review some tips for the gas sampling system design and review the features of the recent Buhler technology products.

1. Engineering tips in sampling systems
with
&
Pouriya Niknam , Dec 2016 Piramoonco.com

2. Table of content
• NOx converter
• gas pump
• Gas coolers
• Filters

3. NOx converter

4. type Temp eff Max NO2
Content
Carbon
Based
200C 95% 150ppm
Same Price
Metal
Based
400C 97% 300ppm
•Maintenance calculator NOxCal for service life monitoring

5.  NOX Converter

6.  NOx converter types

8. No ATEX NOx converter, Purge the Cabinet to keep it ex-free
400C-->450C: trick for temporarily reactivate the NOx, 3week…
NO2--- NO+O2
Less Side effects:
◦ No O2 added to sample
◦ No SO2 reduction
◦ No CO Production
◦ No Pressure Drop
(140mbar)

10.  Basics: Pump head

11. NL/H
Long distance from tapping point -- decrease flow rate

13. defective bellow
SUCTION FROM AMBIENT
For bellow Test

14. Pump
Compressor
Cooler
Analyzer
Dual Stage
Comp.
Cooler
pump Analyzer
Pump/Dual Stage
Comp. Cooler
Analyzer
Some discussion about Components Order…

22. Notformining
Zone1(outsidepump)
Equipmentprotection(Gas)atmosphere
Zone1(insidepump)
ConstructivelySafe
Justforsurrounding
TemperatureRange(alsocoverT1/T2)
Special

24. Pump Tips & Notes:
These items will reduce lifetime:
 Operation with non atmospheric pressure
 Operation under high temperature condition
item sample pressure
Buhler Nox Converter <1.5 bar absolute
GMS800 –200 hPa ... 1,000 hPa
Siemens ultramat23 (BA5000) 0.5 to 1.5 bar absolute
Siemens OXYMAT 64 (High P) 2 000 hPa (abs.)
(Low P) 30 hPa more than atmospheric
BA3 100 to 200 mbar (gauge)
BA 3500 Pressure 10 - 200 mbar
BA 6000-O2 0.5 to 1.5 bar absolute

25. Pump Tips & Notes:
 No ATEX version for 800L/hr pump
 New product with ATEX cert. as 700L/hr, but
◦ No option for head material
◦ T3 only
 Temperature will be limit by the bottleneck
 ATEX will be expired after 5 years (from production date and not
operation)
◦ They can be used in non hazardous area for another 10 years
period.
◦ Or sending to Buhler for complete service.
 Membrane like KNF are using Glue (Acid, Solvent,…)
 Buhler specific Sample pump without any glue
◦ (Honeywell Changed from KNF to Buhler )

26. Pump Tips & Notes:
The sample gas pump is suitable for gases only, not for liquids.
The sample gas pump should be operated without pressure.
A system pressure above 0.3bar is not allowed.
The gas outlet must not be closed.
The flow rate must be at least 50 l/h (150 l/h with system pressure
0.3 bar).
If the flow rate continuously is throttled below 150 l/h during
operation, the flow rate must be controlled with a bypass valve.
Extreme throttling reduces the life time of the bellow.
If the pump is equipped with a bypass valve, the flow rate can be
adjusted
rated current of the circuit breaker switch
 230 V = 0.48 A,
 115 V = 0.84 A,
 24 V DC = 0.8 A

29. Peltier gas coolers (PKE)
compact /one gas path Per Heat exchanger/cheaper than compressor coolers
standard application:
volume flow of 150 l/h at 1 bar@ 70°C , inlet dew point of 40°C.
Compressor coolers (EGK)
working principle as refrigerator/ more cooling power than peltier coolers.

30.  Cooler selection
• energy to cool the gas about doubles with a rise of dew point of 10°C
• double pressure = double energy to cool
• the factory setting of the gas outlet temperature and dew point
of approximately 5°C
Exchanger material
•Steel >the best choice
•aggressive components > glass then
•Only in certain applications PVDF
We suggest to limit the load on the heat exchanger to a range of 60..80%.
•For M&C glass type is cheaper than SS.
•For Buhler SS is cheaper with better performance for non-corrosive cased

31. Cooler tips
Buhler double stream exchangers
EGK 1/2, PKE 42 or EGK 2 Ex
saves money and time for mounting
Cross-sensitivity is very low:
Vari0ating one path in the whole energy range of the exchanger will variate
the other path in a maximum of 0,5K!
In case of same gas energies  variations of the one streams outlet
dewpoint by switching on and off the other stays below 0,2K

34.  Compact size: approx. 250 x 220 x 200 mm
 Peltier cooler with 1 heat exchanger
 Adjustable dew point 3/5/10/15 °C
 Adjustable Delta T Control
 Analogue signal output
 Power supply 24 V DC
 Power max. 70 W

35. Dual P. Pump