Aquametrix 2300 Multi-Input Controller User Manual - Manual (Page 21)

N116-133 AquaMetrix 2300 Installation and Operation Manual Page 21
Monitors for the other probes. The Period Counter Alarm will go off each time a multiple of
the set total is reached if the Totalizer is set up with a K Factor or linear scaling. Use of the non-
linear scaling feature allows for more complex functions of this Periodic Counter Alarm.
4.2. Configuring Differential Sensors
The Differential Sensor is an option for the probe type in the Probe Configuration Wizard. It
combines two pre-existing analog or digital probes and performs a subtraction operation
between them, displaying the resulting differential value as a separate, virtual, probe. Thus,
there are 3 readings on the controller for two actual probe inputs. A typical application would
be to measure the difference of flow before and after a valve, or a difference in temperature.
The differential sensor may be scaled after the subtraction and units assigned to the resulting
value just like another probe. Similarly, controls and alarms may also be assigned to the
differential value. Be aware that the difference value is already scaled from the input current
values, so that further scaling is liable to provide non-meaningful values. We recommend
using either No Scaling or Scale Factor scaling. The difference value may be either positive or
negative.
The differential sensor may be edited but the original two inputs it is based on are fixed in its
definition. To change one or both inputs, delete the differential sensor in the main Probe
Configuration menu and define a new one.
4.3. Configuring a Flow Sensor for Batch Control
The Dispenser Probe option allows the 2300 Controller to function as one to four complete
batch controllers. There are two types of Dispenser Probes selectable in the 2300 Controller.
Both are used to monitor a flow in order to dispense a fixed volume of fluid. The vast majority
of users will select the Manual Start Dispenser, which initiates the flow (via a relay) based on
input from a contact switch closure. The Flow Dispenser initiates the flow based on a
monitored value of one of the analog inputs to the 2300 Controller. This allows triggering of
the flow based on a pH, temperature, conductivity, or other parameter being exceeded. Both
Dispensers have a user-set time delay after the relay is shut off before allowing a new trigger
event.
After selecting the Manual Start Dispenser as Probe Type in the New Probe Wizard, a Start
Digital Input window allows the user to select any of the available three Digital Inputs, four
Contact Inputs, or by Keyboard Input Only. In the same window, the flow input that controls
the volume dispensed is also selected from one of the analog probes or digital/flow probes.
This flow input may or may not be selected from a flow channel previously set up.
The Wizard starts from here, with Instructions on page one, Information on page two, Scaling
on page three, Probe Description on page four, and Dispenser Control Configuration on page
five. Dispenser Control determines the value of the target volume or total, the relay to
activate, and the delay time before the function is active again.
The Flow Dispenser is set up in similar fashion, the main difference being that the trigger is a
preconfigured value from one of the analog probes. Only high values are available, but all of
the high alarm and high control functions that are then-currently set up in the 2300 Controller
are available to the user to choose from the pull down menu on the Probe Select page.