Grundfos / Leakage Detection
Grundfos ALR 20/A Ex Leakage Sensor Relay
Control-cabinet leakage sensor relay for use with the Grundfos AL05 Ex leakage sensor.
Product Overview
Leakage monitoring interface for AL05 Ex sensors
Grundfos ALR 20/A Ex is a leakage sensor relay intended for operation with the AL05 Ex sensor. The relay evaluates the connected leakage sensor and provides a relay output for the control system.
The ALR 20/A Ex relay itself is not explosion protected and must be installed in a control cabinet. The official instructions specify DIN-rail mounting and an ambient-temperature limit of 40 °C.
ALR 20/A EX relay dimensional illustration based on official Grundfos measurements.
Operating Functions
Sensor evaluation and alarm relay output
AL05 Ex interface
The relay is specified for use with the Grundfos AL05 Ex leakage sensor.
Adjustable switch point
The front control provides the sensor switch-point setting described in the official instructions.
Relay signalling
The output contact transfers the leakage condition to a control or alarm circuit.
Error indication
The front indicator supports status and fault recognition.
Product Specifications
Official identification and technical data
| Brand | Grundfos |
|---|---|
| Model | ALR 20/A Ex |
| Product type | Leakage sensor relay |
| Specified sensor | Grundfos AL05 Ex |
| Power supply | 230 V, 50/60 Hz |
| Power consumption | 4 VA |
| Relay output | Maximum 250 V, 100 VA, 5 A |
| Explosion-protection marking | [Ex ib Gb] IIC |
| Mounting | DIN EN TS 35 rail |
| Required spacing | 10 mm |
| Maximum ambient temperature | 40 °C |
| Relay location | Control cabinet; relay is not explosion protected |
Installation Highlights
Cabinet location and Ex separation requirements
Install outside the hazardous area
The relay is not explosion protected and belongs in a control cabinet.
Maintain spacing
The official instructions require DIN-rail mounting with 10 mm clearance.
FAQ
Grundfos ALR 20/A Ex technical questions
Which sensor is used with ALR 20/A Ex?
The official instructions specify the Grundfos AL05 Ex leakage sensor.
Can the relay be installed in an explosive atmosphere?
No. The relay itself is not explosion protected and must be installed in a control cabinet.
What supply is stated on the official relay documentation?
230 V at 50/60 Hz with 4 VA power consumption.
What is the maximum relay output rating?
The official instructions list 250 V, 100 VA and 5 A maximum.
What is the maximum ambient temperature?
The stated maximum ambient temperature is 40 °C.
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