Supervisory switch is preset and tested in accordance with all applicable agency requirements at the factory. No adjustment is possible once the valve is assembled.
监控开关都是按照所有相关管理机关的要求在工厂进行预置和测试。一旦阀门装配后，就不可能进行调整。
2
The preset can be done by two calibrated dials, a coarse adjustment calibrated dial and a fine adjustment calibrated dial.