Comet Commeter C0121 Instruction Manual

www.cometsystem.com

Instruction manual

Commeter C0121

Dual channel digital thermometer
for RTD Ni1000/6180ppm probes

2 IE-COM-C0121-08

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

IE-COM-C0121-08 3

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.

4 IE-COM-C0121-08

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.