Download Low Pressure Gas Discharge Lamps for Photoionization

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Photoionization Lamps
Low Pressure Gas Discharge Lamps
for Photoionization Detectors
Description
Features
PerkinElmer manufactures a complete
line of high quality, long life, low pressure gas discharge lamps for use in
photoionization detectors and trace gas
analyzers. These PID lamps are interchangeable with all similar lamps
presently available. Both current and
RF excited designs are available with
eV ratings ranging from 8.4 to 11.7.
• High sensitivity and stability
• Long life
• Lamp to lamp consistency
• Complete product offering
• Custom design capability
PerkinElmer incorporates a unique
high temperature seal design which
allows these lamps to be processed at
high temperatures. This process results
in higher lamp to lamp consistency,
enhanced performance and long life. It
also allows for elimination of the
getter currently utilized in competitive
RF designs.
PerkinElmer ensures unsurpassed performance by using only the highest
purity metals, window materials and
gases. Every lamp must pass a series
of stringent tests and measurements
prior to shipment to our customers.
www.gmp.ch
GMP SA
GMP SA
Siège principale: Avenue des Baumettes 17
Succursale de Zürich: Dübendorfstrasse 11a
CH-1020 Renens
CH-8117 Fällanden
+41 21 633 21 21
+41 44 825 34 00
.
Fax. +41 21 633 21 29 [email protected]
Fax. +41 44 825 34 01 [email protected]
PID Lamps
Lamp Operation
temperature. Most laboratory equipment
In low pressure gas discharge lamps, a glow
requires the lamp temperature to be elevated
Spectral Output and Relative
Intensity
discharge excites the natural resonance fre-
to as high as 250ºC. The typical lifetime of
The eV rating of the lamp is determined by
quency of the fill gas, producing spectral
lamps with magnesium fluoride windows
the lamp’s spectral output. The spectral out-
emission lines down to the short wave cut-
operated at 1mA current and a detector tem-
put of the lamp is determined by the fill gas
off of the window material. The gas dis-
perature of 250ºC is 1500 hours. Operation at
and the transmission characteristics of the
charge is confined to a small capillary within
higher temperatures and/or currents will
window material. The spectral output of the
the lamp. Precise electrode alignment allows
shorten the lamps lifetime.
gases used most frequently are shown in the
inherently ultra high stability at predeter-
During use it is typical that the outside of the
graphs below. The eV rating and wavelength
mined wavelengths.
lamp window becomes contaminated which
are associated through Planck’s Constant.
The power supply and components for opera-
results in lower output and a loss of system
tion are relatively simple. A power supply
sensitivity. PerkinElmer supplies cleaning
and a series resistor power the lamp. Lamp
kits for lamps with magnesium fluoride win-
operation occurs as the breakdown threshold
dows for the removal of any build-up on the
of the fill gas is exceeded, usually on the
window.
order of -1100 to -1299 volts DC. The series
Lamps with Lithium Fluoride windows can
resistor limits the current of the lamp to a
not be operated at temperatures above 70ºC
reasonable operating level.
and it is recommended that they be operated
l(m) = 1.2395(10-6)/eV
As seen from the graph showing krypton,
both the 123.6hm and 116.5hm lines are
present. Because of this the 10.0eV and 10.6
eV lamps are interchangeable.
at ambient temperature. The Lithium
Other fill gases such as hydrogen and oxygen
have been used but have found to result in
shortened lamp life.
Fluoride material limits the typical lifetime
Lamp Life
of these lamps to under 200 hours.
Lamp life is affected by both current and
operating temperature. At ambient temperature and 1 mA input current the lifetime of
the 10.0eV lamp is greater than 5000 hours.
This is typical for use in portable analyzers
where the lamp is not operated at an elevated
eV Ratings and Spectral Output
XENON
ARGON
KRYPTON
147.6nm
123.9nm
105.9 nm
116.9nm
129.1nm
8.4eV
10.0eV
10.6eV
11.7eV
Lamp Selection Table
PerkinElmer
Part Number
Energy
(eV)
Operating Circuit
Wavelength
(hm)
Window
Material
Figure
FX-992U
8.4
147.6
Sapphire
1
FX-791U
9.5
130.0
MgF2
2
FX-792U
9.6
129.0
MgF2
1
FK-600U
10.0
123.9
MgF2
1
FK-793U
10.2
121.6
MgF2
2
FK-794U
10.6
116.9
MgF2
1
FA-798U
11.7
106.0
LiF
2
FA-737U
11.8
105.0
LiF
1
FK-1041U
10.6
116.9
MgF2
3
FA-1090U
11.7
106.0
LiF
3
-1100VDC
R1
+
.77-8M
Figure 1
ø0.630 MAX.
(16.0)
0.020
(0.5)
ø0.703 ±0.020
(17.9 ±0.5)
Notes: (1) Wavelength (lM) = 1.2395 (10-6)/eV.
(2) Lamps per Figures 1 & 2 are DC current excited lamps.
2.00
(50.8)
Electrical Specifications
DIMENSIONS
ARE IN INCHES
(MILLIMETERS)
1.345
(34.2)
Ignition Voltage
-1100 Vdc min
Ignition Time
1–5 seconds
Operating Current
0.1–1.0 mA
Typical Operating Voltage at max current
-310 Vdc
Typical Operating Voltage at min current
-300 Vdc
Lamp Power Dissipation
0.08–0.77 W
Series Resistor in Circuit
0.77–8.0 Mohm
ø0.770 (19.6)
ø0.270 (6.9)
0.105
(2.7)
Figure 3
0.250 (6.35)
Figure 2
ø1.000 (25.4)
0.030
(0.8)
2.100
(53.34)
ø1.125 ±0.020
(28.6 ±0.5)
1.540
(39.11)
2.06
(52.3)
1.255
(31.9)
0.125
(3.2)
DIMENSIONS
ARE IN INCHES
(MILLIMETERS)
ø1.375 (34.9)
0.500 (12.7)
ø0.313 (7.9)
www.gmp.ch
GMP SA
GMP SA
Siège principale: Avenue des Baumettes 17
Succursale de Zürich: Dübendorfstrasse 11a
CH-1020 Renens
CH-8117 Fällanden
+41 21 633 21 21
+41 44 825 34 00
Fax. +41 21 633 21 29 [email protected]
Fax. +41 44 825 34 01 [email protected]
.