MIL-DTL-23919C(SH)
SAE INTERNATIONAL
SAE-AMS-P-83461
- Packing, Preformed, Petroleum Hydraulic Fluid Resistant, Improved
Performance at 275 Mdf (135 Mdc)
SAE-AS8660
- Silicone Compound NATO Code Number S-736
(Copies of these documents are available from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA
15096-0001 or online at www.sae.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subject to first article inspection in accordance with
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life-cycle costs.
3.3 Construction.
3.3.1 Silver-silver chloride electrode element.
3.3.1.1 Chemical purity. The silver (Ag) wire used in fabricating the mesh/plate shall not contain less than 99.95
percent silver metal base purity. The silver chloride (AgCl) coating shall also have a metal basis purity of no less than
99.95 percent (see 4.5.7).
3.3.1.2 Cleaning. The silver surface shall be degreased and surface oxide fully reduced (cleaned) by means of a
hydrogen flame or equivalent chemical method just prior to application of AgCl. The silver surface shall be bright and
shiny once it has been cleaned. The silver shall be handled with stainless steel tongs to prevent contamination.
3.3.1.3 Application of AgCl coating. The AgCl coating shall be applied by either an electroplating or hot dipping
process. Sintering shall not be used unless prior approval of the process has been granted by NAVSEA.
3.3.1.4 Surface area. In order to achieve adequate surface area, the Grade A silver element shall have a mesh size
of 40 or finer. For a Grade B element, the final surface area of the plate shall be not less than 0.546 inches squared
(3.52 centimeters squared) or as approved by NAVSEA (see 4.5.8).
3.3.1.5 Life. The service life of a reference cell shall be 12 years without degradation at input impedance of the
reference cell monitoring circuit (see 4.5.9).
3.3.2 Electrical connection. The pin shall be made out of a noble material and plated in 99.95 percent silver metal
base purity and shall have a measured resistance of less than 1.0 ohms. Type II reference cells shall be constructed
such that the connection to the pin remains dry and free from oxidation after underwater replacement (see 4.5.10).
3.3.3 Assembly.
3.3.3.1 Material. The reference cell assembly shall be made of a non-conductive material to ensure that there is
isolation (no shorting or grounding) between the reference cell and the hull, preferably poly-vinyl chloride.
3.3.3.2 Pressure. The reference cell assembly shall be able to withstand the design pressure depending on the
class/hull of the specific vessel. After testing both Class I and Class II reference cell assemblies, testing in accordance
with 4.5.2 shall be repeated. Reference cells shall show no evidence of mechanical damage, water leakage, or
impaired electrical characteristics (see 4.5.6).
3.3.3.3 Shock. The reference cell assembly shall be certified as shock Grade B (see 4.5.11).
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