Calibrating Trace Hydrogen Sulfide Analyzer Global Organization

Calibrating (Required Components)

• Certified span gas with approximately 50 ppm H2S in background of nitrogen

• - Stainless steel reducing regulator, outfitted with inlet/outlet pressure gauges and CGA 330 connection fitting (note: regulator must have a stainless-steel diaphragm)

• Flexible tubing or a length of stainless-steel tubing

• Tank wrench

Calibrating Steps

• Connect the AMI- supplied non- diffusive flexible tubing or stainless steel tubing from the regulator outlet fitting to the Span inlet gas port.

• Open the Value of the Span Gas Tank and adjust the regulator pressure to approximately 20 psig

• Press the ALARM HOLD OFF button if you are utilizing the alarm feature to avoid an alarm condition.

• Rotate the 3-way SELECTOR VALVE, located on the front panel of the Analyzer, to the Span position and adjust the flow rate to approximately 1 SCFH

• Span the Analyzer to the value of the H2S, specified on the Span Gas Tank, by doing the following: (Press the Span Button and release. The word SPAN will appear on the LCD for 1 second and then display the H2S reading, while the PPM FLAG blinks. Quickly press the appropriate Up/ Down Arrow to adjust the LCD reading to the value stated on your calibration gas cylinder).

• Once Completed, wait for a few seconds. The PPM Flag will stop blinking, and the Analyzer will accept the new calibration

• . Turn the 3- WAY SLECTION VALVE back to the SAMPLE position (the H2S reading will quickly drop to the valve of the pipeline gas).

Important

• The SPAN FACTOR is an indication of the sensor life. The span factor is accurate only after an accurate calibration has been completed. The SPAN FACTOR of a new H2S sensor is in the range of 400 to 600. Over time, as the H2S sensor ages, each calibration should require an adjustment with the UP ARROW BUTTON to correct for any degradation of the electrochemical sensor output (note: the degradation is approximately 1% of the reading per month). When the SPAN FACTOR reaches around 980, it will become necessary to replace the sensor during the next calibration. (If you are calibrating the high range Model 3010BX Analyzer ((0 - 200 ppm)), we recommend a Span Gas > 200 ppm for safety reasons.)