E+E Elektronik EE355 User manual

BA_EE355_e // V1.3 // technical data are subject to change
Manual
EE355
Dew Point Transmitter
down to -60 °C Td

E+E Elektronik® Ges.m.b.H. doesn’t accept warranty and liability claims neither upon this publication nor in case of
improper treatment of the described products.
The document may contain technical inaccuracies and typographical errors. The content will be revised on a regular
basis. These changes will be implemented in later versions. The described products can be improved and changed
at any time without prior notice.
USA
FCC notice:
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the installation manual, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CANADIAN
ICES-003 Issue 5:
CAN ICES-3 B / NMB-3 B

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Manual EE355 Dew point transmitter
TABLE OF CONTENT
1 General .................................................................................................................................................4
1.1 SymbolClarication.......................................................................................................................................4
1.2 Safety Instructions.........................................................................................................................................4
1.2.1 Intended Use........................................................................................................................................................4
1.2.2 Installation, start up and control ...........................................................................................................................5
1.3 Environmental aspects ..................................................................................................................................6
2 Product description ............................................................................................................................6
2.1 General..........................................................................................................................................................6
2.2 Dimensions in mm (inch)...............................................................................................................................6
2.3 Autocalibration...............................................................................................................................................7
2.4 Measurement range and Accuracy................................................................................................................7
3 Installation ...........................................................................................................................................7
3.1 Installation location........................................................................................................................................7
3.2 Installing directly into the process .................................................................................................................8
3.3 Installing the probe in a sampling system .....................................................................................................8
3.3.1 Basic sampling cell...............................................................................................................................................9
3.3.2 Sampling cell with quick connector ......................................................................................................................9
4 Electrical Connection........................................................................................................................10
4.1 Connecting cable - Accessory HA0108xx ...................................................................................................10
5 Setup and Adjustment ......................................................................................................................10
5.1 Dew point adjustment by the user ...............................................................................................................10
6 Modbus RTU ...................................................................................................................................... 11
6.1 Data Transmission.......................................................................................................................................11
6.2 Modbus Map................................................................................................................................................11
7 Maintenance.......................................................................................................................................12
7.1 Filter replacement........................................................................................................................................12
7.2 Sensor cleaning...........................................................................................................................................12
8 Accessories .......................................................................................................................................13
8.1 Scope of Supply ..........................................................................................................................................13
9 Technical Data ...................................................................................................................................13

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Manual EE355 Dew point transmitter
1 General
This manual is a part of the scope of supply and serves to ensure optimal operation and function-
ing of the equipment.
For this reason, the manual must be read before start-up.
Furthermore, it is necessary that this manual is read and understood by those responsible for the
handling, installation, and maintenance of the equipment.
This manual may not be used for competitive purposes or passed on to third parties
without the written consent of E+E Elektronik® Ges.m.b.H.
It is permitted to make copies for personal use.
All information, technical data and illustrations contained in these instructions are based on
information available at the time of publication.
1.1 Symbol Clarication
This symbol indicates safety instructions.
The safety instructions have to be carried out unconditionally. If disregarded loss, injury, or dam-
agemaybeinictedtopeopleorproperty.InanycaseE+EElektronik®Ges.m.b.H.cannotbe
hold responsible.
This symbol indicates attention.
The note should be observed to achieve an optimal functioning of the equipment.
1.2 Safety Instructions
1.2.1 Intended Use
The dew point transmitter is intended to be used for the measurement of air (compressed air) and
othernon-corrosiveandnon-ameablegassesonly.
The EE355 can be installed in a pressurized system up to 80 bar (1160 psi).
Mounting, electrical installation, putting into operation and maintenance should be done by quali-
edpersonnelonly.
The use of the EE355 in any other way than described in this manual bears a safety risk for peo-
ple and the entire measurement installation and is therefore not allowed.
The manufacturer cannot be hold responsible for damages as a result of incorrect handling,
installation, and maintenance of the equipment.
To avoid health risks or damage to the equipment, the installation should not be operated on with
tools,whicharenotspecicallymentionedordescribedinthismanual.
Excessive mechanical stress and inappropriate handling must be avoided.
Thedewpointtransmittercanonlybeutilizedinaccordancewiththeconditionsdenedinthe
technical data. Otherwise, inaccuracies of the measurement will occur and equipment failures
cannot be ruled out.
For the safety of user and for functionality of the equipment the, by the manufacturer recom-
mended steps to put into operation, to test and to maintain should be taken and completed.
Unauthorizedmodicationsoftheproductleadtolossofallwarrantyclaims.Thismaybeaccom-
plished only with an explicit permission of E+E Elektronik®!
The device is constructed for the operation of separated extra-low voltage (SELV).

