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Instruction manual
Commeter D3121
Digital thermometer-hygrometer and datalogger
2 IE-COM-D3121-13
Table of contents
GENERAL DESCRIPTION ............................................................................................................. 3
TECHNICAL PARAMETERS .......................................................................................................... 4
Measured and calculated values ............................................................................................ 4
General .................................................................................................................................. 5
Operation conditions .............................................................................................................. 6
Dimensions ............................................................................................................................ 7
OPERATION OF THE DEVICE ....................................................................................................... 8
Switching ON and OFF the device ......................................................................................... 8
Displaying of actual measured values .................................................................................... 8
Function HOLD (storing of actual measured values) and minimum a maximum memory ....... 9
Functions and settings available from menu .......................................................................... 9
Alarm indication and setting ................................................................................................. 11
LOGGING MODE ......................................................................................................................... 12
Logging start from device keyboard ..................................................................................... 12
Logging start with clearing memory and logging mode selection .......................................... 13
Logging stop from keyboard ................................................................................................. 14
CONNECTION OF THE DEVICE TO A PERSONAL COMPUTER ............................................... 15
THE PC SOFTWARE FOR THE DEVICE ..................................................................................... 16
Installation of program for PC with OS Windows .................................................................. 16
Software for Windows – instruction manual ......................................................................... 16
BATTERY REPLACEMENT .......................................................................................................... 18
TECHNICAL SUPPORT AND SERVICE ...................................................................................... 19
IE-COM-D3121-13 3
General description
Instrument is designed for measurement and logging temperature and relative humidity with the
possibility of displaying the dew point temperature. Measured values are displayed on a dual line
LCD display and it is possible to store values into the non volatile memory. Then it is possible to
transfer data to a personal computer. Temperature is measured by RTD sensor Ni1000/6180ppm.
Instrument compares measured values of temperature, humidity and dew point with two adjustable
levels for each measured quantity. Breaking the level is indicated by blinking the proper value on
display and by audio indication (switchable). Instrument is equipped with minimum and maximum
memory and Hold function. Minimum and maximum values and Hold value are possible to display
on the LCD anytime.
4 IE-COM-D3121-13
Technical parameters
Measured and calculated values
Temperature:
Measuring range: -30 to +105 °C
Resolution: 0.1 °C
Accuracy: ±0.4 °C
Response time t90 < 3 min with plastic sensor cover without filter
t90 < 8,5 min with plastic sensor cover with stainless filter
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Air flow approximately 1m/s, temperature step 20 °C
Relative humidity:
Measuring range: 0 to 100 %RH
Resolution: 0.1 %RH
Accuracy: ± 2.5 %RH from 5 to 95 %RH at 23 ºC
Response time: t90 < 1 min with plastic sensor cover without filter
t90 < 1 min with plastic sensor cover with stainless filter
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Air flow approximately 1m/s, humidity step 30 %RH, constant temperature
Dew point temperature:
Measuring range: -60 to +80 ºC
Resolution: 0.1 ºC
Accuracy: ±1.5 °C at temperature T<25 °C and RH>30%
(for more details see graph)
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General
Measuring interval and display reading refresh approximately:
0.7 s in FAST mode
0.7 to 5 s in dynamic mode
Logging interval:
10 s to 24 h (in automatic logging mode)
Total memory capacity:
1000 sets of all input quantities manual logging mode
8124 values automatic noncyclic logging mode
7644 values automatic cyclic logging mode
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The above specified numbers are maximum possible. Capacity is slightly lower if logging was interrupted by
communication with computer, by stopping logging or switching OFF the instrument.
Real time clock:
Adjustable from computer, integrated calendar including leap years
Real time clock accuracy: < 200 ppm (i.e. 0.02 %, 17.28 s in 24 h)
Power:
Battery 9V or ac/dc adapter 12 V with NiMH accumulator 9V
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If instrument is supplied from external ac/dc adapter, internal 9V battery should be replaced with rechargeable
NiMH accumulator. In usual operation from adapter accumulator is charged only with small current. If
accumulator is totally discharged, its full charging in instrument takes approximately 100 hours. Instrument
with accumulator is not recommended for permanent operation without ac/dc adapter plugged. Accumulator
works only as a standby source in case of power mains failure.
Average current consumption:
0.15 to 0.7 mA (depending on operation mode)
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Battery life depends on selected display refresh mode (see below). In FAST mode display is refreshed in
shortest possible interval with highest current consumption. In dynamic mode display is refreshed in interval
up to 5 s in case measured values remain stable. Refresh interval is shortened to approximately 0.7 s only if
measured values change. Current consumption in this mode in usual operation is lower, battery life is up to 4
times longer. The FAST mode is recommend to use only in cases, when slower display response is not
acceptable.
Battery voltage drop below 7 V is indicated with blinking of "BAT" in default display mode (displaying of actual
values) and FAST mode is automatically cancelled to save the battery. At the same time audio indication of
alarms is automatically switched OFF.
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Electromagnetic compatibility:
Device conforms in accordance with EN 61326-1 these norms:
Radiation: EN 55022 class B
Immunity: EN 61000-4-2 (levels 4/8 kV, class A)
EN 61000-4-3 (intensity of electromagnetic field 3 V/m, class B)
EN 61000-4-4 (levels 1/0.5 kV, class A)
EN 61000-4-6 (intensity of electromagnetic field 3 V/m, class B)
EN 61000-4-11 (class A)
EN 61000-4-5 (class A)
Communication with computer:
USB port (USB mini connector)
Display:
Backlit two-line LCD
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Backlighting turns off automatically 10 seconds after the last keystroke
Protection:
IP20
Dimensions:
141 x 71 x 27 mm
Weight:
Approximately 150 g including battery without probe
Operation conditions
Ambient temperature operating range:
-10 to +60 °C, device
-30 to +105 °C, probe
Ambient rel. humidity operating range:
5 to 95 %RH (no condensation), device
0 to 100 %RH, probe
Temperature and rel. humidity restriction:
The measuring range of the external
probe is limited in accordance with the
graph and must not be exceeded!
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