Emerson MRLDS-450 Installation And Operation Manual page 28

Buzzer
Enable or disable buzzer. Buzzer provides local audible alarm/fault indication.
Buzzer is enabled by default. To enable/disable buzzer:
• On the Configure tab select Outputs, then Buzzer. Select Enable/Disable and select
OK to confirm.
Relay Failsafe
Enable or disable Relay Failsafe operation. When configured for fail-safe operation,
relays are energized during normal operation. Failsafe operation ensures relays are
triggered in cases of power failure at the instrument. In Failsafe operation, normally
open and normally closed terminals are reversed as indicated in Section 3.4.3., Relay
Wiring. Relays are configured as non-Failsafe by default. To enable/disable relay
Failsafe:
• On the Configure tab select Outputs then Relay Failsafe. Select Enable/Disable
and OK to confirm.
Alarm Delay
Sets delay in minutes before instrument will indicate an alarm condition after low or
high alarm threshold has been exceeded. May be used to prevent short transient
alarm conditions from activating alarms. Alarm delays may be set for 0-15 minutes.
Alarm delay is configured as 0 minutes by default. To set alarm delay:
• On the Configure tab select Outputs then Alarm Delay. Enter the desired delay in
minutes (0-15) and OK to confirm.
Analog Zero Adjust
Analog zero adjust applies a fixed offset to the analog output. This allows removal
of small errors in the output between the gas detection instrument and the
measurement at the controller due to cable resistance when using voltage outputs.
To apply adjustment ensure instrument is outputting fixed voltage (default 1V at
zero ppm or use output test function to set specific voltage value), monitor remote
measurement and adjust zero offset until remote measurement matches expected
voltage output. Adjustment is limited to ±10% full scale. To set analog zero
adjustment:
• On the Configure tab select Outputs then Analog Zero Adjust. Use the slider to set
desired offset adjustment.
• Alternatively, select "Analog Zero Adjust (X.X%)" text and enter specific offset
required (-10 to 10).
24 • MRLDS-450 Refrigerant Gas Detection I&O Manual 026-1316 Rev 0