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Large lens Pevicon Cameras

Several derivatives of the P4428 'fire' camera were produced with removeable narrow field of view lenses. These superceded the P4222.
The P4430 only had minor mechanical changes to accomodate the lens.
The P4431 used a 'hard' vacuum tube (P8093) run at higher voltages with modified PCB's similar to the final few P4428. It had motor focus and iris. This represented the limit of Pevicon tube performance as any bigger lens cost was not justified against a customer buying a cooled camera.
The P4440 while electrically similar had relaid PCB's and a shorter Pevicon tube to fit in a small diameter aluminium tubular body. This used a folded conical chopper wheel to reduce overall diamaeter compared to the flat spiral chopper wheel.


Data Table for P4430
   
Sensing Method Pyroelectric effect in TGS crystal material. Temperature changes from the scene cause charge to build up / decay on the inner face of the target material.
Sensor Type / Size EEV Pevicon, 18mm circular target area. Normally 'soft' vacuum, but a small number used a hard vacuum tube.
Lens Parameters 'Wreathall Mounted' lens 25, 50 or 75mm f/0/7 manual focus.
Dynamic Range / Control 60°C, manual iris in lens
Display 38mm CRT with magnifier
Sensitivity (MDTD) <300mK
Power Source 10 'AA' cells. Normally LR6 alkaline, or optionally NiCd
Power System Battery regulated to 8.7V, camera ~4W
Video Output BNC, produced in 60Hz / 525 line and 50Hz / 625 line variants
Image Processing Chopped by spiral flat chopper wheel, fully digital 1-field image store and addition to give a constant image.
Manufacturer Status Obsolete, no longer serviced
Number and Years Built 100's from 1988 - 1990
Export Status Not controlled
Publicity P4430 Brochure

P4431

     
Still frame and a video of the camera looking at shipping and traffic over a mile away (Harwich to Felixstowe) showing what a non-controlled camera was capable of doing. Save File 5MB

Data Table for P4431
   
Sensing Method Pyroelectric effect in TGS crystal material. Temperature changes from the scene cause charge to build up / decay on the inner face of the target material.
Sensor Type / Size EEV Pevicon, 18mm circular target area. Used 'hard' vacuum tube type
Lens Parameters Fixed mount 100mm f/0/7 motor focus moving the tube/yoke assembly.
Dynamic Range / Control 60°C, manual iris in lens
Display 38mm CRT with magnifier
Sensitivity (MDTD) <300mK
Power Source External belt battery pack 10 NiCd
Power System Battery regulated to 8.7V in camera ~5W
Video Output BNC, produced in 60Hz / 525 line and 50Hz / 625 line variants
Image Processing Chopped by spiral flat shutter with 1-field digital image store to give a constant image.
Manufacturer Status Obsolete, no longer serviced
Number and Years Built 10's from 1988 - 1990
Export Status Not controlled
Publicity Pevicon tube P8093 datasheet


Data Table for P4440
   
Sensing Method Pyroelectric effect in TGS crystal material. Temperature changes from the scene cause charge to build up / decay on the inner face of the target material.
Sensor Type / Size EEV Pevicon, 18mm circular target area
Lens Parameters 'Wreathall Mounted' lens 50mm f/0/7 manual focus.
Dynamic Range / Control 60°C, manual iris in lens
Display 38mm CRT with magnifier
Sensitivity (MDTD) <300mK
Power Source 10 'AA' cells. Normally LR6 alkaline, or optionally NiCd
Power System Battery regulated to 8.7V, camera ~4W
Video Output BNC, produced in 60Hz / 525 line and 50Hz / 625 line variants
Image Processing Chopped by conical shutter with 1-field digital image store to give a constant image.
Manufacturer Status Obsolete, no longer serviced
Number and Years Built 10's from 1988 - 1990
Export Status Not controlled


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Fire-TICs EEV P4430, P4431 & P4440 page 12 February 2024  All tradename © respective owners