How to purchase a good quality bimetallic thermometer

Ask purchasing bimetallic thermometer is a university. Because there are many different specifications and types, here we introduce how to purchase a good quality bimetallic thermometer. 1. Bimetallic thermometer works: double metal thermometer is with different expansion coefficient of two kinds of metal or alloy plate temperature sensing element of firmly together, generally made spiral wound, usually at one end fixed and the other end with a pointer. When the temperature changes, the temperature sensing element change of curvature, free end rotation, drive the pointer on the dial indicator temperature values. 2. The way: the installation of the bimetallic thermometer? Axial type: refers to the axis of the heat pipe with dial perpendicular to the plane. Radial type: refers to the axis of the heat pipe with dial parallel plane. Universal type: refers to the axis of the heat pipe with dial plane can be adjusted at any Angle. 3. Bimetallic thermometer thread: usually have moving outside screw thread, fixed external thread, movable internal thread, fixed internal thread and the set of threads. Thread sizes to concrete, such as: movable external thread M27 * 2. 4. Bimetallic thermometer temperature range: in general, low temperature: - 0 - 40 ~ + 80 c 100C,0- 150 c, medium temperature: 0 0 - 200 c 300 c, the high temperature: 0 0 - 400 c 500C。 5. Bimetallic thermometer heat pipe diameter: in general, because our company mainly export, so the standard heat pipe diameter is 6. 35 mm, the other 6 mm, 8 mm, 10 mm optional. 6. Bimetallic thermometer heat pipe length: 50 mm to 2000 mm is optional. 7. The precision of the bimetallic thermometer: & plusmn; 1. 5%. 8. The surface of the bimetallic thermometer: diameter is usually 100 mm, 50 mm, other 60 mm, 80 mm, 120 mm, 150 mm is optional. Through introducing the instrument, the procurement bimetallic thermometer is have a more clear understanding!