Instruction Manual for S3120 logger
Temperature and relative humidity logger with display
Instruction Manual
Instruction manual for use of temperature and RH logger S3120
Logger is designed for measurement and record of ambient temperature and relative humidity.
Measuring sensors of temperature and humidity are attached to logger. Measured values including
calculated dew point temperature are displayed on the two-line LCD display and are stored in
selectable time interval to internal nonvolatile memory. All logger control and setting are performed
from the PC and password is applicable. It is enabled to switch ON and OFF the logger by delivered
magnet (this possibility can be in configuration disabled). It is also enabled to program automatic
start in certain day and time (for one month forward). Start/stop magnet enables also to clear the
minimum and maximum value memory.
Minimum and maximum measured values can be displayed (display switches to actual
measured values and min/max values automatically). It is also possible to operate logger with
switched OFF display. Short display of actual measured values is enabled by means of magnet.
Switched ON logger every 10 seconds (independently on logging interval) updates MIN/MAX
memory, compares measured values of each quantity with two adjustable limits for each quantity
and exceeding of limits is indicated on the display (alarm function). Also memory alarm mode is
selectable, when alarm is indicated permanently till alarm memory reset. Alarm function is enabled
or disabled for each quantity individually.
Logging mode can be adjusted as non-cyclic, when logging stops after filling the memory. In
cyclic mode oldest stored values are overwritten by new. In addition logging mode can be selected
when logging is active only if measured value is out of adjusted alarm limits.
Stored values can be transferred from logger memory to the PC by means of communication
adapter. Communication adapter can be connected to the logger permanently – data logging is not
interrupted even if data download appears.
Logger evaluates minimum battery voltage and its drop below allowed limit is indicated on the
display. At the same time value of remaining battery capacity is available by means of the PC
program and appears on the logger LCD in % (every time after switch ON).
Technical parameters:
Measuring parameters:
Ambient temperature (RTD sensor Pt1000/3850ppm):
Measuring range: -30 to +70 °C
Resolution: 0.1 °C
Accuracy: ± 0.4 °C
Relative humidity (reading is temperature compensated at entire temperature range):
Measuring range: 0 to 100 %RH
Resolution: 0.1 %RH
Accuracy: ± 2.5 %RH from 5 to 95 %RH at 23 °C
Dew point (value calculated from temperature and humidity):
Range: -60 to +70 °C
Resolution: 0.1 °C
Accuracy: ± 1.5 °C at ambient temperature T < 25°C and RV > 30 %, for
more details see Appendix A
Response time with plastic sensor cover (air flow approximately 1 m/s):
temperature: t63 < 2 min, t90 < 8 min (temperature step 20 °C)
relative humidity: t63 < 15 s, t90 < 50 s (humidity step 30 %RH, constant temperature)
Measuring interval, alarm evaluation and MIN/MAX memory update:
standard mode (no low-power mode): every 10 s
low-power mode: every 1 minute
Logging interval to memory:
standard mode: 10 s to 24 h (20 steps)
low-power mode: 1 minute to 24 h (17 steps)
Memory capacity:
for non cyclic mode
16 252
for cyclic mode
15 296
Specified values are maximum possible and can be reached only if record is not interrupted
(since last memory erasing)
Communication with computer: via RS232 (serial port) by means of COM adapter or USB
port by means of USB adapter; data transfer from logger via communication adapter is
Real time clock: adjustable from computer, integrated calendar including leap years
Error of internal RTC: < 200 ppm (i.e. 0.02 %, 17.28 s in 24 h)
Power: Lithium battery 3.6 V size AA
Typical battery life:
standard mode (data download to the PC approximately once a week): 2.5 years
low-power mode (data download to the PC approximately once a week): 6 years
on-line mode with interval 1 minute: min. 1.5 years
on-line mode with interval 10 seconds: min. 1 year
Notice: the above lives are valid if logger is operated at temperature from -5 to +35°C. If
logger is operated often outside of the above temperature range life can be reduced to 75%
Protection: electronics IP67, sensors are protected by a cover with IP30 protection
Operational conditions:
Operational temperature range: -30 to +70 °C
Operational humidity range: 0 to 100 %RH
Specification of outer characteristics accordingly to Czech National Standard 33-2000-3:
normal environment accordingly to appendix NM: AE1, AN1, AR1, BE1
Operational position: negligible
Logger installation: by self adhesive Dual Lock, applied to clean, flat surface
Not allowed manipulation: it is not allowed to remove sensor cover and mechanically
damage sensor under cover. Sensors of temperature and humidity should not get to
direct contact with water or other fluids.
Limit condition: temperature -40 to +70 °C, humidity 0 to 100 %RH
Storing condition: temperature -40 to +85 °C, humidity 0 to 100 %RH
Dimensions: 93 x 64 x 29 mm
Weight including battery: approximately 115 g
Material of the case: ABS
Logger operation
Logger comes complete with
installed battery and switched OFF.
