Explosion-Proof Thermocouple / RTD

Key Features

• Insulation Resistance at Room Temperature
• ThermocoupleMeasuring range & tolerance
• RTD (Resistance Thermometer)Measuring range & tolerance
• Ex marking ● Terminal head type
• Explosion-proof level
• Ingress protection: IP65
• Terminal type
• Examples of flammable gas and vapour classes and temperature classes
• Without fixing deviceThermocouple
• :1) Class I flameproof thermocouples are supplied per agreement,
• Fixed-thread thermocouple
• :1) Class I flameproof thermocouples are supplied per agreement,
• Fixed-flange thermocouple
• :1) Class I flameproof thermocouples are supplied per agreement,
• Swivel unionThermocouple
• Straight unionThermocouple
• :1) Class I flameproof thermocouples are supplied per agreement,

Technical Specifications

Usually used together with indicating instruments, recording instruments and computer systems. It directly measures liquids, steam and gaseous media as well as solid surfaces within 0–1300 °C at production sites where explosive hydrocarbons are present.

Operating Principle

Explosion-proof thermocouples / RTDs work on the flame-gap principle. Components such as the terminal head are designed with sufficient strength, and all parts that could produce sparks, arcs or dangerous temperatures are sealed inside the terminal head enclosure. When an explosion occurs inside the enclosure, the flame is extinguished and cooled through the joint gap so that the flame and temperature cannot be transmitted outside, thus allowing temperature measurement.

For explosion-proof thermocouples, at an ambient temperature of 15–35 °C, relative humidity not exceeding 80%, and a test voltage of 500±50 V (DC), the insulation resistance between the electrode and the outer sheath shall be ≥ 100 MΩ·m.

For explosion-proof RTDs, at an ambient temperature of 15–35 °C, relative humidity not exceeding 80%, and a test voltage of 10–100 V (DC), the insulation resistance between the resistor and the outer sheath shall be ≥ 100 MΩ.

Features

○ Various explosion-proof types with good explosion-proof performance,

○Compression spring sensing element with good vibration resistance,

○Wide measuring range,

○High mechanical strength and good pressure resistance,

Note: t is the temperature measured by the sensing element.

○ Electrical equipment category

Class I — electrical equipment for use in underground coal mines

Class II — electrical equipment for factory use

O Explosion-proof grade

The explosion-proof grade of explosion-proof thermocouples is divided into three classes A, B and C according to the maximum safety gap of the explosive gas mixture in which they are used.

O Temperature class

The temperature class of explosion-proof thermocouples is divided into T1–T6 according to the maximum permissible surface temperature of their exposed parts.

EXdⅡ□T□

ExiaⅡ□T□

○ dIIBT□ class

○ dIICT□ class

Class IIA

Class IIA

Class IIB

Model Numbering System

2) Class A flameproof RTDs are supplied per agreement; their structure is the same as that of thermocouples and their performance the same as standard RTDs,

3)Protection Tube MaterialSupplied per agreement。

2) Class A flameproof RTDs are supplied per agreement; their structure is the same as that of thermocouples and their performance the same as standard RTDs,

3)Nominal pressure≤10MPa;

4)Protection Tube MaterialSupplied per agreement。

2) Class A flameproof RTDs are supplied per agreement; their structure is the same as that of thermocouples and their performance the same as standard RTDs,

3)Nominal pressure≤2.5MPa;

4)Protection Tube MaterialSupplied per agreement，

5) The flange is determined by user requirements.

2) Class A flameproof RTDs are supplied per agreement; their structure is the same as that of thermocouples and their performance the same as standard RTDs,

3)Protection Tube MaterialSupplied per agreement，

4) Unless otherwise agreed, L is for reference only; the insertion length of the thermocouple shall equal the U dimension of the thermowell,

5) See page 123 for thermowell types.

Ordering & Inquiry

For selection guidance, specification confirmation or quotation, please call 0512-57892201, Mobile 13451695112, or submit an online order. Suzhou Dingluxuan Sensor Technology Co., Ltd. provides a complete matching service from temperature sensing elements to complementary ceramic insulation parts.

To order this product or get selection guidance, please call +86 512-57892201 or submit an online order.