The multiple probe type MS 015-A in connection with the controller type SMLC1 and DLR1/DHR1 is a self-monitoring water level limiter of special construction as per prEN 12953-9, 97/92/EEC, DIN EN 50156-1 and "Wasserstand 100" with additional 2-point control and LWL or HWL signalisation and is used as LWL limiter and level controller in steam boilers according to TRD and prEN 14222:2002.