Replacement RTDprobes are available in two configurations, either
fixed length for direct immersion or spring loaded for use with thermowells
(allows for good contact with bottom of thermowell). Each probe features
#26 AWG stranded nickel plated copper, PFA insulated wires (2 red, 1 white) 6" long standard.
These probe assemblies can be used as replacement sensors for our PRTF-12, -14 and -18
RTD sensor assemblies, used as is, or combined with our optional thermowells and connection heads
to design your own sensor configration.
Fixed Length Probes:
When ordering fixed length replacement probes, the length of the probe is specified from the tip of the probe to the full engagement point of the 1/2NPT thread
(which is typically 1/2" as shown). Note: If being used in a thermowell, typically spring loaded probes are recommended. Otherwise, the thread engagement
must be taken into account to insure that the sensor is not damaged by contacting the bottom of the thermowell bore during installation.
Fixed Length Probes
Spring Loaded Probes:
When ordering spring loaded replacement probes, the length of the probe should be specified as the immersion length of the thermowell it will be placed into.
The immersion length is the distance from the top of the thermowell to the bottom of the bore.
Spring Loaded probes are used to insure that the probe bottoms in the thermowell, and that a small amount of force is present to insure that this contact is
maintained when exposed to process conditions. The actual probe length of the sensor before insertion is a little longer than the immersion length as shown
below to allow for a 1/4" spring compression when the sensor is threaded into the thermowell.
Spring Loaded Probes
† All dollar amounts on this site are shown in US currency.
Note:
For 2-wire construction, change “-2” in model number to “-1”, for 4-wire construction, change to “-3” (color code is red/white, red/red/white or red/red/white/white) and add $5 to the price.
For special probe lengths, change sheath length in model number to required sheath length in inches, add $1 per inch to the price above 24".
For lead wires other than 6" long, add lead wire length in inches after the “-SL” in the model number and $2.25 per foot to the price.
For fiberglass insulated lead wires, add “-GG” to the model number and $6 to the price.
Ordering Example: (1) PRTF-12-2-100-1/4-6-E-RP-SL spring loaded 1/4" OD by 6" long probe with 1/2 x 1/2 NPT mounting threads, 100 ohm Pt100 Class B element and three 6" long PFA insulated extension wires, $70.00
