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Watlow Style MC Microcoil Thermocouple
Accurate, Repeatable, Fast Response in Perpendicular Surface Measurement
Watlow's new MICROCOIL miniature thermocouple provides surface temperature measurements with an unparalleled degree of accuracy. This patent pending technology achieves critical isothermal surface temperature measurement and offers superior design flexibility.

Typical sensor to sensor repeatability of one to two percent (ΔT) can be achieved with the MICROCOIL because the areas of the sensor that are vulnerable to normal production variances are not in the thermal gradient. Weld location, insulation theckness and welded tip thickness no longer impact measurement in an isothermal environment. Therefore, the inherent disadvantages of measuring surface temperatures are no longer a problem with the MICROCOIL.

The MICROCOIL thermocouple utilizes Watlow's XACTPAK mineral insulated thermocouple cable, which with an ungrounded junction will electrically isolate the circuit from the surface being measured. For higher voltage applications, ceramic sensor discs can be used for additional protection.

The MICROCOIL thermocouple is designed for demanding applications including chambers, wafer supports, heat sinks, chip cases, platens, packaging, cleaning and food preparation. It measures maximum continuous temperatures up to 1292°F (700°C).

Depending on application requirements for temperature and material compatibility, the MICROCOIL thermocouple can emply a wide range of sensor disc materials. Metals and ceramics can be used to customize response time, accuracy, contamination levels and electrical isolation.

The helix design of the MICROCOIL demonstrates a faster response time because the surface temperature needs to conduct only through the diameter of the cable and the thickness of the sensor disk.

The thermal analysis to the right demonstrates the superior performance of the MICROCOIL technology. This patent pending method achieves the critical isothermal area for a long length of the very small cable, therefore insuring accurate and repeatable measurement.


Download Watlow Style MC Microcoil Thermocouple Brochure (pdf)
Features & Benefits:

Miniature Size:

  • Footprint can be as small as 0.110 inch diameter
  • Allows for precision measurement in tight spaces
  • Single, isolated, ungrounded junctions in XACTPAK as small as 0.010 inch diameter
XACTPAK mineral insulated thermocouple cable:
  • Electronically isolated and shielded

1292°F (700°C) maximum continuous temperature:

  • Offers exact measurement for demanding applications

Self leveling and loading:

  • Provides superior repeatability of measurement for a wide variety of surfaces
Custom Ordering Information -
Watlow Microcoil Style Thermocouples
M C ____ ____ ____ ____ ____ ____ ____ ____ ____ ____
1 2 3 4 5 6 7 8 9 10 11 12
To order, make a selection in each category below, enter the quantity needed,
then click the "submit" button at the bottom of the page.
The part number and price will be displayed on the next page.
NOTE: Prices shown are for orders of 5 pieces or more.
There is a higher price for low quantity orders which is shown on next page.
1-2 Construction Style
MC = Type K Calibration, 0.020 in. (0.51 mm) diameter Alloy 718 thermocouple sheath, 0.125 in. (3.18 mm) coil diameter, 12.5 oz (355 g) approx. spring force for 0.050 in. (1.27 mm) compression

3. Temperature Rating
C = Copper tip 662°F (350°C) max
N = Aluminum nitride 1292°F (700°C) max

4. Junction Type
G = Grounded single junction
U = Ungrounded single junction

5-6. Sheath Length "S"
XX = 02 to 18 in. Inches

7. Hot Leg Length "H", if 90 degree bend (in.)
0 = n/a, straight sheath
A = 1.125
D = 1.500
H = 2.000
M = 2.500
S = 3.000
Notes: Bend radius is 0.25 in., Cold leg length (1.0 in. min.) = S - H - 0.4 in., If a fitting is ordered, it will be installed hand tightened onto the hot leg and the minimum hot leg length "H" is 2.500 in.

8. Fitting, Optional
0 = None
C = Compression fitting, adjustable, 1/8 in. NPT, TFE gland

9. Lead Length Construction, Solid Conductors
1 = 24 ga., Fiberglass
2 = 26 ga., FEP with shield and drain not attached
5 = 24 ga.,FEP with stainless steel overbraid

10-11. Lead Length "L"
XX = 03 to 99 in. Inches

12. Lead Wire Terminations
A = Standard male plug
B = Standard female jack
C = Standard plug with mating connector
F = Miniature male plug
G = Miniature female jack
H = Miniature plug with mating connector
T = Standard, 1-1/2 in. (38.10 mm) split leads
U = 1-1/2 in. (38.10 mm) split leads with spade lugs

ENTER QUANTITY
(Higher price applies for quantities less than 5 pieces)


Watlow Thermocouple Termination Options
A = 2-1/2" Split Leads B = Spade Lugs D = Standard Plug-Male E = Standard Plug-Female
C = BX Connector with
Space Lugs		 H = 1/4" Push On
Female Quick Disconnect		 F = Miniature Plug-Male G = Miniature Plug-Female
This page last modified on 1/17/2023
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