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There are camps with activities as traditional as model rocketry and riflery and those that are nontraditional such as aviation, computers, language studies, golf, martial arts or community service. There are overnight summer camps with a focus on self-improvement, weight loss and grief counseling too. Selecting an overnight summer camp for your child, teen or other children deserves a great deal of consideration and attention to even the smallest details.

Planning early is important; you should be diligent in your efforts to visit camps during the peak season to make plans in advance of the upcoming camping year. The more artistically minded might want to consider arts and crafts, clowning, drama, photography, or dance to be important elements of having a well-rounded camp experience. Basically, if you can think of any subject area, there's probably a camp that specializes in it.

Special needs camps try to meet the needs of a wide range of children with disabilities; these camps provide an outdoor summer camp experience along with a therapeutic environment. Generally camps are divided by gender - girls only, boys only, or co-ed and again by age group. Selecting the right camp that fits with your child or teen's interests, special interests, needs, special needs and abilities is one of the first steps

Try to determine whether the camp director incorporates a similar philosophy to running the camp as you do in parenting your child or children. The best overnight summer sports camps do much more than try to improve a camper's soccer, tennis, lacrosse, or wrestling skills - they help each child become a more skillful athlete, a more gracious competitor, a more committed team player and a more confident person. Is there a special topic (e.g. religion, sports, educational, performing arts, arts and crafts) that you want your child will gain ability and experience in?

camp tuition can be expensive; similar to travel insurance, there are now insurance policies for families sending their children to overnight summer camp to cover a last minute cancellation, homesickness, any medical emergency and emergency evacuations. You child or teen could typically explore subjects new to them like marine science, photography, creative writing, community service, drama, magic, scuba diving, video production, comic book design, crime scene forensics, cooking, yoga, rappelling, etc. If you have more than one child do you think, they would benefit from attending the same summer camp together?

Visit the camp; you can view campers and counselors in their element, witness activities as they occur, and just get an overall feel for the camp - something that cannot be accurately experienced when the camp is closed. Children will get more individual attention and supervision with fewer campers per counselor. non-profit camps often range anywhere from $1200 to $3000 for four weeks and $2500 to $5000 for eight weeks.

Although camp counselor jobs don't usually pay very well, minimum wage or less, counselors receive free room and board; many take the job primarily for the camping experience. And most camp counselors are in their late teens or early twenties and are high school and college students on their summer break. There are many types of overnight summer camps with a focus on education that cater to students of differing ages and academic interests.

If you find a traditional overnight summer camp or sleepaway camp that is not the right fit, or an expense that isn't possible at this place in time, know that there are other options that can keep your child occupied throughout the summer. Look over and evaluate the fliers, brochures and promotional materials; read the fine print. If you think there's a possibility you might have to cancel an overnight summer camp reservation, then camper's insurance is a good idea. The summer is a key time to visit overnight summer camps or sleepaway camps because you can determine whether they'll be the right fit for your child, children or family while the camp is in full operation.

For more information on choosing the best overnight summer camp and finding the best sleepaway or overnight summer camp online and offline go to http://www.OvernightSummerCamp.biz a nurse's website specializing in overnight summer camp tips, help, facts, free tuition resources, including information on overnight summer camp reviews

What is a PID controller?

A PID (Proportional Integral Derivative) controller is a common instrument used in industrial control applications. A PID controller can be used for regulation of speed, temperature, flow, pressure and other process variables. Field mounted PID controllers can be placed close to the sensor or the control regulation device and be monitored centrally using a SCADA system.

Example: Temperature control using a Digital PID controller

A typical PID temperature controller application could be to continuously vary a regulator which can alter a process temperature. This may be a pulsed switching device for electrical heaters or by opening and closing a gas valve. A heat only PID temperature controller uses a reverse output action, i.e. more power is applied when the temperature is below the setpoint and less power when above. PID control for injection and extrusion applications often employ additional cooling control outputs and usually require multiple controllers.

A PID controller (sometimes called a three term controller) reads the sensor signal, normally from a thermocouple or RTD, and converts the measurement to engineering units e.g. Degrees C. It then subtracts the measurement from a desired setpoint to determine an error.

The error is acted upon by the three (P, I & D) terms simultaneously:

PID controller Theory

The following section examines PID controller theory and provides further explanation of the question `how do PID controllers work'.

Proportional (Gain)

The error is multiplied by a negative (for reverse action) proportional constant P, and added to the current output. P represents the band over which a controller's output is proportional to the error of the system. E.g. for a heater, a controller with a proportional band of 10 deg C and a setpoint of 100 deg C would have an output of 100% up to 90 deg C, 50% at 95 Deg C and 10% at 99 deg C. If the temperature overshoots the setpoint value, the heating power would be cut back further. Proportional only control can provide a stable process temperature but there will always be an error between the required setpoint and the actual process temperature.

Integral (Reset)

The error is integrated (averaged) over a period of time, and then multiplied by a constant I, and added to the current control output. I represents the steady state error of the system and will remove setpoint / measured value errors. For many applications Proportional + Integral control will be satisfactory with good stability and at the desired setpoint.

Derivative (Rate)

The rate of change of the error is calculated with respect to time, multiplied by another constant D, and added to the output. The derivative term is used to determine a controller's response to a change or disturbance of the process temperature (e.g. opening an oven door). The larger the derivative term, the more rapidly the controller will respond to changes in the process value.

Tuning of PID controller Terms

The P, I and D terms need to be "tuned" to suit the dynamics of the process being controlled. Any of the terms described above can cause the process to be unstable, or very slow to control, if not correctly set. These days temperature control using digital PID controllers have automatic auto-tune functions. During the auto-tune period the PID controller controls the power to the process and measures the rate of change, overshoot and response time of the plant. This is often based on the Zeigler-Nichols method of calculating controller term values. Once the auto-tune period is completed the P, I & D values are stored and used by the PID controller.