Aplisens PCE-28.Modbus User manual

USER’S MANUAL
SMART PRESSURE AND
DIFFERENTIAL PRESSURE TRANSMITTERS
PCE-28.MODBUS
PRE-28.MODBUS
EN.IO.PCE.PRE.28.MODBUS
SEPTEMBER 2021
APLISENS S.A., 03-192 Warsaw, Morelowa 7 St.
tel. [phone]; fax [phone]
www.aplisens.com, e-mail: [email protected]
Revision 01.A.001

PRODUCT CODE –see: (➔Transmitter identification).
The QR code or ID number identifies the transmitter and provides quick access to the following documentation
on the manufacturer’s website: user’s manual, explosion-proof device user manual, declarations of conformity
and copies of certificates.
PCE-28.MODBUS
ID: 0032 0001 0001 0000 0000 0000 0001 16
https://www.aplisens.pl/ID/003200010001000000000000000116/
PCE-28.MODBUS (Exi)
ID: 0032 0002 0001 0000 0000 0001 0001 33
https://www.aplisens.pl/ID/003200020001000000000001000133/

PRE-28.MODBUS
ID: 0037 0001 0001 0000 0000 0000 0001 98
https://www.aplisens.pl/ID/003700010001000000000000000198/
PRE-28.MODBUS (Exi)
ID: 0037 0002 0001 0000 0000 0001 0001 18
https://www.aplisens.pl/ID/003700020001000000000001000118/

Symbols used
Symbol
Description
Warning to proceed strictly in accordance with the information contained in the doc-
umentation in order to ensure the safety and full functionality of the device.
Information particularly useful during installation and operation of the device.
Information particularly useful during installation and operation of an Ex type device.
Information on disposal of used equipment.
BASIC REQUIREMENTS AND SAFE USE
The manufacturer will not be liable for damage resulting from incorrect installation,
failure to maintain a suitable technical condition of the device or use of the device
other than for its intended purpose.
Installation should be carried out by qualified staff having therequired authorizations
to install electrical and I&C equipment. The installer is responsible for performing
the installation in accordance with manual as well as with the electromagnetic com-
patibility and safety regulations and standards applicable to the type of installation.
In systems with I&C equipment, in case of leakage, there is a danger to staff due to
the medium under pressure. All safety and protection requirements must be ob-
served during installation, operation and inspections.
If a malfunction occurs, the device should be disconnected and handed over to the
manufacturer for repair.
In order to minimize the risk of malfunction and associated risks to staff, the device
is not to be installed or used in particularly unfavourable conditions, where the fol-
lowing hazards occur:
−possible mechanical impacts, excessive shocks and vibration;
−excessive temperature fluctuation;
−water vapour condensation, dusting, icing.
Changes made to the manufacturing of products may be introduced before the paper version of the
manual is updated. The up-to-date manuals are available on the manufacturer’s website:
www.aplisens.com.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 5
TABLE OF CONTENTS
1. INTRODUCTION ......................................................................................... 7
1.1. Purpose of the document ............................................................................................7
2. SAFETY ...................................................................................................... 7
3. TRANSPORT AND STORAGE ................................................................... 8
3.1. Delivery check.............................................................................................................8
3.2. Transport.....................................................................................................................8
3.3. Storage........................................................................................................................8
4. GUARANTEE.............................................................................................. 8
5. IDENTIFICATION........................................................................................ 9
5.1. Manufacturer’s address...............................................................................................9
5.2. Transmitter identification .............................................................................................9
5.3. CE mark, declaration of conformity .............................................................................9
6. INSTALLATION ........................................................................................ 10
6.1. General recommendations........................................................................................10
6.1.1. Installation instructions for transmitters with distance separators............................10
7. ELECTRICAL CONNECTION ................................................................... 11
7.1. Cable connection to transmitter internal terminals.....................................................11
7.1.1. Connection of transmitters with PKD, PZ, SG, PM12 type connector (cable
connection)........................................................................................................................11
7.2. Transmitter power supply..........................................................................................11
7.2.1. Transmitter supply voltage......................................................................................11
7.2.2. Specifications of electrical switching terminals........................................................12
7.2.3. Connecting of transmitters in the MODBUS network ..............................................12
7.3. Equipotential bonding................................................................................................13
7.4. Overvoltage protection ..............................................................................................14
7.5. Final inspection of cabling.........................................................................................14
8. START-UP ................................................................................................ 14
9. OPERATION ............................................................................................. 15
9.1. MODBUS register layout...........................................................................................15
9.2. Pressure unit codes...................................................................................................16
9.3. Modbus status register description............................................................................16
9.4. Error codes supported by Modbus ............................................................................16
10.MAINTENANCE ........................................................................................ 17
10.1. Periodic inspections ..................................................................................................17
10.2. Non-periodic inspections...........................................................................................17
10.3. Cleaning/washing......................................................................................................17
10.4. Diagram cleaning ......................................................................................................17
10.5. Spare parts................................................................................................................17
10.6. Repair........................................................................................................................17
10.7. Returns......................................................................................................................17
11.SCRAPPING, DISPOSAL ......................................................................... 18
12.HISTORY OF REVISIONS......................................................................... 18
Explosion-proof device manual EN.IX.PCE.PRE.28.MODBUS................... 19

