●Features and specifications: A pocket-sized carbon monoxide meter that protects the operator. Can be used continuously for approximately 5,000 hours with one AA alkaline battery* (when no alarm is active, gas concentration display is 20ppm or less, at 20°C).
●Functions

Peak value Memory function	Displays the peak value from power ON until operation, and the elapsed time since recording the peak value. You can check the situation on site after work.
Peak Hold function	From the time of operation onward, the peak value is always displayed on the screen. You can check the peak value without operating during work.
Cumulative concentration Display function	Displays the cumulative concentration calculated by multiplying exposure time (hours) by CO concentration (ppm). When the cumulative concentration reaches 150 ppm·h, an alarm sounds to alert to the danger of long-term exposure to low-concentration gases.

●Applications: For workers to wear at steelworks, civil engineering sites, tunnel construction sites, painting sites, etc., to confirm work environment safety and ensure worker safety.
●Specifications

Model number	XC-2200
Target gas for detection	Carbon monoxide
Gas sampling method	Diffusion type
Detection principle	Constant potential electrolysis type
Detection range (Service range)	0–300 ppm (300–2000 ppm)
Alarm setting values	Level 1: 50 ppm Level 2: 150 ppm Cumulative concentration*3: 150 ppm·h
Response time*1	Within 30 seconds
Display method	Liquid crystal digital (manual backlight)
Alarm method	Buzzer, red lamp flashing, LCD display, vibration
Additional functions	Battery level indicator, peak hold function, peak value memory function, cumulative concentration display function, alarm functions other than gas alarm (cumulative concentration*3, sensor abnormality, low battery, zero adjustment failure), gas calibration function
Operating temperature and humidity range	-10°C to 40°C, 30–90% RH or less (no condensation)
Power supply	One AA alkaline dry battery
Continuous use time*2	Approximately 5000 hours (when no alarm, gas concentration display is 20 ppm or less, at 20°C)
Dimensions	W65×H64×D22mm (excluding protrusions)
Weight	Approximately 75g
Standard accessories	One AA alkaline dry battery, one safety pin adapter (with mounting screw)
Optional accessories	Leather case, heat-resistant leather case, clip strap, gas inspection jig, gas calibration set, helmet clip set*4, filter element

*1 90% response, ambient temperature at 20±2°C.
*2 Conditions, usage, storage period, and battery manufacturer may affect performance.
*3 Cumulative concentration is expressed as the product of gas exposure time (hours) and gas concentration (ppm). In this device, the average concentration over 1 minute is accumulated and divided by 60 minutes. The time calculation has an error of about ±5%. The unit is conveniently expressed as ppm (for example, if CO 30 ppm is continuously exposed for 5 hours, it is calculated as 30 ppm×300/60=150 ppm·h).
*4 Depending on the type of helmet, it may not be attachable.