Thermocouples 101

Which type of RTD is used when very high accuracy is needed?

What is the advantage of using a 3-wire RTD over a 2-wire RTD?

What type of temperature device exhibits a positive change in resistance for a positive change in temperature?

Which standard instrumentation signal is most commonly used for temperature measurement?

Which type of process measurement detects the process variable within a range of all possible values at all times?

Which type of measurement device is in direct contact with the process and may change the process or be a source of contamination?

Which term refers to the difference between the desired setting of the process variable and the current measured condition of the process?

What is the lowest value that corresponds to the bottom or lowest limit of the process called?

Which two colors are used to identify the 'J' type thermocouple?

What is the purpose of the HART protocol?

What is the process variable represented by 'URV' in the HART protocol?

Why does HART communication require a minimum loop resistance?

According to the text, what is the formula to convert the nonstandard signal input (°C) into a percent?

According to the text, what is the formula to calculate the output into the standard signal (mA)?

Based on the given information, what should the psi output signal be if the input range is 4-20mA and the PV is 13.6 mA?

According to the text, what is the simplified formula for cold junction compensation?

Which organization is responsible for standardizing P&ID symbols?

What is the span of a thermometer with a scale from -40°C to 100°C?

What is the purpose of a transmitter in process control?

What is the most common material used for resistive temperature detectors (RTDs) in industry?

Which type of level measurement involves detecting the level of solids as well as liquids?

Why are regular performance verifications necessary for process instrumentation?

Which quality program dictates periodic calibration to recognized standards for all instruments that impact product quality?

What are some factors that can cause the performance of instruments to change over time?

What are some problems that regular performance checks can uncover?

What is level measurement?

According to the text, what are the basic electrical equations used in instrumentation?

What is the order of operations for solving equations?

What is the formula to calculate the percentage of a process variable?

What is the formula to convert a percentage to a standard signal?

Point Measurement detects the process variable at a predetermined ______ or value

Continuous Measurement detects the process variable within a ______ of all possible values at all times

Direct or Invasive Measurement: The measurement device will be in direct ______ with the process

Indirect or Non-Invasive Measurement: No ______, good for extreme processes

_______ are parts of the process control that perform the function of measuring and changing the process.

Devices that measure the process are called _______.

Instrumentation devices that convert non-standard signals to standard instrumentation signals are called _______.

According to the text, what is the formula to convert the nonstandard signal input (°C) into a percent?

Devices that create changes in a process are called _______.

What is the lowest value that corresponds to the bottom or lowest limit of the process called?

What is level measurement?

Why are regular performance verifications necessary for process instrumentation?

An RTD is a temperature device/sensor that will exhibit a positive change in ______ for a positive change in temperature.

The 2-wire RTD is only used for short distances and where high accuracy isn’t necessary because you are adding the resistance in the leads to the resistance of the ______.

The 3-wire RTD is the most common because you can subtract the ______.

The 4-wire RTD is used when very high accuracy is needed. With the 4-wire configuration, the instrument will pass a constant current (I) through the outer leads. The addition of the two additional leads makes it possible to eliminate errors due to change in ______ resistance.

According to the text, the HART protocol provides data between intelligent field instruments and DCS/PLC or handheld communicators through ________ communication.

The HART protocol makes use of Bells 202 Frequency Shift Keying (FSK) standard to superimpose digital information on the conventional 4-20 mA ________.

The microprocessor-based field devices that offer better accuracy, long-term stability, and reliability than conventional analog instruments are known as ________ instruments.

The HART protocol uses analog and digital ________ simultaneously for communication.

According to the text, what is the formula to convert the nonstandard signal input (°C) into a percent?

Based on the given information, what should the psi output signal be if the input range is 4-20mA and the PV is 13.6 mA?

According to the text, what is the simplified formula for cold junction compensation?

What is the purpose of the HART protocol?

Regular performance verifications with a suitable reference standard, are necessary because regulations governing occupational safety, environmental protection, and consumer safety often require evidence of traceable calibration for process instrumentation. Quality programs, such as ISO 9000, dictate periodic calibration to recognized standards for all instruments that impact product quality. Calibration is still required The performance of instruments will changeover time with exposure of the transmitter and the primary sensing element to temperature, humidity, environmental pollutants and vibration. Regular performance checks can uncover problems not directly caused by the equipment such as plugged impulse lines, or pressure lines that have become filled with condensate. Or the wrong ______ type installed.

Level detection of solids can be more difficult than with liquids because solids will not take the shape of the vessel and can bridge the detection points (Primary Elements). In defining level measurement, we can say that : Level measurement is the act of detecting the interface or ______ between.

Level measurement is divided into two familiar types of detections. ______ and Continuous level measurement.

Regular performance verifications with a suitable reference standard, are necessary because regulations governing occupational safety, environmental protection, and consumer safety often require evidence of traceable calibration for process instrumentation. Quality programs, such as ISO 9000, dictate periodic calibration to recognized standards for all instruments that impact product quality. Calibration is still required The performance of instruments will changeover time with exposure of the transmitter and the primary sensing element to temperature, humidity, environmental pollutants and vibration. ______ performance checks can uncover problems not directly caused by the equipment such as plugged impulse lines, or pressure lines that have become filled with condensate. Or the wrong thermocouple type installed.

Level measurement can involve detecting the level of solids as well as ______‘s.

Introduction to Level Measurement Level is simply the height that some material fills a container. Level measurement is an integral part of process control systems for inventory control, quality and safety. Level measurement is divided into two familiar types of detections. Point and Continuous level measurement. Level measurement can involve detecting the level of solids as well as ______‘s. Level detection of solids can be more difficult than with liquids because solids will not take the shape of the vessel and can bridge the detection points (Primary Elements). In defining level measurement, we can say that : Level measurement is the act of detecting the interface or boundary ______.