Lead chatter

Ensuring that ventricular pacemaker and defibrillator leads are. space decrease the likelihood of lead chatter. 

Safety valve instability must be avoided. The rapid cycling of the valve from open to closed (chattering) can destroy the valve. Resonance could, in certain circumstances, lead to fracture of the associated piping. Furthermore, the capacity of a safety valve during cycling will be considerably less than if it remained fully open, and is very likely to be insufficient to prevent overpressurisation of the upstream vessel. 

There are two modules in a strip chart the electronics and the mechanical. The trick is to look at one at a time. Disconnect the detector leads, turn off the bed, and watch the pen. Does it sit quietly or chatter up and down Noise at this point comes from the strip chart electronics. If it s quiet, turn on the bed and let the pen trace to see if the baseline is flat. If so, short across the leads and make sure the pen deflects without sticking (this would show up as a plateau in a chromatogram). Lubrication or drive wire replacement would fix the problem. Do not get much oil on the slide bar it just traps dust. Spray some WD40 on a Kimwipe. Wipe the bar, then wipe off the excess. Next, use a stopwatch and time the bed. Is it accurate at 0.5cm/min where you will be using it If it passes these tests, we re ready to hook up the detector leads and move on. 

While at first sight the installation shown in Figure 6.28 seems reasonable, we can see that the size of the inlet riser piping is smaller than the SRV inlet size, which will lead to excessive pressure drop once the valve opens. The valve will chatter and be damaged or even destroyed prematurely. The valve will also not flow its rated capacity and is therefore a hazard. 

Corrosion and chattering of seat can lead to continuous blow off or a leak leading to loss of material. 

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On the basis of the chatter theory, mere inspection of Fig. 1.18(b) leads to the following conclusions ... 

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