Hach-Lange H170 User Manual - Manual (Page 14)

Operation Function
TDS units Use the arrow keys to set the TDS units to mg/L (gal/L)
or ppm (ppt).
Salinity units in ppm (ppt) or % Use the arrow keys to set the salinity units to ppm (ppt)
or as a percentage.
1 Conductivity varies a lot with temperature. The conductivity automatic temperature compensation (ATC)
adjusts conductivity measurements to calculate the conductivity changes in the reading that are caused by
temperature. The readings are referenced to or "normalized" at a standard temperature. The ATC gives the
equivalent conductivity or TDS of a solution normalized at 20 or 25 °C.
4. Push ENTER to keep the changes and go back to setup mode.
Note: To exit and not keep the changes, push SETUP.
Calibrate for conductivity and TDS measurement
Calibrate the meter with up to five calibration points with conductivity or TDS standards. If the
calibration point is 20% larger than a calibration point in storage, both conductivity points are kept. If
the calibration point is 20% smaller than a calibration point in storage, only the new calibration point
is kept. If there are five calibration points in storage, the new calibration data replaces values near
the same range.
By default, the meter uses the temperature coefficient of 2% per °C. The user can set the coefficient
in setup mode. Review calibration points in setup mode.
Note: Salinity measurements are identified from conductivity.
1. Set the power to on.
2. Push COND or TDS.
3. Put the probe in the first standard solution. The meter measures the standard.
4. Use the arrow keys to select the value of the conductivity or TDS standard.
5. Push ENTER. The main display shows, then the "WAit" icon flashes.
Note: Push TDS or COND to stop calibration. The meter stops the current calibration and keeps the previous
calibration data.
6. Push CAL. The main value flashes.
7. To erase all previous calibration points, slopes and offset values, push CAL, then DELETE.
Ignore this step to update a previous calibration with a single point calibration.
8. Push COND or TDS to read the conductivity or TDS value of any solution.
9. Do steps
2 through 9 again to complete multiple calibration points (maximum of 5).
10. When the calibration is complete, the meter shows the slope as compared to the nominal
sensitivity for a probe of that cell constant and the total number of conductivity and TDS
calibration points in the meter.
Note: The number at the bottom right corner of the display is the calibration points that are in the meter. The
value above the slope is the slope relative to the nominal sensitivity.
Maintenance
Replace the batteries
The screen reads "bAt" when the batteries are too low to give a reliable measurement. The low
battery icon shows when there is approximately 25 hours of battery power. Measurement errors are
possible when the batteries are low. Refer to
Install the batteries on page 7 to replace the batteries.
Clean the instrument
Clean the exterior of the instrument with a moist cloth and a mild soap solution and then wipe the
instrument dry.
14 English