Emerson IFT9701 instruction manual Pulse output

Power Supply and Output Wiring continued

4.4.4Pulse output

The pulse output is a passive, open collector interface that can be connected to a pulse counter such as the Micro Motion Series 3000 applications platform. The output has a range of 0.1 to 7200 Hz, which represents the mass or volume flow rate. At the factory, the output is scaled so that the frequency is proportional to the range of flow rates measured in the application.

•The pulse output is galvanically isolated to ±500 VDC from the rest of the flowmeter.

•When connected to the Series 3000 applications platform, the pulse output does not require an external power source. Otherwise, the pulse output requires a 5–30 VDC power source.

•In the ON state, voltage will be less than 1 V.

CAUTION

Exceeding specified current limit through the pulse output circuit will damage the flowmeter.

Make sure the current through the pulse output circuit does not exceed 10 mA.

For acceptable resistance values at on and off states of the pulse output, see illustration below.

	Acceptable
Voltage (Volts)	resistance

Resistance (Ohms)

•For wiring to any pulse counter, see Figures 4-6 and 4-7.

•For wiring to the Series 3000 applications platform, see Figures 4-8through 4-10.

Before You Begin

Getting Started

Mounting the Remote Transmitter

Power Supply and Output Wiring

Model IFT9701 Transmitter Instruction Manual 25