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Manual EE355 Dew point transmitter
1.2.2 Installation, start up and control
The dew point transmitter is designed and built in accordance with the latest state in technology,
tested adequately and has been shipped from the factory in good order and condition.
As a user, you are responsible to comply with all applicable safety regulations amongst others:
• Instruction for installation
• Local standards and codes
The manufacturer has taken all actions to assure safe operation. The user has to make sure that
the equipment is positioned and installed in such a way that safe operation is not impaired.
The equipment is factory tested and shipped in good order and condition.
This manual contains information and notes of caution, which have to be followed by the user to
assure safe operation.
Mounting, electrical installation, putting into operation and maintenance should only be done by
qualiedpersonnel.Theplantoperatorshouldauthorizequaliedpersonneltooperateonthe
installation.
These professionals must have read and understood this and they have to follow the instructions
as detailed in this manual.
Check all connections of the entire installation thoroughly, before putting the system into opera-
tion.
Do not put a damaged product into operation and make sure this does not happen inadvertently.
Amalfunctionoftheequipmentshouldonlybehandledandxedbyauthorizedandqualied
personnel.
If it is not possible to repair the malfunction, take the equipment out of operation and make sure
that it cannot be put back into operation again.
Repairs not described in this manual may only be carried out by the manufacturer or by the
respective service organization.
Disclaimer of Liability
The manufacturer or their delegated representative is only liable in case of intend or gross negli-
gence. The accountability is limited to the value of the order issued at the time to the manufactur-
er.
The manufacturer is not liable for damages, originated from disregarding the safety instructions
or violating the instructions of the manual or operating conditions. Consequential damages are
excluded from the any liability.

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Manual EE355 Dew point transmitter
1.3 Environmental aspects
Products from E+E Elektronik® are developed and designed due to consideration of the importance of
environmental protection. Therefore, disposal of the product also should not lead to pollution of the
environment.
Single-variety components must be separated before the transmitter is disposed of. The electronic
components must be collected and as electronic scrap properly disposed of.
2 Product description
2.1 General
The compact EE355 Dew Point Transmitter with a measuring range down to -60 °C Td and an
robust stainless steel housing is ideal for OEM applications in compressed air systems, plastic
dryers and industrial drying processes. The core of the EE355 is the monolithic measurement cell
typeHMC200,manufacturedinthin-lmtechnology.Duetotheexcellentlongtermstabilityand
durability against condensation the EE355 has low maintenance needs.
An integrated auto-calibration procedure permits a measurement accuracy of <2 °C Td. The rec-
ommended calibration interval is 2 Years.
The measured values for dew point, frost point or ppm volume concentration are available on an
analog 4-20 mA and a digital Modbus RTU output.
2.2 Dimensions in mm (inch)
ISO-Thread
140 (5.5)
77 (3)
74 (2.9)
Ø30 (1.2)
Ø12 (0.5)
G1/2“
1/2“NPT
92 ( 3.6)
34.5 (1.36)
89 (3.5)
AD27
AD22
NPT-Thread
140 (5.5)
77 (3)
74 (2.9)
Ø30 (1.2)
Ø12 (0.5)
G1/2“
1/2“NPT
92 ( 3.6)
34.5 (1.36)
89 (3.5)
AD27
AD22

