Instruction
Manual
Wideband Zener
Barrier
Types
5252A1 and 5252A2
ä
5252A_002-771e-08.21
Foreword
Foreword
5252A_002-771e-08.21
Thank you for choosing a Kistler quality product characterized
by technical innovation, precision and long life.
Information in this document is subject to change without notice.
Kistler reserves the right to change or improve its products and
make changes to the content without obligation to notify any
person or organization of such changes or improvements.
© 2016 ... 2021 Kistler Group. All rights reserved. Except as
expressly provided herein, no part of this manual may be repro-
duced for any purpose without the express prior written consent
of Kistler Group.
Kistler Group products are protected by various intellectual
property rights. For more details visit www.kistler.com. The Kis-
tler Group includes Kistler Holding AG and all its subsidiaries in
Europe, Asia, the Americas and Australia.
Kistler Group
Eulachstrasse 22
8408 Winterthur
Switzerland
Tel. +41 52 224 11 11
info@kistler.com
www.kistler.com
Page 1
5252A_002-771e-08.21Page 2
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Content
Total pages: 22
1. Introduction .......................................................................................................................................3
2. Important Information ......................................................................................................................4
2.1 For Your Safety.......................................................................................................................4
2.2 Precautions ............................................................................................................................5
2.3 Disposal of Electronic Equipment...........................................................................................5
2.4 Hazardous Area Certications ................................................................................................6
2.5 Electromagnetic Compatibility ................................................................................................7
2.6 Product Types ........................................................................................................................7
3. Product Description .........................................................................................................................8
3.1 Wideband Zener Barrier (WZB) and Measurands ..................................................................8
3.2 Wideband Zener Part Number Conguration .........................................................................8
3.3 Wideband Zener Barrier Type 5252A1 or 5252A2 .................................................................9
4. Hazardous and Non-Hazardous Area Installation .......................................................................10
4.1 Typical Applications ..............................................................................................................10
4.2 Special Conditions for Safe Use...........................................................................................14
5. Mounting, Installation & Operation ...............................................................................................15
5.1 Mounting the Wideband Zener Barrier .................................................................................15
5.1.1 Operation ................................................................................................................15
5.1.2 Fuse Operation .......................................................................................................16
5.1.3 Frequency Response of Wideband Zener Barrier ..................................................16
6. Application Example ......................................................................................................................17
7. Calibration & Maintenance ............................................................................................................18
7.1 General.................................................................................................................................18
7.2 Care & Cleaning ...................................................................................................................18
8. Storage & Transit Considerations.................................................................................................19
9. Warranty ..........................................................................................................................................20
10. Hazardous Area Documents ........................................................................................................21
Page 35252A_002-771e-08.21
Introduction
Thank you for choosing a quality product from Kistler. Please
read through this manual thoroughly to enable you to fully
utilize the various features of this product.
To the extent permitted by law Kistler accepts no liability if
this instruction manual is not followed, or if products other
than those listed under Accessories are used.
These instructions describe the Wideband Zener Barrier as
an Intrinsic Safety Barrier for signals in Hazardous Areas.
Performance features at a glance:
12 V and 24 V options
Wide frequency bandwidth of up to 1 MHz
Maximum current of up to 50 mA
Insensitive to electric and magnetic noise elds
Wide operating temperature range: –40 ... 70 °C
[–40 ... 158 °F]
Conforming to ä
For Acoustic Emissions Applications
For Pressure Measurement Applications
For Serial Bus Applications
For Compressor Speed Applications
Kistler oers a wide range of products for use in measuring
technology:
Piezoelectric sensors for measuring force, torque, strain,
pressure, acceleration, shock, vibration and acoustic
emission
Strain gage sensor systems for measuring force and
torque
Piezoresistive pressure sensors and transmitters
Signal conditioners, indicators and calibrators
Electronic control and monitoring systems, as well as
software for specic measurement applications
Data transmission modules (telemetry)
Kistler also develops and produces measuring solutions
for the application elds engines, vehicles, manufacturing,
plastics and biomechanics sectors.
Our product and application brochures, in addition to our
detailed data sheets, will provide you with an overview of our
product range. All unit measurements provided are listed in
order of metric units, followed by imperial units [in brackets].
If you require additional assistance beyond what can be loca-
ted online or in this manual, please contact Kistler‘s extensive
support organization or visit us online at www.kistler.com.
