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Advanced Calibration Designs, Inc.
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ACD Advanced Calibration Designs, Inc. Advanced Calibration Designs, Inc.

Advanced Calibration Designs, Inc.

ACD Product FAQ

Questions and answers related to ACD's calibration gas instruments and generators

Q: Does the flow rate affect the output?

A: The flow rate determines the minimum and maximum concentrations. The concentration does not change the output but rather limits it.  We rate our cells at 0.5 lpm.  If you pass a certain current across our cell at 0.5 lpm, the output would be halved at 1.0 lpm.

When you change the flow rate on the CAL 2000, the range of output changes.  If you are flowing at 0.5 lpm, you can choose any output between 0.5 ppm and 50 ppm.  If you have the flow set to 1.0 lpm, you may select any output between 0.25 ppm and 25 ppm.  If you have selected 0.2 lpm of flow, you may select from 1.25 to 125 ppm.  So the real range with one cell is .25 to 125 ppm, this full range can be achieved by altering the flow rate of the instrument.

Q: How is the flow controlled in the GENie QC-1?

The GENie QC-1 utilizes a sealed glass ampoule with an ammonia solution inside as the source for the ammonia gas.  Once the user breaks the vial and places it inside the instrument, the ammonia permeates out of the ampoule at different rates depending on many variables.  The user selects the concentration of calibration that they want, say 50 ppm. The instrument then adjusts the flow rate in order to achieve that output and displays the flow rate to the user.  There is a coarse adjust knob that user can change in order to achieve the concentration that is required.  If the user sets the output to 50 ppm and the instrument then can’t achieve that output, it will give a “output too low” indication.  At that point the user adjusts the coarse adjust knob until the required output can be achieved.  The instrument will stabilize and run at that 50 ppm level and display the flow rate.  The flow will be between 0.2 and 1.0 lpm.

Q: How does the CAL 101 Bump Test instrument track 350 bumps?

A memory chip inside the source keeps track of the number of bumps used and how long the button is pressed down.