Crowcon Gas-Pro - Pumped Mode

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2.4.2 Pumped mode
Pumped operation requires the use of the pumped ow plate which automatically activates the pump (see
Bump/Pump functionality on page 33). Gas-Pro can either be worn or used with hoses and probes to
sample from spaces prior to entry. The pump capacity in the Gas-Pro is 0.5l/m and will draw a sample of
gas from 30m within 80 seconds. Please note the expected losses for some gases below. Please allow at
least 3 seconds per meter of hose used.
Tube Type Standard (AC0201/03/05/10/20/30)
Tube length 5 metres 10 metres 30 metres
Measurement Gas Name Loss Time Loss Time Loss Time
CO (250ppm) Carbon Monoxide 0ppm 9 s 0ppm 20 s 1ppm 79 s
H
2
S (25ppm) Hydrogen Sulphide 0ppm 10 s 1ppm 20 s 6ppm 78 s
CH
4
(2.5% VOL) Methane 0% VOL 10 s 0% VOL 20 s 0% VOL 78 s
CO
2
(5% VOL) Carbon Dioxide 0% VOL 9 s 0% VOL 20 s 0% VOL 79 s
O
2
(18% VOL) Oxygen 0% VOL 9 s 0% VOL 20 s 0% VOL 79 s
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If Gas-Pro is operated in pumped mode in combination with an exhaust pipe, a set of
bellows should be used inline (e.g. ow plate , 2cm maximum tube, bellows, 3000cm
maximum tube).
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Gas-Pro also has a specic pre-entry mode (see Section 2.6.5 on page 29).
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