Before operation it is necessary by
means of installed user PC software to
set logging parameters and other
features. For communication with the
PC a communication adapter is
necessary (not included in delivery). For
connection via RS232 serial port it is
necessary to use COM ADAPTER, for
connection via USB port it is necessary
to use USB ADAPTER. Connect adapter connector to proper computer port and plug the adapter to
the guide slots on the side of logger.
Notice: USB connector can be located also from the computer front side
After connecting the logger to the computer reading of logger info is enabled by means of the
PC software and also setting of the instrument accordingly to the user needs (menu Configuration /
Setting of instrument parameters). Before logging start it is necessary:
check or optionally set the logger real time clock
select suitable logging interval
select logging mode (cyclic or non cyclic)
switch ON the logger (or switch OFF, if it is about to be switched ON by magnet or
automatically with delayed start)
enable or disable the option to switch ON the logger by magnet
enable or disable the option to switch OFF the logger by magnet
enable or disable the option to clear minimum and maximum value memory by magnet
set date and time of logger automatic switching ON logger or disable this option
select if record runs permanently or only if alarm is active
If alarms are about to be applied, set both limits for each measured quantity and enable alarm
optionally enable permanent alarm indication (alarm with memory)
switch ON or switch OFF display logger
optionally switch ON displaying of MIN/MAX values on the LCD
reset memory of MIN/MAX values (if needed)
check free space in data memory, optionally erase data memory of the logger
enter password if protection against unauthorized manipulation with the logger is necessary
Logging interval between to subsequent measurements is specified by the user. Memorizing of the
first value is synchronized with the internal real time clock, so the logging is performed at sharp
multiples of minutes, hours and days. E.g. after starting the logging with the 15 minute interval the
first value is not stored immediately, but after the internal clock gets the status of a quarter, a half or
a whole hour. After starting the logging with the 6 hour interval the first value is stored at that
whole hour to perform the storing also at 00.00, i.e. at the beginning of the day. First storing is
performed at 6.00,12.00, 18.00 or 00.00hour - at the hour from the above nearest to the logging
start. After communication with computer or after start by magnet logger automatically waits for the
nearest whole multiple of time and then first measurement is performed. This is also necessary to
take into account when setting time of automatic logger switch ON.
Notice: If logger operates as permanently connected to the computer, using of magnet start/stop
is disabled.
To enable the logger control by magnet is suitable only in cases, when possibility of
unauthorized manipulation to the logger operation is eliminated.
Reading on the display in usual operation (logger switched ON)
After switching ON the logger all LCD symbols are displayed for checking
the display.
Then actual date and time in logger is displayed for approximately 4 s.
Consequently reading of estimated remaining battery capacity for
approximately 2 s is displayed (values 0 to 100%). It is valid if logger is
operated at temperature from -5 to +35°C. If logger is operated often outside
of the above temperature range battery life can be reduced to 75%, i.e. if
displayed remaining battery capacity drops below 25%, it is recommended
to replace the battery.
If display is switched ON, actual reading of measured values is displayed ambient temperature (°C) on the LCD upper line, relative humidity (%RH)
on the LCD lower line. Symbol LOG indicates data logging in progress – if
it blinks, data memory is filled up to more than 90%.
Every 5 s display is automatically switched to displaying of other measured
or calculated quantity.Logger now displays ambient temperature and dew
point temperature (LCD line marked by symbol DP).
Switched ON logger permanently (with 10 s interval) updates memory of
minimum and maximum values of each measured (or calculated) quantity. If
displaying of MIN/MAX values is selected, minimum measured values are
displayed step by step (indicated by symbol MIN) and then similarly
maximum measured values of all quantities (indicated by symbol MAX).
The entire cycle is repeated periodically, i.e. reading of actual measured
values follows.
If display is switched OFF, all above readings are displayed up to
estimated remaining battery capacity and then display goes out. If logger is
switched ON symbol LOG is displayed (it blinks if memory occupation is
higher than 90%).
If display is OFF and logger is in mode when record runs only when alarm is
active, the LOG symbol is replaced by adjacent symbol "–" (hyphen). It
appears in case, all measured values are inside of adjusted alarm limits and
data logging therefore does not run. Displayed symbol indicates logger is
If information on actual measured values is needed, it is possible anytime to display reading
display by means of the magnet (only if communication adapter is not connected permanently). Plug
magnet into guide slots from logger front side for approximately 4 s and wait till reading on the
display appears. If logger has enabled the function switch OFF by magnet, resp. MIN/MAX memory
clear by magnet, do not remove magnet from guide slots before decimal point symbol goes out –
logger would be switched OFF, resp. MIN/MAX memory would be cleared! Display reading
initialized by magnet goes out automatically after 30 s. Remove magnet from slots anytime during
actual reading is ON or later.
