Pulse Instruments
System 4 Manual
Version 1.6
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8. Troubleshooting
Guides
Alarm is an indication of malfunction. An alarm occurs when the pH and ORP values deviate
beyond the alarm range set on the operator interface, or if it takes greater then thirty minutes to
adjust the water chemistry. In the alarm mode the strobe light is on and so is the audio horn
(unless it has been turned to silence position). The chemical feed mode is immediately
interrupted until the RESET button is pushed which reactivates normal operation.
8.1
Control system failed
If the control system failed to work, such as pumps are not pumping when they are supposed to,
you can reset the PLC to fix this problem. If by resetting the PLC does not fix the problem, please
contact the factory.
To reset the PLC located on the back plate inside
of the control panel, toggle the switch to STOP (to
the right), then to RUN (to the left without
stopping in the middle). Finally, position the
toggle switch to TERM (to the middle).
8.2 Sensor
Failed
Unscrew the sensors from the threaded holder and place in known calibration standards. Place
the pH probe in pH 7.00 and 4.00 solutions. Place the ORP probe in 468 mV solution. The
readings on the control panel should match or should be close. Follow calibration procedure. If
sensors are too far off the standard readings, follow maintenance procedure as described in
Section 7.
8.3
Sensor Cable is Damaged
Follow the sensor cable carefully along its length and check for any cuts, breaks, or tight kinks. If
the cable is damaged, replace the sensor.
8.4
Sensors Need Maintenance
If other parameters seem normal but the readings seem abnormal in calibration standards,
service the sensors. Take a 1:100 diluted solution of acid to water in a cup and place the sensor
front tip in the solution at least 2 inches deep for a minimum of five to fifteen minutes.
Place the pH electrode in a cup of pH 7.00 or pH 4.00 solution. The pH controller should read te
corresponding value on the display. The ORP electrode normally does not drift out of calibration,
however a checking solution at 468 mV is supplied to serve as a check. Please follow the
instructions in Section 7.2 to calibrate the controller.
8.5 Controller
Failed
In normal operation, when the display reading is above the set point level for acid control, the acid
pump is turned on and when the reading reaches a set point it the pump turns off. During the
