DH_50 Cooled Multi-Alkali Photomultiplier (200-930nm)

  • DH_50 multi-alkali PMT

Housing an end-window multi-alkali (S20 photocathode) photomultiplier tube, a mu-metal shield and a PCB based dynode chain, reliable operation can be ensured. Peltier elements, powered by the CPS50 ensure temperature control.

The 215 high voltage supply module maintains the photocathode at a negative high voltage. The photocurrent generated by this detector is best measured using the 487 picoammeter or the 477 pre-amplifier followed by the 496 lock-in amplifier.

The quick-change mounting flange supplied with the DH_50 is compatible with the entire range of Bentham monochromators and accessories.

Core benefits


  • Housed photomultiplier tube featuring mu-metal shield and PCB dynode chain
  • Peltier-based cooling
  • Hermetically-sealed housing with quartz window
  • Operated in either the DC or AC regimes
  • Compatible with Bentham's entire range of monochromators and accessories
  • Recommended for use with 400 series detection electronics


Active area20x8mm
Window materialUV Glass
Number dynodes9
Dynode chain resistanceLinear: 750 kΩ
Pulse Counting: 3.92 MΩ
Operating modePhotoemmisive
Spectral response range200-900nm
Peak wavelength (typ.)420 nm
Dark current (typ.)1pA at 750V and -20°C
NEP1.3 x 10-16 W.Hz-1/2
Range of temperature control-20°C to +20°C
Max. high voltage1250V DC
Max. anode current100μA
Max. operating Temperature-30 to +50°C


CompatibilitySupplied with a quick change interface plate, 4 x M3 clearance holes (Bentham slit pattern)
DH_50 Typical Responsivity
Typical Responsivity of DH_50

Ordering Information

DH_50Thermo-electrically cooled multi-alkali photomultiplier detector (200-930nm)

The Bentham Standard

We’re with you from the first call to the final result

Call us on +44 118 975 1355 or email us