407303 Datasheet, PDF (5/6 Pages) Extech Instruments Corporation. – Heavy Duty Conductivity / Temperature

Data Hold
To freeze the LCD display, press the HOLD button. The 'DH' display icon will appear on
the LCD when the meter is in the Data Hold mode. Press HOLD again to return to normal
operation (the 'DH' icon will switch off).
MIN/MAX/AVG Record/Recall Mode
1. To begin capturing the Minimum (MIN), Maximum (MAX), and Average (AVG)
Conductivity and Temperature values, press the RECORD button (REC will appear on
the LCD).
2. To recall the MAX reading press the RECALL button. The MAX display icon will appear
and the measurement display areas will indicate the highest reading encountered since
the RECORD button was pressed.
3. Press the RECALL button again to view the MIN reading.
4. Press the RECALL button again to view the AVG reading.
5. Press the RECORD button to exit and return to normal operation. The REC, MAX,
MIN, and AVG icons should be off when the meter has exited the MIN/MAX/AVG
Record/Recall mode.
Conductivity Calibration
1. Keep the battery connected to the meter, but remove it
from the battery compartment..
2. Prepare a standard conductivity solution of one or all of
the following: 200uS, 2.000mS and 20.00mS.
3. Place the probe into the calibration solution and adjust
the corresponding potentiometer in the battery
compartment until the meter reads the value of the
standard solution. Other VR potentiometers located in
the battery compartment should not be adjusted.
VR3 200uS
VR4 2.000mS
VR6 20.00mS
Sensor Care
Sensor Storage
On sheathed cells, replace the sheath when storing. For non-sheathed versions, soak the
sensor tip in de-ionized water in storage.
Sensor Cleaning
After each use, the sensor tip should be rinsed with de-ionized water. If solids build up
inside the sensor, carefully remove them with a cotton swab soaked in solvent. However,
do not touch the metal parts inside the sensor.
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407303 V3.1 01/06