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Instruction Manual
IM-106-340AC-1, Rev. 1.0
April 2005
SPS 4001B
4-6
PRESSURE SWITCH
REPLACEMENT
Use the following procedure to replace pressure switch (16, Figure 4-1).
1. Remove the SPS 4001B chassis from the enclosure according to the
instructions in "Remove/Install Chassis".
2. Remove lead wire terminals from pressure switch (16).
3. Use a 1-1/16 in. 6-point socket to loosen and remove switch (16).
4. Install new pressure switch (16). Be careful not to overtighten. Connect
the leads to the pressure switch terminals. Polarity does not matter.
5. Install the SPS 4001B chassis in the enclosure according to the
instructions "Remove/Install Chassis".
CHECK VALVE
REPLACEMENT
The check valve (Figure 1-3) may stick or become plugged over time.
Replace when necessary. If condensation deposits are noted upon removal,
consider insulating the check valve.
PRESSURE
REGULATOR
MAINTENANCE
The reference air pressure regulator (22, Figure 4-1) is factory set to 20 psi
(138 kPa). If necessary, use the knob on top of the pressure regulator to
readjust the pressure setting. Refer to "Remove/Install Chassis" to access the
pressure regulator for adjustment.
FLOW METER
ADJUSTMENTS
Calibration Gas Flow Meter
Calibration gas flow meter (26, Figure 4-1) regulates the calibration gas flow.
The flow meter requires readjustment only after installing a new diffusion
element on the Oxymitter 4000 probe. Adjusting the flow meter at any other
time can pressurize the cell and bias the calibration.
In applications with a heavy dust loading, the O
2
probe diffusion element may
become plugged over time, causing a slower speed of response. The best
way to detect a plugged diffusion element is to note the time it takes the
Oxymitter 4000 to return to the normal process reading after the last
calibration gas is removed and the calibration gas line is blocked off. A
plugged element also can be indicated by a slightly lower reading on the flow
meter.
Change the diffusion element when the calibration gas flow meter reads
slightly lower during calibration or when the response time to the process flue
gases becomes very slow. Each time the diffusion element is changed, reset
the calibration gas flow meter and calibrate the Oxymitter 4000. For more
information on changing the diffusion element, refer to the instruction manual
for the Oxymitter 4000 in use.
Reference Air Flow Meter
Reference air flow meter (25) regulates the reference air. Adjust the flow with
the knob on the bottom of the reference air flow meter when necessary.
When installing the pressure switch, do not overtighten. Damage to the solenoid may occur.