Emerson IP221 appendix Protection of permanently installed equipment, Explanation of symbols

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Warning :

If this equipment is used in a manner not specified by the manufacturer, the protection provided may be impaired. All installation and commissioning of this equipment must be carried out by electrically competent persons.

Protection of permanently installed equipment :

This equipment is regarded as permanently installed equipment. Ensure wiring is suitable for the load current and the insulation is suitable for the voltage, temperature and environment of the installation.

A supply disconnection device must be included in the installation, fitted as close as practical to and not be obstructed by the equipment. It must be double pole and marked as the disconnection device. Each relay circuit must be protected by a fuse not exceeding the maximum rated current for the relay as specified in the manual.

On wall mount unit disconnect supply before removing control unit from base. Control units must be correctly assembled to achive stated IP ratings.

Explanation of symbols :

The IEC symbols used on the equipment are as follows :

!Refer to Manual.

The Protective earth terminal must be connrected to an external Protective earthing system.

Functional earth terminal. f this terminal is used it must be connected to an external earthing system at the same potential as the protecive earthing system.

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Contents Installation ContentsSafety Information Introduction Fault Finding Specification and descriptionProtection of permanently installed equipment Explanation of symbolsHi-Sens cylindrical sensors SensorsGap sensors Interface detection Attenuation method Figure Reflection Method FigureNormal acting head amplifiers Solids Density DetectionHead Amplifier Units Sensor State Output Ii Inverse acting head amplifiersType Industrial Case Marine Control UnitsInstallation 2.1 Calibration Head amplifier internalsIii Interface Sensors Attenuation Method Calibration procedure by sensor type Hi-Sens SensorsIi Gap Sensors Iv Interface Sensors Reflection Method Sludge SensorSensor and head amplifier installation Adjacent head amplifier mounting detailsPage Control unit installation Wiring CableRelay Ratings Ii Head Amplifier UnitIii Control unit Control Unit Connections II 1 G EExia IIC EN 50014 & EN Intrinsically safe installationCertificates of Conformity Unit not switching Fault FindingFault indicated Relay contacts not changingSensor specification Head AmplifiersTemperature Range Power consumptionIntrinsic safety HousingRack Mounted Unit Recommended Spare Parts 5.1 Sensor and head amplifierStandard Control Unit Options Intrinsic Safety Mounting Sensor Type Test SwitchAppendix I Part Numbers Sensor ConnectionIntrinsic Safety Mounting Mains Voltage Output Relay RacksAppendix II List of illustrations Section Title Appendix III List of tables Section TitleMaintenance / Inspection Abcdef International Americas