AN-83
SS ZMT
Identification Table for ZFG2
ZGP2 General Purpose Oxygen Probe
Introduction
The ZGP2 Oxygen Probe has a high temperature oxygen
concentration cell using zirconium oxide as a solid electrolyte.
It is a second generation product developed as a result of
extensive experience in zirconia oxygen sensing systems.
The Probe is designed to measure excess O
2
concentration in
furnace atmospheres and is installed directly in the furnace. It
provides a true wet measurement of the atmosphere condition
in situ at the plant operating temperature and permits
continuous and accurate measurement over a wide range of
temperatures without the frequent maintenance and cleaning
associated with external sampling systems.
It eliminates the 'equilibrium shift' common to other systems in
which gas samples have to be cooled before measurements
can be taken and has an extremely rapid response to changes
in atmosphere, enabling fast corrective action to be taken
(particularly important in automatic control situations).
The probe can be mounted vertically or horizontally, although
for high temperature operation the vertical position is
preferred. The outer protection sheath may be supplied in
aluminous porcelain or in Incoloy 800.
An integral thermocouple is mounted within the probe
enabling temperature monitoring or automatic temperature
compensation to be made.
A gas calibration port is provided to enable the probe output to
be checked using test gas mixtures without removal from the
process. Reference air is required for accurate operation.
Principle of Operation
The detector cell is constructed from stabilized zirconia with
inner and outer electrodes attached and is specific to oxygen.
Air is supplied to the inner reference electrode to provide a
constant partial pressure of oxygen, while the process gas to
be measured is in contact with the outer electrode.
A voltage is generated across the electrodes which is a
function of the ratio of the oxygen partial pressures at the two
electrodes.
For oxygen concentration measurement, correction for the
absolute temperature of the probe is required.
ZGP2 General Purpose Probe
Code
Digits
1,2,3,4
5
6
7
8
9
10
11
12
13
Basic
Type
Number
Insertion
Length
Flange Type
Conduit
Cell
Flame
Arrester
Reference
Air
Mounting
Plate
Assembly
Entry Type
No. Off
Length
ZFG2
Zirconia
Oxygen
Probe
1
2
3
4
0.4m
(16in)
1.0m
(39in)
1.5m
(58in)
2.0m
(78in)
1
2
3
4
5
9
STD
DIN
ANSI
JIS
Model 132
Special
1
2
20mm
(0.78in)
1/2in NPT
0
1
2
3
4
None
One Std.
Two Std.
One IP65
Two IP65
0
1
2
None
6m
(20ft)
10m
(32ft)
1
2
Standard
Cell
Flow
Through
Cell
0
1
None
Flame
Arrester
1
2
Internal
External
0
1
2
None
Standard
[0.4m
(16in)
probes]
Standard
(long
probes)
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