Meter Description; Calibration - Extech Instruments 407510 User Manual

Meter Description

1 LCD Display
2 POWER ON/OFF key
3 Data HOLD key
4 °C/°F selection key
5 LCD Contrast Adjust
6 RECORD key
7 RECALL key
8 Factor adjust key
9 Probe top
10 Sensor body
11 Sensor plug
12 Sensor jack
13 RS-232 output jack
14 Battery cover (rear)
15 Altitude compensation key
16 DO/O key
2
17 Zero key
18 O calibration key
2
19 % Salt key

Calibration

For first time use or after long periods (several days) of non-use, calibrate the instrument using
the following steps. The procedure should be performed in an open, well-ventilated area.
1. Ensure that the sensor is DISCONNECTED from the meter.
2. Turn ON the meter.
3. Slide the O
4. Press the zero key to null the meter (the display should indicate "OO").
5. Connect the DO sensor to the top of the meter.
6. Allow the meter to stand for at least five minutes until the display stabilizes.
7. Press the O
/DO selector to the O
2
Cal key and the display will indicate approx. 20.9 (typical O
2
position.
2
3 Model 407510
in air).
2
Ver. 2.1 May 2003