Calibration is a method in which the output reading of a device against a known input is determined to find the accuracy of the device. In some of the cases, calibration may be done to make a device reliable. If a thermometer dipped in cold water is giving 800C on the scale, then it needs calibration. There are many different methods of calibration adopted industrially. There are some devices that need calibration quite often. Alco sensor is one of such devices. The operator of the device must know the calibration method so that he can use the device accurately. A few methods of Alco sensor fst calibration have been mentioned in the device manual. It is quite easy to follow any of these methods to tune the device to give more accurate readings.
Before discussing the complete steps to calibrate the equipment, it is necessary to define some of the terms that have a strong association with the calibration.
Tolerance – it is the maximum error (in percentage) in the reading that is acceptable to the user.
Accuracy – the closeness between the actual readings and the ones shown by the device is known as accuracy
Repeatability – the quality of a device to produce the same results again and again against the same inputs.
Calibration must be done only when the readings shown by the instrument are beyond the tolerance. It must be noted that an instrument is always designed todeliver results in specific environmental conditions. Accuracy cannot be expected if those negotiated conditions are not provided to the equipment.
Set the temperature – the temperature of the unit must be between 150C – 350C. If the temperature does not lie in the range, an error will be displayed on the sensor’s screen.
Select the calibrator fluid – the fluid chosen for the calibration must be in accordance with the instructions given in the manual. It is better to choose wine or vodka for calibrating the equipment.
Standard method – there can be two methods of calibrating the device. The first method is called standard method. In this method, the device is exposed to the fluid at precisely standard conditions. In this case, standard concentration of the fluid must be displayed by sensor (tolerance must be included).
Known concentration method – in this method, a fluid of known concentration is vaporized. The sensor is exposed to the vapor and the concentration displayed by the device is compared with the actual value. The results shown are then saved in the form of tabular data.
Tolerance level – after the calibration, the tolerance level must be between 0.1% and 1%. This will makes the accuracy level to be 99%.
All the fluids cannot be used for Alco sensor fst calibration. Beer, vodka, and ethanol must be preferred to use as the reference fluid while calibrating the device. Other fluids may harm the mouthpiece attached to the foreside of the device. Dry gas can also be used for this purpose. However, the purging time must be set carefully if you are using gas for calibrating the device.