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NOTES
3. Connect the sample gas source to the sample inlet fitting (1).
4. Connect the sample or separate reference source to the dryer input. Connect the dryer output
to the reference inlet fitting (2).
5. If internal mass flowmeter (optional) is installed in analyzer, proceed to step 6. Otherwise,
connect supplied rotometer to cell exhaust port.
6. Connect bypass exhaust (3) and cell exhaust (4) fittings to appropriate vent system.
7. If live pressure input is being used for output in dewpoint temperature or water vapor pressure,
connect pressure transmitter output (10 Vdc, maximum) to the Analog Input terminals (12).
Electrical Connections
1) The 2850 is shipped with the fuse value and voltage select P14 jumper pre-installed for the mains line
voltage ordered by the customer (i.e. 115 vs. 230 Vac, nominal). To inspect theses parts, first ensure
that the power has been removed from the unit. Removing the rear panel of the power junction
box allows access to the fuse. Remove the fuse block assembly from the power inlet/line filter by
using a small flat blade screwdriver to first pry the hinged cover away and then to pry out the fuse
holder as indicated in Figure 5a. One fuse should be in place, and must be a 2 Amp Fast blow for
100 - 120 Vac mains and a 1 Amp Fast blow for 200 - 240 Vac use. Return the keyed fuse block to its
former position and snap shut the protective cover of the power inlet.
The voltage selection jumper can be viewed by first removing the main top cover of the unit. Locate
the long, centralized circuit board with many cables plugged into it (Backplane Board). At the rear
end of the this board, is a four pin connector labeled "Voltage Select" and is designated J14. Plugged
into this connector will be P14 - a four position plug, with wire jumper(s). Refer to Figure 5a to
identify this jumpered connector with one of the two voltage select jumper configurations shown.
If your unit is equipped with a different (older, non-European) type of power inlet, see Figure 5b
for voltage and fuse identification.
!
WARNING
When the Analyzer is used in Class 1, Div 2 areas, the 2850 must use three feet (91m) of non-detachable,
extra hard usage AC power cord, pre-terminated and strain relieved at the unit.
3-6 2850 Moisture Analyzer
Failure to complete the above step may result in damage to the analyzer not covered by
warranty.
This configuration must not be altered by the operator! Only qualified service person-
nel may access the interior of the unit to change or inspect this setting and fuse. The
rear panel label must be clearly re-marked to indicate any new AC source informa-
tion. If qualified personnel are not available to perform these tasks, contact AMETEK
Service.
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