Fixed Thread Explosion-proof Thermal Resistance WZP-240

Product Detail

WZP TYPE explosion-proof thermal resistance


Product introduction

WZP TYPE explosion-proof thermal resistance is a temperature sensor. It is widely used in automatic control system of Chemical industry. Through temperature sensor,it can transform the temperature parameters of the control object to  electric signals, then delivery them to display instrument ,recorder, regulator, and carry out detection ,control and adjustment to the system. In chemical factories, there are always many flammable and explosive chemical gas, steam, hydrocarbon etc. in production field. It is very dangerous to use normal thermal resistance, and will cause explosion of environment gas easily. So, we must use explosive-proof or intrinsic safety type thermal resistance as temperature sensor in these places. Besides, it has Multiple explosive-proof types, good explosion-proof performance, compression spring type thermal components, good anti-vibration performance, high mechanical strength and good pressure-resistant properties.

Working principle

Explosive-proof or intrinsic safety type thermal resistance has similar structure and principle with fabricated thermal resistance. The difference is that explosive-proof or intrinsic safety type thermal resistance's junction box(shell) is designed to use explosion-proof special structure and is cast by high-strength aluminum alloy. It has enough inside space, wall thickness and mechanical strength, and the heat stability of its rubber sealing ring satisfy the national anti-explosion standard. So, when the explosive gas mixture inside junction box  happen explosion accident, its internal pressure won't destroy junction box, and the resulting heat energy can not spread beyond booster.

 Main Technical Parameters

Range specifications

Type	Degree	Temperature Range?	Accuracy Class	Allowable Deviation ?t ?
WZP WZP2	Pt100	-200~500	Class A	±(0.15 +0.002?t?)

Note: "t" is absolute value of measured temperature of temperature-sensing element.

Thermal response time

When temperature is under the step change, the input of thermocouplel changes to the time that 50% of the step change cost. It is called thermal response time, which is represented by T_0.5.

Nominal Pressure

Generally refers to the room temperature, protective tube will not crack under static pressure. Test pressure usually use 1.5 times of nominal pressure. Actually, Allowance nominal pressure is not only related to material Of protecting tube, diameter and wall thickness, but also related to its structural style, installation method, placed-depth and the types, flow rate of measured medium.

Thermocouple insulation resistance

The test voltage of the normal temperature insulation resistance: 500±50V DC.

The atmospheric conditions to measure the normal temperature insulation resistance: 15~35?, relative humidity 45%,  atmospheric pressure 86~106kPa.

 For thermocouple whose length>1m, the product of the normal temperature insulation resistance value and its length should not be less than 100 MO.M. That is to say Rr·L>100 MO·m L>1m.In the formula: Rr- value of thermocouple's normal temperature insulation resistance, MO;L- length of thermocouple, m. For thermocouple whose length=1m, the normal temperature insulation resistance value should not be less than 100 MO.

Explosion-proof type and level group

Explosion-proof level group: d?BT4/d?CT4  d?BT6/d?CT6

Intrinsic safety level group:ia?BT4/ia?CT4(multiplex type)

                                              ia?BT6/ia?CT6(multiplex type)

Enclosure protection class: IP65

Principle structure

Explosive-proof or intrinsic safety type thermal resistance has similar structure and principle with fabricated thermal resistance. The difference is that explosive-proof or intrinsic safety type thermal resistance's junction box(shell) is designed to use explosion-proof special structure and is cast by high-strength aluminum alloy. It has enough inside space, wall thickness and mechanical strength, and the heat stability of its rubber sealing ring satisfy the national anti-explosion standard. So, when the explosive gas mixture inside junction box  happen explosion accident, its internal pressure won't destroy junction box, and the resulting heat energy can not spread beyond booster.

For our products use above Explosive-proof special structure, they completely suitable to use in the range of d?BT4 to d?CT6?ibIIBT4?iaIIBT4?iaIICT6 explosion-proof category. As long as users follow the products use rules, products can achieve reliable explosion-proof effect.

Model Denotation

W	Z	P	SPEC
			-	Installing form
				1	No fixed device
				2	Fixed   thread
				4	Fixed   flange
				5	Loose   coupling type
				6	Fixed   thread taper tube type
					Junction box
					4	Explosive-proof   type
						0	16mm
						1	12mm
							Components form
							K	Armor type
W	Z	P	-	2	4	0

If the fixed thread explosion-proof thermal resistance wzp-240 for sale caters to your requirement, welcome to buy with us. As one of the leading such manufacturers and suppliers in China, we will offer you cheap price and excellent services.