Rev: 01
P/N: 95343
Page | 26
4.2 Specific Conductance, Salinity, and TDS
4.2.1 Specific Conductance Temperature Correction
Temperature correction of conductivity to produce specific conductance is based on the temperature correction
formulas and factors of Table 3 in ISO 7888-1985 Water Quality Determination of Electrical Conductivity. This
temperature correction is normalized to 25C Because total dissolved solids (TDS) is calculated from the specific
conductance reading, it also has the above correction.
4.2.2 Salinity Calculation
The method used to calculate salinity from conductivity is found in 2520B the 19th Edition of Standard Methods
for the Examination of Water and Wastewater. This method is also commonly referred to at the Practical Salinity
Scale or UNESCO method. This method uses conductivity, not specific conductance, and includes its own
temperature correction normalized to 15C.
4.2.3 Total Disolved Salts (TDS) Calculation
TDS is calculated from specific conductance as: TDS = C x Scale Factor where TDS is total dissolved solids in g/L, C
is specific conductance in mS/cm, and Scale Factor is a user defined. The default scale factor is 0.64 from Water
Chemistry, by Snoeyink and Jenkins.
4.3 CE Testing and Certification
The MP25 System has been tested and complies with CE requirements in effect at time of manufacture. A copy
of the MP25's current Certificate of Compliance is available on request.
4.4 Turbidity
QED's MP25T is compliant with GLI method 2 EPA approved method, and ISO 7027:1999(E). GLI Method 2 is
recognized by EPAas an approved method in Section 141.74 of the Federal register Vol. 59 No. 232 (December 5,
1994). Reprints of both the GLI Method 2 documentation and the Federal Register reference are available on
request. The MPs0DT's turbidity software, and Quick-Cal Cubes™ were developed as a joint venture between
Hydrolab Corporation and GLI International, Inc. and are protected by U.S. Patents #5,059,811 and #5,140,168.
Other patents pending.
5
.
Troubleshooting
1.
The Bluetooth and Auxiliary Battery Box will not turn on.
a.
Connect the Auxiliary Battery charger provided in the kit to the nine pin RS-232 port of the
Bluetooth and Auxiliary Battery box, then plug into a 110V outlet and allow to charge.
2.
The tablet will not show readings.
a.
Try to reconnect the sonde. Turn off, then turn back on the Bluetooth Auxiliary Battery Box and
re-open the MicroPurge app to reconnect the sonde to the application.
3.
Measurements seem wrong.
a.
Recalibrate the sensors.
4.
PurgeScan Stabilization not signaled as expected.
a.
Stabilization criteria may be too stringent.
