Comet U0110 User manual

www.cometsystem.com
User‘s Guide
U0110
U0111
U0121
U0122
U0141
U3120
U3121
U3631
U4130
U3430
U4440
U0541
U5841
U6841
U7844
USB Datalogger

2IE-LGR-Uxxxx-01
© Copyright: COMET System, s.r.o.
This User’s Guide may not be copied, and its contents may not be changed
in any way without explicit consent of COMET System, s.r.o.
All rights reserved.
The COMET System, s.r.o. company is continuously developing and
improving its product. COMET System, s.r.o. reserves the right to carry out
technical changes in equipment or product without any previous notice.
Contact address of this device’s producer:
COMET SYSTEM s.r.o.
Bezrucova 2901
756 61 Roznov pod Radhostem
Czech Republic
www.cometsystem.com

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List of contents
SAFETY MEASURES AND UNAUTHORIZED MANIPULATIONS .............6
GUIDE TO INSTALLATION AND USAGE OF THE DEVICE......................7
Installing the datalogger, placing the probes.................................7
Device set-up................................................................................8
Running the device.......................................................................9
Device disposal procedure............................................................9
OPERATING THE DATALOGGER FROM THE KEYPAD........................10
Displaying the device data..........................................................10
Menu Options .............................................................................14
MODELS PRODUCED.............................................................................15
U0110 One-channel thermometer...............................................15
U0111, U0121, U0141 One-, two- or four- channel thermometer for
external probes...........................................................15
U0122 Two-channel thermometer with external probe................16
U3120 Compact thermometer - hygrometer................................16
U3121 Thermometer –hygrometer for external probe ................17
U3430 Compact thermometer –hygrometer - CO2concentration
meter ..........................................................................17
U3631 Compact thermometer –hygrometer with optional external
temperature probe ......................................................18
U4130 Compact thermometer - hygrometer - pressure gauge ....19
U4440 Compact thermometer –hygrometer - pressure gauge -
CO2concentration meter.............................................20
U0541 Two-channel thermometer for external probes with 2 inputs
0 - 10 V.......................................................................21
U5841 Datalogger with 3 inputs 0 - 10 V and 1 binary input........22
U6841 Datalogger with 3 inputs 0 - 20 mA and 1 binary input.....23
U7844 Two-channel binary-input counter....................................24
COMET VISION PROGRAM....................................................................25
SETTING UP THE DEVICE......................................................................26
How to set up the device by means of a program........................26
The device setup from a program (Configuration).......................26
APPLICATION NOTES.............................................................................32
RECOMMENDATIONS FOR OPERATION AND MAINTENANCE...........34
TECHNICAL PARAMETERS....................................................................37
Power supply..............................................................................37
USB communication interface.....................................................38
Measurement, data storage and real time circuitry......................38
Parameters of datalogger inputs.................................................39
Operating and storage conditions ...............................................51
Mechanical properties.................................................................51
ANNEXES................................................................................................52
Annex 1: Selected error messages of the device ........................52
Annex 2: Connection of the Pt1000/E series probe connector ...53
Annex 3: Connection of the Digi/E probe connector (female).....54

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Annex 4: Accuracy of the dew-point temperature measurement 54
Annex 5: Connecting block ........................................................54
Introduction
This datalogger is designed for autonomous measurements andrecording of
physical and electrical data, with the data recording interval from 1 s to 24 h.
The inputs and ranges of quantities to be measured are determined by the
model type the user has bought. The user cannot modify them. This portable
device can be mounted in a fixed-position. To set up datalogger, a PC with
a USB interface is needed.
This device allows:
- to measure and process input data coming from internal or external
sensors, binary inputs, counters and voltage or current inputs.
- to detect and log minimum and maximum values (existing since their last
manual resetting) of each quantity,
- to display the measured values on an LCD display. Some features can be
controlled by two push buttons situated next to the display (device
switching off and on, deactivation of alarm signalling, Min/Max value
resetting),
- to store an autonomous chronological record of measured values in
internal non-volatile memory. The values to be collected can be measured
at the instant of recording or as average or min/max values detected
during the recording interval. Recording can be performed continuously or
at the alarm time only. The recording mode can be also set optionally as
non-cyclic to stop at the memory filling up, or as cyclic. In this mode the
originally recorded values will be overwritten by fresh ones after the
memory unit getting filled up.
- to set up two alarm signalling limits for each quantity to be measured. The
alarm signalling canberealised visually, optionally by a symbol appearing
on the display or by a short blink of an LED, or acoustically
- to be supplied in autonomous manner from an internal primary lithium
battery, CO2sensor models are powered by an internal Li-Ion accupack
that can be charged using a conventional USB charger. Other models can
not be charged.
- to communicate with a computer by means of a USB interface (all device
settings, recorded data downloading, and online monitoring). To
communicate, the datalogger utilises the HID USB standard, which does
not require additional controllers to be built into the PC.

