Products > BMS Analogue 4-20mA

The 4-20mA Analogue output feed is an optional module for the System5 Base or System5 BasePlus unit.

The function of the BMS unit is to provide external outputs for alarms or other measurement devices. Each BMS module has two analogue (4-20mA) outputs and two digital (switched relay) outputs.

PC Software (the IceSpy System5 ‘Adjust’ application) is able to associate these outputs with specific sensors which are being stored in the Base, and (in certain cases) specific logical zones that sensors may be allocated to.

Analogue Outputs

The analogue output is proportional to the value returned by the associated sensor. The minimum and maximum value is calculated as follows:-

• Output of each channel is 20mA (i.e. high) if the current (latest) recorded value for that sensor is equal to or higher than the ‘MaxAxis’ value for that sensor (also set up via PC ‘Adjust’).
• Output of each channel is 4mA (i.e. low) if the current (latest) recorded value for that sensor is equal to or lower than the ‘MinAxis’ value for that sensor (also set up via PC ‘Adjust’).
• Note that these outputs are related to Max and Min possible range values, and not to alarm values for a sensor.

Digital Outputs

• For defined sensor, the output of each channel is ‘closed’ if the current (latest) recorded value for that sensor is higher than the ‘High Alarm’ value for that sensor, and has been so for longer than the ‘Alarm Delay Time’ for that sensor (also set up via PC ‘Adjust’).
• For a defined sensor, the output of each channel will be ‘open’   if the current (latest) recorded value for that sensor is lower than the ‘Low Alarm’ value for that sensor, and has been so for longer than the ‘Alarm Delay Time’ for that sensor (also set up via PC ‘Adjust’).