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V1.0
28/06/22
Newark.com/multicomp-pro
Farnell.com/multicomp-pro
sg.element14.com/b/multicomp-pro
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[MUTE] button
When the user has learned the alarming condition, press the button to stop current alarm and the buzzer will stop
working within 3 minutes. Long press the button will reactivate the buzzer.
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[HOLD] button
Press [HOLD] button to lock the current displayed readings; long press [HOLD] button to enter the settings for alarm
set points A1 and A2.
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[SET] button
(1) Press SET under normal detection status to start sensor self-test.
(2) When setting the alarm points or enter the calibration mode for zero setting and calibration, press SET to choose
parameters and long press [SET] button to save the current set values.
III. Operation Instruction
1. Power On/Off
A yellow button lies on the upper-left part of panel keypad. When the instrument is under shutdown status, it is able to turn
on the instrument with a long press on the button and, when under startup status, the instrument can be shut down with a
long press on the button (Note: shutdown is not allowed during self-checking of gas sensor). The instrument would
automatically shut down in case of no operation or alarm action within about 20min.
Note:
It is required to start up the instrument and perform startup countdown in clean air until there is the gas concentration
unit (ppm icon) and during which, keep the instrument body stable and the sensor upward. Detection should be carried out
after countdown.
2. Detection Method
Hold the instrument, keep sensor upward and near the position to be monitored, maintain the instrument body stable for
monitoring at least 1min, then the instrument is capable of detecting if there exists high concentration of toxic gas (carbon
monoxide) in the air around the measured position, The response time is T90<60S. The stable reading obtained 3-4min later
is considered as the measured reading.
If any obvious change in the ambient temperature is observed, it is recommended to restart up the instrument in clean air
when heat balance is reached between the instrument and the environment (>1 hour).
It is required to keep the instrument body stable and the sensor upward during startup and startup countdown so as to reduce
error or zero jump caused by temperature variation or vibration.
3. Alarm
When the carbon monoxide concentration exceeds low alarm point A1 or TWA, the buzzer will sound and the light will flash at
the frequency of 1 Hz; when the carbon monoxide concentration exceeds high alarm point A2 or STEL, the buzzer will sound
and the light will flash at the frequency of 2Hz.
When the user has confirmed the current alarming condition, the user can press [MUTE] button to stop the audible alarm. The
buzzer will stop working temporarily and the icon in the upper left corner of LCD will disappear. After 3 minutes, the buzzer
will start working and the icon will appear again; long press [MUTE] button when the buzzer stops working, the buzzer can be
reactivated and the icon will appear immediately.
4. Sensor Self-Test
(1) The user should allow the device self-test at a regular basis (recommended once/24hr to once/month, frequent self-test is
not recommended), After start-up, press [SET] button to allow the sensor self-test for 3 minutes.
If the sensor is broken or wire breakage, short circuit,
FAULT
icon will flash in the upper right corner of LCD.
Please note that the sensor self-test cannot detect CO sensitivity loss caused by lack of gas diffusion when dust or water
droplets cover the pin holes for gas diffusion. In addition, slight loss of CO sensitivity cannot be detected by self-diagnosis.
