COMMETER C0321
Dual channel thermometer for thermocouples J,K,S
Instruction manual
Manual for use of dual channel thermometer for thermocouples J, K, S
COMMETER C0321
Instrument is designed for measurement of temperature from two thermocouples of types J, K, S
with the possibility to display the temperature difference between channels. Measured values are
displayed on a dual line LCD display. Instrument compares measured values of temperature with
two adjustable levels for each measured channel. 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 (both channels):
Range of measurement (with the limitation of connected probe parameters:
thermocouple J (Fe-Co) -200 to +750°C
thermocouple K (NiCr-Ni) -200 to +1300°C
thermocouple S (Pt10%Rh-Pt) -50 to +1700°C
Resolution:
thermocouples J and K 0.1°C from –99.9 to +999.9°C, otherwise 1°C
thermocouple S 0.4°C from –50.0 to +999.9°C, otherwise 1°C
Accuracy of inputs without probes:
thermocouples J and K ±(0.1% +0.4°C) from reading
thermocouple S ±(0.1% +0.85°C) from reading
Compatible temperature probes: J,K,S thermocouple with subminiature male thermocouple
connector
Compensation of thermocouple cold junction temperature: automatic from –10 to +60°C
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: 0.3 to 1.3 mA (depending on operation mode)
Protection: IP20
Operation conditions:
Ambient temperature range: -10 to +60 °C
Ambient relative humidity range: 5 to 95 % RH, non condensing
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
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
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.
If instrument is supplied from external ac/dc adapter, internal 9V battery should be replaced with
rechargeable NiCd accumulator. In usual operation from adapter accumulator is charged only with
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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
Connect one or two temperature probes to the connectors before switching
ON the instrument. Channel 1 connector is on the left and channel 2 is on
the right. 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.
Actual selected thermocouple type is then displayed shortly. Symbols J or
nicr (thermocouple K) or S indicate actual thermocouple type. If selected
thermocouple does not mach the probe type connected to the instruments,
temperature readings will not be correct and new selection of thermocouple
type is necessary (see below).
In usual operation instrument then starts the measurement mode and actual
measured values are displayed. If instrument is ON, do not disconnect or
connect the probes to prevent storing of incorrect value to minimum and
maximum memory.
Press MENU key to switch instrument to actual measurement mode.
It is possible to switch OFF the instrument anytime, all instrument setting is
kept saved. If 9V battery is disconnected for more than 1 minute all settings
will be lost.
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. If one of the probes is not
connected properly or the temperature is out of measuring range, reading -- is displayed on the
appropriate LCD line.
Na horním řádku displeje se zobrazuje teplota 1. kanálu T1 (°C 1), na
dolním řádku teplota 2. kanálu T2 (°C 2)
Press DISPLAY key to display other readings. Instrument then displays temperature of channel T1 on the upper line and difference between
channels on the lower line (symbol DIF). Temperature difference (t dif = t1
- t2) is displayed only, if both probes are connected.
Function HOLD (storing of actual measured values) and minimum a maximum memory
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