See our New Higher Temperature, Bendable RTD Sensors at PR-26
Note: These Sensors Require an M12 Extension Cable to Connect the Sensor To Your
Instrumentation. A Partial List Of Our M12 Extension Cables is Included in the Ordering Table Below.
Our RTD sensors with M12 connections provide for easy and efficient installation or removal of these sensors for periodic calibration, troubleshooting or replacement. Gone
are the days of having to pull extension cables from cable trays in order to calibrate or replace the sensor, now you simply disconnect the sensor from the extension cable
saving cost and downtime. The Omega PR-21 RTD is a flexible and robust temperature sensor constructed with 316L Stainless Steel housings and sheaths for strength and corrosion
resistance. These sensors include a 4-pin, M12 A-Coded plug connector for easy assembly to patch cables or extension cables, as well as a variety of "NPT" pipe thread and
metric mounting thread options for easy installation into a wide variety of threaded ports. A non-threaded housing option is also available for other types of installations.
For use in thermowells, the PR-21SL Spring-Loaded version of this sensor is the preferred solution. The PR-21SL design includes a non-threaded PR-21A style probe with
a self-gripping spring and 1/2NPT threaded fitting to insure that the probe will contact the bottom of the thermowell bore without damaging the sensor. This insures that the sensor
length will always be a perfect fit for your thermowell. See the PR-21SL page for additional information.
The mounting thread options on the PR-21 Series sensors allow them to be used in a wide variety of applications, including:
Stand alone immersion sensors.
Installed directly into your product or process using an existing NPT or metric threaded port.
When combined with our M12-Handle, non-threaded "A" style PR-21 probes can be used in hand-held sensing applications.
Other applications using a variety of available compression fittings or other accessories.
These RTD sensors can be used in any 2, 3 or 4-wire application by selecting one of the two available wiring
arrangements (see the wiring diagrams below) and using only those wires needed for your measurement connection. This allows for
simplified, trouble free installation with any existing application. This also allows the PR-21 series sensor to be used
for a wide variety of replacement applications since it can be connected as-is with just about any measurement or
control equipment available when combined with a 4-pin female M12 connector extension or patch cable.
When ordering your PR-21 sensor, don't forget your extension cable. Omega offers a wide selection of extension cables including over molded PVC, Polyurethane and Silicone cables, as well as customized cables in a variety of materials with optional stainless steel braid or hose for improved mechanical protection, and a wide selection of instrument connections.
Connect your PR-21 RTD sensor to one or more of Omega's wide variety of in-stock controllers, data loggers, transmitters, hand held thermometers, PLCs, or other measurement & control products to complete your measurement or control system. Omega offers a selection of programmable and fixed range transmitters that can be connected directly to the M12 connection of your PR-21 sensor. There are also wireless transmitter options available.
Metal Parts: 316L Stainless Steel Sheath and Housing.
Connector: 4-Pin "A"-Coded M12 Plug Connector
Standard Mounting Threads: 1/2NPT, 3/8NPT, 1/4NPT, M10x1mm, M8x1mm, G1/4 BSPP, G1/2 BSPP and Non-Threaded
Standard Probe Diameters: 1/4", 1/8", 6mm and 3mm
Standard Probe Lengths: 6" for 1/4" & 1/8" Diameters, 160, 260 & 360mm for 6mm and 3mm Diameters
Sensor: Pt100 (100 Ohms at 0°C, .00385 TCR (alpha)) Standard, Pt1000 and Other Options Available
Accuracy: Class A Standard (per IEC 60751), Others Available Upon Request
Temperature Range: -50 to 250°C Except for the Connector Which is 85°C Max
Insulation Resistance: 100 Megohms Minimum at 100VDC at Room Ambient
Response Time: 3 Seconds Max (63.2% Response) When Immersed in Water Flowing at 3 feet/sec
Vibration Resistance: 10g's from 10 to 500Hz per MIL-STD-202G, Method 204D, Test Condition A (6" long or shorter)
† All amounts shown in USD Note:
For 1000 ohm elements, change "100" in model number to "1000" at no additional charge.
For lengths longer than 6" or 360mm, change length of probe in model number to length required (examples: for 9.5" enter 0950, for 175mm enter "0175") and add $1 per inch or 25mm to the price.
For 3mm diameter probe, change "M6" to "M3" in the model number, for 1/8" diameter change "1/4" to "1/8" in the model number at no additional charge.
For use in thermowells, please see the PR-21SL page for the spring loaded version of this product.
Ordering Example: (1) PR-21A-3-100-A-1/4-0600-M12-1 100 Ohm, Class A RTD with 1/4" diameter by 6" long probe, no mounting thread and M12 connector, $66.00 plus (1) PR-21F-3-100-A-M6-0160-M12-1 100 Ohm, Class A RTD with 6mm diameter by 160mm long probe, M10x1 mounting thread and M12 connector, $77.00, $66.00 + 77.00 = $143.00
Part Number Builder
Build Your Part Number Below
Mounting Thread select from: A for Non Threaded Housing B for 1/2NPT C for 3/8NPT D for 1/4NPT E for M8x1 F for M10x1 G for G1/2 BSPP H for G1/4 BSPP
Element Specification select from: 100-A for Pt100 Class A 1000-A for Pt1000 Class A
Probe Diameter select from: 1/4 for 1/4 inch Probe Diameter (Fractional) 1/8 for 1/8 inch Probe Diameter (Fractional) M6 for 6mm Probe Diameter (Metric) M3 for 3mm Probe Diameter (Metric)
Probe Length select from: 0600 for 6 inch Probe Length (Fractional Standard) 0160 for 160mm Probe Length (Metric Standard) 0260 for 260mm Probe Length (Metric Standard) 0360 for 360mm Probe Length (Metric Standard)
Wiring Arrangement as Shown select from: 1 for Option 1 Per Diagram 2 for Option 2 Per Diagram
Note: All combinations may not be valid, check spec sheet for valid part numbers.