Thermo Scientific AquaSensors
™
AquaClear
™
Low Range Turbidimeter User Guide
34
10.
Relay (Option)
Relay A and Relay B are optional features on the AV38. Relays are Form C with normally open and normally
closed contacts – 120 Volts, 3 Amps. Connections are made with the optional terminal block on the left side
of the back panel.
When installed, configuration of relay action is accessed through the “Relay A” and “Relay B” in the main
menu.
Top-level configuration of the relays is as follows:
•
Set Function: Sets the relay function for alarm, control or wash operation.
•
Parameter: Assigns either sensor (turbidity) or temperature to the relay function.
•
Activation: Configures the relay activation setpoints, deadbands and on/off delays settings.
The activation parameters depend on which function is selected.
•
When set for ALARM the relays will activate based on the settings of low and high limits.
•
When set for CONTROL the relays will activate based on the settings of phase and a single setpoint.
•
When set for WASH the relay will activate based on programmed interval, duration and off-delay.
Alarm and Control settings allow fine-tuning of activation criteria with deadband and delay functions.
Activation parameters for Alarm, Control and Wash functions are listed in the Table 9.1
ALARM CONTROL
WASH
Set Low Alarm
Set Phase
Set Interval
Set High Alarm
Set Setpoint
Set Duration
Set Low Deadband
Set Deadband
Set Off-Delay
Set High Deadband Set Off-Delay
Exit
Set Off-Delay
Set On-Delay
Set On-Delay
Exit
Exit
Refer to the AV38 Manual for detailed relay operation and setup.
