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Technical data
Ref. B210833EN-A ©Vaisala 2009
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifi cations — technical included — are subject
to change without notice.
DSS70A Sampling System and
DSC74B/C Sampling Cells
The DSS70A sampling system includes a fi lter to clean the dirty
sample gas and a needle valve to control the sample fl ow rate
with the fl ow meter. A sample pump is used to generate a sample
fl ow from processes at ambient pressure.
The DSC74B sampling cell enables the measurement of the
sampled gas either in gas pressure up to 10 bar or in atmospheric
pressure depending on the gas inlet and outlet. The DSC74C
is like the DSC74B but with an additional coil to avoid back
diffusion, the effect of surrounding moisture, in dewpoint
measurements in atmospheric pressure.
Sampling cells technical data
DSC74 sampling cell for pressurized gases
pressure limit 1 MPa (10 barg, 145 psig)
DSC74B two pressure sampling cell
pressure limit 1 MPa (10 barg, 145 psig)
DSC74C DSC74B with DMCOIL cooling/
venting coil
DSS70A sampling system
Operating conditions
Operating gases air, N2 and other non-toxic,
inert gases
Dewpoint range -70 °C ... Tamb (-76 °F ... Tamb)
Inlet/outlet connection 1/4" Swagelok
Operating temperature
ambient temperature 0 ... +40 °C (32 ... +104 °F)
process gas temperature
with PTFE tube at +20 °C (+68 °F) max. +200 °C (+392 °F)
with stainless steel tube specifi cation according to
stainless steel tube specifi cation
(included in the DSS70A)
maximum gas temperature at inlet +40 °C (+104 °F)
Operating pressure
with pump 0.6 ... 1.2 bara (8.7 ... 17.4 psia)
pump disconnected 0 ... 20 bara (0 ... 290 psia)
General
Battery operation time for pump 8 h continuous use
battery can be recharged using DM70 charger
Filter 7 mm inline fi lter cartridge 1/4"
Swagelok SS-4F-7
(spare part order no. 210801)
Materials
wetted parts Stainless steel
carrying case ABS plastic
Case size (W x D x H) 430 x 330 x 100 mm
Weight 5.5 kg (12 lbs)
Electromagnetic compatibility
EN61326-1, Generic Environment.
DMCOIL cooling/venting coil
DMT242SC sampling cell
pressure limit 10 MPa (100 barg, 1450 psig)
DMT242SC2 sampling cell with Swagelok
connectors
pressure limit 4 MPa (40 barg, 580 psig)
Material for all sampling cells stainless steel AISI316
Sample Gas
Inlet
Sample Gas
Outlet
Sample Pump
Flow meterNeedle Valve
Sampling Cell
for Td ProbeFilter
DSS70A
Sample gas
inlet
Sample gas
outlet
Valve
Removable
flow limiter
Sample gas
inlet
Sample gas
outlet
Valve
Removable
flow limiter
Measurement in
atmospheric
pressure
Diffusion coil
DSC74B
DSC74C
Sampling Cell
for Td Probe
Sampling Cell
for Td Probe
DSC74B
Measurement
in gas
pressure
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