Heath-consultants Odorator Propane Uživatelský manuál stáhnout pdf (Strana 5)

INTRODUCTION

Propane gas to be tested enters the ODORATOR through the barbed

tting at the gas supply inlet port. Internally, the gas passes through

an internal ve micron lter to the input of a low pressure regulator.

It then passes from the output of the low pressure regulator to the

ow metering valve. This valve, located on the top panel of the

ODORATOR, is operated by the user. After passing through the

valve (when opened), the gas enters the mass ow sensor. This is

the heart of the ODORATOR. The mass ow sensor responds to gas

ow within the range of the ow metering valve.

The signal from the mass ow sensor is then processed, converted to

a digital signal and fed to a liquid crystal display (LCD). The gas from

the mass ow sensor then passes to the mixing chamber where it is

combined with air drawn in by a blower wheel. The user then sniffs

the gas / air mixture at the exhaust port. The ow metering valve

is incrementally opened and the exhaust port sniffed until odorant

is readily detectable at which time the user presses and holds the

READ switch down to display percent gas in air by volume.

The electronics and the speed of the blower wheel are calibrated

so that the concentration of the propane gas / air sample at the

exhaust port agrees with the LCD at the 25% Lower Explosive Level

(L.E.L.) which is .55% gas. All other readings may be corrected using

the correction chart. The correction chart is included to linearize

the instrument within its range. To use the chart, record both the

ODORATOR readily detectable level reading and the corrected actual

value. For ODORATOR readings not specied in the chart, linearly

interpolate between the next highest and lowest points on the chart.

Do not extrapolate beyond the readings in the chart. Depending on

how much the ow metering valve is opened, the concentration of gas

in air at the exhaust port will be anywhere from zero to approximately

1%. The LCD can only indicate up to 1.99%. Concentrations above

1.99% will be indicated by the LCD having its last two digits dashed

out as “1.--”.

When the ODORATOR is turned on, the user might momentarily

notice the letter “L” on the LCD when the READ switch is depressed

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Heath-consultants Odorator Propane Uživatelský manuál Strana 5