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Once the bung opening is verified to be a good Ultrasonic installation, ensure the bung
threads have not been compromised. The Ultrasonic Prophet is now ready to be placed
into service.
3.10
Mounting a Differential Pressure Unit
Differential Pressure Prophets operate by measuring the pressure (weight) of the liquid
the sensor is submerged into. This pressure is proportional to the density of the liquid.
The opening on the end of the sensor contains an exposed diaphragm which responds to
changes in liquid pressure as the tank is filled or emptied with product. This measured
pressure is compared against atmospheric pressure, and is converted to a readable signal
by a microprocessor in the Prophet.
Please note that the sensor and sensor cable must be clean when installed, to avoid
contamination of the contents of the tank. These tanks are inspected for product
contamination, and the Prophet installation cannot compromise the product in the tank.
Care must be taken before and during installation to not strike the sensor against any
stationary surface. This can frequently occur during installation of the probe into the
tank. Shock may damage the probe causing it to fail prematurely.
CAUTION:
¾
Do not
install the sensor in a liquid that is susceptible to freezing or at the
bottom of a tank with water in it that may freeze. If the liquid freezes, it will
damage the probe which will not be covered under warranty.
¾
Do not
install the sensor in a tank with a mechanical agitator.
¾
Do not
drop or strike the sensor against a solid object. This may damage the
sensor or cause a shift in the output of the probe.
¾
Do not
kink the probe cable. This could restrict the breather tube in the cable
and cause fluctuating readings.
¾
Do not
install the sensor where sludge or sediment can clog the probe
opening. If necessary, suspend the sensor above the maximum level of the
sediment.
¾
Do not
cut the sensor cable. The length is not user-adjustable and this will
void the warranty.
¾
Do not
use the Prophet housing to screw the unit into the tank. Use only the
wrench flats on the bottom fitting.
Typically there will be more cable than what is required for the sensor to reach the
bottom of the tank. If this “slack” cable can cause a problem, if should be looped and
secured using plastic or non-metallic ties, so the loop will not come apart. A correct
installation will result in the sensor just slightly resting at the bottom of the tank, with all
excess slack secured in the loop. There should not be enough excess cable for the sensor
to enter into the discharge piping. Refer to Figure 6. Verify that the sensor and cable
