Installation Procedures Flashcards
7 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Installation Procedures flashcards as text
When installing a pressure transmitter in a process line, which mounting orientation is typically specified to avoid measurement errors due to head pressure?
Answer: Horizontal with the diaphragm facing sideways
Horizontal mounting with the diaphragm facing sideways minimizes hydrostatic head effects on the zero of a pressure transmitter.
What is the primary purpose of performing a 'loop check' immediately after installing a calibrated instrument?
Answer: To confirm the instrument communicates correctly with the control system end-to-end
A loop check confirms that the entire signal path from instrument to control system reads correctly and alarms activate as expected.
During thermocouple installation, what is the minimum insertion depth guideline to ensure accurate temperature measurement?
Answer: At least 10 times the thermowell stem diameter but no less than 2 inches
The insertion depth of at least 10× the stem diameter (minimum 2 inches) reduces conduction error along the thermowell stem.
A flow meter manufacturer specifies a minimum number of straight pipe diameters upstream of the sensor. What installation error occurs if this requirement is not met?
Answer: Distorted velocity profile causing flow measurement error
Insufficient straight run creates swirl and non-uniform velocity profiles that introduce systematic flow measurement errors.
What precaution must be taken when installing a level transmitter using a wet leg configuration?
Answer: The reference leg fluid must be kept at a constant, known density
The wet leg fluid density must remain constant so the reference head pressure is predictable and the zero can be correctly set.
When installing an RTD in a thermowell, why is it important to use thermally conductive compound between the RTD and the thermowell bore?
Answer: To improve thermal contact and reduce response time lag
Thermally conductive compound fills air gaps between the RTD and thermowell bore, significantly reducing thermal resistance and response lag.
Which installation practice is essential when mounting an electromagnetic flow meter to ensure it operates correctly?
Answer: Ensuring the pipe is always full and the meter is not installed at a high point where air can accumulate
Electromagnetic flow meters require a full pipe to complete the conductive path between electrodes; air pockets cause erratic or zero readings.