What the experts aren't saying about borehole camera and how it affects you
Measuring and Recording the Camera Depth
Verbal or Visual Depth Recording
Footage is marked on all GeoVISION™ system cables. One can record the camera depth on a Digital video recorder, or other recording device by speaking into a microphone. The audio information is added to any recording made using the GeoVISION system’s audio circuitry.
Most users who produce recordings of their borehole work prefer to have the depth record on the screen, and their customers appreciate this service as well. The On Screen Camera Depth Display (OSD) is standard with the Deluxe System and optional with the Heavy Duty Econo. It will place the camera’s depth in feet or meters in any corner or centered on the video screen and will appear on the recorded video. The depth indicator may also be turned off. The footage counter encoder-wheel with clamp assembly and the OSD control box are part of the OSD attachment.
Cable Reel and Winch
Manual or Power Winch Operation
The GeoVISION™ Econo Heavy Duty winch and Light Duty reel manually lower and raise the camera with a hand crank.
The Motorized Winch is standard with all Deluxe winches. It has a speed and direction control unit. The motor drive provides for a smoother video while lowering the camera. It allows a single operator to concentrate on observing the image on the screen and operating the controls. It is also easier to clean the cable as it is raised when using the motorized winch. It is one of the most valuable features when the camera is regularly sent to depths of greater than 650 feet (200 meters).
View in all Directions
Manual Camera Head Tilting or Motorized Pan-tilt Attachment
In small boreholes, viewing straight down is usually adequate. As the borehole size increases the number of occurrences when side viewing is helpful increases.
The manual camera tilting attachment is supplied with all GeoVISION™ Standard and Jr cameras. It allows the operator to pull on the power cable to tilt the camera head up or down when used in conjunction with a pipe string. The camera can be rotated allowing the operator to see in every direction including up. This method with a user-supplied pipe string is effective to 300 feet and sometimes workable to 400 feet.
With the Motorized Pan-Tilt option the GeoVISION™ Jr. camera head can be tilted from down to almost straight up and rotated 360 degrees by remote control, to a depth of 2000 ft. You can look where you want, even up in 4 inch or larger boreholes; and see everything in one pass down the borehole. As a general rule, the larger and deeper the borehole, the more advantageous the motorized Pan-Tilt attachment becomes. In the large and deep boreholes, this attachment is the best time saver available.
Viewing and Recording the Information
Many users own monitors prior to purchasing a GeoVISION™ system. Therefore, we sell all monitors as separate items. Boreholes and voids may be viewed with many different types of monitors that are compatible with GeoVISION™ systems.
The monitor and recording options are:
Conventional TV – Any TV monitor with audio video jacks using the NTSC standard will work with GeoVISION™ systems. This is the standard used in North America, Japanand many other places.
LCD Monitors - These are very light and compact and allow viewing by more than one person at the same time. If portability is important, an LCD monitor should be the first choice. A 7 inch LCD monitor is available as an option with the GeoVISION™ system.
Digital Video Recorder – A high quality video.