Check Valve Replacement; Pressure Regulator (Optional) Maintenance; Flowmeter Adjustments; Flowmeter Replacement - Emerson ROSEMOUNT Analytical SPS 4000 Series Instruction Manual

Instruction Manual
IB-106-340AC Rev. 1.3
January 2003
k. Install manifold cover (28), and secure with
manifold cover lock (21) and screw (22).
l. Turn on the calibration gases at the
cylinders.
4-6

CHECK VALVE REPLACEMENT

The check valve may stick or become plugged
over time. Replace when necessary. If conden-
sation deposits are noted upon removal, con-
sider insulating the check valve.
4-7 PRESSURE REGULATOR (OPTIONAL)
MAINTENANCE
a. Pressure Adjustments
Reference air pressure regulator (1, Figure
4-1) is factory set to 20 psi (138 kPa). Ad-
just using the knob on top of the pressure
regulator if necessary.
Do not use fingers to release valve
stem. The valve may release air at high
pressures and cause injury.
b. Condensation Drain
To drain excess moisture from the filter bowl
of reference air pressure regulator (1), use
a screwdriver or comparable tool to periodi-
cally release the valve stem on the bottom
of the pressure regulator.
4-8

FLOWMETER ADJUSTMENTS

a. Calibration Gas Flowmeter
Calibration gas flowmeter (46, Figure 4-1)
regulates the calibration gas flow and must
be set to 5 scfh. However, only adjust the
flowmeter to 5 scfh after placing a new dif-
fusion element on the end of the Oxymitter
4000. Adjusting the flowmeter at any other
time can pressurize the cell and bias the
calibration.
4-6 Maintenance and Service
In applications with a heavy dust loading,
the O probe diffusion element may become
2
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 cali-
bration 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 flowmeter.
Change the diffusion element when the
calibration gas flowmeter reads slightly
lower during calibration or when the re-
sponse time to the process flue gases be-
comes very slow. Each time the diffusion
element is changed, reset the calibration
gas flowmeter to 5 scfh and calibrate the
Oxymitter 4000. For more information on
changing the diffusion element, refer to the
instruction bulletin for the Oxymitter 4000 in
use.
b. Reference Air Flowmeter (Optional)
Reference air flowmeter (45) regulates the
reference air and must be set to 2 scfh.
Adjust the flow with the knob on the bottom
of the reference air flowmeter when
necessary.
4-9

FLOWMETER REPLACEMENT

Use this procedure to replace either reference
air flowmeter (45, Figure 4-1) or calibration gas
flowmeter (46).
a. Turn off power to the system.
b. Shut off the calibration gases at the
cylinders.
c. Loosen, but do not remove, four screws
(42) securing flowmeter bracket (50) to
mounting bracket (3).
d. Flex the bottom of flowmeter bracket (50)
downward and away to disengage and re-
move the flowmeter bracket from mounting
bracket (3).
Rosemount Analytical Inc. A Division of Emerson Process Management
SPS 4000