domat UI090 User manual

domat UI09xx 03/2017 Subject to technical changes. 1
UI09x
Communicative room unit with CO2
sensor
Summary
The room unit with CO2sensor contains temperature sensor, NDIR CO2 sensor for
carbon dioxide concentration measurement, optional humidity sensor, and
control knob for setpoint control and other settings. The binary output is
controlled either on a remote basis, or as thermostat, hygrostat or CO2controller.
The units communicate over Modbus RTU / RS485 and they can be used as open
system components with majority of building control system and controllers.
Application
▪Air handling units and air condition in rooms with variable load –
schools, cinemas, lecture halls etc.
▪monitoring and recording of temperature, and CO2concentration
indoors
Function
The units acquire temperature, CO2concentration, and optionally relative humidity in
the room, temperature correction (controlled by the knob) and required operation
status which is set by short push of the knob or in the menu. In the configurable menu
following values can be set and displayed:
–temperature, actual temperature correction
–humidity (actual value only at room units containing the humidity sensor)
–time (only display at room units with RTC)
–basic setpoint - day
–basic setpoint - night
–outside temperature for heating enable
–DHW temperature
–heating curve type (1...4)
–operation mode (Residential with Day, Night, Time schedule, Off, or Hotel /
Office with Comfort, Standby, Party, Off)
–fan stage (Auto, Off, St.1, St. 2, St. 3)
–A/C mode (Auto, Heating, Cooling, Off, Fan only)
–weekly scheduler: 7 days, up to 6 events per day

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–another 5 variables (air quality, fan speed etc.) –each has a profile where max.
and min. values, step, number of decimals, and symbol set are defined.
It is also possible to set / reset any of the LCD symbols on the display over Modbus.
The turn / push knob has three basic functions:
•instant edit (turning the knob) –settings of one predefined analogue value,
usually room temperature correction
•quick edit (short push) –change of predefined state, e.g. Presence (Comfort /
Standby / Off), Air condition (Auto / Heating / Cooling / Fan only / Off) etc.
•long push –jump to menu where values are listed by turning the knob, short
push selects the value to be edited, and the value is changed by turning the
knob followed by short push for confirmation.
After definable inactivity time, the display goes back to its basic state with rolling
display of selected values (e.g. actual temperature and CO2).
The unit Modbus address and functionality is defined over the RS485 interface with
service software ModComTool which is free for download at http://domat-
int.com/en/downloads/software. To interface the room unit to the computer use the
USB/485 converter M080, RS232/RS485 converter M011, or any suitable RS485
converter.
Technical data
Power supply
24 V AC +/- 10%
Consumption
600 mVA
Temperature measuring range
-20 ÷ 70 °C, accuracy according to DIN IEC 751, Class B
Humidity (selected types only, see table
below)
10 ÷ 90 %rH (30-70% +/- 3.5%, 10-90 +/- 4.5%)
CO2measuring range
0 ... 5000 ppm
CO2measuring method
NDIR (Non-dispersive Infra Red)
CO2measuring accuracy
30 ppm 5 % of measured value, software correction
possible
Reaction time of CO2sensor (90 %)
60 s
Protection degree
IP20
Input
1x for dry contact, 24 V AC, 5 mA
Output
1x solid state relay, zero switching, AC load, 24 V AC,
maximum switched current 0,4 A
Setpoint
according to configuration, +/- 10 to +/- 1 K
Communication
RS485 - Modbus RTU, slave, selectable speed 1200 ...
115200 bps, N,8,1
The interface is optically separated.
Display
LCD 60 x 60 mm, symbol set see above
Terminals
screw terminals for wires 0,14 –1,5 mm2

domat UI09xx 03/2017 Subject to technical changes. 3
Cover
ABS, RAL9010, other colours
Weight
0,17 kg
Dimensions
see below
Terminals
1
2
3
4
5
6
7
8
9
As seen when removing the display
part. The wiring goes towards the
center of the unit so that the cable can
be brought through the aperture in
the middle of the bottom part.
1: K- communication RS485 -
2: K+ communication RS485 +
3: DI input (dry contact against G0)
4: DO output against G0
5: G0 power, DI, DO –common
point
6: G0 power, DI, DO –common
point
7: G power
8: -- connector not installed
9: -- connector not installed
DIP switches
Back of the PCB
BUS END: if ON, the bus is terminated
(if last device on the line)
USR: not used, reserved for future
applications
INIT: sets the controller into default
state and sets bus address to 1, baud
rate to 9600. To init, proceed as
follows:
- connect the device over RS485 to a
PC with domat.exe config tool
- set INIT to ON
- apply power (use only the connector
without bottom)
- find the controller in the tool (Scan)
- set INIT to OFF
- in the ModComTool tool, open the
controller window
- click the Init button in the tool
- remove and apply power.

