itself is not explosion-protected and must remain outside the potentially explosive area.After every sensor connection or reconnection, the switch point must be recalibrated with a suitable isolated tool.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Does the Grundfos ALR 20/A Ex require routine maintenance?
The manual states that the relay requires no maintenance and may be cleaned with a dust-free cloth.
How should the switch point of the Grundfos ALR 20/A Ex be adjusted?
The switch point must be set after each sensor connection or reconnection using a suitable isolated tool.
What equipment can use the Grundfos ALR 20/A Ex leakage-monitoring system?
The system is intended for submerged mixers, flowmakers and recirculation pumps.
Can the Grundfos ALR 20/A Ex be installed directly in a hazardous zone?
No. The relay itself is not explosion-protected and must remain outside the potentially explosive environment.
Is the Grundfos ALR 20/A Ex suitable as a replacement without checking the sensor?
No. Replacement must confirm the AL05 Ex sensor, terminal arrangement, Ex documentation and control-cabinet installation.
What information should be included when requesting a quotation for Grundfos ALR 20/A Ex?
Provide the complete model, required quantity, existing sensor or equipment details, destination and any certification requirements.

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