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Photosensor module



The H7422 series are photosensor modules with an internal high-voltage power supply circuit and a cooler installed to the metal package photomultiplier tube. Efficient cooling was achieved by placing the cooler near the photomultiplier tube to reduce thermal noise emitted from the photocathode and a high S/N ratio can be obtained even at extremely low light levels. The H7422-40 has high sensitivity in the 300 nm to 720 nm wavelengths. The H7422-50 is sensitive along a wide spectral range from 380 nm to 890 nm. The photomultiplier tube is maintained at a constant temperature by monitoring the output from a thermistor installed near the photomultiplier and then regulating the current to the thermoelectric cooler.

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Photocathode Area Shape Round
Photocathode Area Size Dia.5 mm
Wavelength (Short) 380 nm
Wavelength (Long) 890 nm
Wavelength (Peak) 800 nm
Dimension (W x H x D) 56.0 x 36.0 x 104.0 mm
Input Voltage +11.5 to +15.5 V
Max. Input Voltage 18 V
Max. Input Current 62 mA
Max. Output Signal Current 2 μA
Max. Control Voltage 0.9 V
Recommended Control Voltage Adjustment Range +0.5 to +0.8 V
Sensitivity Adjustment Range 1:50
[Cathode] Blue Sensitivity Index (CS 5-58) Typ. -
[Cathode] Red/White Ratio Typ. -
[Cathode] Radiant Sensitivity Typ. 50 (at 550 nm) mA/W
[Anode] Radiant Sensitivity Typ. 2.5 x 104 A/W
[Anode] Dark Current (after 30min.) Typ. 0.5 nA
[Anode] Dark Current (after 30min.) Max. 1.3 nA
[Time Response] Rise Time Typ. 1 ns
Ripple Noise (peak to peak) Max. 0.6 mV
Settling Time Max. 0.2 s
Operating Ambient Temperature +5 to +35 ℃
Storage Temperature -20 to +50 ℃
Weight 400 g

Dimensional outline (Unit: mm)

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