User Guide Heavy Duty Dissolved Oxygen Meter Model 407510
Introduction Congratulations on your purchase of Extech's Heavy Duty Dissolved Oxygen / Temperature Meter which simultaneously displays Dissolved Oxygen or Oxygen in air, and Temperature. Units of o o measure are mg/l for Dissolved Oxygen, % for Oxygen in air, and C/ F for temperature. Oxygen is measured with a remote sensor that also contains a thermistor for measuring temperature. Advanced features include RS 232 PC serial interface, data hold, auto shut off, and Min/Max/Avg recording.
Getting Started Note: The dissolved oxygen probe assembly may be shipped to you from the factory dry. If the probe does not contain electrolyte solution, refer to the Electrolyte Replacement section of this manual for the instructions for adding the electrolyte solution prior to initial use. Filling the Electrolyte Container Prior to Initial Use 1. 2. 3. 4. Unscrew and remove the electrolyte container from the tip of the probe. Fill the electrolyte container with new electrolyte.
Dissolved Oxygen (DO) Measurements Measurement Preparation Before taking measurements, perform the calibration described above if necessary. In addition, perform the % SALT and ALTITUDE compensation adjustments as described below: % SALT Compensation Slide the O2/DO switch to the DO position. If the measured liquid is pure water or is known not to have a salt content, set the % Salt factor to 0%. 1. Press the % Salt key.
Advanced Features Data Hold Press the Data Hold key to freeze the displayed value. The LCD will display DH for Data Hold mode along with the held reading. Press the Hold key again to release the data hold function. MIN/MAX/AVG Data Recording When selected, the Data Recording function records the Min, Max, and Average readings. To start a data recording session: 1. Press the RECORD key once.
Probe Head Replacement The probe head on the tip of the probe holds a thin Teflon® membrane and an electrolyte container. Calibration or reading errors could indicate loss of electrolyte or a dirty/damaged membrane. The membrane is very delicate and can easily be damaged if it comes in contact with solid objects. Replacement probe heads are available from your local distributor. Replacement procedure 1. Unscrew the probe head and electrolyte container from the probe handle and discard. 2.
Battery Replacement The low battery indication LBT appears on the LCD when the battery runs low. To replace the battery: 1. Remove the meter's rubber protective cover to access the rear battery compartment. 2. Remove the battery compartment cover using a small coin or screwdriver and remove the 9V battery. 3. Replace the 9V battery and reinstall the cover and holster.
