ATI
Model A15/82 Fluoride Monitor with Auto-Calibration
28
O&M Manual
Rev-G (6/10)
ALARM RELAY
The A15/82 contains a relay designated as an alarm relay. This relay may be used to warn of various
conditions that might indicate operational problems. The relay will activate on either high or low fluoride
conditions, and can be used to indicate failure of the control relays to maintain proper control. This relay is
designated “C” on the wiring schematic, and the function of the relay with respect to its association with relays A
and B is covered in the Configuration section of this manual.
The alarm relay will always activate if either a high or low fluoride condition exists. The setpoints for this
alarm are programmable. If an alarm condition is detected, the relay will activate and the LCD display will flash
either “ALARM: MIN” or “ALARM: MAX”. The default values are 0.00 for low alarm and 10.00 for high alarm.
To program the Alarm Relay for different low and high setpoints, proceed as follows:
1.
Press the MODE key until the display show AL at the left side. The numbers shown to the right of AL are
the current set points for that relay. Note that there are two of them. This relay will activate if the
fluoride concentration goes below the low setpoint or above the high setpoint.
2.
Press the CAL key and the display will read “CAL AL L: X.XX”. Use the UP and DOWN keys to adjust
the X.XX value to the desired low alarm setpoint. Then press ENTER.
3.
The display will now read “CAL AL H: X.XX”. Again, use the UP and DOWN keys to select the high
setpoint, and then press ENTER.
4.
The display will now read “CAL AL D: 0.0s”. D represents the alarm delay. Use the UP or DOWN keys
to set the alarm delay value between zero and 25 seconds. Then press ENTER and the display will
return to the starting point for this routine.
This alarm relay may also activate if the automatic calibration function fails. If the relay is to be used in
this way, this function must be activated by changing configuration number 13 to “ON”. The default is “OFF”.
