Annunciator Dual Sensor Differential Inputs
From EMIT Controls
Revision as of 22:33, 4 August 2022 by Thomas Peterson (talk | contribs)
The annunciator has the ability to use two analog inputs to calculate a differential value on a third input. For example, this setup might be used:
- AI-1: Discharge Pre-Filter, 0-100 PSI
- AI-2: Discharge Post-Filter, 0-100 PSI
- AI-3: Discharge filter differential, -100 - 100 PSI
In this scenario, AI-1 and AI-2 would both be connected to the pressure sensors. AI-3 would not be physically connected to anything, but would calculate the differential value for display, alarms, logging, etc.
Setup
A differential input is setup through the following steps:
- Set up both "Source" sensors normally.
- Both source sensors must have the same type (4-20mA, 1-5V or 0-5V) and range
- Select a third analog input for the differential calculation. On this input's setup, select 'Diff' as the sensor type.
- The low/high range buttons will change to 'Low Sensor' and 'High Sensor'. The Diff value calculated will be the 'High' sensor - 'Low' sensor. If the 'High' sensor is lower than the 'Low' sensor, the differential will be negative
- Alarms, gauges, etc., can be used normally for either or both source sensor and the differential sensor. Alarms are not required for each.
