Attaching a Sample Probe

We have just observed how to replace and remove an auxiliary filter from the GasAlertMicro 5. Still, another useful feature of your unit is its ability to detect gases in confined spaces. Also, you can use a sample probe (GA-PROB1-1) to insert into a certain environment before entering yourself (such as a container or shipping unit). This is an additional safety feature that is ideal for situations when you may be uncertain if an unknown environment presents a danger. If course, it is also quite important that you use the probe correctly and never expose it to any sensor poisons or toxins (you can refer to the list of these threats in your owner's manual). You will need to take a look at figure 11 on page 63 to see how the probe and the pump module are attached. Now, let us take a look at the quick and simple process that is involved when you wish to attach a probe to your detector.

Attaching the Probe

You will first need to deactivate your detector. Then, attach the pump connector of the Tygon tubing to the nozzle that is found on the pump module (M5-PUMP).

Note that there may be times when the Tygon tubing can become blocked. This is due to the fact that it is Teflon-lined. To prevent this from occurring, you will need to flare the tubing. This can be done by inserting a pair of needle-nose pliers into the end of the tubing. Using a circular motion, flare the end of the tube (widen the end).

This flared end will then be connected to the sample probe. Make sure that the Teflon lining does not separate from the tubing, as it can block the tube and trigger a pump alarm. Make certain that all connections are tight. Finally, reactivate the detector. It will perform a pump test to verify that there is sufficient air flow to accurately measure gases.

Time Lengths

You should note that the length of the tubing will have a direct effect on how long it will take for the detector to measure the gas. Obviously, longer tubing will require more time to obtain an accurate reading. To solve this problem, it is recommended that you allow three seconds for each foot of tubing attached. Failure to do so may give you incorrect readings or no readings at all.

Let us assume that you have a ten foot length of tubing that stretches from the probe to the detector. In this case, you would allow an additional thirty seconds to ensure that you are receiving accurate readings. 

Also, you will need to make certain that the tip of the probe is free from dirt and debris. If it is partially compromised, you will not receive accurate readings. Again, refer to figure 11 for a graphical representation of the attachment process. We have now finished with the section devoted to attaching additional features to your detector. In the next section, we will look at the datalogger function of the device. For any questions, refer to your owner's manual.