Comet System LOGGER S3121P User manual

LOGGER S3121P
Temperature and relative humidity logger with external probe
for compressed air measurement
Instruction Manual

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Instruction manual for use of temperature and RH logger S3121P
Logger is designed for measurement and record of temperature and relative humidity of the
compressed air. Measuring sensors of temperature and humidity are built-in a probe connected to
logger by a cable. 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).
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. If data logger is in cyclic logging
mode, data from latest period is possible to download to shorten
download time essentially (e.g. only last 24 hours).
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).
The sensing element of the device is an external probe (see
picture) designed for compressed air measurement up to 25 bars. The
probe has a cable (length of 1 to 4 meters) with connector. Mechanical
connection of the probe is threaded G1/2 with O-ring seal. It is good to
mount probe directly into high pressure area (i.e. air pressured pipe) if
it is possible. There is other possibility to use flow chamber SH-PP,
see Appendix A.
The probe is an noninterchangeable part of the device.
Before you remove probe, make sure that the pressure in a pressure chamber (duct, pipe…)
and the ambient pressure are in equilibrium!
Read instruction manual before the first device connection, please.

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Technical parameters:
Measuring parameters:
Temperature (RTD sensor Pt1000/3850ppm):
Measuring range: -30 to +105 °C
Resolution: 0.1 °C
Accuracy: ± 0.4 °C from –30 to +80°C, ± 0.5 °C over +80°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 +105 °C
Resolution: 0.1 °C
Accuracy: ±1.5 °C at ambient temperature T<25ºC and relative humidity
RH>30 %, for more details see graphs below.
Response time with stainless steel mesh cover (air flow approximately 1 m/s):
air temperature: t90 < 16 min (temperature step 20 °C)
relative humidity: t90 < 30 s (humidity step 65 %RH, constant temperature)
Measuring interval, alarm evaluation, MIN/MAX memory update and display refresh:
default setting: 10 s
low power mode: 1 min
Logging interval:
default setting: 10 s to 24 h
low power mode: 1 min to 24 h
Total memory capacity:
for non cyclic mode 16 252 T+RH readings
for cyclic mode 15 296 T+RH readings

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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 optical
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: 2,5 years
Protection: electronics IP67, sensors are protected by a cover with IP40 protection
Operational conditions:
Operational temperature range: instrument -30 to +70 °C, external probe –30 to +105°C
Operational humidity range: 0 to 100 %RH
Operational pressure range of the probe: up to 25 bar
Air flow velocity: up to 25 m/s at a pressure of 1 bar (1m/s at a pressure of 25 bar)
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 –logger without probe: temperature -40 to +70 °C, humidity 0 to 100 %RH
Storing condition: temperature -40 to +85 °C, humidity 0 to 100 %RH
Mechanical connection of the probe: G1/2 with O-ring
Dimensions of the logger without connector and probe: 93 x 64 x 29 mm
Dimensions of the external probe: see dimensional chart (default cable length 1 meter)
Weight including battery without probe: approximately 115 g
Material of the case: ABS
Material of the probe: duralumin with the black eloxal surface finish
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. Free user program is available to
download at www.cometsystem.cz . 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. Connecting logger to the computer by means of
communication adapter
Notice: USB connector can be located also from the computer front side

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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
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.
External probe is
calibrated with logger and
it is not possible to
interchange it for another
of the same type!
Operational range of
the external probe is
limited for temperature
over +85°C accordingly to
the graph and must not be
exceeded.

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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%).
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
ON.
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, do not remove magnet
from guide slots before decimal point symbol goes out –logger would be switched OFF! Display
reading initialized by magnet goes out automatically after 30 s. Remove magnet from slots anytime
during actual reading is ON or later.

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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!

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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.
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.

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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. 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:
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. 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:
radiation: EN 55011 Class B
immunity: 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)
Technical support and service
Technical support and service is provided by distributor. For contact see warranty certificate.

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APPENDIX A
The probe for measuring the moisture of compressed air should be placed directly on the
pressure pipelines to achieve higher measurement accuracy and fast response times. But they are
cases where such placement is not possible. The reason is the high air speed, high temperature, high
pollution, small diameter pipes, etc. Such situation can be solved by placing the probe into the flow
measuring chamber. The picture shows the basic layout of the sampling system with chamber
SH- PP.
1 ….sampling
2 ….closing valve
3 ….probe
4 ….flow chamber SH-PP
5 ….closing valve
6 ….outlet tube
sampling (1) - end of the tube placed in the centre of pressure pipelines (distribution of moisture in
the pipe cross-section is not homogeneous). To achieve fast response times to shorten the length
of the sample tubes to a minimum (few meters).
closing valve (2) - allows access to the sample system without interrupting the main line
closing valve (5) - the sample flow is regulated by this valve. Measurement accuracy is typically not
affected by the sample flow rate, but at low speeds, increasing response time.
outlet tube (6) - if the measured sample of air is released into the atmosphere, select the length of
the outlet tube of 1.5 m (recommended for tube diameter 6mm). The reason is to ensure the
accuracy of the sample in the flow chamber and avoid back diffusion of moisture from the
ambient air..
That basic structure of sampling system can be supplemented with filters, coolers, flow
measurement, pressure measurement, etc. For the accurate operation of sampling system is
important to ensure perfect tightness of all connections and
to use corrosion-resistant materials. Tube inclination is
chosen so as to avoid the accumulation of fluid in the
system.
Technical specification –flow chamber SH-PP
Material of flow chamber: stainless steel
(DIN 1.4301)
Inlet and outlet connection: G1/8
Probe connection: G1/2
Sample flow rate: 0.1 to 3 l/min
Operating pressure: up to 25 bar
Weight: 580 g
Note: Screw-coupling not included