5608, 5609 Secondary Reference PRTs with Calibration Options

Fluke 5608 & 509 Secondary PRT with Calibration Options

Key features
• –200 °C to 500 °C (80 mm minimum immersion)
• ± 0.01 short-term stability
• Calibration not included, NVLAP-accredited calibration optional, lab code 200348-0
• Dry-well reference with 90 ° bend
• One year (limited) warranty

The 5608 comes with a one-eighth inch (3.18 mm) diameter sheath in lengths of 9 inches or 12 inches.

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 an 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 a 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.

Specifications
Temperature range: –200 °C to 500 °C
Nominal resistance at 0.01 °C: 100 Ω ± 0.5 Ω
Temperature coefficient 0.0039250 Ω/Ω/°C

Accuracy [1]: See footnote
Short-term repeatability[2]:
± 0.01 °C at 0.010 °C
± 0.02 °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: 500 MΩ at 23 °C, 20 MΩ at 500 °C
Transition junction dimensions: 71 mm x 12.5 mm (2.8 in x 0.49 in)
Minimum immersion length[4] (<5 mK error): 80 mm (3.1 in)
Maximum immersion length: 305 mm (12 in) Response time[5]: 9 seconds typical
Self heating (in 0 °C bath): 75 mW/°C
Lead-wire cable type: Teflon,™ 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.