Comet U0110M User manual

www.cometsystem.com
User‘s Guide
U0110M
U0141M
U3120M
U3121M
U3631M
U4440M
U0843M
U6841M
U7844M
GSM modem dataloggers

2IE-LGR-UxxxxM-05
© 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
Inserting the SIM card into the device...........................................7
Installing the datalogger, placing the probes.................................8
Device set-up..............................................................................10
Running the device.....................................................................10
Device disposal procedure..........................................................11
OPERATING THE DATALOGGER FROM THE KEYPAD........................12
Displaying the device data..........................................................12
Menu Options .............................................................................16
MODELS PRODUCED.............................................................................17
U0110M One-channel thermometer............................................17
U0141M Four- channel thermometer for external probes............17
U3120M Compact thermometer - hygrometer.............................18
U3121M Thermometer –hygrometer for external probe..............18
U3631M Compact thermometer –hygrometer with optional
external temperature probe.........................................19
U4440M Compact thermometer –hygrometer - pressure gauge -
CO2 concentration meter............................................20
U0843M Two-channel binary-input thermometer for external
probes.........................................................................21
U6841M Datalogger with 3 inputs 0 - 20 mA and 1 binary input..22
U7844M Two-channel binary-input counter.................................23
COMET VISION PROGRAM....................................................................24
SETTING UP THE DEVICE......................................................................25
How to set up the device by means of a program........................25
The device setup from a program (Configuration).......................25
APPLICATION NOTES.............................................................................33
RECOMMENDATIONS FOR OPERATION AND MAINTENANCE...........36
TECHNICAL PARAMETERS....................................................................39
Power supply..............................................................................39
USB communication interface.....................................................40
Measurement, data storage and real time circuitry......................40
Radio section..............................................................................40
Parameters of datalogger inputs.................................................41
Operating and storage conditions ...............................................49
Mechanical properties.................................................................50
Declaration of conformity ............................................................50
ANNEXES................................................................................................51
Annex 1: Selected error messages of the device ........................51
Annex 2: Connection of the Pt1000/E series probe connector ...52
Annex 3: Connection of the Digi/E probe connector...................53
Annex 4: Accuracy of the dew-point temperature measurement 53
Annex 5: Connecting block ........................................................53
Annex 6: SMS message format...................................................54
Annex 7: Firmware updates........................................................57

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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 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. In addition,
all UxxxxM series dataloggers contain a GSM modem enabling to send
alarm SMS messages to up to four selected receivers and can send
values over a GPRS data connection using JSON messages when
changing the alarm status.
- to send, at a configurable interval , informative SMS messages containing
device identification, currently measured values and alarm states to up to
four selected receivers. These messages may be of two kinds: user
readable (suitable to be displayed on a mobile phone), or machine
readable (suitable for automated data processing in a database or a
cloud).
- In configurable interval to send measured values over a GPRS data
connection using JSON messages
- to be supplied in autonomous manner from an internal Li-ion accumulator.
This can be charged by a common USB charger. An internal GSMmodem
is connected to the supply unit only when a sending request has been
sent out, otherwise it is switched off to save energy.
- to communicate with a computer by means of a USB interface (all device
settings, recorded data downloading, and online monitoring). To

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communicate, the datalogger utilises the HID USB standard, which does
not require additional controllers to be built into the PC.
General view of a UxxxxM series datalogger (U0141M model):
Dimensional drawing:

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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!
•Legislative conditions. This datalogger contains a radio transmitter working in GSM frequency
bands and using power values that are shown in its Technical parameters. These bands and
power values are used in the countries of the European Union. Before the first setting the device
in operation make sure that you are allowed to operate the device if you reside in a locality
outside the EU.
•Electromagnetic interference. Do not use the device in an area where the usage of mobile
phones is limited, e. g. near sensitive medical apparatus, on board a plane or in localities where
explosive materials are used.
•Operating and storage conditions. Observe the recommended operating and storage
condition as quoted in the Technical parameters. This datalogger makes use of an internal Li-ion
rechargeable battery. Be particular about the device‘s not being exposed to temperatures higher
than 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. After inserting the SIM card
check the integrity of the sealing. Screw the device together by using the original screws.
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 wateraffected areato a safefire-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. Any repairs including battery
exchange may be carried out by suitably instructed service personnel only. If the device shows
signs of unusual behaviour, screw off the rear cover to disconnect the battery connector. Avoid
the removed battery contacting any metallic parts. Contact the distributor you have bought the
device from.
•Accumulator charging. 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.
•Serviceability. This device makes use of the wireless communication and the GSM network.
For this reason, the connection (SMS, GPRS, etc.) cannot be guaranteed always and under any
circumstances. Do not rely merely on wireless equipment if crucial communications must be
realized (rescue systems, safety systems). Bear in mind that redundancy is indispensable for
systems featuring high functional reliability. See e.g. IEC 61508 for more information.
•Recommended accessories. Use only accessories that are recommended by the producer

