Dwyer UFC User Manual download pdf (Page 8)

1: General Description

separate case and includes the type 'D' transducers together with ratchet straps and holders for attaching

the transducers to the pipe.

1.4 UFC Instrument

The UFC is a microprocessor controlled instrument operated through a menu system using an inbuilt LCD display

and keypad. It can be used to display the instantaneous fluid flow rate or velocity, together with totalized volumes.

The instrument also provides an isolated current output, or variable pulse output, that is proportional to the

measured flow rate and can be scaled to suit a particular flow range. Two isolated alarm outputs are provided

which can be configured in a number of ways. For example, to operate when the flow rate exceeds a specified

maximum or minimum value.

Figure 1.3 Instrument details

1.4.1 Connections

Transducer connections

The transducers are connected to two coaxial sockets located on the bottom left-hand of the instrument. The silk-

screen above these connectors show a red and blue triangle and a direction of flow symbol. For a positive flow

reading, it is important that the upstream transducer is connected to the RED socket and the downstream

transducer to the BLUE one. It is safe to connect or disconnect these cables while the instrument is switched on.

4 to 20 mA, ‘Pulse’, and Alarm I/O connections

The 4 to 20 mA, ‘pulse’, and alarm I/O cables, enter the bottom of the instrument via two cable glands and

connected internally to a terminal block. Full details of the terminal connections are provided in Chapter 2

(Installation).

Power supply

Two cable glands located on the bottom right-hand side of the instrument are available for the power supply

cable. Two sizes of glands are provided to accept cables of different diameters.

Keypad

LCD Display

Coaxial cables to transducers

Cable glands for

Small & Large Glands

for power connection

Alarms & I/O connections

Blue = Downstream

Red = Upstream

USB Connector

(for memory key)

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Dwyer UFC User Manual Page 8