(If unable to obtain this message on display, please refer to section on troubleshooting.)
Remove the protective cap from the sensor's membrane cap.
Check level of electrolyte.* Hold the sensor vertically with the membrane cap facing up. View
electrolyte level through pressure port window.
Ensure that the sensor is securely mounted.
Ensure that the sensor leads are connected to the analyzer at the proper terminals and that power is
connected to the unit.
Stabilize the system by turning on the power and turning the range/function switch to 0-1 ppm. The
sensor will stabilize in sample in about 30 minutes.
Always allow the sensor to reach temperature of the sample before calibrating or taking readings. If a
large temperature difference exist, allow at least 10 to 15 minutes for the sensor to reach equilibrium.
The sensor will remain polarized as long as it is connected to the analyzer.
Check the calibration of the instrument: The instrument has been calibrated at the factory
before shipment. It is a good idea, however, to check the calibration since rough handling or
prolonged storage may have changed the original calibration. See Calibration Section, for detailed
As mentioned in an earlier section, Chlorine sensors require a flow of fresh sample past the tip for accurate
operation. This may be accomplished by one of two methods: (1) the use of a No. 812A-111 Agitator OR (2) a
naturally-fast moving body of water.
*Unless otherwise specified the sensors are filled with electrolyte at the factory and are ready for use.