Metal tube float flowmeter flange type horizontal installation M3S LCD indicator (4-20mA output) with explosion isolation

Overview.

LZ series metal tube float flowmeter (also known as metal rotor flowmeter) is a variable area flowmeter, with simple structure, reliable work, wide range of applications, high accuracy, easy installation and so on. The series flowmeter and glass float flowmeter comparison, with high pressure, high temperature, strong sense of security, according to the flow output of 4 ~ 20mA current signal can be used for automatic detection and control, etc.. And can be applied to opaque media and corrosive media flow measurement. The two series are divided into field indication type and field indication with electricity remote transmission type.

Metal tube float flowmeter is composed of measuring tube body, orifice plate and float (cone tube and float) and magnetic conversion instrument. According to the installation method can be divided into vertical basic type, horizontal type; according to the connection method is divided into flange type, thread type and clamp type, which corresponds to the caliber of the flow range and the same basic performance. The series flange vertical type can be lined with PTFE or F46 corrosion resistant type.

The working parameters of this series instrument and its conversion and correction are provided by the instrument calculation software with standard calculation methods to ensure the accuracy and measurement reliability of the instrument.

◆Product execution standard: JB/T6844-2015 (industry standard)

◆General standard of flange: GB/T9115.1-2010 (national standard)

◆Type approval certificate: 2010F449-33

Working principle.

LZ series metal tube float flowmeter for variable area flowmeter, that is, in the vertical measuring tube of the flowmeter, when the fluid flows upward through the tube, the float moves upward, at a certain position the lift force on the float and the float gravity to reach a balance, at this time the float and the orifice plate (or cone tube) between the circulation ring gap area to maintain a certain.

The ring gap area is proportional to the float's rise height, i.e. a certain height of the float represents the size of the flow. When the float moves up and down, the position is transferred to the external indicator in the form of magnetic coupling, so that the pointer of the indicator follows the float movement and indicates the flow rate on the dial. The electric remote transmission type is to indicate the flow rate on the spot with the pointer and then convert the flow rate value into a standard 4-20mA signal accurately through the angular displacement sensor or electric transmission circuit.

为了确保金属转子流量计正常工作并达到要求的测量精度，一般应注意以下几点：

金属转子流量计务必竖直安装，液体自下而上流过流量计，且垂直度优于2°，水准安装时水平交角优于2°；

安装在工艺管线里的金属管浮子流量计需加旁通，便于解决故障或吹洗时不影响生产；

金属转子流量计入口应有5倍管经以上长度的直管段，出口应有250mm直管段，以确保仪表测量精度；

如果物质中含有铁磁性物质，应安装磁过滤器；

如果物质中含有固体杂质，应考虑在阀门和直管段之间加装过滤器；

当用以气体测量时，面板式流量计生产应确保管道压力不小于5倍流量计的压力损失，以使浮子稳定工作；

假如待测物质的温度高过220℃或液体温度过低易发生结晶时，需采用隔热保障措施时，应选用筒夹型，便于开展制冷或保温；

管路法兰、紧固件、密封垫与流量计法兰规范相同才能使仪表正常安装运作；

该产品一般在设备正常运转后，不需要维护，故障多发生在设备刚启动时，因为管路吹洗不干净，而发生浮子被固态颗粒卡死状况，这时指示仪的指针停在一位置不动。