Monitoring frequency

For routine monitoring, frequency will be influenced by the level of exposure. The further the levels depart from the standard, the less the need for routine monitoring. A suggested guide is ... 

The sampling and monitoring frequencies specified in the Site B site contractor s SSAHP were not consistent with HAZWOPER requirements since the plan based monitoring frequency on prior sampling results alone and did not consider other factors such as the performance... 

Like displacement probes, velocity transducers have an effective frequency range of about 10 to 1000 Hz. They should not be used to monitor frequencies above or below this range. 

Beware that this type of coupling often may go undetected in a normal vibration analysis. Since the ghost frequencies are relatively high compared to the expected real frequencies, they are often outside the monitored frequency range used for data acquisition and analysis. 

After the initial or baseline of the machinery, the frequency of data collection will vary depending on the classification of the machine-trains. Class I machines should be monitored on a two to three week cycle Class II on a three to four week cycle Class III on a four to six week cycle and Class IV on a six to ten week cycle. This frequency can, and should, be adjusted for the actual condition of specific machine-trains. If the rate of change of a specific machine indicates rapid degradation, you should either repair it or at least increase the monitoring frequency to prevent catastrophic failure. 

Narrowband limits, i.e. discrete bandwidth within the broadband, can be established using the following guideline. Normally 60 to 70 per cent of the total vibration energy will occur at the true running speed of the machine. Therefore, the absolute fault limit for a narrowband established to monitor the true running speed would be 0.42 ips-peak. This value can also be used for any narrow-bands established to monitor frequencies below the true running speed. 

Absolute fault limits for narrowbands established to monitor frequencies above running speed can be ratioed using the 0.42 ips-peak limit established for the true running speed. For example, the absolute fault limit for a narrowband created to monitor the bladepassing frequency of fan with 10 blades would be set at 0.042 or 0.42/10. 

Monitoring frequencies required for the specific value of n if the duration of study was one year. 

Monitor frequency of patient exacerbations. Frequent exacerbations, unscheduled clinic visits, emergency department visits, and hospitalizations due to asthma may indicate a non-adherent patient or the need to step up long-term control medications. 

Drug Class or Drug What to Monitor Frequency Endpoint... 

Sampling plan. To determine the number of samples, the areas are reviewed for criticality. Samples are taken from representative location at frequencies specihed in the respective procedures. The sampling frequencies are based on the environmental classihcations per current USP. The sampling plans shall be dynamic with monitoring frequencies and sample plan locations adjusted based on trending performance. It is appropriate to increase or decrease sampling based on this performance. 

Room Activity/Works Area Position for Routine Monitoring Position for Intensive Monitoring Frequency Alert Limit Action Limit... 

Activity Room Monitoring Monitoring Frequency Limit Limit... 

Wentholt IM, Maran A, Masurel N, Heine RJ, Hoekstra JB, DeVries JH. Nocturnal hypoglycaemia in Type 1 diabetic patients, assessed with continuous glucose monitoring frequency, duration and associations. Diabetic Medicine 2007, 24, 527-532. 

It is common practice for firms to interrupt their aseptic processes when atypical total particulate excursions are observed so that the scientists and engineers can determine the source of the foreign material. Monitoring frequency and expectations in the less critical environments is always reduced relative to the critical aseptic environments. 

Microbalance Impacting on oscillator and monitoring frequency change -b... 

If results are over an alert limit, but not over the action limit, then enhance monitoring frequency for X cycles. (X is determined by the critical level of the area and process where the over-limit event occurred, but should provide an adequate interval to assure detection of a continued deterioration of process control.)... 

---