Comet COMMETER C3631 User manual

COMMETER C3631
Digital thermometer-hygrometer with external temperature probe
Instruction manual

Manual for use of thermometer-hygrometer COMMETER C3631 with external
temperature probe
Instrument is designed for measurement of temperature and relative humidity (attached sensors)
and temperature from an external probe. It enables to display the dew point temperature and the
difference between external temperature and dew point temperature. Measured values are
displayed on a dual line LCD display. Temperature is measured by RTD sensor Ni1000/6180ppm.
Instrument compares measured values of temperature, humidity, dew point and temperature
difference 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:
Ambient temperature:Range of measurement: -10 to +60 °C
Resolution: 0.1 °C
Accuracy: ±0.4 °C
External probe temperature: Range of measurement: -50 to +250 °C
Resolution: 0.1 °C
Accuracy including probe: ±0.4 °C from -50 to +100°C
±0.5% from reading from 100 to 200°C
Humidity: Range measurement: 5 to 95 %RH
Resolution: 0.1 %RH
Accuracy: ±2.5 % RH at the range of 5 to 95 %RH
Dew point temperature (calculated from temperature and humidity):
Range: -50 to +60 °C
Resolution: 0.1 °C
Accuracy: ±0.5 °C at the range of 30 to 95 % RH
Measuring interval and display reading refresh: approximately 0.7 s in FAST mode
0.7 to 5 s in dynamic mode
Power: battery 9V or ac/dc adapter 12V with NiCd accumulator 9V
Average current consumption: 0.2 to 0.8 mA (depending on operation mode)
Typical life of Zinc-Chloride battery: 4 months
Typical life of Alkali-Mangan battery: 6 months
Operation conditions:
Ambient temperature range: -10 to +60 °C
Ambient relative humidity range: 5 to 95 %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.
The sensors (under the cover) should not be exposed to direct contact with water or other
liquids.
Storing conditions: temperature -10 to +60 °C relative humidity 5 to 95 %RH
Dimensions: 141 x 71 x 27 mm
Weight including battery: approximately 150 g
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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 canceled to save the battery. At the
same time audio indication of alarms is automatically switched OFF.
If instrument is powered from external ac/dc adapter, internal 9V battery is replaced with
rechargeable NiCd 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.
Switching ON and OFF the instrument
If you wish to use the external temperature probe, connect it before
instrument switching ON. Switch ON the instrument by pressing ON/OFF
key. After switching ON the instrument all symbols on the LCD are
displayed. If the ON/OFF key is being held pressed, all LCD symbols are
displayed till the key is released.
In usual operation instrument then starts the measurement mode and actual
measured values are displayed. It is possible to switch OFF the instrument
anytime and all setting will be saved. Setting will not be saved if battery is
disconnected for long than 1 minute.
Displaying of actual measured values
In this mode is instrument anytime after switching ON. It is possible to
enter this mode from other modes by pressing or by repeating pressing of
MENU key.
Ambient temperature in °C is displayed on the upper LCD line (symbol
INT) and relative humidity (%RH) is displayed on the lower LCD line.
Press DISPLAY key to display other readings - external probe temperature
in °C (symbol EXT) and dew point temperature on lower line (°C DP). If
external probe is not connected properly or temperature is out of measuring
range, symbol „--„ is displayed.
Press DISPLAY key to display other readings - external probe temperature
in °C (symbol EXT) and difference between external temperature and dew
point temperature (symbol DIF). The difference is defined as t dif = t ext -
t dp.
Function HOLD (storing of actual measured values) and minimum a maximum memory
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Press HOLD key in the default mode (displaying of actual measured value) to store actual
measured values to internal memory (indicated by short beep). Anytime it is possible to display
stored values from MENU (see below). Each pressing of the HOLD key in the default mode
causes values stored in HOLD memory are replaced with actual ones.
Switched ON instrument permanently updates minimum and maximum
memory of each measured values. Press MIN key (resp. MAX key) in the
default mode to display minimum (resp. maximum) reading. These
minimum and maximum readings are indicated by MIN (MAX) symbols
on the LCD. Press DISPLAY key to display minimum (resp. maximum)
value of other values.
Pressing MIN (MAX) or MENU key again to return to default mode. Minimum and maximum
memory is cleared from menu after confirmation selection CLR (see below). Values in HOLD,
MIN and MAX memories remain stored even after instrument is switched OFF.
