2 IE-COM-D3121-09
Manual for use of thermometer-hygrometer COMMETER D3121
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.
Technical parameters:
Parameters of measurement:
Temperature:
Range of measurement: -30 to +105 °C (temperature from +85 to +105°C with the
limitation accordingly to the graph below)
Resolution: 0.1 °C
Accuracy: ±0.4 °C
Humidity: Range measurement: 0 to 100 %RH
Resolution: 0.1 %RH
Accuracy: ±2.5 % RH at the range of 5 to 95 %RH at 23°C
Dew point temperature (calculated from temperature and humidity):
Range: -50 to +80 °C
Resolution: 0.1 °C
Accuracy: ±0.5 °C at the range of 30 to 95 % RH
Response time with stainless sensor cover (air flow approximately 1 m/s):
air temperature: t90 < 75 s (temperature step 20 °C)
relative humidity: t90 < 60 s (humidity step 30 %RH, constant temperature)
Measuring interval a display reading refresh: approximately 0.7 s in FAST mode
0.7 to 5 s in dynamic mode
Logging interval (only in automatic logging mode): 10 s to 24 h
Memory capacity: for manual logging 1000 sets of all input quantities
for non cyclic automatic logging total 8124 values
for cyclic automatic logging total 7644 values
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
Communication with computer: RS232 (serial port)
Real time clock: adjustable from computer, integrated calendar including leap years
Power: battery 9V or ac/dc adapter 12V with NiCd accumulator 9V
Average current consumption: 0.15 to 0.7 mA (depending on operation mode)
Operation conditions:
Ambient temperature range: -10 to +60 °C
Ambient relative humidity range: 5 to 95 %RH non condensing, probe 0 to 100% RH
Outer characteristics in accordance with EN 33-2000-3: normal environment with
characteristics AD1, AE1, AF1, AG1, AH1, AK1, AL1, AN1, AP1, AQ1, AR1, AS1,
BA1, BE1
Not allowed manipulation: it is not allowed to touch sensors under the cover to avoid
sensors damaging or to effect calibration.
Dimensions: 141 x 71 x 27 mm
Weight including battery: approximately 150 g
