Tubes Handbook 18th Edition (EN) - May 2018

|57
A
The Dräger Flow Check incorporates ergonomic form,
low weight, and optimal operation into the instrument
design. The instrument will generate clouds in any
orientation.
ST-61-98
Small, single clouds can be generated with a short press of a button. If a continous
production of clouds is desired, the button can be held or locked in the “on” position. The
fluid ampoule is located in a compartment in the handle of the instrument and can be
inserted effortlessly into position. The amount of fluid contained in the ampoule is enough
to generate approximately five minutes.
Power is supplied by a battery located in the handle of the
instrument and can be charged while inside the instrument or
separately. A quickcharge option is also possible with the
charger. An adapter cable can be used to charge the device from
a car mounted cigarette lighter.
ST-64-98
Dräger Flow Check
2.13 Dräger-Measurement-Systems for Long-term
Measurements
The Dräger diffusion tubes are direct reading systems used for the determination of time
weighted average concentrations over the duration of one to eight hours. Since these are
passive measurement systems, relying on the diffusion of contaminant molecules in air, they
do not require a pump. The diffusion tubes are used with a plastic holder which is attached
to the clothing (shirt collar, pocket, etc.).
The scale printed on the diffusion tube represents the
product of the concentration and exposure time given e.
g. as ppm x h, ppm x min, Vol.-% x h or mg/L x h. To
determine the average concentration of the contaminant,
the scale reading is divided by the exposure time (i. e.
sampling time) according to the following:
c =
indication in ppm · h
time in h
[ppm]
Dräger-Diffusion-Tubes with direct
indication
ST-1350-2004