Schmidt SS 20.600 E Series Manuale utente

SCHMIDT®Flow Sensor

SS 20.600 Ex

- Supplementary instructions for use

in explosive atmospheres ATEX

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 2

SCHMIDT®Flow Sensor

SS 20.600 Ex –ATEX version

Table of Contents

1Important information.......................................................................3

2Storage and transport......................................................................4

3Safety instructions for explosive atmospheres................................5

4Application range.............................................................................6

5Mounting instructions.......................................................................7

6Electrical connection and protective sleeve assembly....................9

7Type plate - Labelling....................................................................11

8Declarations of conformity.............................................................12

9Type Examination Certificate ........................................................13

Imprint:

Version: 535698.02B

Subject to modifications

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 3

1 Important information

The present instructions for use contain all ATEX specific information for

fast commissioning and safe operation of the version of SCHMIDT®Flow

Sensor SS 20.600 Ex suitable for ATEX:

Please also read the "Instructions for Use SS 20.600" (material no.:

535084.02), because the present instructions for use are supplemen-

tary instructions for use in explosive atmospheres.

These instructions for use must be read completely and observed care-

fully, before putting the unit into operation.

Any claims under the manufacturer's liability for damage resulting from

non-observance or non-compliance with these instructions will become

void.

Tampering with the device in any way whatsoever - with the exception

of the designated use and the operations described in these instruc-

tions for use - will forfeit any warranty and exclude any liability.

The unit is designed exclusively for the use described below (refer to

chapter 4). In particular, it is not designed for direct or indirect protec-

tion of personal or machinery.

SCHMIDT Technology cannot give any warranty as to its suitability for

a certain purpose and cannot be held liable for accidental or sequential

damage in connection with the delivery, performance or use of this unit.

Other instructions for assembly, commissioning, maintenance and disas-

sembly can be found in the general instructions for use (material no.:

535084.02) of the SCHMIDT®Flow Sensor SS 20.600.

Symbols used in this manual

The symbols used in this manual are explained in the following section.

Danger warnings and safety instructions - Read carefully!

Non-observance of these instructions may lead to injury of the

personnel or malfunction of the device.

Risk of explosion - Read carefully!

Important instructions for use in areas subject to explosion haz-

ards.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 4

2 Storage and transport

Packaging

The device is protected by its packaging. The packaging is environmen-

tally safe and recyclable. Basically, the following materials are used:

cardboard box

polyethylene foam or polyethylene film

Dispose of the available packaging parts by submitting it to a recycling

company.

Conditions for storage and transport

The following points must be observed to avoid damage:

Do not expose the device to excessive mechanical load, such as throw-

ing, stacking, falling etc..

Do not use the device in areas with high humidity or rain.

Do not expose the device to direct sun radiation for a long time.

Before transport or shipment of the sensor, the delivered protective cap

must be placed onto the sensor tip.

The storage temperature must not be lower than -20 °C or higher than

+85 °C.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 5

3 Safety instructions for explosive

atmospheres

The following standards and rules are relevant:

o EN 1127-1: Explosion prevention and protection –Part 1:

Basic concepts and methodology

o TRBS series

o Standards for explosive gas atmospheres ("G"):

- EN 60079-10-1: Classification of explosive atmospheres

- EN 60079-14: Electrical apparatus for explosive atmospheres

- EN 60079-17: Inspection and maintenance

The ATEX version of the SCHMIDT®Flow Sensor SS 20.600

Ex is suitable for the following applications:

o in explosive gas atmospheres: Zone 2

The compliance with the important explosion protection data

of your application must be ensured by appropriate labeling.

o G = Gas

o Device categories 1, 2, 3 in 3 zones

o Gas values: Temperature class (T1 …T6)

Prior to carrying out operations such as assembly or electrical

connection, make sure that:

o the operation approval of the owner is available

o there is no explosive atmosphere

o the device is disconnected from the mains

o the device cannot be switched on inadvertently

Avoid dust deposits (installation position, protection, cleaning

measures…) in order to prevent dangerous increase of the

surface temperature.

Installation, commissioning and periodic checks must be car-

ried out by qualified personnel only ("qualified person“ accord-

ing to TRBS, Technical Rules for Operational Safety, 1203).

Repair work must be carried out by the manufacturer only.

Changes to the device are not allowed and can cause the risk

of explosion (ignition).

