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Thermocouple Probes with Molded M12 Connector

Thermocouple Probes with Molded M12 Connectors


Item# M12MJSS-1/4-U-18

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $63.17
10-24 $60.01
25-49 $58.75
50-99 $56.22
100-199 $54.96
200+ $53.69

In stock

Lead Time (If not in stock): 8 weeks
Thermocouple Probes with Molded M12 Connectors M12MJSS-1/4-U-18 M12MJSS-1/4-U-18
  • Available in Type 'J' with 304 Stainless Steel Sheath or Type 'K' with Inconel 600 Sheath
  • Single Element Configuration Standard
  • Ungrounded Junction Standard, Optional Grounded Junction Available
  • Available in 1/8' & 1/4' Diameters in Various Lengths Molded in ANSI Color Codes

M12MJSS-1/4-U-18 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Thermocouple Type
Process Temperature Max
Process Temperature Range
Sheath Material
Probe Diameter
Probe Length
Process Temperature Unit
Process Temperature Min
Sensor Application
Junction Type
Termination Connection Type

  • Measurement Units °C
  • Measurement Type Liquid Measurement
These thermocouple probes provide a quick and convenient method for measuring temperature in your process. They can be used as-is, mounted into your process using one of Omega's line of Compression Fittings, or used in a thermowell by using one of our Spring Loaded Fittings.

The M12 Series thermocouple probes are available as Type K thermocouples with Inconel 600 sheaths, or as Type J thermocouples with 304 Stainless Steel sheaths. Standard probe sizes include 1/4" and 1/8" diameters with lengths of 6", 9", 12", 18" and 24", and metric sizes in 3mm and 6mm diameters with lengths of 250, 500, 750, 1000 and 1500mm. These thermocouple sensors can also be requested in other lengths as needed.
The connectors on these sensors are overmolded with the IEC standard color code on the metric sizes and the ANSI standard color code on the fractional sizes. The connector pinout is as shown in the accompanying figure.

To connect this sensor to your measurement or control instrument, we recommend using one of Omega's M12 Extension Cables (listed in the ordering table below). Besides these extension cables, Omega offers a selection of specially assembled extension cables in a variety of cable materials with optional stainless steel braid or hose for improved mechanical protection, and a wide selection of instrument connections.

  • Type J Thermocouples have a 304 SST sheath with a temperature range of -40 to 600°C, with the connector overmolded in black nylon.
  • Type K Thermocouples have an Inconel 600 sheath with a temperature range of -40 to 1150°C, with the connector overmolded in yellow nylon for fractional sizes and green nylon for metric sizes.
  • Note: Molded Connectors have a maximum temperature of 90°C
  • Thermocouple Output is per IEC 584-2, Class 2.
  • Fractional sizes are 1/4 and 1/8 inch diameters in lengths of 6, 9, 12, 18 and 24 inches.
  • Metric sizes are 6mm and 3mm diameters in lengths of 250, 500, 700, 1000 and 1500mm.
  • Insulation Resistance is 100 megohms minimum at 100 VDC for ungrounded sensors.
  • Minimum Bend Radius is three times the outer diameter of the sensor.

  • Connect your M12 thermocouple probe to one of Omega's wide variety on In-Stock controllers, data loggers, hand held thermometers, PLCs or other measurement & control products to complete your measurement or control system.

    View the Thermocouple Accuracy and Color Code charts
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    why are these only rated down to 0 C

    Asked by: mark3234324
    The probes will work at temperatures below 0C (32F). It is the accuracy for the probe is only stated from 0C (32F) and above.
    Answered by: Temperature
    Date published: 2019-12-19

    Is the probe bendable?

    Asked by: Solvus
    These Thermocouple probes are bendable using a twice the diameter as the bend radius.
    Answered by: ANB ENG
    Date published: 2020-06-10
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