pYroeleCtriC deteCtors For gas monitoring
PYRODETECTORS
FOR GAS
AND MEASURING
MONITORING
PYS 3228, PYS 3428 – Dual Channel Pyro
applications
• Gas sensing and monitoring
Features and Benefits
• TO-5 metal housing
• Dual channel output
• Each channel with individual filter window
• Selection of narrow band pass filters
• Thermal compensation option
• EMI protection option
product description
As successor of the LHi 814 series the PYS 3228 dual channel detectors have become standard for
gas sensing applications, with two individual elements of size 1.5 x 1.5 and additional temperature
compensation. They are available with a range of narrow band pass filters, as specified on page 7 in
combination with a reference filter.
The same features are included with the PYS 3428, which offers additional EMI protection by
internal capacitors.
All dimensions in mm
PYS 3228, PYS 3428 – Dual channel Pyro
Parameter
Responsivity, min.
Responsivity, typ.
Match, max.
Noise, max.
Noise, typ.
Spec. detectivity
Field of view, horizontal
Field of view, vertical
Source voltage
EMI performance
Height
Optical element location
Filter size
Symbol
R
min
R
M
max
N
max
N
typ
D*
FoV
FoV
PYS 3228
2.2
3.5
-
50
15
77
PYS 3428
3.5
5.0
-
50
20
77
0.2 … 1.5
***
4.2
/ 0.55
2.65 / 2.4
V
mm
mm
mm
47 kΩ / 20° C / 5 V
Unit
kV/W
kV/W
%
µV
pp
µV
pp
7
10 cm*√Hz/W
Remark
f = 1 Hz
f = 1 Hz
0.4…10 Hz / 20° C
0.4…10 Hz / 20° C
h
he / ho
X/Y
4.2
/ 0.55
2.65 / 2.4
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