YSI 5200A - Manual (Page 32)

YSI 5200A
63
YSI 5200A
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Figure 3.30
Notes:
- Calibrate sensors prior to use. See calibration - page 74.
- CAUTION : Do not ground the probe body.
Lightning and Surge Protection
AC line voltage surge suppressors protect field equipment on any AC line-to-ground
from damage due to electrical transients induced in the interconnecting power lines
from lightning discharges and other high voltage surges. Surge protection devices
are strongly recommended to protect your equipment from secondary surges and
lightning on outdoor installations. Follow the recommendations provided when
choosing and incorporating surge protection devices into your operation:
Recommendations:
• Surge suppression devices should be located on the AC line supplying
power to the 5200A and any signal lines connecting the 5200A.
• The unit should include noise filtering, common mode, and normal mode
suppression and nanosecond reaction time.
• Surge suppressors should be internally-fused to remove the load if the unit
is overloaded or the internal protection fails.
• Signal line suppressors protect low voltage signals and relay outputs from
damage due to electrical transients induced in the signal lines from light-
ning discharges or nearby electrical devices.
Installation and Wiring
• Signal line suppressors should be installed at each end of an analog loop.
• Relay outputs should be protected at the receiver end.
• Signal line suppressors should consist of a three-element gas tube followed
by metal oxide varistors and suppressor diodes.
• The protective elements should be matched such that high-energy surge
voltages trigger the gas surge arrester, while low energy or surge voltages
affect the MOV’s and suppressor diodes.
• Lightning protection devices should be located as close to the 5200A as
possible and wired in accordance with the National Electric Code in ap-
proved watertight enclosures.
CAUTION: This or any other installation procedure cannot protect against a
direct lightning strike. YSI Incorporated cannot accept liability for damage
due to lightning or secondary surges.
Sealants, Desiccants, and Securing 5200A
Environmental conditions can promote the formation of condensation in and around
the 5200A. It is very important to follow the steps below to prevent damage to the
electronic components and to extend the life of the 5200A system.
1. Place solid rubber grommets in bulkhead fittings that have no electrical
connections.
2. If using optional conduit fittings (YSI p/n 065926UL) in place of bulkhead
fittings, industrial encapsulant (YSI p/n 065921 conduit sealer) must be
used to prevent moisture from entering the 5200A enclosure. Apply the
sealant after all wiring and connections are complete. Failure to use in-
dustrial encapsulant may result in damage to the 5200A.
3. Desiccant pack must be replaced whenever the 5200A enclosure is opened
(Desiccant pack, YSI p/n 006506). Desiccant absorbs moisture captured
within the enclosure.
4. Ensure that the rubber gasket is seated between front panel and enclosure
whenever enclosure is closed.
5. Replace the front panel ensuring that the ribbon cable is not trapped in
the gasket channel before inserting mounting screws.
6. Tighten mounting screws, making sure not to cross thread. The screws are
stainless steel and the receiving threads are brass. Do not over-tighten!
WARNING: The 5200A utilizes sensitive solid-state devices that can be dam-
aged by static shock. Installers must observe accepted ESD (Electro-Static
Discharge) procedures while connecting cabling to the 5200A I/O plate or
any other internal component or damage may result.
Installation and Wiring