ICS IL Series Dimensions

• Two designs duct version
(ILK)
wall mounting (ILW)
• Different
physical
outputs
humidity and temperature and all
hx values 1)
• Output signals RS232 with ASCII protocol
RS485 with Modbus RTU protocol
• Special versions sealing for increased
requirements, e.g. condensation
sealing against vibrations
• Filter protective basket ZE07 (IP 00)
lter with membrane ZE08 (IP30)
PTFE sintered lter ZE05 (IP65)
Product info sheet IL Series digital
Humidity/-temperature sensors for digital data
transfer RS485 / MODBUS-RTU or RS232 for
use in heating, ventilation and air conditioning
Measuring medium air, pressureless,
non-aggressive, non-condensing
Min. air speed 0.5 m/s
Operating temperature -40...+80°C
Storage temperature -40...+85°C
Degree of protection of measuring head
with protective basket ZE07 IP00
with membrane lter ZE08 IP30
with PTFE sintered lter ZE05 IP65
Degree of protection housing IP65
Material of housing PC (light grey / white)
General data
Power supply, external 6...30 VDC
Max. transfer distance RS232/RS485 15m/1000 m
Consumption of electronics < 1,0 mA
Directive about electromagnetic compatibility 2014/30/EU
DIN EN 61326-1 ............................................. issue 07/13
DIN EN 61326-2-3 .......................................... issue 07/13
Humidity
Sensing element calibrated sensor chip calHT
Output range 0...100 %rh
Accuracy
30...80 %rh at 10...40°C ±3 %rh
< 30 %rh or > 80 %rh at 10...40°C ±5 %rh
Inuence of temperature < 10°C or > 40°C typ. ±0.06 %rh/K
Technical data
Temperatur
Sensing element calibrated sensor chip calHT
Output ranges -40...+85°C
Accuracy
at 10...40°C ±0.8 K
<10°C and >40°C see diagramm
Electrical data
1) The accuracy of the calculated values depends on both the opera-
ting point in accordance with the hx diagram and on the primary values
measured. The hx processor operates in the range -30°C < T < +70°C,
5% rh<F<95% rh. Values outside this range are not calculated, the last
valid value is displayed. Normal atmospheric pressure of 1013.25 mbar
is used when calculating the hx values.
ILK
ILW

Working range of humidity and temperature
Connection diagram RS232 and RS485
ILW(K)KR... with data line AWKR.02.00-xx.x ILW(K)KM...
recommended working range
% r.h.
100%
80%
60%
40%
20%
0%
-40°C 0°C 40°C 80°C
Temperature accuracy of the sensors
ZE36 as designation F5.2 adapter required for sensor tubes Ø 12mm
for humidity standard ZE 31/1 and wall console 20.009
ZE 31/1-12
ZE 31/1-33
ZE 31/1-75
ZE 31/1-84
ZE 31/1-97
as designation F5.2
humidity standard to check the accuracy of the sensors 12 %rh at 25°C
humidity standard to check the accuracy of the sensors 33 %rh at 25°C
humidity standard to check the accuracy of the sensors 75 %rh at 25°C
humidity standard to check the accuracy of the sensors 84 %rh at 25°C
humidity standard to check the accuracy of the sensors 97 %rh at 25°C
ZE33 as designation F5.2 adapter for humidity standard ZE 31/1
Flange 20.045 xing ange for sensor tubes Ø 12mm with rubber sealing
5
9
61
RD
BN
YE
BK
Shield
+UB
GND
A / TX
B / RX
+UB
GND
TX
RX
Accessories
Designation Order reference Info sheet Description
Sub-D
data line
RS232
AWKR.02-00-xx.x -
Sub-D data line up to max. 15 m for direct connection to serial PC interface;
(e.g. 15m: AWKR.02-00-15.0) Note: jack of data line IP30 / -10...50°C !
USB adapter
RS232->USB USB adapter - USB adapter for Sub-D-data line To connect up the Sub-D-data line to a USB interface on the PC or Laptop
Setup cable
UART -> USB
BKKM.02.AK-01.8 - Connecting cable sensor --> PC, suitable for all sensors of the L Series digital,
to congurate / change the Modbus parameters

