BASI BUFM660 Series Manuale utente

MANUAL

Ultrasonic Open Channel Flow Meter

 
 

Catalog 
Introduction....................................................................................................................... 2 
1 Application...................................................................................................................... 2 
2 Features ........................................................................................................................... 2 
3 Structure .......................................................................................................................... 3 
4 Measuring principle: Time-of-flight method................................................................... 4 
5 Technical data.................................................................................................................. 5 
Installation......................................................................................................................... 6 
1 Installation considerations............................................................................................... 6 
2 Mounting dimensions...................................................................................................... 9 
Wiring.............................................................................................................................. 12 
1 The host......................................................................................................................... 12 
2 Wiring diagram.............................................................................................................. 12 
3 The cable ....................................................................................................................... 13 
4 The terminal blocks....................................................................................................... 13 
Operation......................................................................................................................... 14 
1 Display and keys ........................................................................................................... 14 
2 Two working mode ....................................................................................................... 14 
Calibration....................................................................................................................... 22 
General consideration.......................................................................................................... 23 
Serial communication-Modbus-RTU.............................................................................. 23 
Address number................................................................................................................... 23 
Baud rate.............................................................................................................................. 23 
Parity Check........................................................................................................................ 24 
Function code...................................................................................................................... 24 
Abnormal corresponding..................................................................................................... 24 
Electrical connection........................................................................................................... 24 
The RTU mode.................................................................................................................... 24 
Trouble-shooting............................................................................................................. 27 

1. Introduction

1.1 Application

The BUFM660 series is a remote version ultrasonic open channel flow meters

(O.C.M.). It consists of two elements, a wall mounted host, which has a

display and an integral keypad for programming, and a probe, which must be

mounted directly above the surface to be monitored. Both of the host and the

probe are plastic leak-proof structure.

The BUFM660 series OCM can be widely applied to the environmental

protection, water treatment, irrigation, chemical, and other industries.

1.2 Features

BUFM660 series O.C.M. is capable of the following functions:

High detection accuracy, the flow meter measurement changes with 1mm,

the accuracy of change in level is 1 mm;

Suitable for a variety of weirs and flumes, Parshall flumes (ISO),

Right-angle triangle weir, Rectangular weir;

Displays flow rate in L/S or M3/h;

Excellent anti-interference capability;

Clear display with enhanced 14 digit two line backlit LCD;

The cable length between probe and host up to 1000m;

The probe with leak-proof structure and IP68 protect grade;

Chemically resistant probe materials for maximum application flexibility;

Provided 4-20mA output and RS485 serial communication

(MODBUS-RTU) output;

Provided programmable 6 relays at most for alarms;

Three button for programming or remote control for easy configuration

and operation（opt.）;

1.3 Structure

The BUFM660 series O.C.M. consists of a probe and a host. The remote

control is optional.

1.4 Measuring principle: Time-of-flight method

The probe is mounted on the top of the flume, and ultrasonic pulses is

transmitted by the probe to the surface of the monitored material. There,

they are reflected back and received by the pro be. The host measures the

time t between pulse transmission and reception. The host uses the time t (and

the velocity of sound c) to calculate the distance d between the sensor bottom

and the monitored liquid surface: d = c •t/2. As the host knows the installation

height H from parameters setting, it can calculate the level as follows: h = H –

d .

Since speed of sound through air is affected by changes in temperature, the

BUFM660 O.C.M. has integrated a temperature senor to improve accuracy.

For determined flumes, there is a fixed functional relationship between the

instantaneous flow and liquid level. The formula is Q=h (x). Q means

instantaneous flow, h means liquid level in flumes. So the host can calculate

the flow rate though determined flumes and the level value.

It is very important to understanding the working principle for further

installation and operation.

Blind zone: Level echo from the blind zone cannot be evaluated due to the

transient characteristics of the sensor. Span F may not extend into the

blanking distance B.

1.5 Technical data

1.5.1 The host

Type

BUFM660 (host)

Power supply

DC24V (±5%) 0.2A;

AC220V (±20%) 0.1A

Display

2 lines 14 digit backlit LCD

The instantaneous flow rate

range

0.0000~99999L/S or m3/h

The maximum of

cumulative flow

9999999.9 m3

Accuracy of change in level

1mm or 0.2% of measured distance from

the probe at still water. (whichever is

greater)

Resolution

1mm

Analogue output

4-20mA into 500 Ohms, corresponding to

instantaneous flow rate.

Relays outputs

6 multi-function SPDT relays at most

（optional）, rated 5A /250VAC/30VDC,

high, low and failsafe alarm and control

corresponding to instantaneous flow rate or

level.

Serial communication

RS485, MODBUS-RTU standard protocol

Ambient temperature

-40℃~70℃

Temperature compensation

Integral in probe

Pressure range

±0.1MP (press definitely)

Measure cycle

1 second (changeable )

Parameter setting

3 induction buttons / remote control

Cable gland

PG9 /PG11/ PG13.5

Material

ABS

Protect grade

IP67

Fix

Hang

Dimensions

248H*184W*122D(mm)

1.5.2 The probe

Type

BLB-4 (probe)

Range

0.00-4.00m

Blind zone

0.20m

Ambient temperature

-40℃~70℃

Temperature compensation

Integral in probe

Pressure range

0.2MPa

Beam angle

10 (3db)

Cable length

10m standard (can be extended to 1000m)

Material

ABS, PVC or PTFE (optional)

Protect grade

IP68

Fix

Screw (G2) or flange (DN65/DN80/etc.)

2. Installation

Reasonable installation is critical factor of the instrument’s normal working.

Installation must be carried out by trained person in accordance with the manual.

2.1 Installation considerations

2.1.1 hints for the host mounting

The host should not be mounted in a confined space where temperatures

may exceed the normal working temperature (-40~+70), if the host is

mounted outside, it must be protected from direct sunlight or severe

weather conditions.

Ensure that the mounting surface is not subject to vibration and is not in

close proximity to high voltage cables, contactors or drive controls.

Select appropriate knockouts in the base of the enclosure and fit

appropriate cable glands to maintain the IP67 rating.

Do not use excessive force when tightening the fixing and avoid any

distortion of the enclosure.

Pay attentions to the dimensions of the host and the enclosure.

2.1.2 Hints for probe mounting

The probe can be supplied as standard or with a screw nut or with an

ordered flange.

For applications requiring chemical compatibility the probe is available

fully enclosed in PTFE.

The use of metallic fittings or flanges is not recommended.

For exposed or sunny locations a protective hood is recommended.

Make sure that the probe is mounted perpendicular to the monitored

surface and ideally, at least 0.25 meters above it, because the probe

cannot get response in the blind zone.

The probe has a 10 inclusive conical beam angel at 3 db and must be

mounted with a clear unobstructed sight of the liquid to be measured.

But smooth vertical sidewalls weir tank will not cause false signals.

The probe must be mounted upstream of the flume or weir.

Do not over-tighten the bolts on flange.

The stilling well can be used when there is volatility in the water or

needs to improve the accuracy of level measurement. The still well

connect with the bottom of the weir or flume, and the probe measures

the level in the well.

When install to the cold area, should choose the lengthen sensor and

make the sensor extend into the container, shun frost and icing.

For Parshall flume, the probe should be installed in a position the 2/3

contraction away from the throat.

For triangular weir and rectangular weir, the probe should be installed on

the upstream side, the maximum water depths over the weir and 3~4

times away from the weir plate.

Parshall flume

triangular weir

rectangular weir

2.2 Mounting dimensions

The host

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