EN.IO.PCE.PRE.28.MODBUS
6Revision 01.A.001/2021.09
LIST OF DRAWINGS
Figure 1. Diagram of connecting the transmitters in the MODBUS network..........................13
LIST OF TABLES
Table 1. Symbols occurring on the transmitter nameplate.......................................................9
Table 2. Connection, output signals. .....................................................................................11
Table 3. Permissible transmitter supply voltages. .................................................................11
Table 4. A binary value assigned to the corresponding pressure unit. ..................................16

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 7
1. INTRODUCTION
1.1. Purpose of the document
The subject of manual are smart pressure transmitters PCE-28.MODBUS, smart differential pressure
transmitters PRE-28.MODBUS hereinafter referred jointly to as the transmitters. The manual ap-
plies to the following versions: standard and intrinsically safe Exi.
The manual contains data, tips and general recommendations for safe installation and operation of the
transmitters, as well as troubleshooting in case of possible failure.
The manual does not cover explosion protection issues.
It is forbidden to use devices in hazardous areas without appropriate permits.
Data on the pressure transmitters PCE-28.Modbus, PRE-28.Modbus in intrinsically
safe version according to ATEX are included in the explosion-proof device manual
marked as EN.IX.PCE.PRE.28.MODBUS
2. SAFETY
−The installation and start-up of the device and any activities related to operation shall be
carried out after thorough examination of the contents of user’s manual and the instruc-
tions related thereto;
−installation and maintenance should be carried out by qualified staff having the required
authorizations to install electrical and measuring devices;
−the device shall be used according to its intended purpose in line with the permissible
parameters specified on the nameplate (➔Transmitter identification);
−the protection elements used by the manufacturer to ensure transmitter safety may be
less effective if thedevice is operated in a mannernot consistent withits intended purpose;
−before installing or disassembling the device, it is absolutely necessary to disconnect it
from the power source;
−no repairs or alterations to the transmitter electronic system are permitted. Assessment of
damages and possible repair may only be performed by the manufacturer or authorized
representative;
−do not use instruments if damaged. In case of malfunction, the device must be put out of
operation.

EN.IO.PCE.PRE.28.MODBUS
8Revision 01.A.001/2021.09
3. TRANSPORT AND STORAGE
3.1. Delivery check
After receiving the delivery, please refer to the general terms and conditions of contracts available
on the manufacturer website: https://aplisens.com/ogolne_warunki_umow.html.
3.2. Transport
Transport of transmitters shall be carried out with the use of covered means of transport, in original
packages with diaphragm provided with protection. The packaging shall be protected against movement
and direct impact of atmospheric factors.
3.3. Storage
Transmitters shall be stored in a factory packaging, in a room without vapours and aggressive sub-
stances, protected against mechanical impact.
Allowable range of storage temperature:
•PCE-28.MODBUS: -40 ... 85°C (-40…185°F);
•PRE-28.MODBUS: -25 ... 80°C (-13…176°F).
Operating temperature range and measured medium for transducers in the Ex version
included in the explosion-proof device manual marked as EN.IX.PCE.PRE.28.Modbus.
4. GUARANTEE
General terms and conditions of guarantee are available on the manufacturer's website:
www.aplisens.com/ogolne_warunki_gwarancji
The guarantee shall be repealed if the device is used against its intended use, failure to
comply with user’s manual or interference with the structure of the device.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 9
5. IDENTIFICATION
5.1. Manufacturer’s address
APLISENS S.A.
03-192 Warsaw
Morelowa 7 St.
Poland
5.2. Transmitter identification
Depending on the version of the transmitter, the nameplates may differ in the amount of information
and parameters.
Table 1. Symbols occurring on the transmitter nameplate.
Logo and name of manufacturer
CE mark
CE mark with the number of notified body
QR code
Transmitter type
Transmitter model ID
Types of measurement input
Supply voltage values
Permissible range of ambient temperature
Output signal
Type of electrical connection
Transmitter serial number
Year of production
IP range value
//lower part of the
nameplate//
Special execution
Note about the read the manual
Manufacturer address
5.3. CE mark, declaration of conformity
The device has been designed to meet the highest safety standards, has been tested and has left the
factory in a condition that is safe for operation. The device complies with the applicable standards and
regulations listed in the EU Declaration of Conformity and has CE marking on nameplate.