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Manual EE355 Dew point transmitter
2.3 Autocalibration
Dew point temperatures ranging from -60 to -20 °C (-76...-4 °F) at room temperatures correspond
to relative humidities of 0.08 to 5.37 % RH.
To guarantee the accuracy at the lowest humidity, even the smallest drift effects in the humidity
sensing element have to be compensated.
A special auto-calibration method is used to compensate the usual drift effects, which leads to
high-precision measurements even at the lowest dew point temperatures.
Autocalibration is carried out every 30 minutes and takes approx. 3 minutes. During the autocali-
bration, the analog outputs are frozen at the last measuring value.
2.4 Measurement range and Accuracy
ThedewpointtransmitterEE355hasaspeciedaccuracyof±2°Cinthemeasurementrange
-60...60 °C dew point.
Measuring signal limitation:
at medium temperature ≤20 °C: Td limitation = -80 °C
at medium temperature >20 °C: Td limitation = medium temperature - 100 °C
e.g. at medium temperature 30 °C the measuring signal is limited at -70 °C dew point.
60
40
20
0
-20
-40
-60
-80 010 20 30 40 50 60
-10
-20
-30
-40
Accuracy ≤ ±2°CTd
Accuracynotspecied
Measurement range
limitation dew point
Medium temperature [°C]
Dew point temperature -Td [°C]
Pic. 1 Dew point measurement range and specied accuracy
The maximum scaling of the analog output is -100...80 °C dew point.
3 Installation
3.1 Installation location
Select a location that offers optimum measuring conditions. Air must be able to circulate freely
around the sensing element.
Temperature differences between the process and the location of installation do not affect the
dew point measurement. However, attention should be paid to the fact that changes in the pres-
sure of a gas also changes the dew point. If there is a pressure difference between the location of
installation and the process, the measurement can be several tens of degrees dew point off.
The exact effects of changes in pressure on the dew point can be simulated using the E+E hu-
miditycalculator.Pleasendfurtherdetailsonourwebsitewww.epluse.com.

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Manual EE355 Dew point transmitter
Leaks should be avoided, because penetration of humidity from the environment will affect the
measurement.
Upon delivery the sensor is protected by a cap that keeps the dew point sensor dry. The cap should only be
removed immediately before installation into the application.
Pic. 2 Remove protection cap
3.2 Installing directly into the process
If installing directly into the process, a stop valve should be at both sides of the installation point.
This makes it easy to remove the transmitter for maintenance and calibration.
It is not permitted to use a sealing ring with a NPT 1/2“ thread. Appropriate PTFE sealing tape or sealant
should be used instead.
Insert the probe into the process and screw it as tight as possible by hand.
If there is a sealing ring, check the correct centering and tighten the screw connection with a
torque of 30 Nm.
OK NOT OK
üû
Pic. 3 Installing directly into the pipe
3.3 Installing the probe in a sampling system
Sampling is necessary if a direct installation of the probe in the process is not possible or not
required. Reasons may be:
• an excessive process temperature
• protecting the sensor against soiling
• the need to remove the probe without interrupting the process.
To obtain a representative sample of the process gas and to avoid measuring errors, please note

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Manual EE355 Dew point transmitter
the following:
• Differencesinpressurebetweentheprocessandthesamplingchamberwillresultinsignicant
measuring errors.
• Measurements at low dew point temperatures are sensitive to humidity penetrating from the
environment due to leaks. Therefore, the sampling system must be pressure-tight.
• Non hygroscopic materials must be used.
• The sampling line should be as short as possible.
• Theresponsetimeincreasesifthegasowis<1l/min(0.25gpm).
• Atoolowgasowcanresultinback-diffusionofhumidityfromtheenvironmentanddistortthe
measurement.
3.3.1 Basic sampling cell
The basic sampling cell offers the possibility to integrate the dew point transmitter into an existing
or self-constructed sampling system.
Pressure range: 0...64 bar (0...928 psi)
Order code: (ISO) HA050103 (NPT) HA050105
1
2
3
ISO NPT
1 G 1/2“ 1/2“
2 G 1/4“ 1/4“
3 G 1/4“ 1/4“
Pic. 4 Basic sampling cell
3.3.2 Sampling cell with quick connector
The sampling cell is specially developed for use in compressed air lines and has a quick-connec-
torsuitableforstandardcompressedairconnectionsDN7.2.Thisallowsthecelltobettedand
removed without interrupting the process.
Theowofgascanbeadjustedusingableedscrew.
Pressure range: 0...10 bar (0...145 psi)
Order code: HA050102
3
2
1
1 G 1/2“ ISO
2 Bleed screw
3 Quick connector DN7.2
Pic. 5 Sampling cell with quick connector

