1·Dual limit relays contain two comparators and potentiometers operating into a single electro - mechanical relay.
双限继电器包含两个比较器和一个电位器，在一个单一的机电继电器下运行。
2·For this the analog output voltage of the sensor circuit is sent to 3 comparators with hysteresis.
这个传感器的电路模拟输出电压发送到3迟滞比较器。