Fluke Calibration 1523, 1524, 1502A, 1504, 1529 Data Sheet
...
Industrial temperature
readout and probe
selection guide
Industrial temperature sensors are typically calibrated by placing them
in a stable temperature source (dry-well, furnace, calibration bath) and
comparing their output to a reference standard probe connected to a
thermometer readout. This document provides a guide for selecting a
thermometer readout and companion reference standard probe that
will provide adequate system accuracy required to calibrate common
temperature sensors such as PRTs and thermocouples.
1502A
This guide covers the most common applications of precision
thermometers in calibration such as choosing a thermometer to improve
calibration accuracy in a bath or dry-well or to compare against process
instrumentation in-situ (e.g. a thermowell next to a gauge or transmitter).
Please consult a Fluke Calibration temperature specialist to assist with
your equipment selection if you have a special application such as
measuring surface temperatures, liquids with high pH, air temperature, or
temperature inside an enclosure such as a freezer or oven.
150 4
1523
1529
1524
Five steps in choosing a thermometer readout
and reference probe:
step
Choose the best thermometer readout
1
step
2
step
3
step
4
for the industrial sensor application.
Select the reference probe considering
the temperature range of the sensor
application and immersion depth required.
Determine the combined system
accuracy of the readout and reference
probe selected.
Verify that the readout and probe system
selected will provide the accuracy needed
to calibrate the sensor under test.
1586A
step
Evaluate if additional calibration is required.
5
Step 1. Choose the best thermometer readout
for the industrial application.
Several questions should be considered in selecting the right thermometer readout:
• Which temperature sensors need to be calibrated—PRTs/RTDs, thermistors, thermocouples?
• Will the readout be used in the field or in a calibration lab?
• How many channels are needed on the readout?
• What level of data logging, graphing and recording features are required?
• Is temperature source control of dry-wells, baths, or furnaces desired to help automate sensor calibration?
The following table provides a guide for selecting a readout with these technical needs in mind.
Technical needs 1523 1524 1502A 1504 1529 1586A
Measure PRTs / RTDs
Measure thermistors
Measure thermocouples
Battery powered
Handheld design
Single channel
Multi channel (maximum channels) 2 4 40
Record data (maximum readings) 25 15,000 8,000 75,000
Automated data logging
Graphing (maximum channels) 1 2 4 (in color)
Statistical functions (min, max, avg,
etc)
Temperature source control
(Fluke Calibration dry-wells,
baths, furnaces)
Table 1. Fluke Calibration thermometer readouts.
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Optional Optional Optional
•
2 Fluke Calibration Industrial temperature readout and probe selection guide
Step 2. Select the reference probe considering the temperature
range of the sensor application and immersion depth required.
It is important to select a reference probe that covers the full temperature range of the sensor application.
Table 2 summarizes temperature ranges for selected reference probes.
Model Probe Range
Secondary Reference PRT
1
5615-6 –200 °C to 300 °C –50 °C to 200 °C 152 mm x 4.76 mm
5615-9 –200 °C to 420 °C –50 °C to 200 °C 229 mm x 4.76 mm
5615-12 –200 °C to 420 °C –50 °C to 200 °C 305 mm x 6.35 mm
Precision Industrial PRT
1
5627A-6 –200 °C to 300 °C 0 °C to 150 °C 152 mm x 4.7 mm
5627A-9 –200 °C to 300 °C 0 °C to 150 °C 229 mm x 4.7 mm
5627A-12 –200 °C to 420 °C 0 °C to 150 °C 305 mm x 6.35 mm
Secondary Standard PRT
1
5628 –200 °C to 661 °C 0 °C to 80 °C 305 or 381 mm x
Full Immersion PRT
2
5606 –200 °C to 160 °C –200 °C to 160 °C 50 mm x 3.1 mm
Transition
Junction Range Size Basic Accuracy
± 0.013 °C at 0.010 °C 100 mm (4.0 in)
(6.0 in x 0.188 in)
± 0.013 °C at 0.010 °C 100 mm (4.0 in)
(9.0 in x 0.188 in)
± 0.013 °C at 0.010 °C 127 mm (5.0 in)
(12.0 in x 0.250 in)
± 0.05 °C at 0 °C 100 mm (4.0 in)
(6.0 in x 0.187 in)
± 0.05 °C at 0 °C 100 mm (4.0 in)
(9.0 in x 0.187 in)
± 0.05 °C at 0 °C 127 mm (5.0 in)
(12.0 in x 0.250 in)
± 0.006 °C at 0 °C 127 mm (5.0 in)
6.35 mm (12.0 or
15.0 in x 0.250 in)
± 0.05 °C 76 mm (3.0 in)
(2.0 in x 0.125 in)
Minimum
4
Immersion
Depth
Thermistor Secondary Probe
3
5610 0 °C to 100 °C 0 °C to 100 °C 152 or 229 mm x
3.2 mm (6.0 or 9.0 in
x 0.125 in)
1
17025 accredited calibration included.
2
No calibration included. Check with your distributor for calibration options.
3
NIST traceable calibration included. NV LAP accredited calibration optional.
4
“Basic Accuracy” includes cal ibration uncertainty and short-term repeatabi lity. It does not include long-term drift.
Table 2: Temperature ranges for select Fluke Calibration probes.
3 Fluke Calibration Industrial temperature readout and probe selection guide
± 0.01 °C 76 mm (3.0 in)
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