1. Introduction
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 4
2. Important Information
The instruments are CE-compliant within the meaning of EU
Directive 2004/108/EC and conform to the EMC standard
EN 61326-1:2013; compliance is required with the correspon-
ding installation notes. All equipment is tested and has left
the factory in a perfect, safe condition. In order to maintain
this condition and ensure safe operation, compliance is requi-
red with the instructions and warning notes contained within
this manual or imprinted on the product itself.
Compliance with local safety regulations, which may apply
to the use of power line operated electrical and electronic
equipment, is strongly recommended.
It is essential for you to review the following information,
which is intended to ensure your personal safety when
working with the acoustic emission sensors and contribute
toward a longer service life.
2.1 For Your Safety
5252A_002-771e-08.21
Important Information
Page 5
2.3 Disposal of Electronic Equipment
2.2 Precautions
Compliance with the following precautionary measures is
vital to ensure safe and reliable operation:
Check all equipment packaging for transporation damage.
Report any damage to the transporter and to Kistler.
The equipment should be used only under the specied ope-
rating conditions and must be protected against excessive
dust and mechanical stress (shock, vibration, etc.).
Avoid high atmospheric humidity, which can lead to conden-
sation during changes in temperature.
If there is evidence that safe operation is no longer possib-
le, the instrument must be powered o and rendered safe
against accidental start-up. Safe operation is no longer pos-
sible when the product
▪ shows visible signs of damage
▪ is no longer operating
▪ has been subjected to prolonged storage under unsuitable
conditions
Do not discard old electronic equipment in municipal trash.
For disposal at end of life, please return this product to the
nearest authorized electronic waste disposal service or
contact your Kistler sales oce for disposal instructions.
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 6
2.4 Hazardous Area Certications
For Types 5252A1 and 5252A2:
Zone 0:
KISTLER
S/N XXXXXXX/20XX Serial number & date of manufacture
ä II (1) GD [Ex ia Ga] IIC (-40˚C≤ Ta ≤+70˚C)
0598 [Ex ia Da] IIIC (-40˚C≤ Ta ≤+70˚C)
Baseefa15ATEX0115
IECEx BAS 15.0081
For Type 5252A1:
15.70042609
C US
[Ex ia IIC Ga] Class I, Zone 0: [AEx ia IIC Ga] (-40˚C≤ Ta
≤+70˚C)
[Ex ia IIIC Da] Class II, Zone 20: [AEx ia IIIC Da]
Uo = 13.7 V Ci = 0
Io = 102.3 mA Li = 0
Po = 351 mW Um = 253 V
INSTALL PER CONTROL DOC. 100.247.940
For Type 5252A2:
15.70042609
C US
[Ex ia IIC Ga] Class I, Zone 0: [AEx ia IIC Ga] (-40˚C≤ Ta
≤+70˚C)
[Ex ia IIIC Da] Class II, Zone 20: [AEx ia IIIC Da]
Uo = 27.35 V Ci = 0
I0 = 118 mA Li = 0
Po = 801 mW Um = 253 V
INSTALL PER CONTROL DOC. 100.247.940
Consult the Declaration of Conformity and CSA Control
Drawing, 100.247.940, included in Section 10 of this
Instruction Manual for specic instructions related to Zone 0
and Zone 2 Certication.
Safety barriers are required for all intrinsically safe, Zone 0,
installations of sensors. Each Zone 0 installation of the output
signals in use, in addition to the power, must be protected by
an intrinsically safe barrier.
5252A_002-771e-08.21
Important Information
Page 7
Fig. 1: Types 5252A1 or 5252A2 Wideband Zener Barrier
Type 5252A2 is an intrinsically safe barrier that can be used
when coupling with the 426(X)A… Piezoresistive Pressure
Transmitter and a Data Acquisition System.
Consult the EC Type Examination Certicate
Baseefa12ATEX0138X and CSA Certicate of Compliance
2605764, included in Section 10 of this instruction manual for
specic instructions related to the Zone 2 Certication.
2.5 Electromagnetic Compatibility
The Type 5252A… Zener Barrier meets the EMC regulations:
EN 61326-1:2013.
Connections in explosive environments and dierences in
ground potential when connecting the cable can produce
sparking.
With normal coaxial connections, as used with most
piezoelectric sensors, the shield utilizes a signal return lead
with connections over long distances. Therefore, dierent
ground potentials can produce equalizing currents in the
cable shield. In this case, it may be necessary to forgo
grounding at both ends to prevent ground loops. Using an
additional equipotential bonded lead, with a suciently
large cross-sectional area and the lowest possible internal
resistance, may also provide a solution.
