Secondary Standard PRT Temperature Sensors- Models
5626 and 5628
Features |
Range to 660°C |
Meets all ITS-90 requirements for resistance ratios |
Rtp drift < 20mK after 500 hours at 660°C |
Strain-free sensor design by Hart’s SPRT
engineers |
Specifications |
Temperature Range |
–200°C to 660°C |
Maximum Handle Temp. |
80°C |
Rtp |
5626: 100 ±1 ohm
5628: 25.5 ±0.5 ohm |
W(Ga) |
³1.11807 |
Calibration Uncertainty |
±0.01°C @ 660°C |
Stability |
5626: ±0.003°C
5628: ±0.002°C |
Long-Term Drift |
5626: £0.03°C/500 hours at 660°C
5628: £0.02°C/500 hours at 660°C |
Sheath |
Inconel™ 600 |
Lead Wires |
4-wire Teflon™-insulated silver-plated stranded
copper, 22 AGW |
Termination |
Gold-plated spade lugs |
Size |
0.25" dia. x 12" and 15"L standard, custom
lengths available |
Hart’s new high-temp secondary standards fill the gap between
affordable but temperature-limited secondary PRTs and more expensive, highly accurate
SPRTs.
If you’re using block calibrators, furnaces, or temperature points
above normal secondary RTD temperatures (420°C), then these two PRTs are for you. The
5626 is nominally 100W and the 5628 is nominally 25.5W. Both instruments have a temperature range of –200°C to
660°C. They make great working or check standards for calibration work up to the aluminum
point.
Using a regular PRT at temperatures above 500°C exposes the platinum to
contamination. If the PRT is used as a reference or calibration standard, contamination is
a major problem. SPRTs, which are more expensive and delicate, can handle the higher
temperatures, but with greater risk to the instrument due to shock, contamination, or
mishandling. The 5626 and 5628 are designed to reduce the contamination risk through the
use of internal protection while not impairing performance.
In addition to the right measurement performance and durability, a PRT for
secondary applications should be priced affordably. Hart’s new PRTs are inexpensive
and come with a calibration included. The calibration comes complete with ITS-90 constants
and a resistance vs. temperature table.
Check the temperature range, check the stability, check the price! Who
else gives you this much quality, performance, and value for your money? No one!
Click here to view
(in PDF format) a technical paper presented at NCSL 2000 on the Models 5626 and 5628 PRTs.
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