Schmidt SS 20.600 E Series User manual

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:
Copyright 2021 SCHMIDT Technology GmbH
All rights reserved
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
1
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).
1
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)

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 11
Assembly (see Figure 6-1):
(1) Insert the open end of the connecting cable into the protective sleeve
(unscrew the screw of the cable bushing), push sleeve right up to the
cable connector.
(2) Insert the cable connector into the plug of the sensor housing and
tighten the spigot nut manually.
(3) Put the protective sleeve on the plug-in connector and fasten it by
means of the enclosed screws (hexagon sockets 2.5 mm; do not for-
get the snap rings) on the housing.
(4) Tighten the nut of the cable bushing (M12, 7 Nm).
7 Type plate - Labelling
The type plate for labelling according to the standards is fixed at the sen-
sor by means of a wire loop.
If required, the customer can attach this plate at another place as long as
its subject (the sensor) can be identified clearly and it is legible and unde-
tachable.
Examples are:
Mounting it directly at the sensor, e.g. by means of machine
screws through the fixing hole.
Attaching on the adjacent wall next to the sensor or similar ac-
cording to EN 60079-0, chapter 29.6.
The side with the warning note
"Do not disconnect under voltage"
must remain visible.

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 12
8 Declarations of conformity
SCHMIDT Technology GmbH herewith declares in its sole responsibility,
that the product
SCHMIDTFlow Sensor SS 20.600
Part-No. 524 600 (configuration code: A B C D E F 2 H PP)
is in compliance with the appropriate
European guidelines and standards
and
UK statutory requirements and designated standards.
The corresponding declarations of conformity can be download from
SCHMIDT®homepage:
www.schmidt-sensors.com
www.schmidttechnology.de

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 13
9 Type Examination Certificate

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 14

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 15

SS 20.600 Ex –Supplementary instructions for use in explosive atmospheres ATEXPage 16
SCHMIDT Technology GmbH
Feldbergstrasse 1
78112 St. Georgen
Germany
Phone [phone] / 899-0
Fax [phone] / 899-101
Email [e-mail]
URL www.schmidt-sensors.com
www.schmidttechnology.de