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Guide to installation and usage of the device
Inserting the SIM card into the device
•Get a suitable SIM card ready –a micro-sized SIM card can be inserted
into the device. If a nano-sized card is at your disposal, you will have to
obtain a reducing adapter to the micro-sized SIM. The SIM card must be
allowed to send SMS messages.If the SIM card is safeguarded bymeans
of a PIN code, note and save this code to enter it into the device
configuration. Select such a tariff that meets your requirements
concerning thequantity and safetyof the messagedelivery. In some tariffs
the message delivery may be stopped when a certain number of
messages is exceeded or when a given time period has elapsed. Make
sure the device is turned off. Turn it off if necessary.
•Screw off the rear cover of the device –caution, the device is constantly
supplied from the internal battery. Proceed with care. Prevent external
conductive parts from contacting electronics components when
manipulating the device without the back cover installed.
•Insert the card into the SIM card holder
•Removing the card from the SIM card holder

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•Screw up the rear cover of the device
- at first check the seal in the nut for
integrity, then screw down the lid with the
aid of four self-cutting screws.
ATTENTION –tighten screws gradually
and with feeling!
GSM module status (blue LED
indication)
LED state Module Function
.
Off The module is not running
64ms On / 800ms Off The module is not synchronized with network
64ms On / 2000ms Off The module is synchronized with network
64ms On / 600ms Off The GPRS data transmission after dialling the
PPP connection
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
- the aerial is supposed to point
upwards:
•Check the availability and quality of the GMS signal in the aerial
location - use a mobile phone utilizing a SIM card of the same operator
as that of the datalogger. Search another installation location if the signal
quality is not satisfactory. It is especially in iron concrete constructions,
cellars, metal chambers or other shielded rooms that the GMS signal may
be insufficient.

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•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
•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 U3120M, U3631M and U4440M device remove any transport
transparent foil from the front and side panel (otherwise it would prevent
air access to internal sensors)

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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. If a PIN code is set on
your SIM card, be sure to set it in the Configuration-Modem-General
section before using the logger for the first time, the default setting is No
PIN code.
•For more information, refer to the chapter „SETTING-UP THE DEVICE“.
Running the device
•After the set-up - Disconnect the device from the computer and close the
USB connector with a closing cap. Check that al connectors, including the
aerial connector are properly tightened. The device may be operated with
a USB cable that is permanently connected to a computer or to a charger.
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 - 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. 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 beterminated with an error message. In such acase 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.

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•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, disconnect the battery connector
and take out the battery. The device is disposed of as electronic waste. The
battery must be disposed of as hazardous waste. Remember there can be
a SIM card inside the device.

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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, sending SMS
messages).
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 its turning ON, it will re-assume the
evaluating procedure of the Min/Max values in continuation to the
evaluating them before its turning 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.
GSM modem active - this symbol indicates that a power supply has been
connected to the GSM modem because of some online work.

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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 charging range
(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.
Display warnings: Displayed when no SIM card is inserted
Displayed if the card requires you to enter the
PUK code. This condition may occur e.g. if a
PIN is activated on the SIM, but PIN code
stored in the device configuration is not valid.
The SIM card requires a PIN code, but the
PIN is not set/enabled in the SW configuration
(Default).

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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. If GSM
communication is used, it is necessary to pay attention to a sufficient level of GSM signal
at the location.
U0110M 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. During the charging period the
measurement accuracy may be affected by up to 1 °C
due to parasitic heat.
U0141M Four- channel thermometer for external probes
This model can measure 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 isrecommended to useshielded cables.
To maintain the IP rating, the unused probe connectors
should be provided with a supplied closing cap.

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U3120M 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 Teflon foil. 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, while the installation
needs to ensure sufficient level of GSM signal at the
installation location. As the internal battery creates a
parasitic heat during the charging period, the
measurement accuracy may be affected by up to 1 º C.
The calibration of this instrument in the laboratory is
recommended with the open bottom part of the battery
box, to allow airflow from the back of the electronics.
When airflow in the range 0.5 –1 m/s, read the value
after approx. 4 hours. The closed device reaches a
difference of approximately 2% when inserted in the
humidity chamber, then dramatically slows down.
Precise reading takes many times longer time than with
the open rear lid.
U3121M 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 30 m. The Digi/E series probes provide
calibrated measurement values. Hence, they may be
replaced without having to modify the device setup.

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U3631M 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, while the installation needs to ensure
sufficient level of GSM signal at the installation location.
As the internal battery creates a parasitic heat during the
charging period, the measurement accuracy may be
affected by up to 1 º C. The calibration of this instrument
in the laboratory is recommended with the open bottom
part of the battery box, to allow airflow from the back of
the electronics. When airflow in the range 0.5 –1 m/s,
read the value after approx. 4 hours. The closed device
reaches a difference of approximately 2% 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.
temperature and relative
humidity sensor
external temperature
probe input

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temperature and relative
humidity sensor
CO2 and barometric
pressure sensors
U4440M 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, while the installation
needs to ensure sufficient level of GSM signal at the
installation location. 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 measurement of 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 Vision software).
We recommend that calibration of the relative humidity
and temperature of this device in the laboratory be
carried out with sufficient air flow (at least 1 m / s), but
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.