Explosion-proof thermocouple

。">5, according to the wiring diagram to the thermocouple junction box connection, and display instrument is connected on the dial corresponding. Connection box can not contact with the wall of the measured medium pipeline, ensure the junction box temperature not exceeding 100 DEG C. Outlet hole junction box should prevent due to poor sealing, water vapor dust deposition caused by short circuit terminal.

Seven, the measurement range and basic error limit:

Thermocouple type	Code	Graduation	measuring range	Basic error limit
Nichrome constantan	WRK	E	0-800 C	+ 0.75%t
Nickel chromium nickel silicon	WRN	K	0-1300 C	+ 0.75%t
13- platinum rhodium	WRB	R	0-1600 C	+ 0.25%t
Platinum Rhodium 10 platinum	WRP	S	01600 C	+ 0.25%t
30 Platinum Rhodium Platinum Rhodium 6	WRR	B	0-1800 C	+ 0.25%t

Note: t is the sense of temperature measured temperature component values (c) thermal inertia level 

Thermal inertia level	Time constant (seconds)	Thermal inertia level	Time constant (seconds)
I	90-180	III	Practice
II	3090	IV	< 10

。">Nominal pressure thermocouple: generally refers to the static outer protective tube can withstand working temperature and pressure rupture. 
The depth of the thermocouple insert: should not be less than 8-10 times the diameter of the protective sleeve (Frederick product exception) 
，相對(duì)濕度＜80％時(shí)絕緣電阻≥5兆歐（電壓100V）。">Insulation resistance: when the ambient air temperature is 15-35 DEG C, relative humidity is less than 80% when the insulation resistance is more than 5 megohm (voltage 100V).  ，當(dāng)相對(duì)溫度為93± 3℃ 時(shí)

、 防爆等級(jí)；">3, explosion-proof grade;