Functions and settings available from menu
Press MENU key to enter mode of viewing menu items one by one. Press arrow keys up and
down to list all menu items. Press MENU key again to return to default mode (displaying of actual
measured values).
Pressing the ENTER key enables to enter the mode of setting alarm limits
for all quantities (see below).
This item indicates if audio signaling of alarm indication is switched on
(On) or switched off (OFF). Press ENTER key to change actual setting.
Notice: if the battery voltage is low, audio indication is out of operation to
reduce current consumption independently on this selection.
Clearing of minimum and maximum memory of all values. Memory is
cleared after pressing ENTER key. Clearing is confirmed by reading YES
on the LCD lower display.
Press ENTER key to display values stored in the HOLD memory. Press
DISPLAY key to display other stored values (dew point temperature).
Press MENU key to leave this mode.
Battery voltage of partially loaded battery is displayed. This value
illustrates battery condition.
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Display refresh mode is indicated. In the FAST mode refreshment is fastest
with regular interval approximately 0.7 s. In the dynamic refresh mode
(DYN.) each 15 s refresh interval of display is doubled to maximum 5 s
if measured values are stable. If measured values change, refresh interval
decreases to approximately 0.7 s. This dynamic mode prolongs battery life
significantly. Select the desired mode by ENTER key.
Notice: if battery voltage is low, the FAST mode is out of operation to
reduce current consumption independently on this selection.
Each pressing of ENTER key causes displaying of service information on
software version (upper LCD line) together with instrument configuration
on the LCD lower line.
Alarm indication and setting
It is possible to set lower and upper limit for each measured quantity.
Breaking of the limit is indicated by blinking of the appropriate value on
the display. If a new alarm was indicated (i.e. it was not active in the
previous measurement), display starts to display the value out of limits. If
at least one alarm is active, audio indication can be activated, if menu
AUDI "On" is selected (see setting described above). Alarm activation of
each value can be disabled by setting lower alarm limit of the desired
value up to its maximum. This is indicated by OFF reading at the position
of numeric value. Value of upper limit of the same alarm is indifferent.
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To set alarms press MENU key, select ALAR from menu items and
confirm by pressing ENTER key.
Reading ALLO indicates adjusted lower alarm limit (here air temperature).
Set the desired value by means of the arrow keys. Press and hold the arrow
key UP to make value increase fast. Press and hold the arrow key DOWN
to make value decrease fast. Release the arrow key and press ENTER to
confirm new limit.
Reading ALHI indicates adjusted upper limit of the same alarm (here air
temperature). Set the desired value in the same way as in above lower
limit. If needed it is possible to get back to lower limit setting of the same
alarm by pressing DISPLAY key. Press ENTER key to confirm new upper
limit.
Then you are offered to set alarm of other input value (here relative
humidity). The procedure is the same as the above temperature limit
setting. Alarm activation of each value can be disabled by setting lower
alarm limit of the desired value up to its maximum. This is indicated by
OFF reading at the position of numeric value. Value of upper limit of the
same alarm is indifferent.

Instruments further offers alarm setting of other measured quantities.
It is possible to leave the alarm setting mode by pressing MENU key. New
adjusted limits up to pressing MENU key are stored in memory.
After pressing ENTER key it is possible to set alarm limits for dew point
temperature.
Battery replacement
Low battery voltage is indicated on the display with blinking reading "BAT". It is necessary to
replace it with new one as soon as possible. Battery is located under small cover on the instrument
lower side. It is absolutely necessary to replace battery with instrument switched OFF, otherwise
setting of d.REF. and AUDI (from menu selections) and data in memory HOLD, MIN and MAX
will be lost. For the same reason do not disconnect the battery for longer than 1 minute even if
instrument is switched OFF. If it happens (or if battery is totally discharged), it is necessary to set
again in appropriate menu selection LCD refreshment mode (d.REF.), alarm audio indication
(AUDI) and clear the minimum and maximum memory (CLR).
Commeter instruments passed the following electromagnetic compatibility (EMC) tests:
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)
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