S – 150 Controller User Manual
MKTF – 429-A 22 08/16
Tank Low
When the tank low input has been active for five seconds, the auxiliary output will turn off. The alarm
lamp will light and the TANK LOW warning message will show on the display. When the tank low
condition clears, the TANK LOW 99 warning message is displayed. The number is the delay in minutes
before the auxiliary relay will energize.
For boost pump operation, when the tank low input has been active for five seconds, the boost pump
output will turn off, the RO unit will shut down, the alarm lamp will flash and the audible alarm will
sound. TANK LOW shutdown message will show on the display. When the tank low condition clears,
the TANK LOW 99 shutdown message is displayed. The number is the delay before the RO unit will
restart. The shutdown can be manually reset by pressing the Alarm Silence/Reset button twice.
Boost Pump Output
Relay 1 can be used to control a boost pump when the expander board is configured to operate Relay
1 as a boost pump relay. This relay will operate the same as the inlet solenoid relay. This option is
used to directly operate a boost pump up to 1HP.
Divert Output
When Relay 1 or Relay 2 has been programmed to operate as a divert relay, the relay will energize
when the TDS / Conductivity exceeds the TDS / Conductivity Limit Setpoint. This will occur as soon as
the reading exceeds the limit, there is no delay. When the reading drops below the limit and stays
below the limit continuously for five seconds, the divert relay will turn off.
Alarm Output
When Relay 2 has been programmed to operate as an alarm relay, the relay will energize whenever a
warning or alarm condition occurs. The relay will remain energized as long as the warning / alarm
condition is active.
ADJUSTMENTS
TDS / Conductivity Calibration
Refer to Figure 2 for adjustment location. To calibrate the TDS / Conductivity, place the cell in a known
standard solution. Adjust the span adjustment for the correct reading. If the cell is installed, the unit can
be calibrated by taking a sample of the permeate water and testing it with a known, good meter. Adjust
the span control until the reading matches the meter.
NOTE: If the TDS / Conductivity range is changed, the unit must be recalibrated and some components
may need to be changed.
Display Adjustment
The display contrast can be adjusted for best viewing by adjusting control R3. This control is located
toward the upper right corner of the board, just to the left of the cell connector.
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