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Morrison Bros. Co. - Dubuque, IA - 800-553-4840
918---0188 PP rev8.12.13
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The 918 Clock Gauge is designed to measure liquid level 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 918 is designed to connect to an alarm box
that can provide a high level audible alarm at a desired volume that is 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.
Gauge Installation & Calibration
Warnings
• Fire Hazard – Death or serious injury could result from spilled liquids.
• You must be trained to install or maintain this alarm. 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 working
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 box to prevent
static buildup and discharge.
• In the event of malfunction, contact Morrison Bros. Customer Service.
Steps
1. Verify contents of box. You should have received the gauge, fl oat, installation instructions, re-order/overfi ll
labels, warning tag, cable tie, and optionally the alarm box. Inspect the items for shipping damage. DO NOT use
if damage is found. DO NOT pull and release the cable uncontrollably. This can cause damage to the internal
mechanism and render the gauge inoperable. ALWAYS hold onto cable and allow it to move in a slow steady
motion.
2. Locate the opening, on the top of the tank, where the gauge is to be installed. If possible, select a location
away from the fi ll port to avoid excessive turbulence that could affect the fl oat. Also make certain that there are
no objects inside the tank, near the selected opening, upon which the fl oat and cable could get tangled.
3. Once an opening is selected, measure to the bottom to determine the current liquid level height in the tank.
Record this height in feet and inches (or meters and cm) as you will need it to set the gauge once it is installed.
4. Apply pipe dope or Tefl on tape to the male threads on the gauge. If you have a gauge with female threads,
apply the pipe dope or Tefl on tape to the male threads of the pipe on the tank. DO NOT get pipe dope on the
cable of the gauge.
5. Open the fl oat clip and attach the fl oat clip to the swivel end of the cable. Latch the fl oat clip making sure the
fl oat clip is securely closed.
6. Slowly lower the fl oat into the tank. Guide the cable through your fi ngers letting the cable slide through
slowly. DO NOT allow the fl oat to free fall into the tank as this will cause the cable to come off of the pulley
mechanism and render the gauge inoperable.
918 Clock Gauge
Installation, Operation, and Maintenance Instructions
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