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General view of a Uxxxx series datalogger (U0141 model):
Dimensional drawing:
U0110 U3120, U4130 U3430, U4440
U0111, U0121, U0122 U3631 U0541, U5841
U0141, U3121 U6841, U7844

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Safety measures and unauthorized manipulations
Read the following safety directions carefully before putting the device into operation.
Follow these instructions when using the device!
•Operating and storage conditions. Observe the recommended operating and storage
condition asquoted in theTechnical parameters. Models with a CO2sensor containing aninternal
lithium-ion accupack should not be exposed to temperatures above 60 °C Do not expose the
device to direct radiation of heat sources and sun.
•Fire and explosion hazard. It is not allowed to use this datalogger within hazardous areas,
especially those endangered by a potential explosion of combustible gases, vapours or dust.
•Device cover. Do not operate the datalogger without the cover. Proceed always exactly
according to instructions that are given later in this User’s guide.
•Aggressive surroundings. Do not expose this device to any kind of aggressive surroundings,
to chemicals or mechanical shocks. Use soft tissue for cleaning. Do not apply solvents or similar
aggressive agents.
•Battery damage. Should the battery casing get damaged or should the whole device get
destroyed, carry it outside thefire, high temperature or water affected area to a safe fire-protected
place. Protect yourself and the environment against escaping gases and against being soiled
with the battery electrolyte.
•Failures and servicing. Do not try to repair the device yourself. If the device shows signs of
unusual behaviour, screw off the rear cover to remove battery or disconnect the accupack
connector. Avoid the removed battery contacting any metallic parts. Any repairs, including
accupack exchange by models with a CO2sensor, may be carried out by suitably instructed
service personnel only. Contact the distributor you have bought the device from.
•Accumulator charging. Only models with internal CO2sensors can be charged. Use the
charger that has been recommended to charge the accumulator. During the charging procedure
the device has to be located in an indoor room with a relative humidity (RH) up to 85 %. The
charging will proceed at an indoor temperature ranging between 0 °C and +40 °C.
•Protection against water and dust. The device will be protected against water and dust only
when all connectors are duly tightened, and the USB connector is provided with a closing cap.
The input connectors that are not used have also to be provided with closing caps.
•Recommended accessories. Use only accessories that are recommended by the producer

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Guide to installation and usage of the device
Installing the datalogger, placing the probes
•Choose a suitable location for installing the device - bear in mind that
the environmental conditions should be concordant with the Operating
conditions. Do not situate the device near sources of electromagnetic
interference.
•Recommended working position - for models with internal humidity
sensor (U3120, U3631, U4130, U3430 and U4440) with USB connector
down, for others any:
•This device may be operated as a portable one. In thiskind of operation
avoid the device falling. Try to maintain the proper working position.
•You can screw the device on the wall or some other solid base

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•You can fix the device on the wall with the aid of a lockable holder
LP100 (optional accessory)
•Probe installation and cable routing - observe the installation
instructions, realize the recommended operating positions, avoid electric-
power distribution systems. See the chapter „MODELS PRODUCED“ for
more information.
•For the U3120, U3631, U4130, U3430 and U4440 device remove any
transport transparent foil from the front panel (otherwise it would prevent
air access to internal sensors)
Device set-up
•Connect the appropriate probes and signal leads to the device. For
more information refer to the chapter „MODELS PRODUCED“.
•Install the COMET Vision software into your computer - is available
for free on the address www.cometsystem.com.
•Run COMET Vision software
•Connect the device to the computer - on the datalogger side, use a
USB cable provided with a USB-C terminal.
•Setting up the device - with the aid of the COMET Vision program, set
up the device identification, the names of the points to be measured, the
recording mode, the alarms and there signalling.
•For more information, refer to the chapter „SETTING-UP THE DEVICE“.

