LTH Electronics MTD75, Руководство по эксплуатации

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Digital Inputs
MTD75 Operation Guide - 147 -
Digital Inputs
Digital Inputs
The MTD75 features 5 digital inputs, the instrument can be configured to initiate the appropriate
action when a contact either closes or opens between the input pin and the reference pin.
Water Meter Input (Digital Input 1)
The terminal marked “1” is provided for contact to a standard water meter where contact activation
indicates the flow of water. The ‘K’ factor for the water meter can be set in the “Configuration” menu
(see page 151). The polarity of this input (NO/NC) can be set in the digital input 1 menu.
Flow Switch Input (Digital Input 2)
The terminal marked “2” is provided for connection to a flow switch in the process loop to indicate
when there is no water flow past the sensors. When activated this will flag an error message on the
main display and inhibit any dosing which is using a sensor input as its trigger source. The polarity of
this input (NO/NC) can be set in the digital input 2 menu.
Digital Inputs 3-5
Digital inputs 3-5 provide a user configured system to set the associated relay to either Offline or
Interlock, indicate that there is a chemical Tank Level issue, or to activate a Remote Dose or Bleed of
the relay.
Main Menu
From the front screen press the menu button to show
the main menu options and select Digital Inputs.

/

– Select Option
EXIT – Return to Calibration
– Enter Option
Digital Inputs Setup
Select the Digital Input you wish to edit.
The status of the Digital Input is also shown to the left
of each item.
– Digital Input Inactive
– Digital Input Active

/

– Select Option
EXIT
– Return to Main Menu
– Enter Option