Morrison Bros. co. 918DP Installation, Operation And Maintenance Instructions

918DP Clock Gauge
Installation, Operation, and Maintenance Instructions
The 918DP Clock Gauge is designed to measure liquid volume in an aboveground storage tank. The gauge
mounts on top of the tank and is activated by a fl oat connected to a cable. The 918DP contains two normally
open switches to connect to an alarm device that can provide an audible alarm at two desired tank levels that are
set during installation.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
!
liquid spill, which could result in property damage, environmental contamination, fi re, explosion, serious
injury or death.
NOTE: The most accurate method to calibrate the tank is with fl uid in it. This will take into account variables
associated with the fl oat position, the mechanism, and the fl uid density. To calibrate a low alarm setting, the
tank fl uid level must be several inches lower than the desired alarm level setting.

Electrical Switch Ratings

10 watt resistive load, 127VAC-354mA max / 180VDC-500mA max (Ratings for resistive loads only.)
*Do not use for inductive loads.
Gauge Installation & Calibration
WARNINGS
!
• Fire Hazard – Death or serious injury could result from spilled liquids.
• You must be trained to install or maintain this gauge. Stop now if you have not been trained.
• Any modifi cation to this gauge other than those stated in these installation instructions will void the
product warranty.
• This device is intended to be used as an auxiliary warning to the operator of a possible overfi ll situation
and should not be the only system in place to prevent a tank from overfi lling. It is the sole responsibility
of the operator to continuously prevent any spillage regardless of the situation or status of the gauge.
• Install in accordance with all applicable local, state, and federal laws.
• For your safety, it is important to follow local, state, federal and/or OSHA rules that apply to work-
ing inside, above, or around the storage tank and piping area. Use all personal protective equipment
required for working in the specifi c environment.
• Tanks could be under pressure. Vapors could be expelled from tank vents, piping, valves or fi ttings while
performing installation. Vapors could catch fi re or cause an explosion. Avoid sparks, open fl ame, or hot
tools when working on gauge.
• Use a dampened cloth when cleaning the clear front cover of the gauge or 918 alarm device to prevent
static buildup and discharge.
• In the event of malfunction, contact Morrison Bros. Customer Service.
rev. 09-30-15
Morrison Bros. Co. - Dubuque, IA - 800-553-4840
918DP-0120 PPEVR
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