Durant Products
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Flow Transmitter |
Durant |
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Eclipse Flow Totalizer / Ratemeter |
as a Signal Conditioner | |||
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Flowmeters are sensors that produce an electrical signal proportional to the rate of liquid or gas flow though a pipe. Numerous flowmeter types are available, including differential pressure, positive displacement, and by far the most common, magnetic turbine or paddlewheel flowmeters. The flowmeter signal usually goes immediately to a �black box� signal conditioner known as a flow transmitter, which in turn sends the amplified/scaled/linearized/etc. flow signal to a totalizer or a process controller.
Unlimited potential for any flow transmitter applications in a variety of industries:
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A bit more detail: Originally, the flowmeter signal would go to a flow totalizer to keep track of the total number of gallons, or liters, or barrels that went through the pipe. Nowadays, however, there is an increasing demand to feed the flowmeter signal to process control equipment such as a PLC or a PC. This equipment is often located a fair distance from the flowmeter installed in the pipe. The obstacle here is that no flowmeter produces a raw output signal that is directly compatible with a PLC or PC. A magnetic flowmeter generates a low level, AC pulse output that is very noise susceptible. A differential pressure flowmeter produces an analog voltage output proportional to the square of the flow rate. Typically, the process control equipment application demand is for a standard, linear 4-20 mA or 0-10 V flow signal for it's process control equipment. The conversion of one type of electrical signal into another is done by an electronic device known generically as a signal conditioner. In the flow world specifically, the signal conditioner is known as a flow transmitter. Significant cost is added to the project when flow transmitters are necessary. Furthermore, the transmitter may have to be calibrated at the factory for a user-specified flow range. Our Solution: An Eclipse can convert the raw flowmeter signal into a signalcompatible with process control equipment. The versatile Eclipse is favorably priced com- pared to conventional flow transmitters. The pulse input version can accept magnetic or positive displacement flowmeter signals in, and re-transmit a 4-20 mA and 0- 10 V signal out over a user-defined flow range. The analog version can do square root extraction on a differential pressure signal and put out the linear 4-20 mA and 0-10 V flow signal. Either version can be equipped with an RS-485 serial output option. This allows for conversion to RS-232 and transmission via a modem to a remote computer. Finally, any Eclipse can be equipped with an output transistor for the most basic flow transmitter function scaled pulse out to a remote totalizor PLC. The Eclipse throws in a local display of total and rate for the ultimate in signal conditioning.
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(Flow Batching- One Valve or Two) |
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| (Flow Batching PLC On Board) | |
| (Flow Rate) | |
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(Flow Transmitter) |