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Manual EE355 Dew point transmitter
4 Electrical Connection
The electrical connection is made via the 5-pin connector M12x1. An attachable mating connector
is included.
1 2
3
5
4
mA
+
-
18...28V DC
Output 4-20 mA
1
2
3
4
5
RS485 A (=D+)
RS485 B (=D-)
To meet the EMC Directive 2004/108/EC a shielded cable must be used.
4.1 Connecting cable - Accessory HA0108xx
1 BN V+
2 WH Output 4-20mA
3 BU GND
4 BK RS485 A (=D+)
5 GY RS485 B (=D-)
5 Setup and Adjustment
TheEE355isreadytouseandrequiresnocongurationbythecustomer.Thefactorysettingof
the analog output corresponds to the ordered type designation.
WithanoptionalModbustoUSBconverter(ordercodeHA011013)andthefreeEE-PCScong-
uration software the user can adjust the transmitter, set the Modbus parameters, and change the
scaling of the analog output.
5.1 Dew point adjustment by the user
Dew point adjustment by the user is possible only at low dew points. The adjustment can only be
carried out if the difference from ambient temperature to the reference dew point temperature is
<-60 °C.
Example:
Ambient temperature = 20 °C
Reference dew point temperature must be lower then -40°C.

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Manual EE355 Dew point transmitter
6 Modbus RTU
Instructions for Modbus-Protocol-Setup please see Application Note AN0103 (www.epluse.com/
EE355).
• The EE355 can be used in Modbus networks with max. 32 units.
• The bus termination shall be realized with 120 Ohm resistor (not included in the scope of supply)
• For proper function the power supply must be strong enough to ensure supply voltage within the speci-
edrange(seetechnicaldata)atanytimeandatalldevicesinthebus.Thisisparticularlyrelevantwhen
using long and thin cables which can cause high voltage drop.
6.1 Data Transmission
Adjustable Values Factory Setting
Slave Adress 1...247 243
Baud Rate 9600 / 19200 / 38400 9600
Data Bits 8 8
Parity None / Even / Odd Even
Stop Bits 1 / 2 1
6.2 Modbus Map
Themeasuredvaluesarestoredasa32Bitoatvalue.Dependingonthemeasurementunit
selected, the measurements are saved in SI or US/GB units.
Register Protocol-
Address
Measuring Value SI-Unit US/GB-Unit
ReadRegisters(FunctionCode0x03/0x04)/32Bitoatvalue
30026 0x19 Temperature °C °F
30028 0x1B Relative Humidity % %
30032 0x1F Dew point temperature °C °F
30042 0x29 Frost point temperature °C °F
30060 0x3B volume concentration ppm ppm
Read Registers (Function Code 0x03 / 0x04) / 16Bit integer value
30501 0x1F4 State of auto-calibration
0 ... normal operation
1 ... auto-calibration active
Write Registers (Function Code 0x06) / 16Bit integer value
60001 0x00 Slave-ID
60002 0x01 RS485 Data Transmission

