parameters of gas filled thermometer :

1,  temperature range:- 40 ~ 600 ℃  

2,  ambient temperature:- 10 ~ 55 ℃ 

3,  relative humidity: 95% or less

4,  precision grade :1.5 on the Richter scale are unlikely

5,  time constant of the 60 s or less

6,  probe pressure or less mpa

7,  probe diameter: phi 8-10 mm, movable external thread: M27 * 2

8,  PT100 thermal resistance (single, double output) or 4-20 ma current output

9,  protection grade: IP55