GasSecure GS01, User Manual

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GasSecure GS01
Hardware Manual
TECHNICAL DATA
35
8. TECHNICAL DATA
8.1 Performance Characteristics
Table 8-1: Performance characteristics for the GS01
Detector Version GS01-01A GS01-02A
Calibration Gas Methane Propane
Measuring Range 5 0 – 100% LEL 0-80% LEL
Internal Low Alarm Limit
6
10% LEL
Initialization time 60 s
Response
time Default 5 s > 10% LEL 5 s > 10% LEL
Maximum for low
concentrations
7
60 s < 10%LEL 60 s < 10%LEL
Accuracy 8 ± 3% LEL or
± 10% of
reading,
whichever is
greater ± 2% LEL or
± 10% of reading
whichever is
greater. ± 20% of
reading > 80% LEL.
Dead band ± 4% LEL ± 3% LEL
Battery life time
9
Up to 2 years
8.1.1 Response time for other hydrocarbon gases and mixtures
Table 8-1 states response times for different concentrations of methane and
propane in air. In order to achieve the default response time of 5 seconds, the
speed of sound in the gas or gas mixture must be sufficiently different from this
speed in air to be detected by the ultrasonic sensor (please refer to Section 1.1 for
a brief introduction to the GS01 dual sensor concept). For methane and propane
this occurs for concentrations above 10% LEL.
Note that, with hydrocarbon gas mixtures of light (e.g. methane) and heavy (e.g.
propane) gas, the ultrasonic sensor must respond to a mixture of gases, with a
speed of sound that could be close to that in air. Therefore, larger concentrations
are required for mixtures of methane and propane to consistently achieve the 5
second response time. For other hydrocarbons, there will be differing
concentration limits that will be required to achieve the 5 second response. Please
contact GasSecure for advice of the concentration limits for other gases or gas
mixtures. Note that the response time for low concentrations of hydrocarbon gas is
never more than 60 seconds.
5
LEL limits, please refer to Table 3-2
6
Refer to Section 3.3.1 for further explanation
7
Due to the limited sensitivity of the ultrasonic sensor
8
Refers to operating temperature range.
9 Assuming I/O device role and non-condensing environment.