World News

Industry news and insights from Europe and around the World

UK News

Latest news and developments in the United Kingdom


Keep up-to-date with the latest new products and technology


General articles, applications and industry analysis

Ensuring optimum oil levels

GERMANY: Armaturenwerk Altenburg (AWA) has launched a new oil level regulation system, OLC, for use in compound systems with reciprocating or scroll compressors.

AWA’s OLC employs an electronic float sensor to provide variable level measurement. It can be used in systems of up to 120bar for a variety of refrigerants and oils and is said to ensure permanent and instantaneous level detection. In addition to the level, the speed of change of the level is also evaluated. 

The electronic float is said to be insensitive to foaming and swashing oil. 

Other features include a large sight glass, an LED display on the front for fast status recording and a modular adapter system for connection to all common compressor types. Installation dimensions are reduced by up to 25%, making it possible for plant constructors to design more compact composite plants. 

The OLC includes two new functions to protect the refrigeration compressors: Power ON and Emergency Injection.

The Power ON logic is activated the first time the compressor and AWA OLC are switched on. If the compressor level falls within the alarm range in less than ten seconds, the OLC immediately sprays oil into the compressor until the normal range is reached again. If the oil level does not fall within the alarm range when switching on, the Power ON monitoring is deactivated again and the OLC operates in normal mode.

Emergency injection is operated when there is a sudden increase in oil demand, which can occur with frequency-modulated compressors. This rapid oil level change is detected by the OLC which deactivates the delay in normal operation and injects oil immediately.

For optimum lubrication of the compressor, the AWA OLC regulates its oil quantity to a level of 40%-60%. If the value falls below the normal range, a delay counter is activated. During normal operation, this prevents the system from swinging up and the compressor from overfilling. After ten seconds the injection of oil begins. If the oil level drops below the critical range (40%-25%) despite active filling, an alarm counter starts which switches an alarm relay after 80 seconds. This relay contact can be tapped and used, for example, to switch off the compressor or trigger an alarm routine.

Armaturenwerk Altenburg

Latest News

26th February 2024

Modine buys Canadian AHU manufacturer

USA/CANADA: Modine has entered into a definitive agreement to acquire Canadian air handling unit manufacturer Scott Springfield Manufacturing. 
26th February 2024

Stulz partners on immersion cooling

GERMANY/NETHERLANDS: Stulz Modular, the data centre design, build and maintenance services provider, is cooperating with Dutch immersion cooling specialist Asperitas in the field of liquid cooling.
26th February 2024

Brian Streatfield 1936-2024

UK: Brian Streatfield, a man who was instrumental in the formation of Carrier in the UK during the 1970s, died at the weekend. He was 87.
25th February 2024

Safety is vital in global F-gas transition

UK: Institute of Refrigeration president Graeme Fox has warned of the real-world issues that the “rapid transition” to “natural” refrigerants poses for developing countries.
25th February 2024

Terrie Lamb wins lifetime achievement award

UK: Terrie Lamb of Cimetrics was recognised for 25 years of dedication to the RACHP sector in a night of awards at Thursday night’s annual Institute of Refrigeration (IoR) dinner.
25th February 2024

Boosting EV range with microwave energy

UK: Researchers from the University of Birmingham are working on an energy storage system which couples a chemical heat pump with microwave energy to produce heating or cooling on demand.