Relay Setup - Hach sc1000 User Manual

5.4.3 Relay Setup

Select RELAY MODULE
Select RELAY 1–4
SELECT SOURCE
Select the signal source.
SET PARAMETER
Select the appropriate parameter.
SET UNITS
Select the units of measurement.
SET FUNCTION
Select the source set to the Sensor. Menu options depend on the parameter selected.
Alarm: Operates relays in response to the measured parameter. Contains separate High and Low Alarm points,
deadbands, and ON/OFF delay.
Feeder Control: Operates in response to the measured parameter. Can be set for phasing, set point, deadband,
overfeed timer, and ON/OFF delay.
2 Point Control: Operates in response to the measured parameter using two setpoints.
Warning: Activated when the analyzer detects a sensor warning.
PWM Control: Allows the relay to provide a duty cycled output.
Freq. Control: Allows the relay to cycle at a frequency between the minimum pulses per minute and maximum pulses
per minute.
Timer: Sets the timer for a cleaning cycle (or equivalent). Controls the output hold, interval, duration, and off delay.
SET TRANSFER
Normally, each control or alarm relay is active, responding to the measured value of its assigned parameter. During
calibration, however, the relay can be transferred to a preset on/off state to suit the application requirements. Select
Energize or De-energize.
Function set to ALARM
HIGH ALARM—Sets the value where the relay will turn on in response to increasing measured value.
LOW ALARM—Sets the value where the relay will turn on in response to decreasing measured value.
HIGH DEADBAND—Sets the range that the relay remains on after the measured value decreases below the high alarm
value.
LOW DEADBAND—Sets the range where the relay remains on after the measured value increases above the low alarm
value.
ON DELAY—Sets a time to delay the relay from normally turning on.
OFF DELAY—Sets a time to delay the relay from normally turning off.
INPUT VALUE—Current reading for the sensor.
Function set to FEEDER CONTROL
PHASE—High phase assigns the relay setpoint to respond to an increasing measured value. Low phase assigns the relay
setpoint to respond to a decreasing measured value.
SET SETPOINT—Sets the point where the relay will turn on.
DEADBAND—Sets the range where the relay remains on after the measured value decreases below the setpoint value
(high phase relay) or increases above the setpoint value (low phase relay).
ON DELAY—Sets a time to delay the relay from normally turning on.
OFF DELAY—Sets a time to delay the relay from normally turning off.
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