Dwyer Instruments UFC Series Manuale utente
Series UFC Ultrasonic Flowmeter Kit
Installation and Operating Instructions
Bulletin F-UFC
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Table of Contents
1: General Description 1
1.1 Introduction 1
1.2 Principles of Operation 2
1.3 Supplied Hardware 3
1.4 UFC Instrument 4
1.4.1 Connections 4
1.4.2 Keypad 5
1.4.3 Power supply 6
2: Installation 7
2.1 Safety Precautions and Warnings 7
2.2 Installing the UFC Instrument 7
2.2.1 Positioning the instrument 7
2.2.2 Mounting the instrument 8
2.2.3 Connecting the instrument 9
2.3 Installing the Ultrasonic Transducers 10
2.3.1 Transducer positioning 10
2.3.2 Transducer attachment 11
2.3.3 Attaching the guide rail to the pipe 12
2.3.4 Fitting the transducers 12
2.3.5 Transducer attachment (diagonal mode) 15
3: Operating Procedures 17
3.1 Setting-up the Instrument 18
3.1.1 Using the instrument for the first time 18
3.1.2 Changing the user language 19
3.1.3 Changing the date and time 19
3.2 Using the Quick Start Menu 19
3.3 Instrument Calibration 23
3.3.1 Adjusting the zero cut-off 23
3.3.2 Adjusting the set zero flow offset 23
3.3.3 Adjusting the calibration factor 24
3.3.4 Adjusting the roughness factor 26
3.3.5 Adjusting the damping factor 26
3.4 Outputs 28
3.4.1 Current output 28
3.4.2 Pulse output 30
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3.4.3 Alarm outputs 31
3.5 How to Measure Totalized Flows (manually) 34
3.6 Display of totalizers 35
3.7 Operation with an Energy Meter 35
3.7.1 Pulse output 35
3.7.2 Configuring the UFC 35
4: Data Logging 37
4.1 How to Set Up the Basic Logging Application to Memory 37
4.2 How to Set Up Automatic (Timed) Logging Mode 39
4.3 How to Download Logged Data 40
5: Maintenance & Repair 42
5.1 Introduction 42
5.2 General care 42
5.3 Warranty / Return 42
6: Troubleshooting 43
6.1 Overview 43
6.2 General Troubleshooting Procedure 44
6.3 Warning and Status Messages 45
6.4 Diagnostics Display 47
7: Options 49
7.1 Large Pipe Diameter Transducers 49
7.2 Transducer Holder Options 49
7.3 Extended Signal Cable Options 49
8: Specification 50
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1: General Description
1
1: General Description
1.1 Introduction
This manual describes the operation of the Dwyer UFC flowmeter. The flowmeter is designed to work with clamp-
on transducers to enable the flow of a liquid within a closed pipe to be measured accurately without needing to
insert any mechanical parts through the pipe wall, or protrude into the flow system.
Using ultrasonic transit time techniques, the UFC is controlled by a micro-processor system which contains a
wide range of data that enables it to be used with pipes having an outside diameter ranging from 0.5 to 79 inches
(13 to 2000 mm) and constructed of almost any material. This can be extended to pipes of up to 197 inches (5000
mm) using the optional type D sensors. The instrument will also operate over a wide range of fluid temperatures.
UFC standard features:
•Large, easy to read graphic display with backlight.
•Simple to follow, dual function keypad.
•Simple ‘Quick Start’ set up procedure.
•Continuous signal monitoring.
•Isolated pulse output (volumetric or frequency).
•Isolated current output (4 to 20 mA, 0 to 20 mA, or 0 to 16 mA).
•2x Isolated programmable alarm outputs.
•Password-protected menu operation for secure use.
•Signal diagnostics.
•Multi-function alarm outputs.
•Operates from Mains, 24 Vac, or 24 Vdc.
•Logging of Flows and Volume total.
•Output to USB pen
Volumetric flow rates are displayed in L/h, L/min, L/sec, gal/min, gal/h, USgals/min, USgals/h, Barrel/h, Barrel/
day, m³/s, m³/min, m³/h. Linear velocity is displayed in meters or feet per second. When operating in the ‘Flow
Reading’ mode the total volumes, both positive and negative, are displayed up to a maximum 12-digit number.