2.6 Product Types
This instruction manual summarizes the use of the following
products:
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 8
3. Product Description
3.1 Wideband Zener Barrier (WZB) and Measurands
The Wideband Zener Barrier (WZB) is an intrinsically safe
barrier that clamps the voltage above the threshold voltage
of the Zener diodes inside the barrier, while allowing high
frequencies of over 1 MHz to pass through the barrier
without attenuation. There are two barrier options: One (Type
5252A1) is a 11.8 V pass, 13.7 V clamp barrier, while the other
(Type 5252A2) is a 24 V pass, 27.35 V clamp. The Wideband
Zener Barrier protects the units in the hazardous area from
unwanted electrical currents and voltages originating in the
safe area, which eliminates the possibility of explosions of
gases in the Hazardous area.
3.2 Wideband Zener Part Number Conguration
The type number is decoded as follows:
5252A_002-771e-08.21
Product Description
Page 9
3.3 Wideband Zener Barrier Type 5252A1 or 5252A2
Fig. 2: Wideband Zener Barrier Outline Drawing
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 10
4. Hazardous and Non-Hazardous Area Installation
Fig. 3: Typical Setup for the Type 5252A1 as a Barrier
Between Hazardous and Safe Areas
4.1 Typical Applications
Type 5252A1 or 5252A2 is installed at the boundary of the
Safe area and the Hazardous area. See the gure below
which shows a typical set-up of the Type 5252A1 Wideband
Zener Barrier residing at the boundary of the Hazardous
and Safe area, Type 8152XXXXXX1 Piezotron Acoustic
Emissions Sensor residing in the Hazardous area and the
Type 5125C2 or 5125C3 AE Coupler residing in the Safe
area.
WARNING: Only ATEX Sensors Type 8152C... with serial
number SN 4944583 and higher are compatible with the Type
5252A1 Wideband Zener Barrier.
5125C2 or 5125C3 AE Coupler
5252A_002-771e-08.21
Hazardous and Non-Hazardous Area Installation
Page 11
See the gure below, which shows a typical setup of the Type
5252A2 Wideband Zener Barrier residing at the boundary of
the hazardous and safe area, Type 426(X)AC… Piezotron®
Pressure Transmitter residing in the Hazardous area, and a
Data Acquisition System or Sensor Interface residing in the
Safe area.
Fig. 4: Typical Type 5252A2 Usage in Piezoresistive
Pressure Transmitter System with 4 ... 20 mA Output
Fig. 5: Typical Type 5252A2 Usage in Piezoresistive
Pressure Transmitter System with 3 Wire Voltage
Output
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 12
See the gures below which show a typical set-up of
the Type 5252A2 and 5252A1 Wideband Zener Barriers
residing at the boundary of the Hazardous and Safe area,
Type 426(X)A… Piezoresistive Pressure Transmitter residing
in the Hazardous area and a Data Acquisition System or
Sensor Interface residing in the Safe area.
Fig. 6: Typical Type 5252A1 and 5252A2 Usage in
Piezoresistive Pressure Transmitter System with 4
wire voltage output
Fig. 7: Typical Type 5252A1 Usage in Piezoresistive
Prressure Transmitter System with Millivolt 4 Wire
Voltage Output
5252A_002-771e-08.21
Hazardous and Non-Hazardous Area Installation
Page 13
Below shows a gure of Types 5252A1 and 5252A2 Wideband
Zener Barriers in a typical system. The entity parameters of
the Intrinsically Safe (IS) sensor inside the Hazardous Area
must be compatible with the entity parameters of the barrier.
For the Type 5252A1 barrier, the entity parameters of the IS
sensor must be rated such that Uo > 13.7 V, Io > 102.3 mA
and Po > 351 mW. For the Type 5252A2 barrier, the entity
parameters of the IS Sensor must be rated such that Uo >
27.35 V, Io > 118 mA and Po > 801 mW.
Fig. 8: Typical Type 5252A1 and 5252A2 Usage in Other
Systems
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 14
4.2 Special Conditions for Safe Use
Wiring to the Barrier terminals must only be performed when
explosive (hazardous) gases and dust are not present.
Installation in NEC- or CSA- dened Class 1, Zone 2 areas
must be done using cabling recognized as NEC type PLTC,
or CEC Type TC, within cable trays as dened in NEC Article
725 or CEC Appendix B, Paragraph 18-152, respectively.
