Oil level controller OLM-IQ

With the OLM-IQ, Bitzer offers its own electronic oil level controller. It is mounted to the sight glass connection by means of an adaptor. The OLM-IQ actuator-sensor unit can be purchased as an accessory to the CM-RC compressor module (mounted ex factory or for retrofitting) and enables a stable oil level through continuous oil level measurement, dosing of the oil return and adaptation to the oil supply pressure. The logic including communication to the higher-level system controller and data log is fully integrated into the CM-RC (CM-RC-01 or CM-RC-02 with extension boards CM-IO-A or CM-IO-B).

The OLM-IQ is available for ECOLINE and ECOLINE tandem compressors for standard refrigerants and R744:

OLM-IQ1: Design for standard compressors
OLM-IQ2: Design for R744 applications with oil pressure difference up to 100 bar
OLM-IQ3: Design for R744 applications with oil pressure difference up to 40 bar

For details see Technical information documents on the CM-RC:

KT-230: Technical information Compressor module CM-RC-01 for reciprocating compressors
KT-240: Technical Information Compressor module CM-RC-02 for reciprocating compressors
KT-241: Technical Information Extension board CM-IO-A for CM-RC-02
KT-242: Technical Information Extension board CM-IO-B for CM-RC-02

Example equipment of a 8-cylinder compressor with CM-RC-02 compressor module, discharge gas temperature sensor, pressure transmitters, oil heater, CRII capacity control, differential oil pressure switch and OLM-IQ oil level controller.

Actuator-sensor unit of the OLM-IQ
1: Oil level sensor in the sight glass
2: Oil connection 7/16-20 UNF
3: Data cable and voltage supply in IP65 housing

Oil level controller OLM-IQ2 (part no. 347 334 13) at the compressor (example)