Download SERVICE MANUAL VICE MANUAL

Revision B.006
Service Manual, Series 1400a Ambient Particulate Monitor
3.1.3.
EXCHANGING THE LARGE BYPASS IN-LINE FILTERS
There are two large bypass in-line filters (57-002758) used with the Series 1400a
monitor. Both large bypass in-line filters are located on the back of the TEOM control
unit: on the main and bypass flow lines. These filters prevent contamination from
reaching the flow controllers. It is most effective to replace the filters immediately
following an exchange of the TEOM filter. This allows for the exchange to be carried
out during the one-half hour flow and temperature stabilization period following the
instrument reset.
To replace the filters, remove the existing filters with their quick-connect fittings and
replace them with the new filter assemblies. Ensure that the arrows on the filters point
away from the control unit (against the flow). If the filters are installed in this way,
the user can see the dust as it is collected in the filter.
3.1.4.
TESTING AND EXCHANGING THE CPU BATTERY
The following procedure is for revision C and greater CPU boards. Contact R&P for
information regarding CPU boards older than revision C. You can find the revision
in the CPU board serial number.
3.1.4.1.
CHECKING THE STATUS OF THE CPU BATTERY
Follow these steps to check the status of the CPU battery:
✔ Always wear appropriate
antistatic devices when
working with the system’s
electronics.
1) Turn off the control unit.
2) Remove the top panel from the control unit.
3) Locate test points labeled “TP1” and “TP2” on the CPU board.
These test points are located on the front edge of the CPU board
next to the round battery.
4) Place the positive probe of the multimeter (set to DC volts) onto
TP1 and the negative probe onto TP2.
5) The battery should be exchanged if the reading is less than 2.75
VDC. The R&P part number for the battery is 12-002049.
SECTION 3: SERVICE PROCEDURES
PAGE 3-6