CT-301 Small Round Head Thermometer

Small round-head terminal box design, economical and practical temperature probe.

The CT-301 is a common small round-head terminal box type temperature sensor, widely used in temperature monitoring of industrial equipment, pipelines, control boxes, and automated processes. It features easy installation, durable construction, and flexible specifications, making it an economical RTD/thermocouple temperature sensing solution.

Description

The CT-301 features a compact, round-head terminal box design, making it lightweight and easy to wire, effectively reducing installation space limitations. It is suitable for long-term temperature monitoring in various industrial environments. The sensing element can be either a thermocouple or a platinum resistor, and the probe length and material can be customized to suit the application environment.

Specifications

Sensing Element

Thermocouples: Types K, T, J, R, S, and B
Platinum resistors: PT100, PT1000, PT500

Accuracy Class

Class A, Class B, 1/10 DIN, 1/5 DIN, 1/3 DIN (select according to application)

Wiring Method

Thermocouple: 2-wire
PT100: 3-wire

Temperature Range (depending on the sensing element)

Type K thermocouple: Approximately –50°C to +1200°C
Type T thermocouple: Approximately –250°C to +350°C
J-type thermocouple: approx. –40°C ~ +750°C
R/S/B type thermocouple: approx. +600°C ~ +1600°C
PT100: –200°C ~ +500°C (depending on package and wire material)

Probe Appearance and Dimensions

Standard rod-shaped probe diameters: Φ3.2, Φ4.8, Φ5, Φ6.3 mm, Φ9.5 mm (custom sizes available)
Probe length: can be specified as needed (e.g., 30mm, 50mm, 100mm and above)

Installation

Insertion/contact sensor head, threadless design.
It can be freely inserted into slots, embedded in devices, or secured with straps.

Selection of Probe Material

Material	Description
304SS	Stainless steel for general industrial use, with excellent corrosion resistance.
316SS	High corrosion-resistant stainless steel, suitable for chemical or humid environments.
310SS	High-temperature stainless steel with excellent heat resistance.
P4	High-purity ferritic alloy, resistant to high temperatures and corrosion.
INCONEL	Ultra-high temperature nickel-based alloy, resistant to oxidation and acidic environments.
Hastelloy-C	High corrosion resistant nickel-chromium alloy, resistant to strong acid environments.
Hastelloy-B	High acid resistance nickel-chromium-molybdenum alloy, suitable for extremely acidic environments.

Application Examples

Internal temperature monitoring of industrial machinery and equipment.
Automatic control system and internal measurement of control box.
Pipeline or metal surface temperature sensing.
Temperature monitoring of test fixtures or modules.
Process temperature detection in food, chemical, and automated production lines.