2
Morrison Bros. Co. - Dubuque, IA - 800-553-4840
918---0188 PP rev8.12.13
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7. Once the fl oat is resting on the liquid level (or tank bottom if the tank is empty) thread the gauge into, or
onto, the tank fi tting. Use a pipe wrench or strap wrench, on the large hex at the bottom of the gauge, to tighten
the gauge into, or onto, the tank fi tting.
8. Remove the back plate retaining ring and back metal cover from the gauge. Hold the large pulley wheel in
place and loosen the thumb nut (Figure 1). Insert a small fl at blade screwdriver into the slot on the end of the
shaft. Rotate the shaft with the screwdriver, which will move the gauge hand, until the gauge hands indicate the
level that you recorded in Step 3. Note: Short hand indicates feet (or meters) and long hand indicates inches (or
cm).
9. Once you have the hands in the correct position, hold the screwdriver fi rmly in position and tighten the thumb
nut on the shaft.
10. Remove the front face retaining ring and remove the clear front cover.
11. To calibrate the alarm setting, rotate the thumb nut counterclockwise (when facing rear of gauge, see Figure
4) to the desired alarm set point (see Figure 5). This will raise the fl oat assembly out of the liquid. Be careful
to maintain a fi rm grasp of the thumb nut to prevent free fall of the fl oat. While holding the thumb nut steady,
adjust the Alarm hand by pulling the alarm pointer out and rotating it to the point of the triangle (see Figure
6). Once set, carefully allow the fl oat to drop by turning the thumb nut clockwise (when facing the rear of the
gauge).
Figure 4: Raising the fl oat Figure 5: Hold thumb nut at Figure 6: Setting Alarm pointer.
with thumb nut to desired desired trip point. Example - Example - Alarm will now sound
alarm trip point. Alarm set point at 9 feet-0 inches. when level reaches 9 feet - 0 inches.
12. If installing the alarm box, leave the gauge front and rear covers removed. If the alarm box will not be
installed, or will be installed at a later date, replace the front and rear covers of the gauge.
Alarm Installation and Testing
Refer to 918 Series Alarm Installation, Operation and Maintenance Instructions (918S--0142 PP)
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.
Shaft &
Thumb Nut
Large Pulley
Wheel
Fig. 1
STANDARD VERSION
Small hand = Feet
Large hand = Inches
EXAMPLE:
Clock reads 9:27;
Liquid level is 9 feet,
5.25 inches.
Fig. 2
METRIC VERSION
Small hand = Meters
Large hand = Centimeters (x10)
EXAMPLE:
Liquid level is 2 meters,
40 centimeters.
Fig. 3
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