5608, 5609 Secondary Reference PRTs with Calibration Options

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Product Description

The 5608 comes with a one-eighth inch (3.18 mm) diameter sheath in lengths of 9 inches or 12 inches. The 5609 comes with a one-quarter inch (6.35 mm) diameter sheath in lengths of 12 inches, 15 inches, and 20 inches; or with a 6 mm diameter in lengths of 300 mm, 400 mm, or 500 mm.

When looking for improved response time and reduced stem effect in shallow immersion, look for small diameter probes, because the measurement error called stem effect is caused by the diameter of the stem rather than the length of the stem.

Both of these probes have Inconel™ sheaths and are made using a special manufacturing process, giving them great precision over a wide temperature range. The sensors for these probes are reference-grade platinum and feature four-wire connections with less noisy measurements than two-wire counterparts.

As standard, each probe includes its resistance value at the triple point of water. If calibration is desired, you can order a NVLAP-accredited calibration from our laboratory; lab code 200348-0. On the report of calibration, you’ll get the test data and the ITS90 calibration coefficients that you can easily input into any Fluke Calibration thermometer. If you order your probe with an smart connector, we’ll program the coefficients directly into your connector, which loads the coefficients for you when you plug it into our 1524 Handheld Thermometer.

The 5608 comes with a one-eighth inch (3.18 mm) diameter sheath in lengths of 9 inches or 12 inches. The 5609 comes with a one-quarter inch (6.35 mm) diameter sheath in lengths of 12 inches, 15 inches, and 20 inches; or with a 6 mm diameter in lengths of 300 mm, 400 mm, or 500 mm.

When looking for improved response time and reduced stem effect in shallow immersion, look for small diameter probes, because the measurement error called stem effect is caused by the diameter of the stem rather than the length of the stem.

Both of these probes have Inconel™ sheaths and are made using a special manufacturing process, giving them great precision over a wide temperature range. The sensors for these probes are reference-grade platinum and feature four-wire connections with less noisy measurements than two-wire counterparts.

As standard, each probe includes its resistance value at the triple point of water. If calibration is desired, you can order a NVLAP-accredited calibration from our laboratory; lab code 200348-0. On the report of calibration, you’ll get the test data and the ITS90 calibration coefficients that you can easily input into any Fluke Calibration thermometer. If you order your probe with an smart connector, we’ll program the coefficients directly into your connector, which loads the coefficients for you when you plug it into our 1524 Handheld Thermometer.

Highlights

Very stable thermometer from –200 °C to 670 °C

  • 5608: –200 °C to 500 °C (80 mm minimum immersion)
  • 5609: –200 °C to 670 °C (100 mm minimum immersion)
  • Calibration not included, NVLAP-accredited calibration optional, lab code 200348-0
  • Dry-well reference with 90 ° bend

If you want a very stable thermometer from –200 °C to 670 °C and are particular about the calibration, then look no further than our 5609 Secondary Reference PRT. Its short-term stability at the triple point of water is only ± 7 mK and its one-quarter inch (6.23mm) diameter lets you get accurate measurements in only 100 mm of immersion.

The 5608 is also a ± 7 mK probe at the triple point of water, but its one-eighth inch (3.18 mm) diameter gets you accurate measurements from –200 °C to 500 °C with only 80mm (3.1 in) of immersion. With multiple sheath length options on both of these probes, you can find the dimensions that are just right for your specific application.

Specifications

Specifications

Temperature range
5608  : –200 °C to 500 °C
5609  : –200 °C to 670 °C
Nominal resistance at 0.01 °C 100 Ω ± 0.5 Ω
Temperature coefficient 0.0039250 Ω/Ω/°C
Relative Accuracy[1]
 
 
 
± 0.007 °C at –200 °C
± 0.008 °C at 0 °C
± 0.020 °C at 420 °C
± 0.027 °C at 660 °C
Short-term repeatability[2]
 
± 0.007 °C at 0.010 °C
± 0.013 °C at max temp
Drift[3]
 
