EMG MUSCLE SENSOR NOT RESPONDING

Hi, for a project i need the emg sensor to read the value from forearm to run servo motors. I attached the electrodes at my forearm according to most of the electrodes placement described over internet and connect the electrodes cable to my sensor which connects its signal out pin to arduino uno's analog input pin. Further i used the analog read voltage program given in arduino IDE's example sketch. After uploading the code it was supposed to give voltage output between 0-5v when muscle are flexed but it keeps fluctuating around 3 volts regardless of flexing or relaxing muscle. Infact i was getting same result even when the sensor was removed. I dont know what is wrong. It seems that sensor is not responding. Can anyone help me to identify the problem and solve it.

Please provide details of the sensor and your schematic