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Running the device
•After the set-up - Disconnect the device from the computer and close the
USB connectorwith a closing cap. Check that all connectors are tightened
properly. The device may be operated with a permanently connected USB
cable. In this case the ingress protection will be reduced to IP 20.
•Operating the device by means of keys - In the main display mode you
can switch over between individual channels and the display mode
Current / minimum / maximum values by means of the keys. By pressing
a certain key combination, you will enter a menu in which you will be able
to switch the device on or off, to delete the Min/Max values and to disable
the alarm signalling. For more information, refer to the chapter
„OPERATING THE DATALOGGER FROM THE KEYPAD“.
•Charging the batteries - applies only to models with a CO2sensor
(contains Li-Ion accupack), other devices cannot be charged. An internal
charger will be activated immediately after connecting the USB charger or
after connecting the datalogger to the computer. The datalogger contains
an intelligent charging circuitry evaluating the battery condition and
internal temperature. Charging time depends on the current battery
discharge status The battery charging process will be initiated only in the
case that the battery voltage is low and the internal temperature ranges
between 0 °C and 40 °C. Use the recommended charger type only. During
the charging period the ingress protection is reduced to IP 20; therefore,
do the charging under room (or similar) conditions only. If the battery is
very low, the charging process may be terminated with an error message.
In such a case contact the datalogger vendor to apply for battery
replacement. During the battery charging period the internal temperature
of the device may be slightly raised, which can, for a short period of time,
adversely influence the measurement values of the internal sensors.
Therefore, the charging speed with the power on is deliberately slowed
down to avoid excessive measurement influence. If you want to charge
the device as soon as possible, turn it off first. When the device is turned
off, the fast charging mode is automatically activated. Fully charged
battery is indicated on the display of the device usually within 6 hours.
•Maintenance and regular checks - for a reliable functioning of the device
it is advisable to perform its regular check-ups. For more details refer to
„RECOMMENDATIONS FOR OPERATION AND MAINTENANCE“.
Device disposal procedure
Screw-off the rear cover of the datalogger, take out the battery. The device
is disposed of as electronic waste. The battery must be disposed of as
hazardous waste.

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Operating the datalogger from the keypad
Displaying the device data
Data memory occupancy - this display section offers information about the
current condition of the free space existing in the data memory. The blinking
of the Memory symbol indicates that the preset memory occupancy limit has
been exceeded. This limit can be set up in the device’s configuration. Several
actions can be assigned to it (optical and acoustic signalling).
The memory occupancy is about 75 %, the device is in the non-
cyclic recording mode, i.e. the recording will be stopped as
soon as the memory capacity is full.
The memory occupancy about 75 %, the device is in the cyclic
recording mode, i.e. as soon as the memory capacity is full, the
oldest data will be overwritten.
The memory occupancy 100 %, the device is in the cyclic
recording mode. The preset memory occupancy limit has been
exceeded (The Memory symbol is blinking).
Record status - offers information on whether the recording is ON and
whether it is just running.

