CALIBRATION PROCEDURES ON OUR GAS DETECTORS

 

(1)   First, turn on the appropriate gas monitor/controller.  You will see the meter go up and maybe off the scale.  This is due to the controller when it starts to send the power to and warm up the sensor.  After the sensor gets adjusted with the environment background temperature, the meter will slowly go back to zero.

(2)   After warm up for 4 – 5 minutes, you can either leave the sensor in the open air (no gas present) or introduce pure air through pure air gas bottle and adjust * the meter to zero baseline by adjusting the ZERO potentiometer which is located on the right hand side.  Make sure that the reading is exactly at the zero baseline (Do not go to negative too often).

(3)   Next, you introduce the premixed gas bottle to the sensor.  You will see that the scale reading on the meter will start to move up.  Use the SPAN potentiometer and adjust the meter reading to match the bottle gas PPM reading.

(4)  *(Clockwise increases the reading and counterclockwise decreases the reading).

(5)   **In general, we recommend you check and recalibrate the monitor every three months.** The gas detector when shipped from the factory is pre-calibrated and should be good for 3 months. We strongly recommend that when any of our gas detectors are purchased that the user consider the purchase of our calibration gas mixture kits.  The price may seem high, but the kit can be used for up to 4 – 5 years for calibration purposes. Click here to see page on our various gas calibration kits.  If you drop the sensor or physically damage the sensor, you should check and recalibrate the sensor again.

(6)   If the meter shows a unstable reading (up & down), this is caused by:

a.     Loose wire (not tight) connection

b.     Bad sensor filament

c.      Monitor itself has bad parts

(7)   NOTE:  When using Hydrocarbon gas detectors, some hydrocarbons such as Ethylene will pick up other hydrocarbons gas in the air, such as propane, alcohol, acetone or other solvents.  We suggest you cover the gas sensor with tape in any area being painted.