3-12 | Model 933S UV Analyzer
Electrical Connections
The nominal operating voltage and power consumption is indicated on a
label on the front of the Ex d Lower Enclosure. Verify that the operating
voltage indicated on the label agrees with the operating voltage indicated
on the documentation supplied with the analyzer.
For Division 1/Zone 1 Installations, all cable entry glands (one
power cable entry and two signal cable entries) into the flameproof
enclosures must be Ex d certified. Conduit or cable seals that comply
with the flameproof enclosure cable entry sealing requirements of the
local authority must be installed at the entries to the enclosure. In all
cases, each unused cable entry port must be plugged with a certified
Ex d plug.
Refer to “Electromagnetic Compatibility (EMC)” near the beginning
of this manual for information about the EMC Directive regarding
techniques and wiring practices to be followed.
To maintain EMC compliance in European installations, AMETEK
recommends using metallic glands and shielded cable (at least 85 %
coverage) for both power and signal cable connections.
Input/Output Signal Connections
The analyzer can be configured with up to four (4) current output signals.
The following inputs/outputs are supplied with the analyzer as standard:
• One digital input for remote zero.
• One digital input for Alarm Enable/Disable Concentration Alarms
(must be terminated with a jumper or closed contact for the alarms to
be enabled).
• Four (4) non-isolated voltage outputs.
If connecting one or more of the analyzer non-isolated voltage outputs
to an external device, a 15 Volt Zener Diode must be connected across
the positive and common terminals of each non-isolated voltage out-
put channel at J108 of the Customer I/O board (Part No. 100-1758).
• One isolated current output.
• Minimum 250 Ohm impedance in series of the analog loop (up to a
maximum 1000 Ohm load).
!
WARNING
NOTE
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