The flowmeter can be used to measure clean liquids or oils that have less than 3% by volume of particulate
content. Cloudy liquids such as river water and effluent can be measured along with cleaner liquids such as
demineralized water. In addition, the UFC can function as a data logger. When operating in this mode the logged
data, which includes the flow rates and totalizers, is stored in memory and can then be transferred to a USB
memory stick.
Typical UFC applications include:
•Sea or River water.
•Potable water.
•Demineralized water.
•Treated water.
The UFC is available in two model options. Model UFC-A is supplied with type ‘A’ transducers which are designed
to work with pipe diameters between 0.5 to 4.5 inches (13 to 115 mm). Model UFC-B is supplied with type ‘B’
transducers which are designed to work with pipe diameters between 2 to 79 inches (50 to 2000 mm). Both sets
of transducers use a common mounting system for pipe attachment, and throughout this manual any reference to
‘UFC’ applies to both ‘A’ and ‘B’ model variants unless otherwise stated.
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1: General Description
2
Note: In addition to the 'A' and 'B' type sensors, type 'D' sensors (option) are available for use on pipes up to 197
inches (5000 mm). These sensors have a different mounting method. See Paragraph 1.3 for further details.
1.2 Principles of Operation
Figure 1.1 Operating modes
When ultrasound is transmitted through a liquid, the speed at which the sound travels through the liquid is
accelerated slightly if it is transmitted in the same direction as the liquid flow, and decelerated slightly if
transmitted against it. The difference in time taken by the sound to travel the same distance but in opposite
directions is therefore directly proportional to the flow velocity of the liquid.
The UFC system employs two ultrasonic transducers attached to the pipe carrying the liquid and compares the
time taken to transmit an ultrasound signal in each direction. If the sound characteristics of the fluid are known,
Fluid flow
Fluid flow
Fluid flow
Fluid flow
Fluid flow
U
U
U
U
D
D
D
D
Separation
Distance
Separation
Distance
Separation
Distance
Separation
Distance
Reflex mode
Reflex mode (double bounce)
Reflex mode (triple bounce)
Diagonal mode
This is the mode most commonly used.
The two transducers (U & D) are attached
to the pipe in line with each other and the
signals passing between them are reflected
by the opposite pipe wall.
The separation distance is calculated by
the instrument in response to entered data
concerning the pipe and fluid characteristics.
In this mode the separation distance is
calculated to give a double bounce. This is
most likely to occur if the pipe diameter is
so small that the calculated reflex mode
separation distance would be impractical
for the transducers in use.
This illustration goes one step further to show
a triple bounce situation. This would normally
apply when working with very small pipes
relative to the transducer range in use.
This mode might be selected by the
instrument where relatively large pipes are
concerned. In this mode the transducers are
located on opposite sides of the pipe but the
separation distance is still critical in order
for the signals to be received correctly.
This mode can be used with the standard
‘A’ & ‘B’ transducer sets but for really large
pipe installations the optional transducer set ‘D’
might be recommended.
Upstream
transducer
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1: General Description
3
the instrument’s microprocessor can use the results of the transit time calculations to compute the fluid flow
velocity. Once the flow velocity is known the volumetric flow can be easily calculated for a given pipe diameter.
The system can be set up to operate in one of four modes, determined mainly by the pipe diameter and the type
of transducer set in use. The diagram in Figure 1.1 illustrates the importance of applying the correct separation
distance between the transducers to obtain the strongest, and therefore most reliable, signal.
1.3 Supplied Hardware
The supplied UFC components are shown in Figure 1.2.
Figure 1.2 Standard UFC equipment
UFC Standard equipment
•Instrument with backlit graphic display.
•Transducer cables (x2) 16.5 feet (5.0m) in length.
•Transducers ‘A-ST’ x2 (UFC-A) for use with pipes ranging 0.5 to 4.5 inches (13 to 115 mm).
•Transducers ‘B-ST’ x2 (UFC-B) for use with pipes ranging 2 to 79 Inches (50 to 2000 mm).
•Transducer holder for use with ‘A’ or ‘B’ transducers.
•Steel bands used to secure the transducer holder to the pipe.
•Acoustic couplant applicator.
•USB Memory stick.
•User documentation.
