Temperature Sensor Design From Peak Sensors
Calculating and producing effective temperature sensor design can be a tough challenge. Luckily the experts at Peak Sensors are on hand to help you by offering free advice, without all the pushy sales talk.
We can help point you in the right direction
Important Things to Consider When Designing Temperature Sensors
Below is a list of important factors to consider when partaking in temperature sensor design.
- How accurate must the sensor be?
- What is the budget to produce the design?
- What connection demands, if any, are there?
- What is the temperature of the application?
- How big will the probe need to be.
You should consider carefully the accuracy that your new temperature sensor will require. Typically sensors will fully enter a process and be surrounded by the measured medium.However often pipe external surface locations are all that is available. Surface measurements can be made more accurate through improved surface area thermal contact or good insulation design. Clearly the cost is affected by reading quality improvements.
Temperature Sensors are available in different nominal accuracy bands. The tighter tolerance bands cost more. Probes can be calibrated to determine accuracy but again cost is incured by doing so.
Probes need to be securely installed into an application. Often this will provide a pressure seal, a means of replacement, immersion control, enhance a thermal contact or other functions. Standard techniques include compression fittings, flanges, clips etc.
The overall possible temperature range will play a major part in specifying the sensing technology employed. Each type of temperature sensor has a set temperature range at which it will perform:
- Thermocouples cover the widest temperature range, but are non linear devices, they can be very expensive at higher temperatures and when used at extremes suffer from thermal drift.
- Resistance thermometers have a more limited range, but are more accurate than thermocouples. They are linear variable resistors. Novel instrumentation can easily process the signal.
- Thermistors can be very cheap sensors. Most are non linear. The range is even more limited than Resistance Thermometers.
Thermocouples can be very small and still robust. With designs produced down to around 0.25mm in length. Thermistors and Resistance thermometers are larger in size, with a minimum width of around 2mm.
Sensors must withstand the application environment. This usually involves a secondary protective sheath. Stainless Steel is often employed. Common grades include:
Nickel alloys can also be used for higher temperature applications. It is important to remember that many temperature sensor design ideas fail because the important sensor element is not protected heavily enough against the environment.
Signal Generation and Transmission
Thermocouple Signals are provided in micro or milli volt outputs. The signal is always vulnerable to pickup or other interference whilst in the application. Transmitters can convert sensor signals to 4-20mA robust signals. For significant plant transmission. wireless transmission can be used. We know and understand which transmission type is needed for each industrial application.
We are experts in Temperature Sensor Design
There are so many considerations that need to be evaluated during temperature sensor design. The team at Peak Sensors have the skill set and the experience to help you build your new temperature sensor design.