Analog to Smart Transmitters

Question 1

Pneumatic transmitter that measures process sensor variable and converts the value into a proportional value into a standard output signal (3-15 psi, 20 to 100kPa)

Answer 1

Analog Transmitter

Question 2

Electronic transmitter that uses operational amplifiers circuitry to convert process sensor variable to a proportional current output (4-20 mA)

Answer 2

Analog Transmitter

Question 3

Sensor analog value is converted to digital value that is fed to a microprocessor for processing then the digital signal is converted back to analog output (HART)

Answer 3

Digital Transmitter

Question 4

digital value after sensor is used as digital signal output (Foundation Fieldbus, Profibus etc)

Answer 4

Digital Transmitter

Question 5

Analog Outputs

Answer 5

Process output in standard format (3-15psi, 4-20mA etc)

Question 6

Electronic output (4-20 mA) with HART and other Digital Outputs (FF)

Answer 6

Digital Outputs

Question 7

Limited, requires numerous transmitters to cover all values

Answer 7

Analog Input range

Question 8

Larger turndown ratio’s Fewer transmitters required

Answer 8

Digital Input range

Question 9

Analog Re-range

Answer 9

Need to re-calibrate to change range

Question 10

Entered with communicator(or PC) Relatively fast

Answer 10

Digital Re-range

Question 11

Input known value, interactive Zero & Span adjust screws

Answer 11

Analog Calibration

Question 12

Digital Calibration

Answer 12

Input known value, non- interactive Zero-Lower-Upper Trim

Question 13

Analog Accuracy

Answer 13

Good accuracy, temp Press effects output

Question 14

Good accuracy, temp.-press. effects compensated for

Answer 14

Digital Accuracy

Question 15

No diagnostics onboard, needs to be checked

Answer 15

Analog Diagnostics

Question 16

Transmitter able to communicate its “health” back to user

Answer 16

Digital Diagnostics

Question 17

Limited number available, generally not in production

Answer 17

Analog Availability

Question 18

Common among all manufactures, readily available

Answer 18

Digital Availability

Question 19

The set of rules defining a format is called a

Answer 19

protocol

Question 20

– HART
– MODBUS
– FOUNDATION FIELDBUS
– PROFIBUS

Answer 20

Examples of Instrumentation Protocols

Question 21

HART is an acronym for what?

Answer 21

Highway Addressable Remote Transducer

Question 22

Protocol for sending and receiving digital information across analog wires between smart devices and control or monitoring equipment

Answer 22

HART

Question 23

List five reasons to use a smart device

Answer 23

Device Configuration or re-configuration
Device Diagnostics
Device Troubleshooting
Reading the additional measurement values provided by the device
Device Health and Status

Question 24

The HART Protocol communicates at

Answer 24

1200 bps

Question 25

HART primary/secondary protocol mean

Answer 25

which means that a smart field (secondary) device only speaks when spoken to by a primary

Question 26

HART signal interrupts the 4-20 mA output signal of a device

Answer 26

FALSE

Question 27

device status, diagnostics, additional measured or calculated values, etc

Answer 27

device information carried on the digital HART signal

Question 28

benefits of using HART Communication

Answer 28

Leverage the capabilities of a full set of intelligent device data for operational improvements.
Gain early warnings to variances in device, product or process performance.
Speed the troubleshooting time between the identification and resolution of problems.
Continuously validate the integrity of loops and control/automation system strategies.
Increase asset productivity and system availability.
Increase Plant Availability
Reduce Maintenance Costs
Improve regulatory compliance

Question 29

HART-Device Description

Answer 29

an electronic data file prepared in accordance with Device Description Language specifications

Question 30

HART Device Description Language (DDL)

Answer 30

language to describe devices