Oakton WD-35411-01 - CON 700 Meter with Probe, Stand, and NIST-Traceable Calibration

CON 700 meter reads 0 to 199.9 mS across five ranges-autoranging feature automatically gives the best resolution for your measurements. Calibrate at up to five conductivity points (one per range) for improved measurement accuracy. Adjustable temperature coefficient provides additional accuracy. Cell constant is selectable for very high or low range measurements - meter is flexible to your application. Selectable manual or automatic temperature compensation gives greater precision.

Meter is encased in a compact 6-1/8" L x 6-7/8" W x 2-3/4" housing which takes up a minimum of bench space. Water-resistant membrane keypad and convenient pullout reference guide provide useful features for the lab. Large dual display shows conductivity or TDS and temperature and has a “ready” indicator and HOLD function.
 

Keypad Functions

LCD Annunciators

Meter Connections

• CON/ Temp
  • 8-pin DIN connection for 2-cell Con/TDS/Temp electrode

• DC
  • Power supply

ELECTRODE INFORMATION

The protective probe guard can be removed temporarily for cleaning however it must be re-attached during measurement and calibration. Erroneous results will occur while the probe guard is removed.

Always immerse the probe beyond upper steel band for best results. Use the fill line on the outside of the probe guard for reference.
 

CALIBRATION

Automatic or Manual Calibration

The CON 700 is capable of automatic or manual calibration for conductivity, and manual calibration for TDS.

In the automatic calibration mode, the meter will automatically select one of (4) conductivity calibration standard values depending on the range and normalization temperature being used (TABLE 1).

If you only use calibration standards that are listed in TABLE 1, automatic calibration is recommended. If you intend to calibrate with one or more standards that are not listed in TABLE 1, the CON 700 must be set for manual calibration instead.

The factory default is automatic conductivity calibration. See Section 6.10 to change this setting. There is no automatic calibration value available for conductivity range 1.
 

Single or Multi-Point Calibration

Use Single-Point Calibration to apply a single calibration value across all ranges.

Use Multi-Point Calibration for individual calibration in each range. This will restrict an individual calibration so that it is applied to one range only. When using multi-point calibration, perform a calibration in each range that you expect to use for best results.

The factory default is Single-Point Calibration. See Section 6.11 to change this setting.

General Calibration Tips

For best results, periodic calibration with known accurate standards is recommended. A maximum of one calibration point per range can be performed. If multiple calibration points are used in the same range, the most recent one will replace the previous one.

When the electrode is replaced, it is best to clear the calibration to the factory default values.

Rinse or immerse the probe before calibration and between samples with clean water (deionized water is ideal).

The CON 700 has non-volatile memory which will retain all calibration values, as well as meter settings and memory values upon meter shut down or unexpected power loss.

To protect from erroneous calibrations, the allowable tolerance is ±40% of the factory default value.

Low conductivity standard solutions (less than 20 µS) are unstable and are very temperature dependent. As a result, reproducible calibration results are challenging in lowest measurement range #1 (0.00 to 20.0 µS).

Automatic Conductivity Calibration Procedure

1. Press as needed to select conductivity (µS or mS).
2. Dip the electrode into the conductivity standard and press . Provide stirring for best results.
3. The primary display will show the factory default value, while the secondary display will lock on the appropriate automatic standard value from TABLE 1.
4. When the READY indicator appears, press to accept. The primary reading will flash briefly before returning to measurement mode upon successful calibration.

Manual Conductivity & TDS Calibration Procedure

1. Press as needed to select conductivity (µS or mS) or TDS (ppm or ppt) calibration.
2. Dip the electrode into the calibration standard and press . Provide stirring for best results.
3. The primary display will show the current reading, while the secondary display will be the factory default value. Adjust the temperature reading using or . Press to accept. The primary reading will flash briefly before returning to measurement mode upon successful calibration.

Temperature Calibration

The thermistor sensor used for automatic temperature compensation and measurement is accurate and stable, so frequent calibration isn’t required. Temperature calibration is recommended upon probe replacement, whenever the temperature reading is suspect, or if matching against a certified thermometer is desired.

1. Place the probe into a solution with a known accurate temperature such as a constant temperature bath.
2. Press followed by . The primary display shows the measured temperature while the secondary display shows the factory default temperature.
3. Adjust the temperature using or . Press to accept or to cancel. The meter allows an adjustable maximum value of ± 5 º C (or ± 0.9 º F) from the factory default temperature.