CCT Installation Procedures 2

Question 1

When installing a pressure transmitter in a process line, which mounting orientation is typically specified to avoid measurement errors due to head pressure?

Accepted Answer

Horizontal with the diaphragm facing sideways

Answer

Horizontal mounting with the diaphragm facing sideways minimizes hydrostatic head effects on the zero of a pressure transmitter.

Question 2

What is the primary purpose of performing a 'loop check' immediately after installing a calibrated instrument?

Accepted Answer

To confirm the instrument communicates correctly with the control system end-to-end

Answer

A loop check confirms that the entire signal path from instrument to control system reads correctly and alarms activate as expected.

Question 3

During thermocouple installation, what is the minimum insertion depth guideline to ensure accurate temperature measurement?

Accepted Answer

At least 10 times the thermowell stem diameter but no less than 2 inches

Answer

The insertion depth of at least 10× the stem diameter (minimum 2 inches) reduces conduction error along the thermowell stem.

Question 4

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?

Accepted Answer

Distorted velocity profile causing flow measurement error

Answer

Insufficient straight run creates swirl and non-uniform velocity profiles that introduce systematic flow measurement errors.

Question 5

What precaution must be taken when installing a level transmitter using a wet leg configuration?

Accepted Answer

The reference leg fluid must be kept at a constant, known density

Answer

The wet leg fluid density must remain constant so the reference head pressure is predictable and the zero can be correctly set.

(CCT) Certified Calibration Technician Practice Test

(CCT) Certified Calibration Technician Practice Test

CCT Installation Procedures 2