Product Key
IL Series digital
The 16 character alphanumeric order number for the desired type is composed of the order code listed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Series
Design
Physical outputs
Output signals
Operating conditions / Special versions
Measured variable and output range 1
Measured variable and output range 2
Supply voltage
Measuring head / Filter / Diameter
Design description
Technical Data Options Order Code
1Series IL Series L
2Design Duct version K
Wall mounting W
3Physical outputs Humidity and Temperature, dew point temperature (°C), enthalpy (kJ/kg),
mixing ratio (g/kg), absolute humidity (g/m³) and wet-bulb temperature (°C) K
4Output signals RS232 ASCII protocol R
RS485 MODBUS RTU protocol M
5 6 Operation conditions /
special versions
Standard 00
Sealing against vibrations (optional) 0V
Sealing for increased requirements (e.g. condensation, optional) 0S
7 8 output range
1 relative humidity and humidity dependant hx values F1
9 10 output range
2 -40...85 °C 48
11 Supply voltage 5...30 V DC 5
12 13 Measuring head /
lter / diameter
ZE05: PTFE sintered lter, Ø 12 mm 05
ZE07: protective cage, plastic, open, Ø 12 mm 07
ZE08: protective cage, plastic, with membrane, Ø 12 mm 08
14 15 16 Description of design Duct sensor, sensor tube length 220 mm (standard) 00 G
Wall mounting, sensor tube length 50 mm (standard) 00 1

Dimensional drawing series ILW
Dimensional drawing series ILK
83
57
83
41,5
12
40220
1
15
40
18
26
57
1
15
83
8350
12
Ordering Example
L K K M 0V F1 48 5 05 00G
Series:
IL Series
Design:
Duct version
Physical outputs:
active outputs
Output signals:
MODBUS RTU
Operation conditions / special versions:
Sealing against vibrations
Measured variable and output range 1:
Measured variable and output range 2:
Supply voltage:
5...30 V DC
Measuring head / Filter / Diameter:
PTFE sintered lter ZE05 / 12 mm
Description of design
Duct version, sensor tube length = 220 mm

Dew formation Dew formation and splashes do not damage the sensor, although measurement readings are cor-
rupted until all moisture on and around the sensing element has dried up completely.
Contaminated lters If the PTFE sintered lter ZE05 and the membrane lter ZE08 is contaminated with dust, grease and
oils, this can have a negative impact on the dynamic behaviour of the sensor.
Cleaning of lters If necessary, soiled lters and protective baskets can be screwed off and rinsed carefully. Bear in
mind the sensors wil not measure accurately until lters are completely dry. Please do not touch the
highly sensitive sensing element.
Cleaning of
sensor chip
Loose dust can be carefully cleaned off the humidity sensing element using distilled water or by
blowing the dust carefully off. Please do not touch the highly sensitive humidity sensing element.
Damaging inuences Depending on their type and concentration, aggressive media containing solvents can cause incorrect
readings or cause the sensor to fail.
Substances deposited on the sensor element (e.g. fats, oils, resin aerosols, paint aerosols, smoke
deposits etc.) are harmful as they eventually form a water-repellent lm or deteriorate the dynamic
behaviour of the sensor.
Mounting and user information
Position Install the sensor at a place where characteristic levels of humidity occur. The sensor tube resp.
measuring head or measuring chamber should be exposed to the ow of air. Avoid installation next
to heaters, doors or on outer walls. Avoid places exposed to the sun. Not reaching the given mini-
mum air speed can lead to measurement errors.
The sensors for wall mounting (series LW) can be mounted on a patress or directly on the wall.
It is important that the surface is even.
When mounting the sensors on a patress, avoid external air getting onto the humidity measuring
element of the sensor by sealing it appropriately.
The sensor should be mounted in such a way that no water can get into it.
To close the housing the screw is tightened until it stops.
We recommend that you lay the connection lines in a loop so that any water that may be present
can run off.
Fixing ange For mounting the xing ange (duct mounting of series LK), a hole pattern is printed on the packa-
ging.
To x the sensor, simply open the opening tab of the ange by nger pressure or with the help of a
pair of pliars. The sensor can be xed in the ange at any position.
Connection The electrical connection must be carried out by qualied personnel only. The sensors of the L Series
contain components, which can be damaged by the effects of electrical elds or by charge equalisation
when touched. When mounting the sensor, protective measures must be taken.
Lines to and from the sensor must not be installed parallel to strong electromagnetical elds.
In the case of a possible overvoltage please install surge protection devices.