NEC Type ITC may also be used, when housed in a cable
tray. Cable of Types PLTC-ER and ITC-ER may be used for
exposed runs, when properly supported according to NEC
Article 725 and 727.4, respectively.
Mounting, Installation & Operation
5252A_002-771e-08.21 Page 15
5. Mounting, Installation & Operation
5.1 Mounting the Wideband Zener Barrier
The Wideband Zener Barrier is secured to a DIN rail using a
snap-in spring mounting system and can be removed with a
at head screw driver by inserting the screw driver head in
steel tab on the DIN rail side and pulling or prying to overco-
me the spring’s force.
Pin-outs of the Wideband Zener Barrier:
Pin Description Designation
SAFE
1
Screw terminal accepts up to
#14 AWG wire GROUND
SAFE
2
Screw terminal accepts up to
#14 AWG wire SIGNAL OUTPUT
HAZ
3
Screw terminal accepts up to
#14 AWG wire SIGNAL INPUT
HAZ
4
Screw terminal accepts up to
#14 AWG wire GROUND
#6-32
SCREW
TERMINAL
Ground lug for instrinsically safe
ground inside hazard area. Use
#12 AWG wire and ring terminal
GROUND
The barrier should be connected into the circuit while it is
unpowered. The voltage through the barrier under normal
operation should not exceed the rated Uo voltage. DC volta-
ges and AC voltages of up to 1 MHz pass through the barrier
without attenuation. Any voltage above the rated voltage is
clamped to the rated voltage until the current exceeds 50 mA
at which time an internal fuse is blown. Resistors are inclu-
ded in the device to limit the available current in the Hazar-
dous area. The device protects the Hazardous area from high
voltages and currents which may cause sparks. The barrier
must be connected using the proper wires, wire gauge and
codes as shown in the drawing in Section 10.
5.1.1 Operation
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 16
5.1.2 Fuse Operation
There is a fuse inside the Type 5252A1 and Type 5252A2
Wideband Zener Barrier that is rated for 50 mA. If the current
at the input to output exceeds 50 mA by an Input or Output
short, the fuse will be blown. Since the fuse is underneath
the epoxy, if it is ever blown the Wideband Zener Barrier will
need to be completely replaced. It cannot be xed and the
fuse cannot be replaced.
Types 5252A1 and 5252A2 frequency response are shown
below. Notice that it is at up until ~1 MHz.
5.1.3 Frequency Response of Wideband Zener Barrier
Fig. 10: Typical Wideband Zener Barrier Frequency
Response
Frequency (KHz)
Normalized Voltage (peak-to-peak)
Types
5252A_002-771e-08.21
Application Example
Page 17
An example of using the Wideband Zener Barrier is the
AE Sensor measuring chain. The AE-sensor is particularly
suitable for measuring acoustic emissions above 50 kHz in
the surface of machine structures. These sound emissions
(AE) occur, for example, during plastic deformation of mate-
rials, crack formation and propagation, fracture or friction.
Examples of applications are petrochemical processing, tool
and machine monitoring in manufacturing activities involving
cutting, separation and forming. Due to its rugged construc-
tion and leak-tight welded case, the Type 8152C… sensor
is ideal for use in harsh industrial environments. Used in
conjunction with the Type 5252A1 or 5252A2 Zener Barrier
and the Type 5125C2 or 5125C3 AE-coupler, the AE-sensor
is a particularly ideal measuring chain for industrial applica-
tions.
For operation in hazardous environments, the hazardous
area certicates must be consulted for specic usage instruc-
tions of Types 8152C…, 5252A… and 5125C...
6. Application Example
5252A_002-771e-08.21
Wideband Zener Barrier ATEX/CSA Hazardous Area System
Page 18
Types 5252A1 and Type 5252A2 do not require calibration.
7. Calibration & Maintenance
7.1 General
7.2 Care & Cleaning
In general, dust or foreign material should be cleaned from
the enclosure using a soft brush or a clean, dry dust cloth.
Grease or other stubborn dirt may be removed using a cloth
moistened with soapy water or a general-purpose aqueous
detergent cleaner, such as 409™. Solvents should not be
used, as they may harm the painted nish.
Never open the cover of the enclosure while power is applied
to the system due to the danger of explosion. Never connect
or disconnect the wires inside the enclosure with power
applied. Always assume that the hazardous atmosphere is
present.
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