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

918 Clock Gauge
Installation, Operation, and Maintenance Instructions
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 float 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, fire, explosion, serious
injury or death.
NOTE: The most accurate method to calibrate the tank is with fluid in it. This will take into account variables
associated with the float position, the mechanism, and the fluid density.
NOTE: Switch contact rating: 125V AC/30V DC, 1 Amp maximums
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 modification 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 overfill situation and
should not be the only system in place to prevent a tank from overfilling. 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 specific environment.
• Tanks could be under pressure. Vapors could be expelled from tank vents, piping, valves or fittings while
performing installation. Vapors could catch fire or cause an explosion. Avoid sparks, open flame, 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, float, installation instructions, re-order/overfill
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 in-
ternal 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 fill port to avoid excessive turbulence that could affect the float. Also make certain that there
are no objects inside the tank, near the selected opening, upon which the float 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 in-
stalled.
4. Apply pipe dope or Teflon tape to the male threads on the gauge. If you have a gauge with female threads,
apply the pipe dope or Teflon 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 float clip and attach the float clip to the swivel end of the cable. Latch the float clip making sure the
float clip is securely closed.
3-10-17
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
1
918‑‑‑0188 PP