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Manual EE355 Dew point transmitter
7 Maintenance
7.1 Filter replacement
Asoiledltercapshouldnotbecleanedbutreplacedwithanewone.Theordernumberfornew
ltersisHA010103.
Whenreplacingthelter,pleasenotethefollowing:
• Unscrewtheltercapverycarefullytoavoiddamagingthesensingelement.
• Handlingtheltermightclogthepores.Useglovestoscrewonthenewlter.
Filter cap
Sensing element
Pic. 6 EE355 Filter and Sensor
7.2 Sensor cleaning
Do not touch or rub the sensing element during the cleaning process.
It is strongly advised NOT to try cleaning the sensor by mechanical means, such as rubbing the sensor with
cotton material!
The best way to clean the sensor is to use an ultrasound cleaner. This is a commercially available
piece of equipment, which generates ultrasound vibrations in a small bath. The cleaning agent in
the bath should be 50% isopropyl alcohol + 50% distilled water.
Removetheltercapfromthetipofthesensingprobe.Thishastobedoneverycarefullyin
order to avoid damaging the sensing element.
Hold onto the sensing probe and slowly stir the tip of the sensing probe in the ultrasound bath for
about 1 minute. The sensing element, the leads and the socket should be immersed in the liquid.
If an ultrasound cleaning bath is not available, stir the sensor as described above in a container
with a mixture of 50% isopropyl alcohol + 50% distilled water for approx. 2-3 minutes. This proce-
duresufcesfor“normalsoiling”.
In the event of extreme soiling – which can be seen on the humidity sensing element with the
naked eye – continue the operation until the pollutants are dissolved.
After the cleaning procedure with isopropyl alcohol, stir the tip of the sensing probe in a container
with distilled water for about 30 seconds and then allow it to dry at room temperature.

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Manual EE355 Dew point transmitter
8 Accessories
Description Order code
M12x15pinconnectioncablesocket/yingleads1.5m HA010819
M12x15pinconnectioncablesocket/yingleads5m HA010820
M12x15pinconnectioncablesocket/yingleads10m HA010821
Modbus - USB converter for EE35x HA011013
Sampling cell with quick connector HA050102
Basic sampling cell ISO HA050103
Basic sampling cell NPT HA050105
Sampling cell for ambient pressure HA050106
Stainlesssteelsinteredlter(includedinthescopeofsupply) HA010103
Attachable mating connector - 5-pin (included in the scope of supply) HA010708
8.1 Scope of Supply
• Dew point transmitter
• M12x1 Attachable mating connector - 5 pin, straight
• Quick manual
• CalibrationCerticateacc.DINEN10204-3.1
9 Technical Data
Measuring values
Dew point (Td)
Measurement range -60...60 °C Td (-76...140 °F Td)
Accuracy 1)
Response time t90 < 5 min -20 °C Td ( -4 °F Td) →-60 °C Td ( -76 °F Td)
<15 sec -60 °C Td ( -76 °F Td) →-20 °C Td ( -4 °F Td)
Volume concentration (ppm)
Measurement range 20...200,000 ppm
Accuracy at 20 °C (68 °F) and 1013mbar 5 ppm + 9 % from measured value
Output
Analog output (scalable) 4 - 20 mA (3-wire technology) RL < 500 Ohm
Maximum adjustable scaling -100...80 °C Td (-148...176 °F Td)
Resolution of analog output 2 µA
Digital interface MODBUS RTU (max. 32 units in one bus)
Temperaturedependence ±5ppmofthemeasuringspan/°C(Deviating from 20 °C)
General
Supply voltage (Class III) 18...28 V DC
Current consumption at 24V DC <20 mA + load current /
with autocalibration: 100 mA + load current
Pressure range of use 0...80 bar
Housing / protection class Stainless steel 1.4404 (AISI 316L) / IP65
Electrical connection 2) M12x1 5-pin plug
Sensor protection Stainless steel sintered filter
Temperature / humidity operating range -40...70 °C (-40...158 °F) / 0...100 % RH
Storage temperature range -40...60 °C (-40...140 °F)
Electromagnetic compatibility EN61326-1 EN61326-2-3 Industrial environment
FCC Part 15 ICES-003 ClassB
1) The accuracy statement includes the uncertainty of the factory calibration with an enhancement factor k=2 (2-times standard deviation). The accuracy was calculated in
accordance with EA-4/02 and with regard to GUM (Guide to the Expression of Uncertainty in Measurement).
2) Field-attachable mating connector is included in the scope of supply.
80
60
40
20
0
-20
-40
-60
010 20 30 40 50 60
-10
-20
-30
-40
80
60
40
20
0
-20
-40
-60
-80
010 20 30 40
-10
-20
-30
-40 6050
Dew point temperature (°C)
Medium temperature (°C)
Accuracy: ≤±2°C Td

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Manual EE355 Dew point transmitter

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Manual EE355 Dew point transmitter

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www.epluse.com
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