SMERI PLUR Series Bedienungsanleitung

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USER MANUAL

ULTRASONIC LEVEL METER PLUR

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CONTENT

1. Introduction............................................................................................................................. - 3 -

1.1 Application.....................................................................................................................- 3 -

1.2 Features........................................................................................................................ - 3 -

1.3 Structure........................................................................................................................- 3 -

1.4 Measuring principle: Time-of-flight method............................................................. - 4 -

1.5 Technical Data..............................................................................................................- 5 -

2. Installation............................................................................................................................... - 7 -

2.1 Installation Considerations.........................................................................................- 7 -

2.2 Mounting Dimensions................................................................................................. - 8 -

3. Wiring.....................................................................................................................................- 10 -

3.1 The host...................................................................................................................... - 10 -

3.2 Wiring Diagram.......................................................................................................... - 10 -

3.3 The Cable....................................................................................................................- 11 -

4. Operation...............................................................................................................................- 12 -

4.1 Display and Keys.......................................................................................................- 12 -

4.2 Two working mode.................................................................................................... - 12 -

5. Calibration.............................................................................................................................- 20 -

5.1 General consideration.............................................................................................. - 20 -

5.2 Serial communication-Modbus-RTU...................................................................... - 21 -

Address number............................................................................................................... - 21 -

Baud rate........................................................................................................................... - 21 -

Parity Check......................................................................................................................- 21 -

Function code................................................................................................................... - 21 -

Abnormal corresponding.................................................................................................- 22 -

Electrical connection........................................................................................................- 22 -

The RTU mode................................................................................................................. - 22 -

6. Trouble-shooting............................................................................................................... - 25 -

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1. Introduction

1.1 Application

The PLUR series is an enhanced remote ultrasonic level meter for

continuous non-contact level measurement in liquids and solids. It

consists of probe and host, both of which are plastic leak-proof

structure. This series can be widely applied to the metallurgical,

chemical, electricity and oil industries.

1.2 Features

PLUR series is capable of the following functions:

Measuring range up to 40m (in liquid);

Excellent anti-interference capability;

Clear display with Graphical LCD(with backlight) ;

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 PLUR series consists of a probe and a host. The remote control is

optional.

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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

PLUR has integrated a temperature senor to improve accuracy.

An integrated temperature sensor compensates for changes in the velocity of

sound caused by temperature changes. Calibration Enter the empty distance

H and the span F to calibrate the device.

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.

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1.5 Technical Data

1.5.1 The host

Type

Power supply

DC24V (±5%) 0.2A;

AC220V (±20%) 0.1A

Display

Graphical LCD

Resolution

1mm

Analogue output

4-20mA

Relays outputs

6 multi-function SPDT relays at most

（optional）, rated 5A /250VAC/30VDC,

high, low and failsafe alarm and control

corresponding to level or distance values .

Serial communication

RS485, MODBUS-RTU standard protocol

Ambient temperature

-20℃~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)

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1.5.2 The probe

L-4、L-6、L-8 Technical data

Measuring range

L-4:0-4m blacking

distance:20cm

L-6:0-6m blacking

distance:25cm

L-8:0-8m blacking

distance:30cm

Temperature

range

-40℃~80℃

Pressure range

±0.1MP (press definitely)

Beam angle

8°（3db）

Material

ABS/PVC/PTFE

Protect grade

IP68

The length of cable

10m(standard)

Fix

Flange /screw

L-12 L-20、L-30、L-40 Technical data

Measuring range

L-12:0-12m blacking

distance:50cm

L-20:0-20m blacking

distance:80cm

L-30:0-30m blacking

distance:100cm

L-40:0-40m blacking

distance:120cm

Temperature

range

-40℃~80℃

Pressure range

±0.1MP (press definitely)

Beam angle

5°（3db）

Material

ABS/PVC/PTFE

Protect grade

IP68

The length of

cable

10m(standard)

Fix

Flange/screw

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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 (-20~+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.

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2.2 Mounting Dimensions

The host

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The probe

4m、6m、8m

12m 20m、30m、40m

The remote control

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3. Wiring

The PLUR series has one LCD show and three keys for setting and some

terminal blocks, which are located within the host housing and can be

operated when the terminal cover is open.

3.1 The host

3.2 Wiring Diagram

Remove the terminal cover to expose the terminals shown below. The

wiring instructions are on bottom of the terminals as below.

DC24V power supply

LCD shown

Keys

Termina

Remote Control

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