RS485 with MODBUS-RTU Protocol
Serial interface
The following parameters are possible for data transfer via the EIA-485 interface on the ModBus sensors made by
Mela®:
• Baud rate: 19200 / 9600 / 4800 / 2400 / 1200 / 600
• Data bits: 8
• Parity: N / E / O
• Stop bits: 1 / 2
Modus 19200@8N2 is pre-dened.
Access to Modbus registers
To ensure compatibility with all Modbus masters, all available registers can be read both with function code 03hex (read
holding register), as well as with function code 04hex. Registers with additional write permission can be modied with
function code 06hex (write holding register). All registers available with Modbus sensors by Mela are listed in table 1.
Register-no. Data type Value Permission
0FLOAT32 Temperature (°C)
readable
1
2UINT16 Alarm code temperature
3FLOAT32 Relative humidity (%rH)
4
5UINT16 Alarm code humidity
6UINT32 Serial number sensor
7
8UINT32 Serial number sensor
9
10 FLOAT32 Dew point temperature (°C)
11
12 FLOAT32 Enthalpy (kJ/kg)
13
14 FLOAT32 Mixing ratio (g/kg)
15
16 FLOAT32 Absolute humidity (g/m³)
17
18 FLOAT32 Wet-bulb temperature (°C)
19
20 UINT16 Alarm code hx processor
205 UINT16 Modbus address read and writeable
Functioning
The measured values for relative humidity, temperature and the corresponding alarm codes are saved in registers
0…5 in a cycle time of 2s. Registers 6(8) and 7(9) contain the sensor‘s serial number. If an hx value is scanned from
registers 10…19, this is recalculated at the time of the scan, based on the current temperature and the relative humi-
dity. The hx processor emits an alarm code if the values for temperature or relative humidity are outside the permis-
sible input range. No calculation is made in this case, and the register displays the last valid value for each variable.
The memory organisation for the temperature and air humidity readings, as well as for the serial number, is Little
Endian. This means that the low byte word is in the lower register and the high byte word is in the higher register.
Table 1 - Modbus register

Raasdorfer Str. 18
07987 Mohlsdorf-Teichwolframsdorf
Tel.: [phone] · Fax: [phone]
MELA Sensortechnik GmbH
Marion Scholz
1800 (L)
BKKM.02.AK-01.8
Table 2 lists all the possible alarm register values when measuring temperature (reg. no. 2).
Alarm code Meaning
0 no alarm, the temperature value is within the limits
3 no sensor element detected
Table 2 - alarm codes temperature
Table 3 lists all the possible alarm register values when measuring humidity (reg. no. 5).
Alarm code Meaning
0 no alarm, the humidity value is within the limits
3 Wire break or no sensor element detected
Table 3 - alarm codes humidity
Table 4 lists all the possible alarm register values of the hx processor (reg. no. 20).
Alarm code Meaning
0 no alarm, input values are within the limits
1 max. input value of humidity 95%rh and/or temperature +70°C is exceeded
2 min. input value of humidity 5%rh and/or temperature -30°C is below limit
3 hx processor deactivated
Table 4 - alarm codes hx processor
The Modbus address can be modied at any time via write access to the address register (reg. no. 205). Permissi-
ble slave addresses are within the 1...247 range. Using address 0 as a slave address is not permissible. Addresses
within the 248…255 range are reserved for special Modbus services and their use as a slave address is not permis-
sible either. Address 1 is pre-dened.
Conguration of Modbus parameters
In standard mode (and in the network if required), the Modbus address for all sensors can be modied by entering
an appropriate write command. The write command will still be acknowledged using the old address. The sensor can
then be accessed immediately via the new address.
Further conguration of Modbus parameters, such as address, baud rate, parity and stop bits is only possible with the
suitable setup cable BKKM.02.AK-01.8 (see accessories on page 2). These settings are then made from a PC via the
ModSens-Setup software available for download. For this, the sensors must not be in the network.
.
Fig. 1
The ModSens Setup software and the documentation are available on our Homepage as a free download
(http://melasensor.de/download/).
Service USB

