YSI 5200 - Manual (Page 105)

YSI Incorporated 103 5200 Recirculating System Monitor
9.4.1 Input #1
Input #1 is a digital only input, triggered by either a switch open or a switch closed condition.
Control
Select Close to trigger the input when the contacts of an external switch close. Select Open to trigger the
input when the contacts of an external switch open.
Hold Off
Hold Off is the number of seconds that the 5200 will wait before activating a control relay or generating
an alarm. The hold off time is selectable from 0 to 255 seconds.
If the hold off time is set to “0”, the YSI 5200 will activate a control relay or generate an alarm and a page
(if enabled) as soon as the switch opens or closes. The most common application this is used for is to
detect high or low water levels using a float switch.
Alarms
The alarm system can be turned on or off. When on, an audible alarm will sound on the YSI 5200 and an
alarm page will be sent (if paging is enabled). The alarm will remain on until a key is pressed. See 7.1
Alarm Logic Flow Charts for details.
Relay
Relay Disabled
Relay Disabled is the default setting. It prevents Input #1from triggering any relays (Internal or SubNet).
Relay Internal
Select Relay internal to trigger one of the four internal relays in this 5200.
Relay SubNet
See 7.2 General Alarm, Relay SubNet.
9.4.2 Input #2
Input #2 can be set to either digital or a user defined mode. Use user defined mode to connect an external
instrument or sensor, such as the YSI 5566 TGP (Total dissolved Gas Pressure) Sensor, with an analog
recorder output to the 5200 and log the voltage or current.
Digital
Input #2 Digital selections are the same as Input #1 selections.
User Defined
User Defined mode gives you the choice of 2 Voltage ranges, 0–1VDC or 0–5VDC, or a current range of
4–20mA. The user defined menu is shown below.