Comet Commeter C0121 Instruction Manual

www.cometsystem.com

Instruction manual

Commeter C0121

Dual channel digital thermometer
for RTD Ni1000/6180ppm probes

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Table of contents

GENERAL DESCRIPTION ............................................................................................................. 3

TECHNICAL PARAMETERS .......................................................................................................... 4

Parameters of measurement .................................................................................................. 4

General .................................................................................................................................. 4

Operation conditions .............................................................................................................. 5

Dimensions ............................................................................................................................ 6

OPERATION OF THE DEVICE ....................................................................................................... 7

Switching ON and OFF the device ......................................................................................... 7

Displaying of actual measured values .................................................................................... 7

Function HOLD (storing of actual measured values) and minimum a maximum memory ....... 7

Functions and settings available from menu .......................................................................... 8

Alarm indication and setting ................................................................................................... 9

BATTERY REPLACEMENT .......................................................................................................... 11

TECHNICAL SUPPORT AND SERVICE ...................................................................................... 12

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General description

Instrument is designed for measurement of temperature from two RTD Ni1000/6180ppm probes.
Measured values are displayed on a dual line LCD display. Temperature is measured by RTD
sensor Ni1000/6180ppm. Also temperature difference among channels is possible to measure
and display. Instrument compares measured with two adjustable levels. 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.

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Technical parameters

Parameters of measurement

Temperature:

Measuring range: -50 to +250 °C (with the limitation according to the used probe)
Resolution: 0.1 °C
Accuracy: ± 0.4 °C from -50 to +100 °C
± 0.5 % from reading from +100 to +250 °C

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Applies for the device including the probe supplied by the manufacturer

± 0.2 °C from - 50 to +100 °C
± 0.2 % from reading from +100 to +250 °C

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Applies for the input of the device without probe

General

Compatible temperature probe:

RTD Ni1000/6180ppm sensor with CINCH connector

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:

0.08 to 0.3 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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Measuring interval and display reading refresh approximately:

0.7 s in FAST mode

0.7 to 5 s in dynamic mode

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)

Display:

Backlit two-line LCD

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Backlighting turns off automatically 10 seconds after the last keystroke

Protection:

IP20

Dimensions:

146 x 71 x 27 mm

Weight:

Approximately 150 g including battery without probe

Operation conditions

Ambient temperature operating range:

-30 to +65 °C

Ambient rel. humidity operating range:

5 to 95 %RH (no condensation)

Storage temperature range:

-40 to +85 °C

Storage relative humidity range:

5 to 95 %RH (no condensation)

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Dimensions

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Operation of the device

Switching ON and OFF the device

Connect the external probes to the connectors before switching ON the
instrument. 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. If instrument is ON, do not disconnect or connect the probe to prevent storing of
incorrect value to minimum and maximum memory.

It is possible to switch OFF the instrument anytime, all instrument setting is kept saved.

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 the external probe is not connected properly or probe is out
of measuring range, reading -- is displayed on the upper LCD line.

Channel 1 temperature in °C is displayed on the upper LCD line.
Channel 2 temperature in °C is displayed on the lower LCD line.

Press DISPLAY key to display the temperature difference DIF between
channels (T dif = T1 - T2).

Function HOLD (storing of actual measured values) and
minimum a maximum memory

Press HOLD key in the default mode (displaying of actual measured temperature) to store actual
measured value to internal memory (indicated by short beep). Anytime it is possible to display
stored value from MENU (see below). Each pressing of the HOLD key in the default mode
causes value stored in HOLD memory is replaced with actual temperature.

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Switched ON instrument permanently updates minimum and maximum
memory of temperature. 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.
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).

It is possible to enter alarm setting mode by pressing ENTER key (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 temperature. 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. values.
Press MENU key to leave this mode.

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Battery voltage of partially loaded battery is displayed. This value
illustrates battery condition.

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.

Pressing of ENTER key causes displaying 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
temperature and the temperature difference. Breaking of the limit is
indicated by blinking of the value on the display. Alarm activation can
be disabled by setting lower alarm limit 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.

To set alarms press MENU key, select ALAR from menu items and
confirm by pressing ENTER key.

Reading ALLO indicates adjusted lower alarm limit. 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.

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Reading ALHI indicates adjusted upper limit. 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
temperature of channel 2). 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.

After pressing ENTER key it is possible to set alarm limits for
temperature difference between channels.

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.

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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).

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Technical support and service

Technical support and service is provided by distributor. Contact is included in warranty
certificate.