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# Instrument Percent of Span Error

An important part of performing instrument calibration is determining the extent of an instrument’s error. Error is usually measured in percent of span.

## Instrument Percent of Span Error

Calculate the percent of span error for each of the following examples, and be sure to note the sign of the error (positive or negative):

Question 1:

#### Calculate the percent of span error for Pressure gauge as per the below details.

LRV = 0 PSI
URV = 100 PSI
Test pressure = 65 PSI
Instrument indication = 67 PSI

Question 2:

#### Calculate the percent of span error for weigh scale as per the below details.

LRV = 0 pounds
URV = 40,000 pounds
Test weight = 10,000 pounds
Instrument indication = 9,995 pounds

Question 3:

#### Calculate the percent of span error for thermometer as per the below details.

LRV = -40 o F
URV = 250 o F
Test temperature = 70 o F
Instrument indication = 68 o F

Question 4:

#### Calculate the percent of span error for Ph analyzer as per the below details.

LRV = 4 pH
URV = 10 pH
Test buﬀer solution = 7.04 pH
Instrument indication = 7.13 pH

## Percent of Span Error Formula Error = +2 % of span

Error = -0.0125 % of span

Error = -0.69 % of span

Error = +1.5 % of span

Credits: Tony R. Kuphaldt

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