ACD
Advanced Calibration Designs, Inc.
Certified Calibration Gas Solutions
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ACD Advanced Calibration Designs, Inc. Advanced Calibration Designs, Inc.

Advanced Calibration Designs, Inc.

General FAQ

General questions about ACD calibration gas instruments and generating sources.

Q Why would I buy an ACD instrument rather than a cylinder of cal gas?

A Our gas instruments are more accurate, versatile, price effective and environmentally friendly than cylinders.

Q How do the instruments work?

A There is a liquid containing generating source inserted into the instrument. Current is passed through the source and calibration gas is generated on demand and blended with air to create calibration gas or it simply permeates out and is blended with air to create calibration gas.

Q How do I know how much calibration gas I have left?

A Each instrument has an indicator that warns the user before he runs out of cal gas.

Q How long do the calibration gas sources last?

A We have a range of gas sources that run from 2 to 100 hours of use, roughly the equivalent of 2 to 100 cal gas cylinders at a fraction of the cost.

Q Can I use one instrument to generate more than one type of cal gas?

A Most instruments can be used with several gas sources. For instance, you can have one CAL 2000 instrument and five different generating sources for it.

Q Does altitude or temperature effect the instrumentation?

A Yes, but the instrumentation ranges from all internal self adjustment to easily user adjustable settings.

Q What does it mean when my instrument reads 'source failure'?

A Usually it means that the instrument is not recognizing the source. Check the four pin connector and ribbon connector for corrosion and clean if necessary. It may also mean that the electrolyte level of the generating source is low. The level should be about < from the top. Distilled water can be added if necessary.

Q What does it mean when my instrument reads 'flow too low'?

A 'Flow too low' means that the internal pump in the instrument cannot achieve the flow rate you have set the instrument to operate at. Look for a restriction in the calibration equipment such as a kink in the hose or a small orifice in the calibration cup. Insure free flow for the instrument through the calibration equipment.

Q Why is my instrument reading flow too low?

A The  CAL 2000 instrument has an internal mass flow sensor that measures the flow through the unit and is used to control the flow.  If the sensor is not seeing the flow that the user has asked for, it shows a flow too low error and then shuts off.  The reason for this is so that the calibration gas concentration is accurate.  Typical reasons for the flow too low error include flow restrictive calibration adaptors, as well as customers who are trying to calibrate a sample drawing sensor with a lower flow rate than our unit is providing.  Sample drawing systems can be calibrated by setting the flow to zero on the CAL 2000 and attaching the hose to the sensor.  The CAL 2000 will read the sample draw flow and then you may set the desired calibration of calibration gas and calibrate the sensor.  If calibration adaptor is too restrictive, the restriction needs to be reduced so that the pump in the CAL 2000 can achieve the desired flow rate.

If there seems to be no external issues, the problem may be with the pump itself.  The pump is pressed into place and can be knocked out if the instrument takes a good fall.  If that occurs, simple placing the pump back into its’ place and the problem should be solved.  If the pump is installed correctly but still failing it may be because of the rotary vanes in the pump.  These vanes throw out when the motor turns and can get jammed by dust.  If you suspect that this is the  problem, the pump can be removed by gently siding it straight back from the hose connectors.  Compressed air can be forced though the pump through the nipples on the top of the pump and this very often will dislodge the dirt in the pump and the pump can be reinstalled in the instrument and will often solve the problem.

Q My instrument is due for calibration, what do I need to do?

A Contact Customer Service to obtain an RMA #.