The PR-18 series has been updated with low, high, and extreme temperature ranges; all of the new models will be PR-18(L,H,E)*. The older models have been discontinued.
Omega's PR-18 series probe with standard aluminum protection head with flip-top includes PT100 Ω platinum RTD element or PT1000 RTD element and 1/2" NPT mounting threads. The sheath is made of 316 stainless steel. These probes can be used alone, or can be placed directly into a thermowell. The spring load option should not be ordered unless a thermowell is used. All probes include a screw terminal block for easy connection of insulated copper extension wire. Replacement probes (without protection head assembly) are available as well as a "spring-loading" option which allows for the probe to bottom out in a thermowell for quicker and more accurate response. This probe can be used in tanks, vessels, and large pipes for measurement of flow material.
RANGE : L : LOW (-50 to 250°C) H : HIGH (-50 to 450°C) E : EXTREME (-200 to 600°C)