Operation
To connect directly to a PC, all you need is an integrated RS485 interface or an external adaptor. Mains power can
also often be supplied in this way. A software program such as Modbus Poll will then assume the role of the master.
Further measures must be taken for more challenging applications in the network, for long distances and/or in
environments with electromagnetic interference. The bus must be designed in a daisy chain structure without
spurs. For this reason, any cables connected to the sensors have a double data line pair – one incoming and one
outgoing. The data line must be designed as a screened and twisted pair. The rst and the last bus nodes must be
terminated. If DC termination is sufcient, the integrated resistance of 135Ω can be switched between A and B –
provided this is available on the relevant model. To do this, switch the jumper in the appliance to the corresponding
position or bridge the corresponding pins in the connector. If you have to use transmission line polarisation, we
advise against using DC termination. Instead you should use AC termination. The required series connection for
the resistor and the capacitor can then be switched between A and B on the second data line pair of the connection
cable or on the second terminal pair in the terminal block.
A Mela Modbus sensor according to the RS485 standard represents 1/8 unity load. If the network only contains
sensors in this impedance category, 256 bus nodes are theoretically possible instead of 32. However, due to the
available address space, in practice the number reduces to 247.
The scanning interval should not exceed 2 seconds across the entire network.
For further informationen see http://www.modbus.org/ .
RS232 with ASCII Protocol
Serial interface
The data transfer via the RS232 interface is effected with the following parameters:
•Baud rate: 9600
•Data bits: 8
•Parity: N
•Stop bits: 1
If power is also supplied to the sensor via the interface, the RTS and DTR signals must also be permanently enabled.
ASCII protocol
Approximately every 3 seconds (approx. 5 sec in case of an error), the sensor transmits a character string containing
the measured values for relative humidity, temperature and the corresponding alarm codes and serial numbers. A
checksum ensures the validity. The output character string has a constant length of 41 characters in the following
format:
@T;<Sign>;<Temperature>;<Alarmcode>;F;<Humidity>;<Alarmcode>;<Serialnumber>;<Sum>\r\n
The individual characters and elds have the following meanings:
„@“ Begins a protocol frame
„T“ Marks the temperature value
„F“ Marks the humidity value
„;“ Separator
„\r“ Carriage Return
„\n“ Line Feed
<Sign> Temperature plus/minus sign, „+“ or „-“
<Temperature> 5 characters, two integer places, two decimal places from „0“ … „9“, Comma symbol is „.“
<Alarmcode> 3 characters, „A00“ … „A04“
<Humidity> 6 characters, three integer places, two decimal places from „0“ … „9“, comma symbol is „.“
<Serialnumber> 8 characters from „0“ … „9“
<Sum> 2 characters from „0“ … „9“ or „A“ … „F“
Examples:
1: @T;+021.37;A00;F;038.92;A00;12345678;38\r\n
2: @T;+018.97;A00;F;099.54;A00;00251979;0A\r\n

Table 1 lists all the possible values when measuring temperature
Alarm code Meaning
A00 No alarm, the temperature value is within the limits
A03 no sensor element detected
Table 2 lists all the possible values when measuring humidity
Alarm code Meaning
A00 no alarm, the humidity value is within the limits
A03 no sensor element detected
The sum is calculated according to the following algorithm with reference to example 1:
1. Add up the decimal representation of all ASCII characters from “@“ to the nal „;“
64 („@“) + 84 („T“) + 59 („;“) + 43 („+“) + 48 („0“) + 50 („2“) + … + 54 („6“)+ 55 („7“)+ 56 („8“) + 59 („;“) = 1991
2. Divide this sum by 256 to nd the remainder
1991 % 256 = 199
3. Subtract the remainder from 255
255 – 199 = 56
4. Interpret the decimal result as a hexadecimal number
56 = 38hex
5. Compare the individual hexadecimal numbers with the transmitted ASCII characters of the checksum
38hex →„3“ & „8“ √
VisualPMU Freeware for RS232
This simple and very clear visualisation software supports the data output of a sensor via a serial interface on the PC or
laptop without an additional power supply.
To use this, it is necessary to install the accessory Sub-D data line (refer to accessories and connection diagrams). For USB
connections, a USB adapter can be supplied (see accessories).
The relative humidity, the dew point and the temperature (°C or °F) can be displayed and can be depicted as a graph.
Apart from that, the programme has a simple data logger function. Recorded data can be exported to other programmes.
This freeware version can be found on our Homepage as a free download (http://melasensor.de/download/).