The DAK 250 digital start-up channel consists of either the DAK 250i for pulse range (BF3, B10-counters or fission chambers) or the DAK 250g for the intermediate range (ionization chambers) which has linear or logarithmic output signals and a reactor period signal with an optional module for reactivity calculation. The DAK 250 channel is also used for steam generator leak monitoring (N16).

The DGK 250 power range channel uses linear signal processing and numeric calibration of one or two signal paths in PWR reactors and is used with a boron-coated neutron ionization chamber. In research reactors, the DGK 250 channel can use either/or uncompensated/compensated ion chambers and options include a peak pulse processor.

Start-up channel used with gamma compensated neutron ionization chamber for ex-core neutron flux monitoring.

Start-up channel used with boron-lined proportional counter for ex-core neutron flux monitoring.