Cyclops Submersible Sensor
998-2100
Rev. 2.9
Page 9
3.2.2 Static Gain Control
If integrating into a multi parameter system or data logger that is set up
for “Static Gain Control”, which refers to the use of only one gain setting
at a time, then you must determine which gain to use prior to deployment
(see section 3.2.1) and have an integration cable made to activate that
specific gain
(see Appendix C)
. For most applications the X10 gain will
provide the best sensitivity, range, and resolution.
Customers wanting to dynamically change the gain ranges to achieve
the optimum operating range should refer to “Method 2 – Dynamic Gain
Control” in
Appendix E
on how to interface with a Data Collection System
with programmable outputs.
3.2.3 Auto Gaining
Certain data loggers or multi parameter systems will have an auto
gaining feature which will automatically adjust the sensitivity according to
the voltage output from the Cyclops sensor. This feature maximizes the
performance of Cyclops sensors allowing users to detect a broad range
of concentrations, obtain the best resolution, and read minimum
detection limits without having to rewire or manually change the sensor’s
sensitivity. Turner Designs manufactures the DataBank Handheld Data
Logger
(see Appendix H)
which has the auto gain feature and other
functions that maximize the performance of Cyclops sensors.
3.3 Direct Concentration Calibration
Calibrating the Cyclops is a simple process requiring the use of calibration
standards. The Cyclops can be calibrated using a single calibration standard
which correlates the standard’s known concentration to the voltage measured
for that specific standard:
1) Connect the Cyclops to a power source and set the Cyclops to a gain setting
(see section 3.2.1 for explanation on how to determine gain)
2) Measure the voltage from a blank sample for the configured gain setting.
Note: A good blank to use for this application is ultra pure or
deionized water.
3) Use a standard of known concentration and create a correlation between the
standard’s concentration and the sensor’s voltage response.
