Diakont offers both a quartz and an acrylic front optical window for the standard D40 camera axial head. The non-browning quartz window can be used for the lifetime of the camera, or alternatively the acrylic window has extremely high resistance to impact, with lesser radiation-tolerance.
Through typical camera use, the acrylic window may become scratched, or embrittled due to radiation exposure. The acrylic window and O-rings should be replaced at least once a year, or as-necessary to ensure proper impact-resistance, sealing, and image quality.
Replacement is easy and fast – but must be completed properly to ensure that the water-tight integrity of the camera is maintained.
To replace the axial head acrylic window, follow these steps:
1.) Assemble required materials:
- General knowledge of safe D40 operation and maintenance practices
- Replacement acrylic window
- Replacement window O-ring (31.47×1.78, 2-026)
- Replacement axial head O-ring (34.65×1.78, 2-028)
- 4027 wrench
- 4035 wrench
- Thin screwdriver, or pick
- Lint-free cloth
- Gloves
- Magnifying lens
- Compressed dry air
- 1:1 alcohol-ether mixture
- Silicone grease (494-124 “RS”)
- Thread grease (VNIINP-275)
2.) Turn off CCU, disconnect power, and disconnect D40 from umbilical cable
3.) Don gloves
4.) Remove the axial head “lens cap” (if applicable); Remove the axial head from the camera (use the 4027 wrench if necessary)
5.) Using the 4027 & 4035 wrenches together, carefully loosen, unscrew, and remove the stainless steel window retaining ring from the axial head housing
6.) Remove the spacer and the window
7.) Using the thin screwdriver or pick, remove both the window and the head O-rings from their grooves
8.) Remove any old buildup from the O-ring grooves, threads, and sealing surfaces; Clean with a lint-free cloth moistened in the alcohol-ether mixture
9.) Carry out a visual inspection of the new replacement O-rings using the magnifying lens; Do not use O-rings with defects such as splits, cracks, or blisters (NOTE – While inspecting and positioning the O-rings, brief stretching is allowed, but stretching should not exceed +50% of length for rings with an inner diameter < 50 mm)
10.) Fit each of the new O-rings into their respective grooves
11.) Verify that the inner surfaces of the head are clean; If not, first wipe the surfaces with the lint-free cloth moistened in the alcohol-ether mixture; then blow out with compressed air (NOTE – Do not apply any grease to the window O-ring or window retaining ring threads)
12.) Fit the new acrylic window and the spacer in position inside the stainless
steel window retaining ring (spacer farthest from camera, then the acrylic window); The shoulder on the perimeter of the acrylic window should face away from the camera
13.) Carefully thread the retaining ring (with spacer and window) onto the axial head, and tighten using the 4027 & 4035 wrenches together (NOTE – Do not overtighten more than 1/8 turn past hand-tight; it is normal for there to be a gap between the retaining ring and the axial head housing)
14.) Lightly lubricate the axial head O-ring with a small amount of silicone grease, and the axial head threads with a small amount of thread grease
15.) Verify that the camera lens glass and camera internal areas are clean; If not, first wipe the surfaces with the lint-free cloth moistened in the alcohol-ether mixture; then blow out with compressed air
16.) Carefully thread the axial head assembly onto the camera (NOTE – Do not overtighten
beyond hand-tight)
Please do not hesitate to contact us with questions or for additional information, parts, or tools. Diakont is committed to ensuring the success of your operations through the continued reliability of our equipment.
+1-858-551-5551