Maintenance And Checking - Oval ALTI mass CA00A Instructions Manual

10.6.7 Maintenance and checking

In order to use OVAL' s Coriolis Flowmeters for long period of time, please perform inspection and
maintenance according to the following items. Also, make sure to check and inspect the Flowmeter while
de-energizing without hazardous gas in the surrounding area.
Check item
General Is the dedicated cable being used ?
If it is having a mixed touch with other cables, particularly with power supply
lines ?
If the coating is damaged or peeling off ?
Is the dedicated cable properly connected ?
Is the terminal end properly treated ?
Is the separation cover installed ?
Is the lid for the terminal box installed ?
Are bolts and hex socket set screws for fastening the transmitter loose ?
Grounding
Is the grounding made properly ?
Is the screw for the grounding terminal loose ?
If the grounding wires are deteriorated ?
Sensor
Drive circuit resistance: Resistance range: 50 to 5kΩ *1
Pick-off circuit resistance: Resistance range: 60 to 600Ω *1
Temp. sensor circuit resistance: (100+0.385×Temp.) Ω
*1: There are some differences depending on each sensor and fluid temp.
*2: This measurement is possible only with the separate type. If measured at
If any of the connections of display lid, terminal lid or side lid are loose ?
Transmitter
If the part tightened up of cable gland loose ?
Is the packing of the cable gland discolored, hardened, torn, or cracked ?
Is the enclosure and glass deformed or has crack or such ?
*Paint is not regarded to be enclosure.
About handling of grease on bonded surfaces:
If short and deterioration of the grease on the parts below are found through normal use, replenish grease
properly. For this purpose, periodic check is recommended.
Parts screw used: Terminal box – lid (separately mounted only)
the transmitter side, the interconnection resistance of dedicated cable is
added.
Description
L -- 740 -- 28 -- E
Check
1