12
●
WatchGas B.V.
●
Klaverbaan 121,
2908KD, Capelle a/d IJssel, The Netherlands
●
●
T: +31 (0) 85 0187709
●
●
▪
Immediately thereafter start the timer to the time designated for the type of detector tube.
Figure 10: Timer
▪
Remove the detector tube of CO, CO2 and H2O after 5 minutes from the tube holder and take
the readings from the printed scale on the tube, on the Air Quality Analysis Form.
▪
After concluding the sampling time remove the Oil detector tube from the sampling device and
bend at the indicated point (between two arrowheads) to break the internal reagent filled
ampoule (Caution: the ampoule contains concentrated sulfuric acid).
▪
Allow the ampoule fluid to flow onto the indicator layer, apply suction using a detector tube
pump until the indicator layer is covered approx. 10 mm with the ampoule fluid.
▪
Wait 1 minute before evaluating the indication. If no color change occurs, the oil content within
the pressurized gas sample is below the detection limit of the detector tube and below the
evaluated reference value of interest 0.1 mg/m
3
, 0.3 mg/m
3
, 0.5 mg/m
3
resp. 1.0 mg/m
3
.
Optional:
▪
When requiring to test NOx, please contact WatchGas for instructions.
▪
When requiring to test O2, please contact WatchGas for instructions.
▪
When requiring to test SO2, please contact WatchGas for instructions.
▪
When requiring to test PH3, please contact WatchGas for instructions.
▪
When requiring to test H2S, please contact WatchGas for instructions.
▪
When requiring to test NH3, please contact WatchGas for instructions.
5.3
Measuring on Compressors
.
▪
Switch on the compressor
▪
Wait until 200 or 300 bar is reached
▪
Switch off the compressor
▪
Slowly open valve on compressor
▪
Perform the test as described in para 5.2
The water content that is measured in air from a compressor only corresponds to the water content of
compressor gas cylinders simultaneously charged, or cylinders charged immediately after measuring, if
a pressure retaining valve is built into the compressor at the exit side of the drying cartridges. A
prerequisite, however, is that the cylinders to be charged are dry.
The pressure retaining valve assures that the pressure inside the compressor drops only insignificantly
from the maximum pressure of 300 or 200 bar, when cylinders are being charged. With compressor that
has no pressure retaining valve behind the filters, water from the drying cartridge can be released to the
sudden decompression when the charging connection is opened. The air has then higher water content
as was measured on the compressor charging panel.
