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Watlow Style AR Connection Head
MI Thermocouple
Mineral Insulated - Dual Element

The Watlow Style AR Mineral Insulated Thermocouple temperature sensor "connection head" style come with a choice of 5 different connection heads. Because it is constructed with XACTPAK mineral insulation, the thermocouple is protected from moisture, thermal shock, high temperatures and high pressure.

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 AR Dual Element Thermocouple build the desired 15-digit model part number using the ordering information form below.

Download Watlow Style AR Thermocouple Catalog Page (pdf)
Custom Ordering Information -
Watlow Style AR Dual Element Thermocouples
A R ___ ___ ___ 0 ___ ___ ___ ___ ___ ___ 0 0 0
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
AR = Mineral insulated thermocouple with connection head

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

4. Connection Head (choose C, D, E or H)
C = Polypropylene
D = Cast Iron
E = Aluminum
H = Exposion Proof

5. Fittings (choose 0, F, H, 2 or 5)
0 = Fixed single thread 1/8 NPT 303SS
F = Fixed double thread 1/2 NPT 303SS
H = Adjustable spring loaded double threaded 1/2NPT 316SS

6. Unused - Enter "0"
0 = Unused

7. Sheath Material - 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 01 to 99)
Tens - Ones

10. Sheath Length "L" (fractional inches) - (choose 0, 1, 2, 3, 4, 5, 6 or 7)
0 = 0
1 = 1/8
2 = 1/4
3 = 3/8
4 = 1/2
5 = 5/8
6 = 3/4
7 = 7/8

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
N = Standard Limits Type N
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. Unused - Enter "00"
00 = Unused

15. Special Requirements
0 = None

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


Options 3, 7 & 12
Calibration & Sheath Availability

Sheath Diameter
Sheath Material 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
This page last modified on 1/17/2023
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