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Flameproof bimetallic thermometer

The WSSX series explosion-proof electrical contact
Description

I. Product Overview

The WSSX series explosion-proof electrical contact metal bimetallic thermometer shell is made of aluminum alloy. Through the aluminum alloy shell, the circuit of sparking and arcing in the instrument can be separated from the explosive gas mixture outside the watch case, so as to achieve the purpose of flameproof.
The performance of the bimetallic thermometer of the explosion-proof electrical contact is in line with the 1 part of the BG3836.1-2000 explosion-proof electrical equipment for explosive atmospheres: General requirements and the second part of the GB3836.2-2000 explosion-proof electrical equipment for explosive atmospheres: the standard of flameproof electrical equipment "d".
The bimetallic thermometer of the explosion-proof electrical contact has an electrical contact device, that is, a mechanical electrical contact. When the temperature of the tested medium changes, the thin shaft and the steering gear of the free end drive the pointer and the moving contact to rotate. The temperature change value is indicated on the scale plate. When it contacts or disconnects with the fixed contact point (upper and lower limit contacts), the relay and contactor in the circuit system are moved to achieve the purpose of automatic control and alarm.
The WSSX series explosion-proof electrical contact bimetallic thermometer is a single needle indicating thermometer, which is fixed by one end of a bimetallic strip twisted around a spiral tube and connected with a pointer by a free end and rotated with the change of temperature, and drives the pointer to rotate to indicate the temperature. It is the temperature measurement of liquid, steam and gas medium and solid surface in the range of -80 to +500 C in the process of petroleum, coking, chemical, pharmaceutical and other enterprises.
Two. Main technical parameters
Scale nominal diameter: 100
Thermal response time: less than 40s
Flameproof level: DIIBT4
Rated power: 10VA
Zui high working voltage: 220V

* high working current: 0.7A
Three. Selection of bimetal thermometers for explosion-proof electrical contacts:

WSS





Bimetallic thermometer


X






Electrical contacts


-4





Dial diameter 100

 

Dial form

Zero




axial

One




radial

Eight




universal

 

 

Install fixed form

Zero



No fixed device

One



Movable external thread

Two



Movable internal thread

Three



Fixed thread

Four



Fixed flange

Five



Sleeve thread

Six



Clamp flange

Flameproof

B


Flameproof level ExdiiBT4

 

Contact protection form

M

Upper and lower limit (not specified)

N

Double ceiling

P

Double lower limit

Selection parameters: after selecting the above models, the temperature range of the thermometer should be provided (the recommended range of calibration range * the maximum value is 1.5~2 times of normal service temperature), the depth of penetration, the diameter of probe rod, the material of probe rod, and the working pressure of the measured medium.  
Four. Measuring temperature range

ModelTemperature range CAccuracy gradeProtective tube materialSpecifications

Installation device

WSSX-410B

-80-+40

-40-+80

0-50

0-100

0-150

0-200

0-300

0-400

0-500

One point five

1Cr18NI9Ti

Three hundred and four

Three hundred and sixteen

316L

Haste C-276

H.AIIoyc-276

Seventy-five

One hundred

One hundred and fifty

Two hundred

Three hundred

Four hundred

Five hundred

Seven hundred and fifty

One thousand

Thread without fixtures
WSSX-480B
WSSX-411BMovable external thread
WSSX-481B
WSSX-412BMovable internal thread
WSSX-482B
WSSX-413BFixed flange
WSSX-483B
WSSX-414BFixed thread
WSSX-484B
WSSX-415BSleeve thread
WSSX-485B
WSSX-416BClamp flange
WSSX-486B



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