EN.IO.PCE.PRE.28.MODBUS
10 Revision 01.A.001/2021.09
6. INSTALLATION
6.1. General recommendations
It is recommended that in case of a gaseous medium, the transmitters should be installed
above the measuring point so that condensate may flow to the point from which the meas-
ured pressure is collected, while in case of liquid medium or steam, it should be installed
below the point of pressure intake.
For low measurement ranges, there may be an influence of transmitter's position and influence of im-
pulse lines position and liquid filling method on output signal. Any possible misalignment of the signal
should be corrected by resetting the transducer after mounting.
6.1.1. Installation instructions for transmitters with distance separators
The protection of the separator diaphragm can only be removed shortly before installation.
Hydrostatic pressure of the manometric liquid column in the transmitter-separator system may cause
incorrect indication of the measured value. After installation, the transmitter must be pressure-reset.
Do not clean or touch separator diaphragms using hard or pointy objects.
Separators with pressure transmitter form a closed, calibrated system filled with gauge
fluid. The opening for filling the device with gauge fluid is sealed and must not be opened.
When choosing a mounting location, it is necessary to ensure sufficient stress relief of the
capillaries tension in order to avoid excessive bending.
Incorrect installation of the sealing may result in incorrect measurement indications.
Special attention must be paid when selecting correct dimensions of the sealing.
As standard, the separators are not provided with the gaskets.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 11
7. ELECTRICAL CONNECTION
7.1. Cable connection to transmitter internal terminals
All connection and installation operations shall be performed with disconnected supply volt-
age and other external voltages, if used.
Failure to provide proper connection of the transmitter may result in danger.
Risk of electric shock and/or ignition in potentially explosive atmospheres.
7.1.1. Connection of transmitters with PKD, PZ, SG, PM12 type connector (cable
connection)
Electrical connections of transmitters equipped with PKD, SG, PM12 type connectors are made
through a terminal box with a gland in which the converter cable connects to the further part of the
signal line. The junction box should have a "breathing" hole that equalizes the pressure inside the box
to the atmospheric pressure.
Table 2. Connection, output signals.
Output of signals
Function
Electrical connection
PM12 (Connector con-
nection)
PKD,SG (Cable connec-
tion)
PZ (Connector connection)
SHIELDED
CABLE
1
Green
-
+
2
Red
1
- (GND)
3
Black
2
RS-485 A +
4
Blue
4
RS-485 B -
5
Yellow
3
7.2. Transmitter power supply
7.2.1. Transmitter supply voltage
Power cables may be live.
There is a risk of electric shock and/or explosion.
Installation of the transmitter in explosion-risk atmospheres must comply with national
standards and regulations.
Table 3. Permissible transmitter supply voltages.
Mode / version
Minimum supply voltage
Maximum supply voltage
MODBUS mode standard version
4 V DC
28 V DC
Analog mode standard version
5 V DC
28 V DC
MODBUS Exi version for PCE-
28.Modbus and PRE-28.MODBUS
4 V DC
10 V DC
MODBUS Exi version for PCE-
28.Modbus16 and PRE-28.MODBUS16
10.5 V DC
15.8 V DC
- current for Modbus mode < 3,6 mA for PCE-28.Modbus and PRE-28.Modbus;
- current for Modbus mode < 23 mA for PCE-28.Modbus16 and PRE-28.Modbus16.

