Photomultiplier (CPM) Modules
(CPM RS 232 Module)

Photon Counting Module CMRS232 (RS232 interface)

The Photon Counting Unit CM RS232 series (RS232 Interface) is designed for applications in all fields of single photon detection, e.g. chemo-luminescence, bioluminescence, fluorescence, in vitro assay, environmental measurements or pure research. It is an easy to use module, containing the Customized Photomultiplier, high voltage power supply, discrimination amplifier, pulse shaper for fast output pulses and a microcontroller unit for data transmission to the RS232 interface of a Personal Computer. All operating functions can be controlled by software commands. Free download demo software is available.



  • Extremely low background noise
  • Best low light level detection limits
  • High dynamic range & gain
  • Low microphonic & magnetic sensitivity
  • Compact size & rugged design
  • Multiple photocathode and window selections
  • Plug and play for shortest design-in and time-to-market
  • Customizations and added features available



  • Photon Counting
  • Luminescence & Fluorescence Spectroscopy
  • Microplate Readers
  • Clinical Diagnostics
  • DNA & Cell Analysis
  • Particle Measurements
  • Industrial Spectroscopy
  • Nucleic Acid Amplification (PCR)
  • Hygiene Monitoring

Configuration parameters


  • Wavelength of interest: 115nm to 900 nm
  • Active diameter: 5mm, 15mm, (9mm upon request)
  • Input windows: MgF2, Quartz, UV-Glass, Borosilicate Glass
  • Photocathodes: CsTe, CSI, Bialkali, Low Noise Bialkali, Yellow Enhanced, Multialkali (S20), Multialkali Red Enhanced (S25)



Besides the standard configuration we do also take into account application-specific requirements. Thus we invite our customers to provide such information. Confidentiality is of course guaranteed.