Temporary displaying of actual reading by magnet
Alarm indication on the display
It is necessary to enable alarm function from the PC and set for each quantity lower and upper
limit. If measured value is inside of set limits, alarm of proper quantity is not active. If value of
measured quantity gets outside of set limits, alarm of proper quantity is active and it is indicated on
the display. It is possible to select "memory alarm mode" when alarm is indicated permanently up to
reset from the PC.
Active alarm is indicated (if display is ON) by blinking of the value of
proper quantity on the display and arrow symbol appears at the LCD upper
side at the same time. Arrow 1 indicates active alarm for ambient
temperature, arrow 2 relative humidity and arrow 4 dew point temperature.
Notice: if logger is operated at low temperature (below approximately
-5 °C), alarm indication by blinking can be indistinct. Indication by arrows
works correctly.
Messages displayed on the LCD beyond usual operation
If measured value is out of the measurable or displayable range numeric
reading is replaced by hyphens.
If memory is totally full filled in non-cyclic logging mode, logger is
switched OFF and message MEMO FULL appears on the LCD. It appears
also if logger is operated with switched OFF display.
New initialization of logger can occur in switching ON the logger
(immediately after displaying of all LCD segments for checking) e.g. after
replacement of totally discharged battery for new one. State is indicated by
INIT reading. It can be displayed for about 12 s.
If battery voltage drop occurred since last internal clock setting below
critical limit or battery disconnection for longer period than approximately
30 s, after display switch ON (during date and time display) all four arrows
appears as warning to check or set it again from the computer. However all
logger functions work without limitation.
If reading BAT is displayed periodically on LCD upper line (for 1 s with 10
s interval), the end of estimated battery life is coming – however logger
functions are not limited. Replace battery as soon as possible!
If reading BAT is displayed permanently, battery voltage is low and logger
is not possible to switch ON. If logger was switched ON before it, data
logging is stopped and logger is switched OFF. Communication
with computer can temporarily work. Replace battery as soon as possible!
Start / stop by magnet
The function must be enabled from the PC before. If only switching OFF by magnet is enabled,
it is of course necessary to switch ON the logger from the computer.
Notice: It is not possible to combine function switching OFF by magnet and MIN/MAX
memory clear by magnet! User software enables only one of them to select.
Switching the logger ON by magnet
Plug magnet to guide slots from logger front side and wait approximately 1 s for decimal point
appears right on LCD upper line. After appearance it is necessary immediately (till indication point
is displayed) to remove magnet from guide slots and logger switches ON.
Switching the logger OFF by magnet
The procedure is identical with the above procedure for switching ON. If decimal point does
not appear after 1 s, it is necessary remove the magnet and repeat the procedure.
Reset of MIN/MAX values by magnet
Function enables to clear MIN/MAX values by magnet without using computer. It is necessary
to enable the function from the PC software before.
Notice: It is not possible to combine this function with function of switching logger OFF by
magnet! User software enables to select only one of them (or none).
Plug magnet to guide slots from logger front side and wait approximately 1 s for decimal point
appears right on LCD upper line. After decimal point appearance it is necessary immediately (till
indication point is displayed) to remove magnet from guide slots. Reading CLR MIN MAX appears
for several seconds and MIN/MAX values will be cleared.
Battery replacement
Low battery is indicated on the display by blinking of reading "BAT". It can be displayed
permanently, if battery voltage is too low. Replace the battery for new one. If logger is operated
often in temperature below -5°C or over +35°C and PC program indicates remaining battery
capacity below 25% it is also recommended to replace the battery. Applied is Lithium battery 3.6 V,
size AA. Battery is located under logger lid.
Warning: near battery fragile glass reed contact is located – be careful not to damage it. Be
careful in battery replacement!
Replacement procedure:
switch off the logger by the PC program or by magnet (if low battery allows)
unscrew four corner screws and remove the lid
remove old battery by pulling the glued tape
insert new battery respecting the correct polarity (see symbols + and – near battery holder). If
you connect new battery up to 30 s, all logger settings remain unchanged. In the opposite case
check by means of PC program all settings, especially the real time clock in logger. Attention,
inserted battery with incorrect polarity causes logger damage!
put the lid back again and screw four screws. Be careful to have the rubber sealing properly in the
slot and tighten the screws properly to ensure the water resistance of the instrument.
connect logger to the computer and write to it the information on battery replacement
(menu Configuration/Battery replacement). This step is necessary to evaluate properly the remaining
battery capacity.
Old battery or logger itself (after its life) is necessary to liquidate ecologically!
Instrument passed through tests of electromagnetic compatibility (EMC):
Device conforms in accordance with EN 61326-1 these norms:
EN 55011 Class B
EN 61000-4-2 (levels 4/8 kV, Class A)
EN 61000-4-3 (intensity of electric field 3 V/m, Class A)
EN 61000-4-4 (levels 1/0.5 kV, Class A)
EN 61000-4-6 (intensity of electric field 3 V/m, Class A)
Appendix A - Accuracy of dew point measurement
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