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Measuring
range
The integrated temperature sensor range is -20 to +70 °C. Read and entered values are
available at the RS485 bus where a controller or SCADA reads them. The supervising
system can also write values to the unit (operation mode, fan stage, etc.), which are
displayed on a large LCD display.
The CO2 measuring range is 0...5000 ppm. A range defined by two parameters is then
recalculated to 0...100 %, value, which is displayed on the LCD, e.g. 300...2500 ppm
displays as 100...0 % (of air quality) or 0...100 % (of air pollution). At the bus it is possible
to read the absolute value in ppm, too. The parameters are set through the
configuration software ModComTool or by direct writing into Modbus registers.
Default values are 0% ... 350 ppm (fresh air), 100 % ... 2500 ppm (maximum pollution).
Autocalibration
Transportation and aging may cause sensor drift. The sensor records the lowest reading
and expects that at least once per 8 days the CO2level reaches the outside air
concentration (400 ppm). The lowest measured value is then assigned the 400 ppm
level. Autocalibration does not work if the room is occupied 24 hours a day, or there
are no periods when the gas level drops to background (e.g. greenhouses). Then, the
autocalibration function can be disabled through the configuration program or by
direct writing into the Modbus register. The autocalibration is set to on by default.
During the first days of operation, until the first autocalibration, the sensor may read
values which differ from the real values by several hundreds ppm, e.g. 200 ppm at
night etc. This error is automatically corrected with the first autocalibration.
Room unit as
controller
The binary output (SSR), if available, may be controlled either from a PLC over the bus,
or configured as one of controllers:
•thermostat
•hygrostat (only at devices with rH sensor)
•controller switching at a predefined CO2level.
Setpoint and hysteresis are set over the bus. This function is not suitable for standard
integrated room control, it is to be used as supplementary only. The setpoints are not
influenced by operation modes (Day, Night, Off).
Installation
Units are intended for operating in a normal and chemically non-aggressive
environment. They do not need any servicing or maintenance. Install them in a vertical
position at places where they can be operated easily and measure correct values of
temperature and humidity, i.e. in the height of about 150 cm, with no direct sunlight
or other heat / cool source (AHU outlets, refridgerator, electrical appliances). The
device consists of two parts: bottom with screw terminal block and cover containing
PCB, display, and the knob. The bottom part is fixed by 2 or 4 screws to any flat surface
or a flush-mounting box Ø 50 mm. At the back of the bottom there is an aperture for
cabling. The bottom should be installed and cabling connected first, and the upper part
inserted after the construction works have been finished to prevent damage to the
unit.
Seal the conduits to avoid influencing the sensor by draught. Use insulating pad when
installing the sensor on cold walls. Avoid sensor exposition to sunlight or other heat
sources.

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Opening the
cover
When removing the display part, proceed as follows:
-press gently the side parts of the unit and pull the right of the display part by
several milimeters
-pull the left of the display part
-pull the display part and remove it from the bottom.
Do not bend the display part too much, the connector pins could be damaged. The
locks are only at the sides of the display part, not at the top nor bottom.
Communication
The units communicate with a controller (master) over RS485 using Modbus RTU and
thus they can be used in a number of control and SCADA systems. The register
description is available in a separate document Room units UI... –Communication
description. User manual for domat.exe and detailed description of the room unit
functions find in the document Room units configuration –User manual.
Display
Over Modbus, it is possible to set / reset
the complete symbol set except for the 7
segment digits, „Error“ and „Setting“
texts, and symbols of °C, °F, %, and rH.
Those are part of the configurable menu
profiles. The register description is
available in a separate document Room
units UI... –Communication description.
LCD symbol set
Type table
Type
LCD
Knob
CO2
DI
DO
t
rH
UI090


✓
-
-
✓

UI091
✓
✓
✓
1
1
✓

UI092
✓
✓
✓
1
1
✓
✓
UI093
✓

✓
1
1
✓
UI094
✓

✓
1
1
✓
✓
UI095
✓
✓
✓
-
-
✓

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Units with no knobs are used as indicators, units with no knobs / display are used as
communicative CO2 and temperature / rH sensors, both optionally with remote
controlled input / output, if available. For simple control applications, control functions
may be used (see above).
Dimensions
All dimensions in mm.
RoHS notice
The device contains a non-rechargeable battery which backups the real-time clock and
part of the memory. After the device is not operable, please return it to the
manufacturer or dispose of it in compliance with local regulations.

domat UI09xx 03/2017 Subject to technical changes. 7
Changes in
versions
11/2015 —Default values of ppm for 0 % a 100 % added.
09/2016 —Changed the format and reference to the configuration software.
03/2017 —Added picture and description of the installation and link on the datasheet
with other colours.