scope:

This specification covers the requirements for electrical liquid level indicating equipment for Naval shipboard use in fresh water, feed water, potable water, seawater, waste water, diesel fuel, lubricating oil, contaminated oil, refrigerants, JP fuels and various other fluids in low pressure and high pressure tanks.

The types of liquid level indicating equipment shall be designated in the following form, as specified (see 6.2):

IC/CO MF SW/AR LP A 005/245/250 Basic type Sensing Application Pressure Display Indication technique range range (see 1.2.1) (see 1.2.2) (see 1.2.3) (see 1.2.4) (see 1.2.5) (see 1.2.6)

The basic type for Naval interior communication continuous output liquid level indicating equipment shall be designated by "IC/CO".

The sensing technique shall be designated as follows:

AZ - Admittance/impedance TD - Time domain reflectometry MF - Magnetic float CA - Capacitive DP - Differential pressure RT - Resistance tape-type

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, SEA 03R42, Naval Sea Systems Command, 2531 Jefferson Davis Hwy, Arlington VA 22242-5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The fluid to be measured shall be designated as follows. The first two-letter designation identifies the fluid to be measured in the tank. The second two-letter designation identifies the liquid or gas which interfaces with the measured fluid.

Fluid Liquid or gas CF - Contaminated fuel CO - Contaminated oil FO - Fuel (diesel fuel, cargo fuel, gasoline) FW - Fresh water, potable water, feed water HO - Hydraulic oil JP - JP-5, JP fuels LO - Lubricating oil RF - Refrigerants SO - Synthetic oil SW - Seawater TO - Turbine oil WO - Waste oil WW - Waste water, sanitary waste AR - Air CA - Compressed air CG - Compressed gas ST - Steam SW - Seawater WW - Waste water

The pressure range under which the sensing device shall operate shall be designated as follows:

AP - Vacuum pressure of 29.5 inches mercury (749 millimeters mercury) to 20 pounds per square inch gauge (psig) (138 kiloPascals (kPa)) inclusive. VP - Vacuum pressure of 29.5 inches mercury (749 millimeters mercury) to 100 psig (689 kPa) inclusive. LP - From 0 psig (0 kPa) to 100 psig (689 kPa) inclusive. HP - From 101 psig (696 kPa) to maximum pressure as specified (see 6.2).

The display shall be designated as follows:

A - Analog D - Digital C - Analog and digital

The indication range shall be designated by three numbers, separated by a "/". Each number shall represent a height in inches above the bottom of the tank. The first number shall indicate where liquid level indication shall begin. The second number shall indicate where liquid level indication shall end. The third number shall indicate the total height of the tank.

intended Use: