Differential Ph Measurement - Thermo Scientific Scientific AquaSensors DataStick User Manual

The AquaComm™ menu system is used in this document to fully describe sensor calibration and configuration features.
AquaComm™ user interface software can be loaded into most desktop, laptop and hand-held computers. Multiple instances of this
program may be opened when more than one sensor is connected through multiple communications ports or multiple station numbers.
The measurement, configuration and calibration features described here are also easily loaded into PLC's and other industrial computers.
Please refer to the individual protocol user guides for details.
Information displayed in the AquaComm™ measure screen includes sensor value, sensor units, temperature value, temperature units,
serial number, sensor type and data logging status.
Configuration and calibration pull-down menus are used to access all functions necessary to configure and calibrate sensor heads.
Data logging functions must be turned off during this process by accessing the FILE pull-down menu and turning off log files. Display
selections automatically change when a new sensor head is installed.
Once a DataStick has been configured for the desired units of measure, data filters and calibration standards, sensor head calibrations
can be performed at any time.
Measurement accuracy is maintained when transferring the sensor head from one DataStick to another. This makes it possible to set up
a DataStick system in the laboratory for calibration and test purposes. Sensor heads can then be carried to the field site and exchanged
with heads that need recalibration or refurbishment. This process reduces down time and actually extends the life of the sensor. Normal
field calibrations can be done through the AquaComm™ interface in local interface boxes.
4.1

Differential pH Measurement

The pH sensor head has a number of physical features that should be noted. The connector is keyed so it can only be inserted one
way into the DataStick. The key provides protection for the pins during installation. To insure that pins remain free of moisture and dirt,
a rubber boot is supplied with replacement sensor heads and should be kept in place when the sensor is being transferred or placed
in storage. In very humid or dirty environments, we also recommend applying some electrical grease to the connector pins.
Keep the O-Ring
Connector Key
and the shaft
of the sensor free
of dirt. Be sure
the DataStick
Gold Pins
cavity is also free
of dirt and moisture
prior to insertion.
Encapsulated
Product Number/
Serial Number
Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
O-Ring
Water tight seal.
Removable
Salt Bridge
(Other bridge profiles, materials
and salt formulas available).
Retaining Ring
Locks the sensor head
into the DataStick body.
pH Glass electrode
inside concentric
ground rod
Quad-Junction
Allows ion exchange
to reference chamber.
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