openlayers 2 - maxScale or minScale don't work in vector (from WFS) layer

var options = 
    {
        projection: "EPSG:900913",
        displayProjection: "EPSG:4326",
        units: 'm'
    };
    map = new OpenLayers.Map('map', options);    

ilceSinir = new OpenLayers.Layer.Vector("İlçe Sınırı",

    {
        minScale: 150000,
        strategies: [new OpenLayers.Strategy.Fixed()], 
        projection: new OpenLayers.Projection("EPSG:4326"),
        protocol: new OpenLayers.Protocol.WFS(
        {
            version: "1.1.0",
            url: "http://localhost:8080/geoserver/wfs",
            featurePrefix: 'topp',
            featureType: "g_ilce_siniri", 

            featureNS: "http://www.openplans.org/topp",
            geometryName: "bounds" 
        })
    });

Scale isn't working, layer is visible at every zoom.

Answer

how about this:

var options = 
    {

        scales: [50000, 100000, 150000],
        minScale: 150000,
        projection: "EPSG:900913",
        displayProjection: "EPSG:4326",
        units: 'm'
    };
    map = new OpenLayers.Map('map', options);

ilceSinir = new OpenLayers.Layer.Vector("İlçe Sınırı",
    {

        strategies: [new OpenLayers.Strategy.Fixed()], 
        projection: new OpenLayers.Projection("EPSG:4326"),
        protocol: new OpenLayers.Protocol.WFS(
        {
            version: "1.1.0",
            url: "http://localhost:8080/geoserver/wfs",
            featurePrefix: 'topp',
            featureType: "g_ilce_siniri", 
            featureNS: "http://www.openplans.org/topp",
            geometryName: "bounds" 

        })
    });

source: http://trac.osgeo.org/openlayers/wiki/SettingZoomLevels