YSI 5200 - Manual (Page 102)

YSI Incorporated 100 5200 Recirculating System Monitor
NOTE: Allow enough time to clean the probes or provide tank maintenance without breaching any
control or alarm conditions.
9.2.3 Alarm Hold Off
The Alarm Hold Off timer prevents any system parameter (DO, pH, etc.) from generating an alarm or
page until the hold off time has expired.
NOTE: The Auxiliary Inputs each have separate Hold Off timers. See Section 9.4.1 Input #1, Hold Off.
9.2.4 Timers 1–4
Use Timers 1–4 to control external devices, such as a lighting system. Each timer has one ON and one
OFF time per 24-hour period.
For example, in your application you may wish to use a combination of metal halide, fluorescent, and
incandescent lighting. Each lighting system may require a dedicated ON and OFF time. The YSI 5200
lighting system can manage these and other various timing needs.
Example Lighting Scheme
Timer 1 is for the fluorescent lamps. These lamps are the first lights to come on in the morning and the
last to go off late at night.
Timer 2 is for the metal halide lamps. To approximate the sun rising, these lamps come on in the late
morning and go off in the late afternoon.
Timer 3 is for an additional halide lamp. This lamp will come on for about one to two hours at noon to
simulate the midday sun.
Timer 4 is for a red bulb during the night to allow observation of nocturnal creatures that come out when
the lights are out, and or moonlight simulation.
9.3 Relay Output Wiring
The four (4) output relay connections are made (using YSI 065944UL Pluggable Socket Connector)
through terminals 1 through 12 of the 12-pin connector located at the top of the I/O plate. See Figure 3-8
I/O Plate. Relays may be wired normally open (N.O.) or normally closed (N.C.). Use appropriate wire in
terms of gauge and insulation to adequately handle the voltage and current being switched by the relays.
See Section 15 System Specifications for relay specifications. Do not use the primary 12 volt power
source as a source for any of the relays in the 5200 system. Remember that relays are intended to activate
alarms, lights, pumps and similar devices. The relays are not intended to switch heavy loads above the
current rating of the relay.
WARNING: If any of the relay contacts are connected to a "hazardous-live" circuit, ALL contacts on
ALL relays must be considered "hazardous live" and appropriately protected from user contact outside the
5200 enclosure.
A snap on ferrite assembly, YSI# 655365, is included with the 5200 Monitor. Wires being connected to
relay terminals need to be routed through this ferrite as shown in Figure 3-9. Failure to do so could cause
catastrophic monitor failure.