GasWatch 3 for CO and O
2
Chapter 1: Introduction • 7
Specifications
Table 1: Standard Sensor Specifications/Alarm Points
Table 2: GasWatch 3 Specifications
Carbon Monoxide (CO)
Oxygen (O
2
)
Detection Range
0 - 300 ppm
0 - 25.0% volume
Service Range
310 - 2,000 ppm
25.1 - 40.0% volume
Reading Increment
0 - 300 ppm: 1 ppm
310 - 2,000 ppm: 10 ppm
0.1% volume
Warning Factory Setting
25 ppm
19.5% volume, decreasing
Alarm Factory Setting
50 ppm
18.0% volume, decreasing
Alarm H Factory Setting
1200 ppm
23.5% volume, increasing
STEL Alarm
200 ppm
n/a
TWA Alarm
25 ppm
n/a
Sampling
Method
Diffusion
Response Time
T90 Within 10 Seconds
Display
Graphics LCD Display
Operating
Temperature
& Humidity
Continuous environment
: -20°C to 50
°
C/10 to 90% RH
Temporary environment (up to 15 minutes)
: -20°C to 60
°
C/0 to 95% RH
Indication
Accuracy for
Detection
Range
CO
: ± 5% of reading or ± 5 ppm CO (whichever is greater)
O
2
: ± 0.5% volume O
2
Indication
Accuracy for
Service Range
CO
: ± 20% of reading
O
2
: ± 3.0% volume O
2
Safety/
Regulatory
• ATEX: II 1G Ex ia IIC T4 Ga
Certificate Number Presafe DEKRA 18ATEX0130
• IECEx: Ex ia IIC T4 Ga
Certificate Number IECEx DEK 18.0082
• CSA classified, “C/US”, as Intrinsically Safe. Exia. Class I, Groups A, B, C, & D.
Temperature Code T3A.
Certificate Number CSA 19 CA70213062
C US
186718
Power Supply
CR2450 button cell battery