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A continuous recording with a preset interval is ON and running.
The recording is ON in the device and it is running at present. This
kind of display is utilized, when the record activity is dependent on
the alarm or the external input condition.
The recording is ON in the device but it is not running at present.
For instance, the rrecording is ON during an alarm only, and there
is no alarm just now. Or, a recording is ON that is controlled by an
external input which not active at the moment.
The LOG symbol is not displayed: The recording is OFF in the
device. The recording is not allowed in any channel in the device’s
configuration.
Meaning of the values displayed - this item specifies the meaning of the
measured values displayed in the two main rows. Beside the currently
measured values the device will also evaluate the minimum and maximum
values from their last resetting by the user. If the device is OFF and has not
been running for some time, then, after it is turning ON, the value of Min /
Max is then set to the values before switching OFF. It can be preset in the
device configuration, whether and in what manner these Min/Max values
will be displayed by the device. Remember that the Min/Max in question are
different from those being recorded.
Neither MIN nor MAX is displayed. You can see values that
have been currently measured.
In both display rows you can see the minimum values measured
since their last resetting by the user.
In both display rows you can see the maximum values measured
since their last resetting by the user.
Alarm condition - this item provides instant information that at least one of
the alarms which have been preset is active. Alarms can be generated by
exceeding the limits that have been preset in individual channels. Moreover,
they can notify of a device failure. In the device configuration you can preset
which conditions should be considered as alarm generating. By means of the
upper key you can easily browse through the values measured in all device
channels (if enabled in device configuration). In the case that the value is
preceded by a bell-like icon, the preset limits (alarms) have been exceeded
in this channel.

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Battery condition - this symbol provides overview information about the
current battery charging condition. The charging is indicated by flashing one
of these symbols.
Battery conditions during battery operation of the device:
Fully charged battery
Partly discharged battery
Heavily discharged battery
Totally discharged battery, the device will be switched OFF.
Battery conditions with a charger connected to the battery:
Blinking symbol of an empty battery. There was a deep discharge
of the battery, the charger is attempting to recover battery. If this
condition persists for a long time and the standard charging
process is not renewed, contact your service department. The
battery will have to be replaced.
Indications of individual charging steps when the charging
process takes place in a standard way. If the display shows the
symbol of a full battery, the battery is fully charged and the
charger can be disconnected.
A failure has been detected during charging and the charging
process has been broken off. Try to remove the failure by
disconnecting and reconnecting the charger. If the problem
persists, call the service.
Wait, the charger performs internal testing, or the temperature
inside the device is not within the allowed chargingrange (0 to 40
°C).
USB interface active –the icon indicates that the device has been
connected to the computer.
Measured value (upper and lower row) - the currently measured value(s)
(or the Min/Max values) are displayed, if the corresponding symbols in the
upper display section are illuminated. The unit name and the measured value
symbol (1, 2, 3, 4, INT, EXT) are preset by the manufacturer, the user cannot
change them. In addition, it is factory preset whether the measured value of
a particular channel will be displayed in the lower or upper display unit row.
On the other hand, the user has many possibilities to adjust the appearance

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and behaviour of individual „screens“. Controlling them can take place only
manually by the aid of push buttons situated beside the display unit. The
upper push button serves to toggle between the measured values („the
screens“):
The lower push button serves to toggle between the currently measured
values and the Min/Max values:
The device can also be set up to toggle the „screens“ automatically, in for
about 5 sec interval. The cycle can be interrupted by pressing a key. If you
do not want to use the keypad, you can disable it in the device settings.

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Menu Options
The menu can be entered by pressing a combination of both keys. In any
case, using the keypad must be enabled in the device configuration.
Individual menu items, too, may be disabled in the device setup. It is e. g.
possible to switch on the device in this way, but it is not possible to switch it
off.
To enter the menu:
Press the lower key and hold it pressed for about 3 s, until bottom menu line
appeared. Then release this key immediately and shortly press the upper key
during the following 4 s.:
You can now work with individual menu items. Press the upper key to scroll
through the menu items, press the lower key to confirm (SET). After
confirming certain choices, the menu will be quit automatically. If the keypad
is inactive for more than 20 s, the menu will close automatically.
Menu items:
Deactivation of the optical (LED diode) and acoustic alarm
signalling. In the case that the alarm signalling is active, it will be
terminated by generating a new alarm. In the device
configuration it must be allowed to disable this signalling from the
device keypad. If alarm memory (Latched alarms) is ON in the
device, the signalling will be deleted.
Deleting the Min/Max values in the device and it is related only to
values obtained since last reset. This does not concern those
recorded Min/Max values obtained in some other way. Option
must be enabled in the SW device configuration.
Switching the device off. This item is available only if the device
is ON. Option must be enabled in the SW device configuration.
Device switching-on. This item is available only if the device is
OFF. Option must be enabled in the SW device configuration.
Closing the menu.