EN.IO.PCE.PRE.28.MODBUS
12 Revision 01.A.001/2021.09
7.2.2. Specifications of electrical switching terminals
Internal electrical switching terminals are suitable for conductors with the cross-section from
0,5 to 2,5 mm2.
7.2.3. Connecting of transmitters in the MODBUS network
The PCE-28 Modbus, PRE-28 Modbus transmitters have two operating modes:
• configuration mode;
• Modbus mode.
The configuration mode is used to change the settings and for detailed diagnostics of the transmitter.
In this mode (in the transmitters manufactured from July 2014 with the software version at least 14 and
the electronics version at least 48), the current loop is also activated, which enables operation with a 4-
20 mA current output.
If the user intends to use the 4-20 mA operating mode, after configuring the parameters with the "Mod-
bus Configurator" program, the transducer should be left in the configuration mode.
Additional settings for the 4-20 mA operating mode beyond the scope of the "Modbus Configurator"
option are possible with the Raport 2 software.
If the user intends to use the Modbus operating mode, after configuring the parameters with the "Mod-
bus Configurator" program, the transducer should be switched to the Modbus mode.
The measuring range for 1/100 integer units with a sign is within the range
from -32767 to 32767 units. Exceeding this range causes a false reading.
In the case of pressure reading in the "Signed 16-bit int" binary format, the basic unit should be selected
in such a way that 100 times the value of the pressure expressed in it doesnot exceed the above range.
At all baud rates (especially at 115200 bps), a 120 Ω matching resistor should be used, which is by
default connected to the transmission system between the "Digital" A and B outputs by means of a
jumper (Aplisens PP Modbus boxes are factory-made equipped with a 120 Ω resistor). When connect-
ing products with the MODBUS RTU output signal, it is convenient to use appropriate junction boxes.
The Aplisens company proposes to use its own boxes marked with PP-Modbus symbols.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 13
Figure 1. Diagram of connecting the transmitters in the MODBUS network.
7.3. Equipotential bonding
In the case of using a cable in the screen, connect the screen on one side at the transmitter’s power
supply point.
The transmitter in intrinsically version should be powered from a galvanically separated power source
or, if this is not possible, equipotential bonding of the transmitter and the power supply device should
be ensured by means of equipotential bonding conductors. In this respect the locally applicable regu-
lations must be observed.