UFC Optional equipment
•Transducer set 'D' can be used for monitoring pipes of 59 inches to 197 inches (1500 to 5000 mm) outside
diameter, over a temperature range -4°F to +176°F (-20°C to +80°C). This optional kit is supplied in a
Acoustic
Steel
Transducer
Transducers
(Sensors)
UFC
Instrument
Mounting
Earthing
Transducer
Cables (x2)
User Documentation
Holder
Couplant
Applicator
(Ax2, or Bx2)*
Clamps (x2)
Bands (x2)
Cable Kit
Transducer Clamps
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1: General Description
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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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1: General Description
5
1.4.2 Keypad
The instrument is configured and controlled via a 15-key tactile membrane keypad, as shown in Figure 1.4.
Figure 1.4 UFC Keypad
Menus and the menu selection keys
Note: As a security measure, once the instrument has been set-up for the first time, a password is required to
gain subsequent access to the operating menus (see page 22).
The UFC menus are arranged hierarchally with the MAIN MENU being at the top level. Menu navigation is
achieved by three keys located on the right hand side of the keypad which are used to scroll UP and DOWN a menu
list and SELECT a menu item. When scrolling through a menu, an arrow-shaped cursor moves up and down the
left hand side of the screen to indicate the active menu choice, which can then be selected by pressing the ENTER
(SELECT) key.
Some menus have more options than can be shown on the screen at the same time, in which case the
overflowed choices can be brought into view by continuing to scroll DOWN past the bottom visible item. Menus
generally ‘loop around’ if you scroll beyond the first or last items.
If you select Exit on any menu it usually takes you back one level in the menu hierarchy, but in some cases it
may go directly to the ‘Flow Reading’ screen.
Some screens require you to move the cursor left and right along the display as well as up and down. This is
achieved using keys 5 (scroll LEFT) and 6 (scroll RIGHT).
Dual function numerical keypad
The block of keys shown in the center of the keypad in Figure 1.4 are dual function keys. They can be used to
enter straight-forward numerical data, select the displayed flow units, or provide quick access to frequently
required control menus.
Scroll UP
ENTER (SELECT)
Scroll DOWN
Scroll LEFT Scroll RIGHT Numerical keypad
with dual function keys
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1: General Description
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1.4.3 Power supply
Mains supply
As standard, the UFC instrument is designed to work with a mains supply of 86 to 236 Vac and 50/60 Hz. A mains
supply fuse is located adjacent to the mains power connection (see Figure 2.2).
24V Supply
An alternative 24 V (ac/dc) power supply module is available as a factory fitted option.
Power failure
The instrument will automatically power-up and become operational when the input power is applied. In the event
of a power failure, the instrument’s configuration parameters are stored in non-volatile memory which then allows
the instrument to return to normal operation immediately power is restored. A real time clock (RTC) records the
date and time of any power disruptions, and time-stamps any such occurrence in the output log. All data logging
ceases while power is unavailable.
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2: Installation
7
2: Installation
2.1 Safety Precautions and Warnings
2.2 Installing the UFC Instrument
2.2.1 Positioning the instrument
The UFC instrument should be installed as close as conveniently possible to the pipe-mounted ultrasonic
sensors. Standard transducer cables are 16.5 ft (5 m) in length with 33 ft (10 m) cables being optionally available.
Where, for operational reasons, it is not possible to mount the instrument this close to the sensors, bespoke
cables of up to 328 ft (1000 m) can be provided. Consult Dwyer for further information and availability.
A suitable mains supply must be available to power the instrument (an optional 24V (ac/dc) supply module is
available). The external supply must be suitably protected and connected via an identifiable isolator. A 500 mA
fuse is fitted internally in the instrument’s input supply line.
WARNING
LETHAL VOLTAGES
You may be exposed to potentially lethal (mains) voltages
when the terminal cover of this instrument is removed.
Always isolate the supply to this instrument before removing
the terminal cover.
WARNING
LETHAL VOLTAGES
This instrument must be installed by an electrically qualified
technician aware of the potential shock hazards presented
when working with mains powered equipment.
WARNING
SUPPLY EARTHING
If the equipment is powered from a 24 Vac supply then the
supply must be isolated from earth.
Caution
IP65 Enclosure Protection
Blanking plugs are fitted to the cable glands on leaving the manufacturer.
In order to preserve the enclosure’s IP65 rating, ensure that the blanking plugs
remain fitted in any unused cable gland.
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