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Models produced
The models produced differ from one another by types and ranges of values to be
measured. The datalogger’s input channels are invariably assigned to these values. The
user cannot change the type and range of the values to be measured.
U0110 One-channel thermometer
This model is equipped with only one internal
temperature sensor, no additional probes and sensors
can be connected. It is characterized by a simple and
compact design and a relatively long response to a
temperature jump. The device is placed directly in the
measured space. The battery in the device cannot be
charged.
U0111, U0121, U0141 One-, two- or four- channel
thermometer for external probes
This model can measure one, two or up to four
temperature values transmitted by Pt1000/E series
external probes. The response to a temperature jump
depends on the connected probe design. As a rule, this
model is few times faster than that using the inner
sensor. It is often used to monitor locations where the
device itself is not directly in the measuring space and
only probes are in. The maximum length of each probe
lead should not exceed 15 m. It is recommended to use
shielded cables. To maintain the IP rating, the unused
probe connectors should be provided with a supplied
closing cap. The battery in the device cannot be
charged.

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U0122 Two-channel thermometer with external probe
This model allows to measure the temperature of the
internal sensor and one external probe series Pt1000/E.
The response to a temperature jump depends on the
connected probe design but is usually much faster than
the response of the internal sensor. It is often used,
among other things, to monitor large areas where a
device requiring individual monitoring is located. The
maximum length of each probe lead should not exceed
15 m. It is recommended to use shielded cables. To
maintain the IP rating, the unused probe connectors
should be provided with a supplied closing cap. The
battery in the device cannot be charged.
U3120 Compact thermometer - hygrometer
This modelis designed tomeasure temperature, relative
humidity and dew-point temperature by internal sensor,
no additional probes or sensors can be connected. It is
characterized by a simple and compact design and a
relatively long response to a temperature and humidity
jump, compare to model with external probes. The
sensors are located under the grid on the front of the
unit and are protected with Teflonfoil. Foil permits water
vapour but prevents water from permeating the liquid
state. The device is suitable for measuring in places
where there is no rapid change in temperature or
relative humidity, and there is no condensation of water
vapours. If water vapour condensation occurs inside the
datalogger, then the resulting water will remain there
and may damage its electronics. The device is placed
directly in the measured space.The battery in the device
cannot be charged.
It is recommended to calibrate this device in the
laboratory with the unscrewed bottom lid of the box to
allow the air to flow from the back of the electronics.
When air flow in the range of 0.5 - 1 m/s perform reading
after about 4 hours. The closed device reaches a
difference of approximately 2 %RH when inserted in the
humidity chamber, then dramatically slows down.
Precise reading takes many times longer time than with
the open rear lid.

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U3121 Thermometer –hygrometer for external probe
This model measures temperature, relative humidity
and dew point temperature using an outdoor Comet
Digi/E series probe. Its response to the temperature or
relative humidity jump is significantly faster than by
models with internal sensor. This model is often utilized
to monitor areas in which only the probe is installed,
whereas the main unit is installed elsewhere. When
monitoring remote areas, the maximum probe line wire
must not exceed 15 m. The Digi/E series probes provide
calibrated measurement values. Hence, they may be
replaced without having to modify the device setup.
The battery in the device cannot be charged.
U3430 Compact thermometer –hygrometer - CO2
concentration meter
This modelis designed tomeasure temperature, relative
humidity, dew-point temperature and the concentration
of CO2in the air by internal sensors. Barometric
pressure can be measured as absolute or recalculated
to sea level. No additional probes or sensors can be
connected. It is characterized by a simple and compact
design and a relatively long response in the measured
quantities, compare to model with external probes. The
sensors are located under the grid on the front and side
of the unit The device is suitable for measuring in places
where there is no rapid change in temperature or
relative humidity, and there is no condensation of water
vapours. The device is placed directly in the measured
space, Accupack in the device can be charged.
As the internal battery creates a parasitic heat during the
charging period, the measurement accuracy may be
affected by up to 1 º C. In battery mode, this model has
significantly shorter battery life than models without CO2
concentration measurement. For this reason, the
measurement of CO2concentration does not occur as
often as the measurement of other variables. By default,
this is 2 minutes with the option of extending up to 10
minutes (option available in the COMET Vision SW).
We recommend calibration of the relative humidity and
temperature in the laboratory with the unscrewed
bottom lid of the box to allow the air to flow from the back
of the electronics. When air flow in the range of 0.5 - 1
m/s perform reading after about 4 hours.
Due to low IP20 protection, this device is not suitable for
dusty or water-borne areas.