± 0.01 °C at 0.010 °C
± 0.02 °C at max temp
Hysteresis ± 0.01 °C maximum
Sensor length 30 mm ± 5 mm (1.2 in ± 0.2 in)
Sensor location 3 mm ± 1 mm from tip (0.1 in ± 0.1 in)
Sheath material Inconel™ 600
Minimum insulation resistance
 
5608  : 500 MΩ at 23 °C, 20 MΩ at 500 °C
5609  : 500 MΩ at 23 °C, 10 MΩ at 670 °C
Transition junction temperature range[4] –50 ºC to 200 °C
 
Transition junction dimensions 71 mm x 12.5 mm (2.8 in x 0.49 in)
Minimum immersion length[5]
(<5 mK error)
5608  : 80 mm (3.1 in)
5609  : 100 mm (3.9 in)
Maximum immersion length 305 mm (12 in)
Response time[5]
 
5608  : 9 seconds typical
5609  : 12 seconds typical
Self heating (in 0 °C bath)
 
5608  : 75 mW/°C
5609  : 50 mW/°C
Lead-wire cable type PTFE 24 AWG
Lead-wire length 1.8 m (6 ft)
Lead-wire temperature range –50 °C to 250 °C
Calibration Calibration not included; NVLAP-accredited calibration optional, lab code 200348-0. Please see calibration uncertainty table and its explanation of changeable uncertainties.

Calibration Uncertainty for optional NVLAP-accredited† calibration

Temperature Expanded Uncertainty (k=2)
–197 °C 0.025 °C
–80 °C 0.025 °C
–38 °C 0.025 °C
0.01 °C 0.025 °C
156 °C 0.030 °C
231 °C 0.030 °C
419 °C 0.035 °C
660 °C 0.050 °C
Note  : Calibration uncertainties depend on the uncertainties of the lab performing the calibration. Subsequent calibrations of this probe performed with different processes, at different facilities, or with changed uncertainty statements may state different uncertainties. †Lab code 200348-0

[1]  Includes short-term repeatability and 100 hr drift. Calibration will add additional uncertainties.
[2]  Three thermal cycles from min to max temp, includes hysteresis, 95 % confidence (k=2)
[3]  After 100 hours at max temp, 95 % confidence (k=2)
[4]  Temperatures outside this range will cause irreparable damage. For best performance, transition junction should not be too hot to touch.
[5]  Per ASTM E 644

Models and Accessories

Model Name Description
5608-9-X Secondary Reference PRT, 9 in x 1/8 in, –200 to 500 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5608-12-X Secondary Reference PRT, 12 in x 1/8 in, –200 to 500 °C,  lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-12-X Secondary Reference PRT, 12 in x 1/4 in, –200 to 670 °C,  lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-20-X Secondary Reference PRT, 20 in x 1/4 in, –200 to 670 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-300-X Secondary Reference PRT, 300 mm x 6 mm, –200 to 670 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-400-X Secondary Reference PRT, 400 mm x 6 mm, –200 to 670 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-500-X Secondary Reference PRT, 500 mm x 6 mm, –200 to 670 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).
5609-9BND Secondary Reference PRT, 15 in x 1/4 in, 9 in bend, –200 °C to 670 °C, lead wire (cable) 6 ft
(No calibration included. See recommended calibration options below. Contact your Fluke Calibration representative for additional calibration options.)
X = termination. Specify “A” (INFO-CON for 914X), “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), “P” (INFO-CON for 1523 or 1524), or “S” (spade lugs).

Accessories common to all models  :

Accessory Description
2601 Probe Carrying Case, Plastic (for probes up to 228 mm [9 in] in length)
2609 Probe Carrying Case, Plastic (for probes 635 mm [25 in] in length)
1922-4-R PRT Calibration for 5608 and 5609 PRTs, -200 °C to 500 °C, NVLAP Accredited 
1923-4-7 PRT Calibration for 5609 PRTs, -200 °C to 660 °C, NVLAP Accredited
1930-4-R System Calibration by Comparison for 5608 and 5609 PRTs, -200 °C to 500 °C, NVLAP Accredited (probe and thermometer readout combined as a system)
1930-4-7 System Calibration by Comparison for 5609 PRTs, -200 °C to 660 °C, NVLAP Accredited (probe and thermometer readout combined as a system) 

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