Instrument range shall be selected based on operating range of process to be measured. In common practice, it is recommended to select instrument with full scale range that can give operating process reading between 30% and 70% especially for pressure gauge. The following is an example of selecting pressure gauge range Read More..
The following points provide brief guideline in tubing and fitting design for instrument tubing and fittings. The selection preferences may vary between projects.
- Selection of hook up materials shall consider process fluid pressure and pressure rating to ensure good sealing and integrity. Read More..
To establish a temperature measurement system, electronic temperature instrument needs to be wired to control system . RTD and thermocouple can be directly connected to control system I/O card or through Temperature Transmitter for signal conversion. In most application, temperature transmitter is used to convert RTD/Thermocouple signal and transmit 4-20mA signal, rather than directly wired the RTD or themocouple to I/O card. Read More..
There are several temperature element instrument types widely used to measure temperature of a process substance . These types are categorized into mechanical temperature element and electronic temperature element. Mechanical temperature element uses the principle of thermal expansion i.e. the element expands if the temperature rise and vice versa. Electronic temperature element use the principle of electrical properties change following of temperature variation. Read More..