How to use the node-opcua-data-access.Range function in node-opcua-data-access

const handler = variable.handle_semantic_changed.bind(variable);
        euRange.on("value_changed",handler);

        if (options.hasOwnProperty("instrumentRange")) {

            const instrumentRange =namespace.addVariable({
                propertyOf: variable,
                typeDefinition: "PropertyType",
                browseName: {name:"InstrumentRange",namespaceIndex:0},
                dataType: "Range",
                minimumSamplingInterval: 0,
                accessLevel: "CurrentRead | CurrentWrite",
                value: new Variant({
                    dataType: DataType.ExtensionObject, value: new Range(options.instrumentRange)
                }),
                modellingRule: options.modellingRule ? "Mandatory" : undefined
            });

            instrumentRange.on("value_changed",handler);

        }

        if (options.hasOwnProperty("engineeringUnits")) {

            const engineeringUnits = new EUInformation(options.engineeringUnits);
            assert(engineeringUnits instanceof EUInformation, "expecting engineering units");

            // EngineeringUnits  specifies the units for the   DataItem‟s value (e.g., DEGC, hertz, seconds).   The
            // EUInformation   type is specified in   5.6.3.

// use as automatically scaling a bar graph display
        // Sensor or instrument failure or deactivation can result in a return ed item value which is actually
        // outside  of  this range. Client software must be prepared to deal with this   possibility. Similarly a client
        // may attempt to write a value that is outside  of  this range back to the server. The exact behaviour
        // (accept, reject, clamp, etc.) in this case is server - dependent. However ,   in general servers  shall  be
        // prepared to handle this.
        //     Example:    EURange ::= {-200.0,1400.0}

        const euRange = namespace.addVariable({
            propertyOf: variable,
            typeDefinition: "PropertyType",
            browseName: {name:"EURange",namespaceIndex:0},
            dataType: "Range",
            minimumSamplingInterval: 0,
            value: new Variant({
                dataType: DataType.ExtensionObject, value: new Range(options.engineeringUnitsRange)
            }),
            modellingRule: options.modellingRule
        });


        const handler = variable.handle_semantic_changed.bind(variable);
        euRange.on("value_changed",handler);

        if (options.hasOwnProperty("instrumentRange")) {

            const instrumentRange =namespace.addVariable({
                propertyOf: variable,
                typeDefinition: "PropertyType",
                browseName: {name:"InstrumentRange",namespaceIndex:0},
                dataType: "Range",
                minimumSamplingInterval: 0,