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Mineral Insulated Metal Sheath Thermocouple Probes with Bare Leads


Item# BLMI-304-K-116U-120

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 C$108.40
10-24 C$102.98
25-99 C$97.56
100-499 C$92.14
500-999 C$86.72
1000+ C$81.30

In stock

Lead Time (If not in stock): 4 weeks
Mineral Insulated Metal Sheath Thermocouple Probes with Bare Leads BLMI-304-K-116U-120 BLMI-304-K-116U-120

BLMI-304-K-116U-120 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
Junction Type
Probe Diameter
Probe Length
Cable Length
Termination Connection Type
Additional Feature
Process Temperature Unit
Process Temperature Min
Sensor Application

BLMI Replacement Thermocouple Probes Deliver Consistent, Superior Quality Through Automated Manufacturing

Bare lead mineral insulated BLMI replacement TC probes begin with OMEGA’s own high-purity magnesium oxide SLE grade thermocouple cable. BLMI TC sensors are built and quality tested on our automated manufacturing cells.

OMEGACLAD™ mineral insulated MI thermocouple material is metal sheathed thermocouple cable that is cut, stripped, beaded, closed, potted, and tested by equipment designed and built in-house exclusively for these tasks. Replacement TC probes are available in 6 inch (150 mm), 12 inch (300 mm), and 18 inch (450 mm) lengths. The cold end bare leads are 1.0 in. (25 mm) in length.The hot end junction can be selected as grounded, ungrounded or exposed. Contact sales for custom lengths or diameters. Connectors, accessories and other related options are listed below.

OEM quantity thermocouple sensor components can be shipped bulk as coiled or straight cut to length CTL with cold end stripped leads and hot junctions to match your tc probe specifications.

High Temperature Option
BLMI probes are also available in a high-temperature version. The cold end is potted using a ceramic cement rated to 1200°C (2200°F). Add “-CC” to the end of the probe part number and $5 to list price. (The actual temperature rating of the probe is dependent upon the calibration, sheath material, and probe diameter.)

“DUAL”Construction Option
Also available in a 4-wire construction (2 thermocouple junctions). Add “–DUAL” to the end of the part number and consult sales for pricing.

View the Thermocouple Accuracy and Color Code charts
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Rated 5 out of 5 by from Testing a new thermocouple for my process furnace Testing out a new thermocouple for my process furnace
Date published: 2023-02-15
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What is the normal operating condition like Temperature, Relative humidity, Vibration & Jerk that BLMI-304-J-116U-18 can experience?

Asked by: Santhosh
Thank you for your inquiry. For Temperature: 0 to 440°C. Relative Humidity: 0-100%. There is no vibration or 'jerk' data.
Answered by: Application Engineer CB
Date published: 2022-12-29

Can the probe be bent? If so can it be bent 90 degrees?

Asked by: cgarai
Yes, this whole series of probe can be bent. They are made of annealed metals, whether stainless steel or inconel, and can be bent with no damage to the probe. The bend radius is 2.5 times the diameter of the sheath, so a 90 degree bend is no problem at all.
Answered by: dennis882
Date published: 2022-12-26

is there a polarity for small wires ?

Asked by: kevins
Thank you for your inquiry kevins. Yes, there is polarity for all thermocouple wires/probes. For a J type thermocouple, red wire is negative and white wire is positive.
Answered by: Application Engineer SP
Date published: 2022-09-09

What is the diameter/AWG of the iron & Constantan solid wire in this BLMI-304-J-116U-18 TC, also provide the diametric tolerance of the TC sheath??

Asked by: Santhosh
Thank you for your inquiry. The inner wire diameter for a 1/16" probe is 0.010". The tolerance for a 1/16" probe is ±0.001".
Answered by: Application Engineer CB
Date published: 2023-01-24
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