Replacing the Pump Nozzle and Attaching the Auxiliary Filter

Let us now look at the steps that need to be taken to replace the pump nozzle. You will need to refer to the diagram that is found on page 60 of the owner's manual. You should realize that it is critical that if the nozzle (M5-PN-1) is found to be damaged that it is replaced immediately. This will help to guarantee that there is sufficient pump flow to detect hazardous gases. If this flow is compromised, you can be placed in a dangerous situation; the unit may not be able to adequately detect harmful gases that are present.

First, deactivate your detector. You will note a nozzle slot. GENTLY insert an appropriately sized flat-head screwdriver into this slot. Twist the screwdriver slightly. This will allow you to remove the damaged or broken nozzle assembly. After you remove the old nozzle, reinsert the new one. Make certain that the nozzle post fits securely into the gasket. This fit needs to be tight to ensure adequate gas flow. Once this is accomplished, you will need to reactivate the GasAlertMicro 5. As always, it will perform the mandatory pump test to ensure correct operation.

Attaching an Auxiliary Filter

As the name denotes, this filter is critical in filtering out particulates that may be present in an operating environment. If these enter into the detector, they can cause incorrect readings, foul a sensor and present a dangerous condition. Refer to figure 9 on page 61 to observe an illustration of this process.

To insert the filter (M5-AF-K2), you will first loop the filter cord through the alligator clip (GA-AG-2). Then, pull the filter through the top of the cord. This cord helps to secure the auxiliary filter in place when it is not being used. You will need to pull the cord tight and ensure that the knot is firm. Align the connector between the filter and the detector. Turn clockwise to make certain that the two have mated properly. You can additionally change the filter as is necessary. Remember that environments with high levels of dust and debris will require a filter to be changed more frequently than in a clean atmosphere.

Note that the filter's sole purpose is to protect the pump and the airflow mechanism. If you have an older model pump, a filter MUST be connected when the pump is activated. For newer models (and as mentioned earlier), this filter can be used as an additional safety measure in combination with the normal filter.

Removing and changing filters need to be done only when necessary. So, you will remove a filter when performing bump tests, calibrations and when using a sample probe will require the filter to be removed from the unit. If you require a replacement filter, it can be ordered by referring to the Replacement Parts and Accessories section of your owner's manual. Also, there is a diagram that illustrates this process. It can be found on page 62 of the owner's manual. We will next look at how to attach a sample probe.