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Watlow Style AF Metal Transition MI Thermocouple
Mineral Insulated - Dual Element - Metal Transition with Spring Strain Relief

The Watlow Style AF Mineral Insulated Thermocouple temperature sensor "metal transition" style come with a metal transition with spring strain relief and lead wires. Because it is constructed with XACTPAK mineral insulation, the thermocouple is protected from moisture, thermal shock, high temperatures and high pressure.

Dual Element style - allows you to run two instruments off the same element, reducing costs.

Achieving specified temperature levels is critical to industrial processes. It's imperative that temperature sensors are designed and manufactured to exacting specifications for accuracy and reliability. Watlow is committed to providing you with the most accurate, high-integrity temperature measurement products possible. Watlow offers the greatest breadth of contact temperature measurement sensors and related components. Whatever your temperature sensing needs, Watlow can provide the optimum configuration, with the accuracy you require.

Performance Capabilities:

  • Watlow MI thermocouples easily handle temperatures up to 1200°C (2200°F).
  • They meet or exceed initial calibration tolerances per ASTM E 230.
  • Diameters as small as 0.010 in (0.25mm)
  • Flexiblity of the XACTPAK material allows you to bend the thermocouple without risk of cracking

To order a Watlow Style AF Dual Element Thermocouple build the desired 15-digit model part number using the ordering information form below.

Download Watlow Style AF Thermocouple Catalog Page (pdf)
Custom Ordering Information -
Watlow Style AF Dual Element Thermocouples
A F ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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
AF = Mineral insulated metal transition thermocouple

3. Sheath Diameter (choose E, G, H or J)
Limited Availability - consult yellow chart below for availability with sheath material & calibration type.
E = 0.063 inch diamater
G = 0.125 inch diameter
H = 0.188 inch diameter
J = 0.250 inch diameter

4. Lead Wire Construction Type (choose A, B , C, D, J, K, L, M, R, S, T or U)
A = Solid glass
B = Stranded glass
C = Solid FEP
D = Stranded FEP
J = Solid glass with SS braid
K = Stranded glass with SS braid
L = Solid Teflon with SS Braid
M = Stranded Teflon with SS Braid
R = Solid glass with flex armor
S = Stranded glass with flex armor
T = Solid teflon with flex armor
U = Stranded teflon with flex armor

5. Fittings (choose one)- please note sheath size availability
0 = None
A = Fixed single thread 1/8 NPT 303SS - sheath sizes 0.063 to 0.250
B = Fixed single thread 1/4 NPT 303SS - sheath sizes 0.125 to 0.250
D = Fixed single thread 1/2 NPT 303SS - sheath sizes 0.125 to 0.250
F = Fixed double thread 1/2 NPT 303SS - sheath sizes 0.125 to 0.250
G = Adj. compression TFE Gland 1/8 NPT 303SS - sheath sizes 0.063 to 0.188
H = Adj. spring loaded double threaded 1/2NPT 316SS - sheath size 0.250
J = Non-adjustable compression 1/8 NPT brass - sheath sizes 0.125 to 0.250
L = Non-adjustable compression 1/8 NPT 303SS - sheath sizes 0.063 to 0.250
Q = Adj. compression Lava Gland 1/8 NPT 303SS - sheath sizes 0.063 to 0.188
V = Adjustable compression Lava Gland 1/4 NPT 303SS - sheath size 0.250
W = Bayonet lockcap and spring - plated steel - sheath sizes 0.125 to 0.188
X = Adjustable compression TFE Gland 1/4 NPT 303SS - sheath size 0.250
2 = Flat weld pad - 304SS - all sheath sizes
5 = Milled slot weld pad - 304SS - all sheath sizes

6. Lead Wire Termination (choose A, B , C, F, G, H, T, U or W)
A = Standard plug
B = Standard jack
C = Standard plug with mating connector
F = Miniature plug
G = Miniature jack
H = Miniature plug with mating connector
T = Standard 1-1/2 inch split leads
U = 1-1/2 inch split leads with spade lugs

7. Sheath Material (consult green chart below for availability and pricing)
Limited Availability - consult yellow chart below for availability with sheath diameter & calibration type.
A = 304SS
F = 316SS
Q = Alloy 600

8-9. Sheath Length "L" (in whole inches) - (enter two digits 00 to 99)
Tens - Ones

10. Sheath Length "L" (fractional inches) - (choose 0 or 4)
0 = 0
4 = 1/2

11. Junction Type (choose D, H or W)
D = Exposed Dual, Isolated
H = Grounded Dual, Common
W = Ungrounded Dual, Isolated

12. Calibration (choose E, J, K,T, 2, 3, 4 or 8)
Limited Availability - consult yellow chart below for availability with sheath diameter & sheath material.
E = Standard Limits Type E
J = Standard Limits Type J
K = Standard Limits Type K
T = Standard Limits Type T
2 = Special Limits Type E
3 = Special Limits Type J
4 = Special Limits Type K
8 = Special Limits Type T

13-14. Lead Length "E" (feet) - (enter two digits 01 to 99)
Tens - Ones

15. Special Requirements
0 = Standard 300°F (150°C) potting
H = 1000°F (540°C) potting - only available with fiberglass lead wire (item 4 A,B,J,K,R,S)
M = 500°F (260°C) potting

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


Options 3, 7 & 12
Calibration & Sheath Availability

Sheath Diameter
Sheath
Material		 0.063
(E)		 0.125
(G)		 0.188
(H)		 0.250
(J)
304SS
(A)		 --
--		 J
3		 J
3		 J, K
3, 4
316SS
(F)		 --
--		 E, T
2, 8		 K, T
4, 8		 E, K, T
2, 4, 8
Alloy 600
(Q)		 K
4		 K
4		 K
4		 K
4
This page last modified on 1/17/2023
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