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.