Product Overview
Chemical specific explosion-proof thermocouples and thermal resistors are used as sensors and display instruments for temperature measurement and control, to directly measure and control the temperature of gases, liquids, and vapors in the production process.
The explosion-proof performance of the chemical special explosion-proof thermocouples and thermal resistance products produced by our factory is designed and manufactured in accordance with the national standard for explosion-proof electrical equipment for explosive environments (GB3836). The thermoelectric characteristics comply with international IEC standards and have been tested by the national instrument explosion-proof safety supervision station. The certificate numbers are GYB97172 and GYB97173, which are ideal temperature sensors for explosive environments. For pipeline temperature measurement in the fertilizer industry, with an explosion level not higher than Class II-B and a self ignition temperature not lower than T4 (135 ℃), it is a hazardous area in Zone 1 or Zone 2 (indoor or outdoor).
Technical Specifications
Basic Parameters

Category	graduation mark	Measurement range ℃	Nominal pressure (Mpa)	Precision equal pole
Nickel chromium nickel silicon	K	0~500	32	II
Nickel chromium copper nickel	E

Explosion-proof marking
The explosion-proof mark of the chemical special explosion-proof thermocouple is dIIBT4

d	II	B	T4
Explosion proof category (explosion-proof type)	for factory use	Explosion proof level	Temperature group

Explosion proof grade: dIIBT4
Shell protection level: IP54
Model representation
WR□－□□□

W Temperature Instrument	R thermocouple	□ Temperature measuring element material	□ Installation fixed form	□ Form of junction box	□ DesIgn Serial Number
		E nickel chromium copper nickel N nickel chromium nickel silicon	7-wire connection type	4 Explosion proof type	O

Model

category	model	graduation mark	Temperature measurement range ℃	structural characteristics	Sleeve Material	Specifications		Nominal pressure Mpa	Explosion proof equivalent pole
						Total length L (mm)	Insertion depth l (mm)
Chemical specific explosion-proof thermocouple	WRN-740 WRN2	K	0~500	weld pick up formula	20 number steel	260 275 290 310 330	100 115 130 150 170	32	dIIBT4
	WRE-740 WRE2	E