When ordering ERL Liquid Level Alarm Sensors, please provide the dimensional information indicated on the appropriate barge diagram below. This information is necessary to insure that your alarm sensors are manufactured to function at the correct high level and overfill depth settings to adequately protect your crew, cargo and barge. This information should be provided by the engineer who submitted the barge's plans to the Coast Guard. Also, specify the Specific Gravity range (highest and lowest specific gravities) of the cargos being transported in each barge for which you are ordering alarms. All factory alarm settings are relative to a specific gravity of 1.0 S.G.