S31 AHD 720p Camera

High Resolution.
Exceptional Quality In Any Light.

  • 720P (1280 x 720) @ 30 fps
  • Integrated microphone to capture audio
  • 24 IR LED’s for illumination at night
  • Vandal resistant metal housing
  • 3D gimbal functioning
  • Sony EXMOR IMX225 CMOS Image Sensor
  • Easy installation and Integration with Gatekeeper DVRs

Exceptional Picture Quality In Any Light

The S31AHD is a 720P high definition analog camera that can connect to your existing video system without running new wire harnesses. The Quick-Connect cables ensure your existing wire harnesses plug and play with Gatekeeper DVRs. A full-metal vandal resistant design protects the lens and circuitry for long lasting performance.

Its unique 3D gimbal allows the base of the camera to be mounted in any orientation such as curved bus ceilings allowing the camera to be adjusted so the image is correctly oriented. Unlike conventional camera designs, the S31 AHD provides flexibility and outstanding imaging allowing you to capture any incident anytime.






Camera – Housing Features:

Integrated Microphone

The Gatekeeper S – Series camera housing includes an integrated microphone allowing high quality audio to be captured at each camera.

Integrated IR

The integrated IR utilizes 24 infrared LED’s to provide IR illumination at night.  A sensor in the camera detects the ambient light and automatically turns on/off the IR LED’s as needed.

3D Gimbal

The housing inherently implements a 3D gimbal design found in more expensive cameras.  This allows the base to be mounted in almost any orientation while allowing the camera to be adjusted so that the image is correctly oriented.

Tamper Proof Adjustments

Not only is the camera constructed of metal but there are set screws that when tightened, prevents the camera aim from being tampered with.  This is important for installation where the camera can be accessed, either due to low ceilings or accessible camera placement.

All Metal Housing

An all metal housing creates a vandal proof package that is resistant to physical damage.

90 Degree Aiming

The housing profile has been carefully designed so that the camera can be aimed 90° laterally and have a clear field of view.  This is important for correct aiming when the camera is located at the front of a bus.

Tolerant to Installation Error

The S31AHD – Series housing has been designed so that the camera ball cannot be positioned behind the cameras shroud thus reflecting infrared light back into the lens.  This reduces the probability of installation error.

Sealed Design

The ball that houses the camera electronics has no vents thus making the camera resistant to water spray.

Vibration Damping

In order to help reduce camera vibration, a rubber mounting ring is supplied.  The rubber ring is installed between the camera base and the mounting surface.  The rubber ring conforms to the camera base for easy alignment and quick installation.

Flexible Cable Routing and Mounting Options

The S31AHD camera is secured with 4 screws that are not accessible once the installation is complete.  The camera’s signal cable can be routed directly up through the camera base, so that it’s not exposed.  Alternatively, there are 4 cut outs in the base that allows the camera’s signal cable to be routed out the side of the base.  This is useful when the camera is mounted to a surface that is not accessible from the rear.

Internal IR Light Leakage Eliminated

On the front of the S31AHD camera is a flat lens that protects the camera lens from the environment.  This flat lens is divided into two concentric circles.  The outside circle allows the IR light to exit the camera.  The inner circle allows the cameras imaging element to view the scene.  A cylindrical sleeve is attached to the flat lens, and delineates the outside and inside circle.  This cylinder extends from the flat lens and surrounds the camera lens.  This mechanical assembly eliminates internally reflected IR light.  Some camera designs have no such mechanism, while other designs use a soft rubber boot that is intended to prevent internal reflected IR from entering the camera lens.  In Gatekeeper’s experience, a rubber boot can allow IR light to enter the lens and cause optical flare.  This can be exasperated as shorter lens sizes are used.  The cylinder shroud used in Gatekeeper’s S31AHD camera protects from internal reflected IR’s still maintained, when shorter lenses are implemented.

     Imaging Sensor Sony EXMOR IMX225 1/3” CMOS
     Processor Nextchip NVP2431H
     Minimum Illumination 0.1LUX/F1.2 (no IR),  0.0LUX (IR On)
     Resolution 720p (1280X720), WD1 (928X480), WHD1(928X240), WCIF (464X240), D1 (704×480), HD1 (704×240), CIF (352×240) DVR Dependent
     Effective Pixels 976(H) x 494(V)
     Sync  50/60 Hz
     Video Output  1.0V P-P/75Ω, NTSC
     S/N Ratio  ≥50db (AGC off)
     Electronic Shutter  1/30 to 1/100,000, second
     Gamma Correction  0.45
     AGC:  Auto
     White Balance  Auto
     BLC  Auto
     Capture Range
     Capture Speed
 Audio  Yes – Integrated mic and line driver
 IR  24 LEDs (850nm) with integrated on/off sensor
 Housing  Gatekeeper’s S3 camera housing
 Lenses Available  2.8mm, 3.6mm, 4.3mm, and 6.0mm
     Voltage Consumption  12v nominal 180 mA @ 12v IR On
     Dimensions  3” high x 3.5” base diameter (7.62cm x 8.89cm)
     Weight  .84 lbs (380 g)
     Operating Temperature  -40°F to +158°F (-40°C to +70°C)
     Operating RH  Under 90% non-condensing

S31 AHD Product Sheet