Heated sample lines - self regulated heating: Typ 30 pages

Embracing Challenge
Electrically heated sample lines
type 3/4/5/-5/30/50/80/100/120 (Ex)
Self regulated, 3 type tubes and 6 temperature versions
from +5 °C to +120 °C
4-5/30/50/80/100/120
Special Features
Self regulated, without thermostat
Completely assembled
Y
ard ware treated externally
Outer shell corrugated tube of Polya-
mide
PTFE tube non interchangeable type 3/
PTFE tube interchangeable type 4/
Stainless steel tube non interchangeable
type 5/
Tube ø 4/6-10/12 mm DN ..
6 temperature ranges from +5 °C to
+120 °C
Holding temperature at -20 °C
Ex-version for zone 1, 2, 21 and 22
according to ATEX
Application
The electrically heated self regulated M&Csample lines 3/4/5/-5/30/50/80/100/120 (Ex)
are used in gas analysis technique for transportation of the sample gas from the sample
point to the gas conditioning system. They
prevent measurement faults in the lower
temperature ranges from +5 °C to +120 °C
and protect the system against freeze. A temperature monitoring of the total heated line is
not possible due to the function as parrallel
heater band.
Description
The self regulated M&C-sample lines 3/4/5/5/30/50/80/100/120 are supplied according
to clients requirements completely assembled in the factory with connections and
endings in a fixed length or as yard ware for
treatment by the customer.
3 tube types (3/4/5/) and 6 versions of different temperature ranges (5/30/50/80/100/120)
are available with respective DN 4 mm, 6 mm
or larger (-4/6/8/10).
The robust manufacture of the sample line
consists of an inner tube/pipe and a self
regulated parallel heater band, both covered
with thermoconducting aluminium as well
as a further thermal insulation and the black
coloured corrugated Polyamide-tube outside.
The operating temperature (guaranteed
minimum temperature) of the self regulated
heated sample lines of M&C is related to an
ambient temperature of -20 °C. It is not necessary to use an external thermostat.
Description of the self regulated
heater bands
The self regulated parallel heater bands consist of two parallel supply conductors of copper which are embedded in a cross-linked
and with particles of carbon doped plastic
heater element with a positive temperature
coefficient. The heater element changes its
capacity in relation to the ambient temperature. When the temperature increases, the
plastic is expanding due to the molecular
expansion, the compounds of the carbon
particles break up, the resistance increases
and, therefore, the capacity is decreasing.
When cooling down, this process is reversed
and the capacity increases. Thus, the heater
band is adapting its temperature everywhere
in the sample line according to individual
temperature requirement.
The endings of the completely assembled
execution are sealed connections out of
silicone.
The explosion-proof versions 3/4/5/5/30/50/80/100/120 Ex for use in hazardous
area zone 1, 2, 21 and 22 are equipped with
EEx proved self delimited heater bands. The
sample lines assembled in our works have got
a connection cable respectively a heater band
for the Ex versions of 1 meter leaving the line
axially. On both sides, the tube or pipe is jutting out by 500 mm.
Supply conductor
copper-nickel faced
Insulating cover
Self regulating
heating element
Protective cover
metal cover out of
Cu-plaiting with nickel
For assembling at the customers’ side,
the respective accessories are available.
Technical specifications and illustrations are without
obligation, subject to modifications. 09.96/05.08
M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
info@mc-techgroup.com • www.mc-techgroup.com • Fon +49 2102 935-0 • Fax +49 2102 935-111
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