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 ± 10 mK and its one-quarter inch (6.23 mm) diameter lets you get accurate measurements in only 100 mm of immersion. The 5608 is also a ± 10 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 80 mm (3.1 in) of immersion. With multiple sheath length options on both of these probes, and an optonal 90 ° bend at nine inches from the tip for dry-well applications, you can find the dimensions that are just right for your specific application.
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.
These probes come with a certificate of compliance to ensure they meet their specifications. If you’d like, you can also 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 ITS-90 calibration coefficients that you can easily input into any Hart thermometer. If you order your probe with an INFO-CON connector, we’ll program the coefficients directly into your connector, which loads the coefficients for you when you plug it into our 1522 Handheld Thermometer.
Call today for your free quote.
5608: –200 °C to 500 °C
Nominal resistance at 0.01 °C
100 W ± 0.5 W
± 0.01 °C at 0.010 °C
± 0.01 °C at 0.010 °C
± 0.01 °C maximum
30 mm ± 5 mm (1.2 in ± 0.2 in)
3 mm ± 1 mm from tip (0.1 in ± 0.1 in)
Minimum insulation resistance
5608: 500 MW at 23 °C, 20 MW at 500 °C
71 mm x 12.5 mm (2.8 in x 0.49 in)
Minimum immersion length (<5 mK error)
5608: 80 mm (3.1 in)
Maximum immersion length
305 mm (12 in)
5608: 9 seconds typical
Self heating (in 0 °C bath)
5608: 75 mW/°C
Lead-wire cable type
Teflon,™ 24 AWG
1.8 m (6 ft)
Lead-wire temperature range
–50 °C to 250 °C
Calibration not included; NVLAP-accredited calibration optional, lab code 200348-0. Please see calibration uncertainty table and its explanation of changeable uncertainties.
“Accuracy” is a difficult term when used to describe a
Three thermal cycles from min to max temp, includes hysteresis, 99.9 % confidence
After 100 hours at max temp, 99.9 % confidence
Per ASTM E 644
Secondary Reference PRT, 9 in x 1/8 in, –200 to 500 °C
Secondary Reference PRT, 12 in x 1/8 in, –200 to 500 °C
Secondary Reference PRT, 12 in x 1/4 in, –200 to 670 °C
Secondary Reference PRT, 15 in x 1/4 in, –200 to 670 °C
Secondary Reference PRT, 20 in x 1/4 in, –200 to 670 °C
Secondary Reference PRT, 300 mm x 6 mm, –200 to 670 °C
Secondary Reference PRT, 400 mm x 6 mm, –200 to 670 °C
Secondary Reference PRT, 500 mm x 6 mm, –200 to 670 °C
Secondary Reference PRT, 15 in x 1/4 in, 9 in bend,
PRT Calibration, –200 °C to 500 °C, NVLAP Accredited
PRT Calibration, –200 °C to 660 °C, NVLAP Accredited
PRT Calibration, –200 °C to 660 °C, NIST-traceable
Precision Digital Thermometer System Calibration by Comparison, NVLAP-accredited, lab code 200348-0
Plastic PRT Case, for models ending -9, -12, and -300
Plastic PRT Case, for models ending -15, -20, -400, and -500
X = termination. Specify “B” (bare wire), “D” (5-pin DIN for Tweener Thermometers), “G” (gold pins), “I” (INFO-CON for 1521 or 1522 Handheld Thermometers), “J” (banana plugs), “L” (mini spade lugs), “M” (mini banana plugs), or “S” (spade lugs).
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