EN.IO.PCE.PRE.28.MODBUS
14 Revision 01.A.001/2021.09
7.4. Overvoltage protection
Transmitters may be exposed to the effect of switching overvoltage’s or those resulting from lightning
discharges. Protection against overvoltage’s between the wires of the transmission line is provided by
TVS diodes installed in all types of transmitters. In order to protect against overvoltage’s between the
transmission line and the ground or housing (which are not protected by diodes connected between the
line wires), additional protection is applied in the form of gas surge arresters. Additionally, an external
protective device can be used, e.g. the UZ-2 system by APLISENS or others.
7.5. Final inspection of cabling
After completing the electrical installation of the transmitter it is necessary to check the following:
−does the supply voltage measured at the transmitter terminals at maximum set current match
the range of supply voltage specified on the transmitter nameplate?;
−Is the transmitter connected according to the information given in section (➔Cable connection
to transmitter internal terminals)?;
−Are all cable mount tightened? (depending on the version);
−Are the cable gland tightened? (depending on the version).
8. START-UP
As standard, the transmitter is adjusted to a set range equal to the base range, unless a specific set
range is provided in the order. The base range and the basic unit of the transmitter can be read out
from its nameplate (➔Transmitter identification).
Description of the communication protocol used in transmitters with Modbus digital output is available
on the manufacturer's website in “Modbus Configurator” manual.
Use the transmitter within acceptable pressure limits. Risk of damage due to part breakage
when the maximum allowable operating pressure is exceeded.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 15
9. OPERATION
9.1. MODBUS register layout Read-only data.
Register
Address
(hex)
Purpose
Notes
Format
Bytes
(2 bytes per register)
1
0x0000
User specific
% of the controlled
set range
IEEE754
4 bytes (2 registers)
3
0x0002
Pressure of sensor 1
Pressure or level
process variable
IEEE754
4 bytes (2 registers)
5
0x0004
Pressure of sensor 2
Constant 0ºC
IEEE754
4 bytes (2 registers)
7
0x0006
Temperature of sensor 1
Sensor 1 tempera-
ture process variable
in ºC
IEEE754
4 bytes (2 registers)
9
0x0008
CPU temperature
CPU temperature
process variable in
ºC
IEEE754
4 bytes (2 registers)
11
0x000A
Temperature of sensor 2
Constant 0ºC
IEEE754
4 bytes (2 registers)
13
0x000C
--------------------------
------------------------
-----------------------
4 bytes (2 registers)
15
0x000E
--------------------------
------------------------
-----------------------
4 bytes (2 registers)
17
0x0010
User specific
1/100% of the con-
trolled set range
Signed 16-bit int
2 bytes (1 register)
18
0x0011
Pressure of sensor 1
Integer, 1/100 of the
pressure or level
unit
Signed 16-bit int
2 bytes (1 register)
19
0x0012
Pressure of sensor 2
Value 0 1/100 of the
selected unit
Signed 16-bit int
2 bytes (1 register)
20
0x0013
Temperature of sensor 1
Integer,
1/100ºC
Signed 16-bit int
2 bytes (1 register)
21
0x0014
CPU temperature
Integer,
1/100ºC
Signed 16-bit int
2 bytes (1 register)
22
0x0015
Temperature of sensor 2
Value 0 1/100 in ºC
Signed 16-bit int
2 bytes (1 register)
23
0x0016
Pressure unit
Pressure or level
unit
Unsigned 16-bit
int
2 bytes (1 register)
See Table 4
24
0x0017
--------------------------
------------------------
-----------------------
2 bytes (1 register)
25
0x0018
Upper sensor limit
Upper limit of the
standard range
IEEE754
4 bytes (2 registers)
27
0x001A
Lower sensor limit
Lower limit of the
standard range
IEEE754
4 bytes (2 registers)
29
0x001C
Damping value
seconds (s)
IEEE754
4 bytes (2 registers)
31
0x001E
Response delay value
milliseconds (ms)
Unsigned 16-bit
int
2 bytes (1 register)
32
0x001F
Modbus address
1…247
Unsigned 8-bit int
2 bytes (1 register)
33
0x0020
Identity register
Unsigned 8-bit int
6 bytes (3 registers)
36
0x0023
Status register
8-bit flags
2 bytes (1 register)
*Grayed out fields are not active in the described version of devices

EN.IO.PCE.PRE.28.MODBUS
16 Revision 01.A.001/2021.09
9.2. Pressure unit codes
Table 4. A binary value assigned to the corresponding pressure unit.
Unit
Value (decimal)
Unit
Value (decimal)
atm
14
mbar
8
bar
7
mmH2O (w 4°C)
239
FtH2O
3
mmH2O
4
g/cm²
9
mH2O (w 4°C)
171
InH2O (w 4°C)
238
mmHg
5
InHg
1
MPa
237
kg/cm²
2
Pa
11
kPa
10
psi
6
mbar
12
torr
13
9.3. Modbus status register description
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
SV,TV,FV out of
limit
PV out of
limit
0
0
0
0
0
9.4. Error codes supported by Modbus
Error
code
Designation
Description
1
Disallowed function code
The error occurs when the function code is unsupported by the de-
vice. Currently the function code with number 3 is implemented -
Read Holding Registers.
2
Disallowed data address
Error occurs for addresses out of the range 0x00 0x23.
3
Incorrect data quantity
Invalid number of read registers declared in frame.
4
Transmitter failure
Hardware fault detected
8
Memory error
A RAM or FLASH error has been detected.

