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Airmetrics - Innovative Air Sampling Equipment
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This section identifies common problems and the action necessary to correct them.
  Problem   Solution  

The flowmeter will not zero when a leak check is performed.


Prior to every sample run with the pump running, check for leaks by removing the inlet assembly and covering the quick connect inlet with palm of the hand or a finger. The flowmeter should drop to zero. If not, a leak is present. Check all tubings and fittings for cracks and tightness. Check the pump nozzle connections and the flowmeter for cracks.

NOTE: when checking the fittings for tightness DO NOT use a wrench or other tool to tighten these connections. These fittings are made to be finger tightened. If a leak persists after finger tightening, replace the fitting.


A pump nozzle fitting has broken off.


Jam a small Phillips head screwdriver or tip of penknife blade into hole of broken fitting and turn out counterclockwise.

The charger light on top of battery fails to light when charger is plugged in.


The charging LED on the top of the battery should light briefly even if the battery is already fully charged. If the LED fails to light, either the transformer is defective, the battery is defective, or the battery charger board inside the battery case needs to be replaced.

1) Switch the transformer to the second battery pack. If the LED on this pack fails to light, the transformer is probably defective. If you have a second sampler, use the transformer from that sampler to charge the batteries.

2) Disassemble the battery case using a Phillips screwdriver and connect the battery charger board to another battery. If the same condition results, the battery charger board is defective. If the battery LED lights and the new battery charges, the previous battery is defective.

The battery charger light on the battery top does not turn off after overnight charge.   The battery may be defective, as indicated by the charger light remaining on "high charge" (i.e., the battery fails to hold the charge and the charger continues to charge). Connect a new battery to the battery charger board. If the same condition results, the charger board is defective. If the light turns off, the previous battery is defective.

Battery voltage is less than 12 volts after charging or the battery will not power the sampler for a 24hr run.  

1) Check the battery by connecting a volt-ohm meter (VOM) to the negative and positive battery terminals located on either side of the battery charger light (the negative terminal is odd colored and located next to the sampler catch). If there is no voltage or the VOM readings are intermittent, check that the terminals on the battery cover are tight. If not, see next step.

2) If there is still a voltage problem , remove the battery pack top using a Phillips screwdriver and look for loose connections. The battery charger board should be securely clamped to the banana jacks and connected securely to the battery. Tighten and clean any connections if corroded. Check the battery charging jack for a snug fit with the charging transformer plug. Connect the meter directly to the internal battery terminals. If there is still no or low voltage, see step 3.

NOTE: if loose or corroded connections were found make sure the battery has received a full charge before proceeding with the next step.

3) Even if the VOM meter indicates the correct voltage, perform the following check. Connect a 12-volt light ( such as a automobile headlight ) to the battery to simulate a load. Monitor the battery voltage while connected to the simulated load. The battery voltage should drop and stabilize somewhere between 11.5 and 12 volts. When the simulated load is disconnected the voltage should return to approximately 12.5 volts (within "0.2 volt). If the battery fails to stabilize or does not recover to about 12.5 volts, the battery is most likely defective.

NOTE: make sure when performing these tests the battery is charged and disconnected from the transformer.

The flow rate cannot be accurately adjusted using the Flow Rate Adjustment.   The pump valves and diaphragms are dirty or worn and need cleaning or replacing (see Section 7, Maintenance, "Cleaning/Replacing Pump Valves and Diaphragms").

The flowmeter will not register a high flow rate ( 6 l/m or above). There is no apparent restriction or leak in the plumbing.   The pump valves and diaphragms are dirty or worn and need cleaning or replacing (see Section 7, Maintenance, "Cleaning/Replacing Pump Valves and Diaphragms").

Bags do not fill consistently or significant adjustments to frequency have minimal effect.   Solenoid valve is leaking. The performance of the solenoid valve can be determined by placing a clear piece of tube from the outlet fitting into a few inches of water and watching for any back flow of water into the tube between pulses. If any backflow is present , check that the fittings are tight. If the problem persists, contact Airmetrics.

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