be programmed to pulse a remote totalizer or telemetry system. OnTm (flow applications only) - if you
want the relay to pulse once it is activated, this menu sets up how long the relay pulses. Setting OnTm to
0 turns off the pulsing function.
4. Time relay activation is based on time. For example, every 90 minutes a relay will change status to
pace a wastewater sampler based on time.
5. If a temperature compensation probe is used with the transducer, Tmp relay activation sets up the
relay or setpoint to activate on temperature changes.
Note: See Figure 10c: Transducer Menu for information on setting the threshold time for echo loss.
Figure 22: Set Point Example
Example: Following is an example of the use of Val, Dead, and Hi/Lo for a level application.
• A vessel with a 20’ Span operating in Material Level mode has Value for setpoint 1 (SP1) set at 19’. The
Hi/Lo function is set to Hi and the deadband (Dead) is set at 2’. When the contents exceeds 19’, the
setpoint energizes, activating a pump to remove material from the vessel. The pump continues to
operate until the setpoint de-energizes at a level of 17’ (19’ minus the 2’ deadband).
•
This vessel has Value for setpoint 2 (SP2) set at 3’. The Hi/Lo function is set to Lo and the deadband
(Dead) is set at 1’. When the contents go below 3’, the setpoint energizes, activating a pump to fill the
vessel. The pump continues to operate until the setpoint de-energizes at a level of 4’ (3’ plus the 1’
deadband).
33 ADD (THE RELAY IS ADDED TO THE CHANNEL DISPLAY PRIOR TO ENTERING THE MENU)
This menu is used to add setpoint channels (up to eight) for the current channel. Note that the setpoint must be
added before the Set parameters (Val, Dead, etc.) can be input. The bottom line of the display shows the slot
number of the Relay Output PCB and the channel number for the first available setpoint on the Relay Output
PCB. Pressing the Up and Down Arrow Keys cycles through all other unassigned setpoint channels. Pressing the
Enter Key adds the setpoint.
34 DELETE
This menu allows previously added setpoint channels to be removed from the current channel. The top line of the
display shows an assigned setpoint number. The bottom line shows the slot number of the Relay Output PCB
and the channel number for the setpoint on the Relay Output PCB. To delete a setpoint channel, cycle through
58
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SON280020 Rev. C
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