概述
The PR 6211 range of load cells is specially designed for weighing silos, tanks and process vessels. The unique design principle facilitates a particularly compact construction and, as a result, the unit can be used even in restricted space conditions. The FlexLock installation kits counterbalance movements arising from mechanical or thermal expansion or contraction of the vessel or its supporting construction.
光栅式传感器利用光栅形成的莫尔条纹把角位移转换成光电信号（图2）。光栅有两块，一为固定光栅，另一为装在表盘轴上的移动光栅。加在承重台上的被测物通过传力杠杆系统使表盘轴旋转，带动移动光栅转动，使莫尔条纹也随之移动。利用光电管、转换电路和显示仪表，即可计算出移过的莫尔条纹数量，测出光栅转动角的大小，从而确定和读出被测物质量。
特性
30kg… 10t Type D1
500kg… 5t Type LT
1. Easy to install in limited space
2. Easy corner adjustment by matched D1 load cell outputs
3. Full stainless steel construction
4. Wide temperature range
5. Resistant against vibration
6. Hermetically sealed, IP 68 (depth of 1.5m for 10,000 hrs.), IP 69K
7. Ex-version available (500kg… 10t)
8. W&M approval (acc. OIML R 60)
9. Integrated overload protection for up to 300kg capacity
码盘式传感器 的码盘（符号板）是一块装在表盘轴上的透明玻璃，上面带有按一定编码方法编定的黑白相间的代码。加在承重台上的被测物通过传力杠杆使表盘轴旋转时，码盘也随之转过一定角度。光电池将透过码盘接受光信号并转换成电信号，然后由电路进行数字处理，最后在显示器上显示出代表被测质量的数字。光电式传感器曾主要用在机电结合秤上。