Only original accessories by the manufacturer must be used.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 6

4 Application range

The ATEX version of the SCHMIDT®Flow Sensor SS 20.600 Ex (cate-

gory 3) is designed for stationary measurement of the flow velocity as well

as the air and gas temperature in potentially explosive atmospheres with

the following types of protection for:

Gases (Zone 2) : II 3G Ex nA ic IIC T4 Gc

Special condition for use ("X"):

o The internal intrinsically safe circuit is isolated

from the

housing up to 30 V.

o A power supply according to protection class III is required

(SELV or PELV).

The permissible operating temperatures are:

o Electronics : -20 ... +70 °C

o Sensor probe : -40 ... +120 °C

Electrical datas:

o Rated voltage : 24 VDC ± 20 %

o Rated current: ≤250 mA

o Measurement outputs: 0 … 10 V / 4 … 20 mA

o Impulse output: f = 0 … 100 Hz

Umax = 28,8 VDC

Imax = 100 mA

o Relais output: f = 0 … 100 Hz

Umax = 30 VDC

Imax = 50 mA

Enclosure:

o Degree of protecion: IP65(mainenclosure), IP67(sensor probe)

More technical data are given in the general "Instructions for Use

SS 20.600" (material no.: 535084.02).

ESD protection via in-house varistor installed between GND and housing.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 7

5 Mounting instructions

Prior to the assembly in explosive atmospheres, the following safety

measures must be observed:

Check if the device category corresponds to the specified

zones.

Check if the operation approval of the operator is available.

Check if there is an explosive atmosphere during assembly,

maintenance, etc.

Compliance with the applicable regulations and the entire

relevant documentation for this device.

ATEX-relevant operating conditions

Pressure-tight accessories

Only use suitable, pressure-tight accessories if media separation

is required.

Observe the pressure safety measures.

Opening the housing

It is not allowed to open the housing (sealed housing screws).

Unauthorized opening of the housing renders the explosion pro-

tection null and void!

Remote version

The connecting cable between the sensor and the housing in-

cludes intrinsically safe circuits. It is already connected ex works

and must not be disconnected or modified in any way.

Mounting ground or equipotential bonding conductor

The metallic enclosure of the sensor must be connected to grounding or

equipotential bonding according to EN 60079-0.

The cable required for this must be fastened at the terminal screw of the

enclosure, for the remote version also at the sensor.

In general the following applies to grounding:

The external ground connection on the enclosure must be con-

nected to the equipotential bonding of the hazardous area with

low resistance.

No equipotential current must flow between the hazardous

area and non-hazardous area.

Minimum cable cross-section: 1 x 4 mm2

The screw must be tightened firmly at the terminal so that the

conductor cannot be loosened or twisted.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 8

Figure 5-1 Grounding contacts (red), remote version

Figure 5-2 Grounding contacts (red), compact sensor

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEX Page 9

6 Electrical connection and protective sleeve

assembly

The electrical connection is realized by means of special connecting ca-

bles only available at SCHMIDT Technology that can be purchased as

additional optional accessory :

Material numbers : 524921 or 524942

Connecting cable

The sensor must be operated only with the original connecting

cable by SCHMIDT Technology (optional accessory). Other-

wise, the ATEX compliance is null and void.

Other electrical accessories, such as Zener barriers or intrinsically safe

power supplies, are not required for ATEX operation.

In general the following applies:

Make sure that no operating voltage is active during electrical

installation and that the operating voltage cannot be switched on

inadvertently.

This applies in particular to disassembly of the sensor.

WARNING!

DO NOT DISCONNECT THE CONNECTING CABLE FROM

THE SENSOR UNDER VOLTAGE!

WARNING!

DO NOT OPEN PROTECTIVE SLEEVE UNDER VOLTAGE!

It is recommended to connect, first, the connecting cable on the field side

(first, connect the protective sleeve to the cable, see the following descrip-

tion).

The connection on the sensor side is realized by means of a plug-in con-

nector to be mounted subsequently, it must be protected against im-

pacts and UV radiation by means of a protective sleeve with cable entry

(1 x M12) included in the delivery (for assembly procedure refer to Figure

6-1).

Protective sleeve for plug-in connector

Must be mounted!

Without proper installation of the protective sleeve, the explosion

protection becomes invalid!

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 10

Figure 6-1 Assembly of the connecting cable with protective sleeve

(1)

Cable bushing

Protective sleeve

Sensor plug

Fastening screw of

protective sleeve

(with circlip)

Nut of cable

bushing

(M12, 7 Nm)

(2)

(3)

(4)

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