EN.IO.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 17
10. MAINTENANCE
10.1. Periodic inspections
Periodic inspections shall be carried out in accordance with applicable standards. During the inspection,
the condition of the pressure (absence of loosened elements and leaks) and electrical (check of con-
nections reliability and condition of gaskets and glands) connectors, condition of separating diaphragms
(tarnish, corrosion) and stability of fixing of the housing and mounting bracket (if used)shall be checked.
Check the processing characteristics by performing the operations specific for the calibration and pos-
sibly configuration procedure described in EN.IM.PCE.PRE.SG.MODBUS.
10.2. Non-periodic inspections
If the transmitter at the installation site has been exposed to mechanical damage, pressure overload,
hydraulic pulses, overvoltage, deposits, medium crystallization, undercutting of the diaphragm, or in-
correct operation of the transmitter is detected, the device should be inspected. Check the condition of
the diaphragm, clean it, check the electrical functionality of the transmitter and the processing charac-
teristics.
If there is no signal in the transmission line or its value is improper, check the supply line,
connection status on terminal blocks, connectors, etc. Check if the supply voltage and load
resistance are correct.
10.3. Cleaning/washing
To remove impurities from the external surfaces of the transmitter wipe it with a cloth dampened in
water.
10.4. Diagram cleaning
The only possible method of cleaning the transmitter diaphragms is to dissolve the sludge produced.
Do not remove deposits and impurities from the transmitter diaphragms, which are
formed during operation, mechanically using tools, since the diaphragms and the trans-
mitter can be damaged.
10.5. Spare parts
Parts of the transmitter that may be worn or damaged and thus replaced:
−In the transmitter with PKD connection - terminal block with angular cover and gasket;
−In the transmitter with PM12 connection –connector PM12.
−In the transmitter with PKD connection –all connector.
−In the transmitter with PD connection –connector terminal block with angular cover and gasket,
and connector base with gasket.
Other parts in the case of ATEX type of transmitter may be replaced only by the
manufacturer or an authorized representative.
10.6. Repair
Faulty or non-operational transmitter shall be provided to the manufacturer.
10.7. Returns
In the following cases, the transmitter should be returned directly to the manufacturer:
-need for repair;
-need for factory calibration;
-replacement of improperly selected/shipped transmitter.

EN.IO.PCE.PRE.28.MODBUS
18 Revision 01.A.001/2021.09
11. SCRAPPING, DISPOSAL
Worn or damaged devices shall be scrapped in accordance with WEEE Directive
(2012/19/EU) on waste electrical and electronic equipment or returned to the manufacturer.
12. HISTORY OF REVISIONS
Revision
No.
Document revision
Description of changes
-
01.A.001/2021.09
Initial document version. Replaces the revision
1_01.D.011_2020-01.
Change of software, power supply, figures. Editorial changes.
Prepared by DBFD.

EN.IO.PCE.PRE.28.MODBUS
EN.IX.PCE.PRE.28.MODBUS
Revision 01.A.001/2021.09 19
Explosion-proof device manual EN.IX.PCE.PRE.28.MODBUS
PRESSURE/DIFFERENTIAL TRANSMITTERS TYPE:
PCE-28.Modbus, PRE-28.Modbus, PCE-28.Modbus16, PRE-28.Modbus16
INTRINSICALLY SAFE acc. to z ATEX
1. Introduction
Explosion proof device manual EN.IX.PCE.PRE.28.MODBUS only applies to pressure and differential
transmitters PCE-28.Modbus, PRE–28.Modbus. PCE-28.Modbus16, PRE-28.Modbus16 in intrinsically
safe version acc. to ATEX marked as in point 2 and the Ex information in the Product Certificate. During
installation and use of Ex transmitters it is necessary to use user’s manual
EN.IO.PCE.PRE.28.MODBUS with „Explosion-proof device manual EN.IX.PCE.PRE.28.MODBUS”.
2. Using transmitters in hazardous area.
The transmitters are produced in accordance with the requirements of the following standards:
EN 60079-0:2018-09, EN 60079-11:2012, EN 50303:2004
The transmitters with PK, PKM, SG, SGM, PZ connection may operate in areas where there is a risk
of explosion , in accordance with the rating of the explosion protection design:
I M1 Ex ia I Ma
II 1/2G Ex ia IIC T4/T5/T6 Ga/Gb
II 1D Ex ia IIIC T110ºC Da
FTZÚ 18 ATEX 0077X
Transmitters with PKD, PM12 connection are approved only for explosive gaseous atmospheres and
have the markings:
II 1/2G Ex ia IIC T4/T5/T6 Ga/Gb
FTZÚ 18 ATEX 0077X
Transmitters PCE-28.Modbus16, PRE-28.Modbus16 with PZ, PZ2 connection have the markings:
I M1 Ex ia I Ma
II 1/2G Ex ia IIB T4 Ga/Gb
II 1D Ex ia IIIC T110ºC Da
FTZÚ 18 ATEX 0077X
3. Permissible input parameters (based on data from the FTZÚ 18 ATEX 0077X)
For the connection of the power supply line and the RS485 data transmission signal line, use
devices that have the relevant intrinsic safety certificates, whose parameters must not exceed
the permissible input-output parameters given in points a) and b).
The transmitters should be powered from devices with galvanically separated power supply.
If it is not possible to separate the galvanically separated power supply, the transducer or the
metal parts connected to it should be properly grounded, using, for example, a system of
equalization wires or using an equalization connection between the transducer and the minus
of the power barrier.
Transmitters PCE-28.Modbus, PRE-28.Modbus with PK, PKM, PKD, PM12, SG, SGM, PZ
connection.
Minimum transmitters supply voltage 4 V DC.
The transmitter is an intrinsically safe device with protection level "ia" when the power supply
circuit has protection level "ia".a)
a) Permissible input parameters for power supply (red “+”, black “-“)
- for power supply with linear characteristics:
Ui ≤ 10 V, Ii ≤ 0.4 A,

