Laserfiche WebLink
r� <br /> AIR MONITORING EQUIPMENT <br /> CALIBRATION AND MAINTENANCE <br /> INTRODUCTION <br /> All monitoring instruments must be calibrated and maintained <br /> periodically. The limitations and possible sources of errors for <br /> each instrument must be understood by the operator. It is <br /> important that the operator ensures that the instrument responds <br /> properly to the substances it was designed to monitor. Below are <br /> the calibration and maintenance procedures for the GasTech Model <br /> 1314 combustible gas indicator. <br /> ` GASTECH MODEL 1314 COMBUSTIBLE GAS INDICATOR <br /> The combustible gas indicator must calibrated each week. The <br /> procedure for calibrating the combustible gas indicator is listed <br /> below: <br /> 1. Attach the 0.5 liter per minute fixed flow rate regulator to <br /> the calibration gas cylinder. <br /> 2. Attach a sample line from the regulator to the balloon inlet. <br /> ' Attach another sample line from the balloon outlet to the 11 <br /> sample draw intake on the instrument. <br /> 3. Fill the balloon with calibration gas and allow the sample <br /> F draw prompt to draw it over the sensors. DO NOT OVERINFLATE <br /> BALLOON! Feed more gas into the balloon as needed to keep it <br /> partially inflated. <br /> 4. Wait for the reading to stabilize. Then, using a small <br /> jeweler's screwdriver, adjust the "gas span" pot to obtain a <br /> steady reading which corresponds to the calibration gas <br /> concentration that is printed on the label of the calibration <br /> gas cylinder, (Normally 50% LEL) . <br /> 5. Remove calibration lines. <br /> G. Let the instrument run for one full minute to flush any excess <br /> calibration gas and check readings. The combustible sensor <br /> should now be ready 000% LEL (+ 001% LEL) , in fresh air. <br /> Repeat calibration procedures if necessary. <br /> 7. Combustible calibration complete. <br /> GasTech Model #1314 uses a 2 volt lead gel cell battery. This <br /> battery should be as use dictates. The battery cannot be <br /> �' overcharged.. <br />