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U3631 Compact thermometer –hygrometer with optional
external temperature probe
This modelis designed tomeasure temperature, relative
humidity and dew-point temperature by internal sensor,
moreover one additional external temperature probe
Pt1000/E can be connected. Internal sensors are
located under the grid on the front of the unit and are
protected with Teflon foil. Foil permits water vapour but
prevents water from permeating the liquid state. The
device also measures the temperature from an external
probe and the difference between this temperature and
the dew point temperature. If the surface temperature of
the material is measured by an external probe, the risk
of condensation of water vapor on the surface to be
measured can be determined immediately. The device
alone is suitable for measuring in places where there is
no rapid change in temperature or relative humidity, and
there is no condensation of water vapours. If water
vapour condensation occurs inside the datalogger, then
the resulting water will remain there and may damage
its electronics. The device is placed directly in the
measured space. The battery in the device cannot be
charged.
It is recommended to calibrate this device in the
laboratory with the unscrewed bottom lid of the box to
allow the air to flow from the back of the electronics.
When air flow in the range of 0.5 - 1 m/s perform reading
after about 4 hours. The closed device reaches a
difference of approximately 2 %RH when inserted in the
humidity chamber, then dramatically slows down.
Precise reading takes many times longer time than with
the open rear lid.
The maximum length of each probe lead should not
exceed 15 m. It is recommended to use shielded cables.
To maintain the IP rating, the unused probe connector
should be provided with a supplied closing cap.

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U4130 Compact thermometer - hygrometer - pressure
gauge
This modelis designed tomeasure temperature, relative
humidity, dew-point temperature and barometric
pressure by internal sensors. Barometric pressure can
be measured as absolute or recalculated to sea level.
No additional probes or sensors can be connected. It is
characterized by a simple and compact design and a
relatively long response in the measured quantities,
compare tomodel with external probes. The sensors are
located under the grid on the front and side of the unit
The device is suitable for measuring in places where
there is no rapid change in temperature or relative
humidity, and there is no condensation of water
vapours. The device is placed directly in the measured
space. The battery in the device cannot be charged.
It is recommended to calibrate this device in the
laboratory with the unscrewed bottom lid of the box to
allow the air to flow from the back of the electronics.
When air flow in the range of 0.5 - 1 m/s perform
reading after about 4 hours. The closed device reaches
a difference of approximately 2 %RH when inserted in
the humidity chamber, then dramatically slows down.
Precise reading takes many times longer time than
with the open rear lid.

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U4440 Compact thermometer –hygrometer - pressure
gauge - CO2concentration meter
This modelis designed tomeasure temperature, relative
humidity, dew-point temperature, barometric pressure
and the concentration of CO2in the air by internal
sensors. Barometric pressure can be measured as
absolute or recalculated to sea level. No additional
probes or sensors can be connected. It is characterized
by a simple and compact design and a relatively long
response in the measured quantities, compare to model
with external probes. The sensors are located under the
grid on the front and side of the unit The device is
suitable for measuring in places where there is no rapid
change in temperature or relative humidity, and there is
no condensation of water vapours. The device is placed
directly in the measured space. Accupack in the device
can be charged. As the internal battery creates a
parasitic heat during the charging period, the
measurement accuracy may be affected by up to 1 º C.
In battery mode, this model has significantly shorter
battery life than models without CO2concentration
measurement. For this reason, the measurementof CO2
concentration does not occur as often as the
measurement of other variables. By default, this is 2
minutes with the option of extending up to 10 minutes
(option available in the COMET Vision software).
We recommend that calibration of this device in the
laboratory be carried out with sufficient air flow (at least
1 m/s), but the reading should be carried out only after
a thorough settling, which may take up to 4 hours.
Due to low IP20 protection, this device is not suitable for
dusty or water-borne areas.