EN.IO.PCE.PRE.28.MODBUS
EN.IX.PCE.PRE.28.MODBUS
20 Revision 01.A.001/2021.09
- for power supply with rectangular and trapezoidal characteristics:
Ui ≤ 5 V, Ii ≤ 0.4 A
b) Permissible input and output parameters for RS485 transmission (blue VA, yellow VB):
Ui ≤ 10 V, Ii ≤ 0.2 A, Uo ≤ 10V*, Io ≤ 0.4 A*
* the output parameters of the transmitters Uo, Io are equal to the output parameters Uo, Io of the power supply
used.
Dependence of temperature class of transmitters on ambient temperature (including temperature of
measured medium) Ta [°C] and sum of power Pi [W] in power supply circuit and in RS485 transmission
circuit is given in Table Z1.
Min. ambient temperature Ta = -40°C (special execution from -50°C).
c) The internal capacitance and inductance of transmitter in the power supply circuit and in the RS485
transmission circuit is: Li= 0 µH, Ci≈ 2.5 µF **
d) The maximum capacitance and inductance that can be connected to the transmitter in the
transmission circuit is for the subgroup:
- IIC Lo= 0.2 mH, Co = 0.5 µF;
- IIB Lo= 0.7 mH, Co = 15 µF;
- IIA and group I Lo= 1.7 mH, Co = 80 µF.
** Consider the cable capacitance and inductance, which for a permanently connected cable are:
Ck = 0,2 nF/m i Lk = 1 µH/m
Transmitter with PK, PKM, PKD, PM12, SG, SGM, PZ connection, input capacitance Cw and induct-
ance Lw with cable parameters:
Cw = Ci + a·Ck = 2.5µF + a·0.2nF/m
Lw= Li + a·Lk = 0µH + a·1µH/m
Where:
a - the length of the cable permanently mounted in the transducer in meters.
Table Z1. Temperature class dependence on ambient temperature Ta and power sum Pi.
Pi [W]
Total input power of
485 power and
transmission
circuits
Ta
[ºC]
Class
temp.
Pi [W]
Total input power of
485 power and
transmission
circuits
Ta
[ºC]
Class
temp.
Pi [W]
Total input power of
485 power and
transmission
circuits
Ta
[ºC]
Class
temp.
0.25
65
T6
0.75
55
T6
1.5
65
T5
80
T5
80
T5
80
T4
0.5
60
T6
1.2
70
T5
1.75
60
T5
80
T5
80
T4
80
T4
PCE/PRE-28.Modbus16 transmitters with PZ, PZ2 connection:
Minimum supply voltage 10,5 V DC.
a) Permissible input parameters for power supply (red+, black-)
- For linear power supply:
Ui≤ 15,8 V, Ii≤ 1.5 A, Li=0 µH, Ci=0 µF
b) Input and output parameters for transmission RS485 (VA, VB)
Ui≤ 10 V, Ii ≤ 0.5 A, Pi=1,6 W, Li=0 µH, Ci=2.5 µF
Uo = 5.88 V, Io = 0.039 A, Po=0.143 W,
For gr. I + IIA Lo=3 mH, Co=80 µF, dla IIB Lo=3 mH, Co=40 µF
4. Connection of transmitters in Ex version
Connections of the transmitters and devices in the transmitters measuring loop must be made in
accordance with intrinsic safety and explosion protection standards and conditions of use in hazardous
areas. Failure to observe the intrinsic safety rules may result in an explosion and resultant danger to
people.