초록 ▼

An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly.

An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly. According to another aspect of the present invention, the controller uses a novel methodology of sensing water level using conductivity probes. An embodiment of this methodology uses the charging and discharging of a capacitor through a resistive value to sense the presence of water.

대표청구항 ▼

An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly.

An improved boiler water-level controller. According to one aspect of the present invention, a positive blowdown signal is presented to indicate to the operator that the alarm probe is in steam; performing blowdown until this indicator turns on helps ensure that the alarm probe is working properly. According to another aspect of the present invention, the controller uses a novel methodology of sensing water level using conductivity probes. An embodiment of this methodology uses the charging and discharging of a capacitor through a resistive value to sense the presence of water. , wherein the portion of the fraud indicator means is partially detached when a top wall of the counter comes into contact with said portion of the fraud indicator means. 7. A fluid meter according to claim 5, in which the portion of the fraud indicator means is completely detached when a top wall of the counter comes into contact with said portion of the fraud indicator means. 8. A fluid meter, comprising a meter body having means for measuring a fluid flow rate, a counter mounted on the meter body and provided in its top portion with means for displaying the quantity of fluid that has been consumed, and in its bottom portion with converter means for converting the fluid flow rate into the quantity of fluid that has been consumed, and fraud indicator means associated with the top portion, wherein, a portion of the fraud indicator means associated with the top portion being responsive to an attempted fraud on the meter by becoming irreversibly deformed, said portion of the fraud indicator means being visible from outside the counter and operating to penetrate into the converter means in order to block the operation of said converter means in response to an attempted fraud.