YOKOGAWA ZR Series Specification sheet

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ZR Series Quick Tip
Technical Note
Filters for Oxygen Probes
Many industries use avariety of fuel sources such as natural gas, coal, oil, trash,
and biomass to fire their processes.When burned, coal and biomass release a
significant amount of carbon particulate known as fly ash.This fly ash can plug the
zirconia cell, resulting in aslow response or no response to changes in the oxygen
concentration.
Self-Cleaning Fly Ash Filter (M1234SE-A)
The self-cleaning fly ash filter (M1234SE-A) is asintered filter that incorporates an
aerodynamic shield to deflect the particles and prevent fly ash build-up from
plugging the ZR22 Oxygen probe.This filter should be used whenever coal or
biomass is the primary fuel source.
•Filter material: Hastelloy X
•Base material: 316 SS
•Max. O.D.: 6.35cm (2.5in)
•Max. operating temp: 700˚C (1292˚F)
•Pore size: 10 micron
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AIR FLOW
TOP VIEW
END VIEW
SIDE VIEW

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ZR Series Quick Tip: Filters for Oxygen Probes
Standard Installation of the Self-Cleaning Fly Ash Filter (M1234SE-A)
*Note: Prior to installation, clean the ZR22G detector end with a wire brush to remove any ash or dust.
1. Slide the closed end of the filter
shield over the end of the probe
approximately nine inches.
2. Slide the filter element over the detector
and into the space between the detector
and the shield approximately eight inches.
This may be asnug fit, and might
require afirm push;however, the filter
should not be forced onto the detector.
3. Slide the end of the
shield over the filter.
4. Align the shield so it protects the
filter element from direct gas flow.
The shield should cover the filter
and be flush with the closed end of
the filter, as shown.
5. Tighten the clamp screw until the filter cannot be moved by hand.
•The screw should not be tightened beyond this point.
•Over-tightening the assembly can damage the detector and filter.
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SHIELD
FILTER SHIELD
FILTER
SHIELD
DIRECTION
OF
FLOW
*NOTE: When using the M1234SE-A self-cleaning fly
ash filter in conjunction with the ZR22Rprobe
protector, repeat the steps above, but invert the
M1234SE-A shield away from the direction of flow.

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ZR Series Quick Tip: Filters for Oxygen Probes
Dust and Oil Filter (E7042UQ)
The dust and oil filter attaches to the end of the
ZR22 oxygen probe,and is used for oil fired
applications as well as black liquor recovery
systems.The filter (E7042UQ) utilizes a silicon
carbide (SiC)filter disc enclosed in a316SUS
cylinder.Once installed, the filter will have the
same outside diameter as the ZR22 oxygen probe
(as shown).
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Dust and Oil Filter Installation (E7042UQ)
1) Remove the bolts, washers, plate, calibration tube and filter screen that hold
the zirconia cell in place.
2) Remove the zirconia cell and metal o-ring.Ensure that when removing the
zirconia cell, it is rotated in the direction etched on the face of the cell.
(should be clockwise).Failure to do so may damage the contact spring.

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ZR Series Quick Tip: Filters for Oxygen Probes
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3) Do not re-use the metal O-ring.The dust and oil filter
comes with anew metal O-ring that should be used.
Replace the zirconia cell (ensuring that the cell is
rotated clockwise as it is inserted), plate, calibration
tube, and filter screen.
4) Align the notch on the E7042UQ dust and oil filter
with the calibration tube.
5) Apply anti-seize compound to the bolt threads.
Insert the bolts andtorque to 51 in/lbs.
The E7042UQ dust and oil filter installation is now
complete. The ZR22 Oxygen probe can now be installed.