Watlow thermocouple products

Watlow thermocouple products

Product Core Overview

The Watlow thermocouple product line covers multiple scenarios such as general industry, high temperature, and precision measurement. It adopts ASTM standard calibration types (J/K/E/T/N/R/S/B, etc.) and is based on structural designs such as mineral insulation (MI), metal sheath, and fiberglass/PFA insulation. It has characteristics such as fast response, corrosion resistance, and high temperature resistance. The temperature measurement range covers -40 ° C to 1700 ° C and is suitable for various fields such as food processing, heat treatment, semiconductor manufacturing, and diesel engine post-processing.

Core advantages:

Diversified structure: including universal tube wire type, mineral insulation type, and micro coil (MICROCOIL) ™）、 Radio frequency compatible (TR), multi-point temperature measurement, etc., suitable for different installation and environmental requirements.

Accurate and stable: Following ASTM E230 calibration tolerances, some models have an accuracy of ± 1 ° C and a repeatability of 1% -2%. It supports three types of junctions: grounded/ungrounded/bare.

Durable protection: Sheath material can be selected from 304/316 stainless steel Alloy 600、Haynes ®  230, some products come with PFA coating or fiberglass weaving protection, which is corrosion-resistant and resistant to electromagnetic interference.

Product classification and detailed features

（1） Universal thermocouple (Tube and Wire series)

1. Core positioning and applicable scenarios

For general industrial scenarios with medium to low temperatures (-200 ° C to 900 ° C), such as food oven temperature control, medical equipment temperature monitoring, pipeline antifreeze, packaging machinery, etc., emphasis is placed on installation flexibility and cost-effectiveness, supporting multiple fixing methods and insulation options.

2. Typical models and structural characteristics

Model series, structural design, installation method, key parameters, applicable scenarios

Style 10/11 (spring adjustable) bendable sheath (300 series stainless steel), spring loaded design with perforated installation, suitable for different hole depths sheath diameter of 3/16 inches, wire insulation optional fiberglass/PFA, temperature range -200 to 760 ° C (J-type) mold plates, heating plate surface temperature measurement

Style 20/21/22 (rigid sheath) straight/45 °/90 ° curved rigid sheath, compression sealed installation through the cabin wall, waterproof immersion sheath diameter of 1/8-3/16 inches, optional exposed/grounded/ungrounded junction, temperature range -200 to 1260 ° C (K-type) liquid tank, steam pipeline temperature measurement

Style 72 (clamp type) stainless steel pipe clamp+grounding junction, no drilling requirement for pipe surface fixation, compatible with 11/16-7 inch diameter wires with stainless steel braided protection, temperature range -200 to 760 ° C (J-type) chemical pipelines, HVAC systems

Style 74/75 (gasket type) brass/stainless steel thin gasket (0.016-0.01 inch thick), low profile design clamped between equipment components with a temperature measurement point thickness of only 0.4mm, does not affect component fit, temperature range -200 to 350 ° C (T-shaped) circuit board, precision component surface temperature measurement

Style 65 (PFA coating) 304 stainless steel sheath coated with 0.01 inch PFA coating threaded installation, epoxy seal resistant to acid and alkali corrosion, temperature range -200 to 300 ° C (T-shaped) electroplating tank, acid liquid temperature measurement

3. Universal common advantages

Rich insulation options: fiberglass (temperature resistant to 480 ° C), PFA (temperature resistant to 260 ° C), fiberglass+stainless steel weaving (wear-resistant), suitable for different environmental protection needs.

Flexible terminals: Supports 2.5-inch splitter, # 6 shovel shaped terminals, standard male and female plugs, 1/4-inch inserts, etc., compatible with controller/PLC connections.

Low cost adaptation: Standardized production, short delivery cycle, suitable for batch universal scenarios.

（2） Mineral Insulated (MI) Thermocouple (XACTPAK) ®  Series)

1. Core positioning and applicable scenarios

For extreme environments such as high temperature, high vibration, and high pressure, such as industrial furnaces, turbines, nuclear reactors, and semiconductor epitaxial equipment, a metal sheath+mineral insulation structure is used, which has high temperature resistance, impact resistance, and fast response characteristics.

2. Structural principles and key advantages

Structural composition: The inner core is a thermocouple wire (such as K-type nickel chromium nickel silicon), filled with compacted MgO (magnesium oxide) insulation in the middle, and the outer layer is a metal sheath (304/316 stainless steel, Alloy 600, etc.) with a minimum diameter of 0.02 inches (0.5mm).

Core advantages:

High temperature resistance: The highest temperature resistance is 1700 ° C (Type B), far exceeding the general type.

Quick response: The smaller the diameter of the sheath, the faster the response. The response time of a 0.032-inch grounding structure in still water is less than 0.02 seconds.