System Sensor B501 Plug-in Detector Base

The System Sensor B501 Plug-in Detector Base is a 4″ European-style flangeless mounting base for use with a variety of plug-in detector heads: FSC-851, FSP-851, FSP-851T, FSI-851, FST-851, FST-851H, FST-851R, FAPT-851, FSL-751, LPX-751L, SD355, SD355T, CP355, H355, H355T, H355R, AD355, ASD-PL2F, ASD-PTL2F, ASD-IL2F, ATD-L2F, ATD-HL2F, ATD-RL2F, MCS-ACCLIMATE2F, ASD-LS, 2951ADT, 2951TADT, 1951ADT, 5951ADT, 5951HADT, 5951RADT, 2951MADT, NP-100, NP-100T, NI-100, NP-A100, NH-100, NH-100R, NH-100H, 2951J-COPTIR, 2951J, 2951TJ, 1951J, 5951J, 5951HJ, 5951RJ, 2951TMJ, 7351J, 2251FB, 2251TFB, 1251FB, 5251FB, 2251B, 2251TB, 1251B, 5251B, 5251H, 5251RB, 2251TMB, 7251, IDP-PHOTO, IDP-PHOTO-T, IDP-ION, IDP-HEAT, IDP-HEAT-HT, IDP-HEAT-ROR, TC840C1000, TC806B1076, TC806B1084, TC807B1059, TC808B1041, TC808B1066, TC808B1058, TC840M1021, TC846A1005, TC846A1013