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ManualsBrandsFLUKE CALIBRATION ManualsTest Equipment9100S-B-256 Calibrator Temperature Calibrated to Manufacturer's standards (with certificate)

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754

DOCUMENTING PROCESS CALIBRATOR

Null

modem

Interface

cable

Dry-well (3.5 mm)

Dry-well

(DB9)

Hart Dry-well cable kit,

P/N 2111088

3.5 mm

interface cable

Fluke Calibration

Fluke Calibration

Fluke Calibration

5

Record the As-Found test

either using Auto-Test, with

the settling time for the dry-

well in the test delay time, or

manually while observing for

stable test temperatures.

After the As-Found test select

“Adjust” and select “Yes” when

prompted to use a dry-well for

adjusting the transmitter in-

put. The applied temperature

and adjustment will adjust the

transmitter input block to out-

put the correct measurement

by adjusting the transmitter

and sensor’s output together.

After adjusting the input

with sensor, adjust the

transmitter mA output using

“Output Trim.”

After adjustment is completed,

record the post adjustment

of the transmitter As-Left

and errors of the input.

Sensor and output errors

of the transmitter should

be nominalized, resulting

in improved temperature

measurement performance.

Remove the process measure-

ment sensor and install into the

dry-well temperature calibrator.

Connect the mA measure-

ment jacks of the 754 to the

transmitter and connect the

dry-well communication cable

between the 754 and the

dry-well.

Press HART to query the trans-

mitter for its conﬁguration.

Enable Loop Power on the 754

as required.

Press HART again and conﬁg-

ure the calibrator for the test;

select “Measure mA, Source

Dry-Well.”

Select “As-Found” to conﬁgure

for documenting the test. Be

sure to set the delay time long

enough to allow the dry-well

to change temperatures and

stabilize.

• Resistance Temperature

Detectors (RTDs) are almost

always more accurate than

thermocouples (TCs). As long

as the temperature measured

is within the range of the

RTDs, they are a better choice

when accuracy matters.

• Thermocouples have a wider

temperature range and are

more durable than RTDs.

• Thermocouples are a good

choice for applications with

rough service that experience

destructive vibrations and

repeated temperature cycling.

• Above ambient, dry-well cali-

brators stabilize at tempera-

ture faster with increasing

temperatures than decreasing

temperatures.

• If the stabilization time for

the dry-well is difﬁcult to

estimate, consider selecting

“Manual Test” on the 754 and

wait for the temperature to

stabilize before recording the

measurement.

• HART smart transmitters with

RTD probe inputs may allow

for entry of the probe’s certiﬁ-

cation constants. By inputting

these constants, the sensor

is matched and measurement

system errors are minimized.

To use a dry-well calibrator with a Fluke 754 to automatically test a transmitter

with sensor:

STEP

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STEP

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STEP

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STEP

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STEP

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STEP

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STEP

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STEP

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STEP

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STEP

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To perform the test:

Additional resources

For more in depth information about

this application check out these videos

and application notes from Fluke.

Testing, troubleshooting, calibrating process temperature

devices webinar

Selecting a Dry-Well Temperature Calibrator

Temperature calibration application note

Eliminating sensor errors in loop calibrations

TECH

TIPS

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