L-770HP--E
1.4 Operating Conditions
In order to maintain metering accuracy and long service life, it is essential that the operating conditions, such
as the flow rate, pressure, and temperature be kept within the specified limits. These operating conditions are
stated in Sections ". SPECIFICATIONS AND PERFORMANCE" and ". PRODUCT CODE EXPLANATION" of
this manual. Do not fail to confirm these items before placing the meter in service.
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If the process fluid is corrosive, meter material must be checked in advance for compatibility.
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Cleanse the interior of flow tube thoroughly after use for measuring fluids that tend to deposit
solids. A flow tube adhered with solid deposits can affect meter accuracy.
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If you need to change operating conditions, consult OVAL sales office or nearest representative.
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Non-uniform gas-liquid multiphase flow or non-uniform solid-liquid multiphase flow may not be
measured properly. consult OVAL sales office or nearest representative for such applications.
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Blanking plug(s) included upon shipment is (are) only for protection of the screw thread during
transportation and will not guarantee explosion-proof or IP performance. Do not install the device
with this blanking plug connected regardless of explosionproof or non-explosionproof.
1.5 Precautions for Installation Location
CAUTION:
To ensure accurate and stable measurement, the Coriolis flowmeter should be
installed in a location where piping vibration will not exceed 0.3G.
1.6 Precautions for power-on
To ensure the stable measuring condition, allow 0 minutes of warm-up period.
1.7 Returning Equipment
If the meter must be returned to OVAL for any reason, follow these steps to ensure the most efficient
processing.
() Clean the unit and flush out the flow tube and pack the sensor unit carefully. Fully document the fluid.
Inadequate information will delay handling of the meter. (
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Fill in the forms prepared on pages and .)
() Enclose complete information about the contents being returned including
model and serial numbers,
the reason for return, return address, and full documentation of the type of fluid in writing.
() Pack the equipment carefully, using the original packing if possible.
() Return the complete flowmeter, including, for instance, the transmitter with all associated components.
Remove the conduit connections and all other parts not originally shipped with the meter (for
example, wiring connections).
Be sure to completely remove the deposit of residue on the inner walls of the sensor unit.
Sensor unit cannot be disassembled for flushing the inner tubes. Malfunction diagnosis or
service repair can not be performed.
1.8 Precautions on Plug
CAUTION:
The explosion-proof / IP rating of this flowmeter are based on condition that
proper pressure-tight packing(s) are used at the plug(s). Blanking plug(s)
included upon shipment is (are) only for protection of the device during
transportation and will not guarantee explosion-proof or IP performance.
If the device is used under an environment where explosion-proof or IP
performance are required, please be sure to use pressure-tight packing(s).
